diff --git a/.gitea/workflows/secrets-bundle-release.yml b/.gitea/workflows/secrets-bundle-release.yml
new file mode 100644
index 000000000..1517699f4
--- /dev/null
+++ b/.gitea/workflows/secrets-bundle-release.yml
@@ -0,0 +1,503 @@
+# .gitea/workflows/secrets-bundle-release.yml
+# Sprint: SPRINT_20260104_005_AIRGAP (Secret Offline Kit Integration)
+# Task: OKS-007 - Add bundle to release workflow
+# Description: Build, sign, and release secrets rule bundles for offline deployment
+
+name: Secrets Bundle Release
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Bundle version (CalVer YYYY.MM format)'
+        required: true
+        type: string
+      include_in_offline_kit:
+        description: 'Include bundle in offline kit'
+        type: boolean
+        default: true
+      sign_bundle:
+        description: 'Sign bundle with DSSE'
+        type: boolean
+        default: true
+      dry_run:
+        description: 'Dry run (build but do not publish)'
+        type: boolean
+        default: false
+  push:
+    branches: [main]
+    paths:
+      - 'offline/rules/secrets/sources/**'
+      - '.gitea/workflows/secrets-bundle-release.yml'
+  pull_request:
+    branches: [main, develop]
+    paths:
+      - 'offline/rules/secrets/sources/**'
+
+env:
+  BUNDLE_ID: secrets.ruleset
+  DOTNET_NOLOGO: 1
+  DOTNET_CLI_TELEMETRY_OPTOUT: 1
+  REGISTRY: git.stella-ops.org
+
+jobs:
+  # ===========================================================================
+  # VALIDATE VERSION
+  # ===========================================================================
+
+  validate:
+    name: Validate Inputs
+    runs-on: ubuntu-22.04
+    outputs:
+      version: ${{ steps.resolve.outputs.version }}
+      sign_bundle: ${{ steps.resolve.outputs.sign_bundle }}
+      dry_run: ${{ steps.resolve.outputs.dry_run }}
+      include_in_kit: ${{ steps.resolve.outputs.include_in_kit }}
+    steps:
+      - name: Resolve inputs
+        id: resolve
+        run: |
+          if [[ "${{ github.event_name }}" == "workflow_dispatch" ]]; then
+            VERSION="${{ github.event.inputs.version }}"
+            SIGN_BUNDLE="${{ github.event.inputs.sign_bundle }}"
+            DRY_RUN="${{ github.event.inputs.dry_run }}"
+            INCLUDE_IN_KIT="${{ github.event.inputs.include_in_offline_kit }}"
+          else
+            # Auto-generate version for push/PR builds
+            VERSION="$(date +%Y.%m)"
+            SIGN_BUNDLE="false"  # Don't sign non-release builds
+            DRY_RUN="true"
+            INCLUDE_IN_KIT="false"
+          fi
+
+          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
+          echo "sign_bundle=$SIGN_BUNDLE" >> "$GITHUB_OUTPUT"
+          echo "dry_run=$DRY_RUN" >> "$GITHUB_OUTPUT"
+          echo "include_in_kit=$INCLUDE_IN_KIT" >> "$GITHUB_OUTPUT"
+
+          echo "=== Bundle Configuration ==="
+          echo "Version: $VERSION"
+          echo "Sign Bundle: $SIGN_BUNDLE"
+          echo "Dry Run: $DRY_RUN"
+          echo "Include in Kit: $INCLUDE_IN_KIT"
+
+      - name: Validate version format
+        run: |
+          VERSION="${{ steps.resolve.outputs.version }}"
+          if ! [[ "$VERSION" =~ ^[0-9]{4}\.[0-9]{2}$ ]]; then
+            echo "::error::Invalid version format. Expected CalVer YYYY.MM (e.g., 2026.01)"
+            exit 1
+          fi
+
+  # ===========================================================================
+  # BUILD BUNDLE
+  # ===========================================================================
+
+  build-bundle:
+    name: Build Secrets Bundle
+    runs-on: ubuntu-22.04
+    needs: [validate]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup directories
+        run: |
+          VERSION="${{ needs.validate.outputs.version }}"
+          mkdir -p "out/bundles/secrets/${VERSION}"
+          mkdir -p "offline/rules/secrets/${VERSION}"
+
+      - name: Collect rule sources
+        run: |
+          VERSION="${{ needs.validate.outputs.version }}"
+          BUNDLE_DIR="out/bundles/secrets/${VERSION}"
+          SOURCE_DIR="offline/rules/secrets/sources"
+
+          if [[ ! -d "$SOURCE_DIR" ]]; then
+            echo "Creating sample rule source directory..."
+            mkdir -p "$SOURCE_DIR"
+
+            # Create minimal placeholder if no sources exist
+            cat > "${SOURCE_DIR}/placeholder.json" << 'EOF'
+          {
+            "id": "placeholder-rule",
+            "name": "Placeholder Rule",
+            "description": "This is a placeholder rule. Add actual rules to offline/rules/secrets/sources/",
+            "pattern": "^PLACEHOLDER_",
+            "severity": "low",
+            "confidence": 0.1
+          }
+          EOF
+          fi
+
+          RULE_COUNT=$(find "$SOURCE_DIR" -name "*.json" | wc -l)
+          echo "Found ${RULE_COUNT} rule source files"
+
+      - name: Build rule bundle
+        run: |
+          VERSION="${{ needs.validate.outputs.version }}"
+          BUNDLE_DIR="out/bundles/secrets/${VERSION}"
+          SOURCE_DIR="offline/rules/secrets/sources"
+          BUNDLE_ID="${{ env.BUNDLE_ID }}"
+
+          # Compile rules to JSONL format
+          echo "Compiling rules to JSONL..."
+          RULE_COUNT=0
+          > "${BUNDLE_DIR}/${BUNDLE_ID}.rules.jsonl"
+
+          for rule_file in "${SOURCE_DIR}"/*.json; do
+            if [[ -f "$rule_file" ]]; then
+              # Validate JSON and add to bundle
+              if jq -e '.' "$rule_file" > /dev/null 2>&1; then
+                jq -c '.' "$rule_file" >> "${BUNDLE_DIR}/${BUNDLE_ID}.rules.jsonl"
+                RULE_COUNT=$((RULE_COUNT + 1))
+              else
+                echo "::warning::Invalid JSON in $rule_file, skipping"
+              fi
+            fi
+          done
+
+          echo "Compiled ${RULE_COUNT} rules"
+
+          # Compute file digests
+          RULES_DIGEST=$(sha256sum "${BUNDLE_DIR}/${BUNDLE_ID}.rules.jsonl" | cut -d' ' -f1)
+          RULES_SIZE=$(stat -f%z "${BUNDLE_DIR}/${BUNDLE_ID}.rules.jsonl" 2>/dev/null || stat -c%s "${BUNDLE_DIR}/${BUNDLE_ID}.rules.jsonl")
+
+          # Generate manifest
+          cat > "${BUNDLE_DIR}/${BUNDLE_ID}.manifest.json" << EOF
+          {
+            "bundleId": "${BUNDLE_ID}",
+            "bundleType": "secrets",
+            "version": "${VERSION}",
+            "ruleCount": ${RULE_COUNT},
+            "createdAt": "$(date -u +%Y-%m-%dT%H:%M:%SZ)",
+            "gitSha": "${{ github.sha }}",
+            "gitRef": "${{ github.ref }}",
+            "files": [
+              {
+                "name": "${BUNDLE_ID}.rules.jsonl",
+                "digest": "sha256:${RULES_DIGEST}",
+                "sizeBytes": ${RULES_SIZE}
+              }
+            ]
+          }
+          EOF
+
+          echo "=== Bundle Manifest ==="
+          cat "${BUNDLE_DIR}/${BUNDLE_ID}.manifest.json"
+
+      - name: Upload unsigned bundle
+        uses: actions/upload-artifact@v4
+        with:
+          name: secrets-bundle-unsigned-${{ needs.validate.outputs.version }}
+          path: out/bundles/secrets/${{ needs.validate.outputs.version }}
+          retention-days: 30
+
+  # ===========================================================================
+  # SIGN BUNDLE
+  # ===========================================================================
+
+  sign-bundle:
+    name: Sign Secrets Bundle
+    runs-on: ubuntu-22.04
+    needs: [validate, build-bundle]
+    if: needs.validate.outputs.sign_bundle == 'true'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Download unsigned bundle
+        uses: actions/download-artifact@v4
+        with:
+          name: secrets-bundle-unsigned-${{ needs.validate.outputs.version }}
+          path: bundle
+
+      - name: Sign bundle with DSSE
+        env:
+          SECRETS_SIGNER_KEY: ${{ secrets.SECRETS_SIGNER_KEY }}
+          SECRETS_SIGNER_KEY_ID: ${{ secrets.SECRETS_SIGNER_KEY_ID }}
+        run: |
+          VERSION="${{ needs.validate.outputs.version }}"
+          BUNDLE_ID="${{ env.BUNDLE_ID }}"
+          MANIFEST_PATH="bundle/${BUNDLE_ID}.manifest.json"
+
+          if [[ -z "${SECRETS_SIGNER_KEY}" ]]; then
+            echo "::warning::SECRETS_SIGNER_KEY not configured, generating test signature"
+
+            # Generate a test DSSE envelope (not cryptographically valid)
+            PAYLOAD_B64=$(base64 -w0 "${MANIFEST_PATH}")
+
+            cat > "bundle/${BUNDLE_ID}.dsse.json" << EOF
+          {
+            "payloadType": "application/vnd.stellaops.rulebundle.manifest+json",
+            "payload": "${PAYLOAD_B64}",
+            "signatures": [
+              {
+                "keyid": "test-key-unsigned",
+                "sig": "$(echo 'unsigned-test-signature' | base64 -w0)"
+              }
+            ]
+          }
+          EOF
+
+            # Update manifest to indicate test signing
+            jq '.signerKeyId = "test-key-unsigned" | .signedAt = "'"$(date -u +%Y-%m-%dT%H:%M:%SZ)"'"' \
+              "${MANIFEST_PATH}" > "${MANIFEST_PATH}.tmp" && mv "${MANIFEST_PATH}.tmp" "${MANIFEST_PATH}"
+          else
+            # Real DSSE signing
+            echo "Signing bundle with key: ${SECRETS_SIGNER_KEY_ID}"
+
+            # Create PAE (Pre-Authentication Encoding)
+            PAYLOAD_TYPE="application/vnd.stellaops.rulebundle.manifest+json"
+            PAYLOAD=$(cat "${MANIFEST_PATH}")
+            PAYLOAD_B64=$(echo -n "$PAYLOAD" | base64 -w0)
+
+            PAE="DSSEv1 ${#PAYLOAD_TYPE} ${PAYLOAD_TYPE} ${#PAYLOAD} ${PAYLOAD}"
+
+            # Sign using openssl (ES256)
+            echo "${SECRETS_SIGNER_KEY}" | base64 -d > /tmp/signing-key.pem
+            SIG=$(echo -n "$PAE" | openssl dgst -sha256 -sign /tmp/signing-key.pem | base64 -w0)
+            rm -f /tmp/signing-key.pem
+
+            cat > "bundle/${BUNDLE_ID}.dsse.json" << EOF
+          {
+            "payloadType": "${PAYLOAD_TYPE}",
+            "payload": "${PAYLOAD_B64}",
+            "signatures": [
+              {
+                "keyid": "${SECRETS_SIGNER_KEY_ID}",
+                "sig": "${SIG}"
+              }
+            ]
+          }
+          EOF
+
+            # Update manifest with signing info
+            jq '.signerKeyId = "'"${SECRETS_SIGNER_KEY_ID}"'" | .signedAt = "'"$(date -u +%Y-%m-%dT%H:%M:%SZ)"'"' \
+              "${MANIFEST_PATH}" > "${MANIFEST_PATH}.tmp" && mv "${MANIFEST_PATH}.tmp" "${MANIFEST_PATH}"
+          fi
+
+          echo "=== DSSE Envelope ==="
+          jq '.' "bundle/${BUNDLE_ID}.dsse.json"
+
+      - name: Verify signature structure
+        run: |
+          BUNDLE_ID="${{ env.BUNDLE_ID }}"
+
+          # Verify DSSE structure
+          jq -e '.payloadType and .payload and .signatures[0].keyid and .signatures[0].sig' \
+            "bundle/${BUNDLE_ID}.dsse.json" > /dev/null
+
+          echo "Signature structure verified"
+
+      - name: Upload signed bundle
+        uses: actions/upload-artifact@v4
+        with:
+          name: secrets-bundle-signed-${{ needs.validate.outputs.version }}
+          path: bundle
+          retention-days: 90
+
+  # ===========================================================================
+  # PACKAGE FOR OFFLINE KIT
+  # ===========================================================================
+
+  package-offline-kit:
+    name: Package for Offline Kit
+    runs-on: ubuntu-22.04
+    needs: [validate, build-bundle, sign-bundle]
+    if: always() && needs.build-bundle.result == 'success' && needs.validate.outputs.include_in_kit == 'true'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Download bundle
+        uses: actions/download-artifact@v4
+        with:
+          name: ${{ needs.sign-bundle.result == 'success' && format('secrets-bundle-signed-{0}', needs.validate.outputs.version) || format('secrets-bundle-unsigned-{0}', needs.validate.outputs.version) }}
+          path: bundle
+
+      - name: Package bundle
+        run: |
+          VERSION="${{ needs.validate.outputs.version }}"
+          BUNDLE_ID="${{ env.BUNDLE_ID }}"
+
+          # Create offline kit structure
+          mkdir -p "offline-kit/rules/secrets/${VERSION}"
+          cp bundle/* "offline-kit/rules/secrets/${VERSION}/"
+
+          # Create symlink for latest
+          cd "offline-kit/rules/secrets"
+          ln -sf "${VERSION}" latest
+
+          # Generate checksums
+          cd "${VERSION}"
+          sha256sum ${BUNDLE_ID}.* > SHA256SUMS
+
+          echo "=== Offline Kit Contents ==="
+          find ../.. -type f | head -20
+
+      - name: Create tarball
+        run: |
+          VERSION="${{ needs.validate.outputs.version }}"
+          cd offline-kit
+          tar -czvf "../secrets-bundle-kit-${VERSION}.tar.gz" .
+
+      - name: Upload offline kit package
+        uses: actions/upload-artifact@v4
+        with:
+          name: secrets-bundle-kit-${{ needs.validate.outputs.version }}
+          path: secrets-bundle-kit-*.tar.gz
+          retention-days: 90
+
+  # ===========================================================================
+  # PUBLISH
+  # ===========================================================================
+
+  publish:
+    name: Publish Bundle
+    runs-on: ubuntu-22.04
+    needs: [validate, sign-bundle, package-offline-kit]
+    if: needs.validate.outputs.dry_run != 'true' && needs.sign-bundle.result == 'success'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Download signed bundle
+        uses: actions/download-artifact@v4
+        with:
+          name: secrets-bundle-signed-${{ needs.validate.outputs.version }}
+          path: bundle
+
+      - name: Download offline kit package
+        uses: actions/download-artifact@v4
+        with:
+          name: secrets-bundle-kit-${{ needs.validate.outputs.version }}
+          path: kit
+        continue-on-error: true
+
+      - name: Commit bundle to repository
+        run: |
+          VERSION="${{ needs.validate.outputs.version }}"
+          BUNDLE_ID="${{ env.BUNDLE_ID }}"
+          TARGET_DIR="offline/rules/secrets/${VERSION}"
+
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+
+          mkdir -p "${TARGET_DIR}"
+          cp bundle/* "${TARGET_DIR}/"
+
+          # Update latest symlink
+          cd offline/rules/secrets
+          rm -f latest
+          ln -sf "${VERSION}" latest
+          cd -
+
+          git add "offline/rules/secrets/${VERSION}"
+          git add "offline/rules/secrets/latest"
+
+          if git diff --cached --quiet; then
+            echo "No changes to commit"
+          else
+            git commit -m "release: secrets rule bundle ${VERSION}
+
+          Bundle ID: ${BUNDLE_ID}
+          Version: ${VERSION}
+          Git SHA: ${{ github.sha }}
+
+          🤖 Generated with [Claude Code](https://claude.ai/claude-code)
+
+          Co-Authored-By: github-actions[bot] <github-actions[bot]@users.noreply.github.com>"
+
+            git push
+          fi
+
+      - name: Create release tag
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITEA_TOKEN }}
+        run: |
+          VERSION="${{ needs.validate.outputs.version }}"
+          BUNDLE_ID="${{ env.BUNDLE_ID }}"
+
+          # Get rule count from manifest
+          RULE_COUNT=$(jq -r '.ruleCount // 0' "bundle/${BUNDLE_ID}.manifest.json")
+          SIGNER_KEY_ID=$(jq -r '.signerKeyId // "unknown"' "bundle/${BUNDLE_ID}.manifest.json")
+
+          # Create release notes
+          cat > release-notes.md << EOF
+          ## Secrets Rule Bundle ${VERSION}
+
+          ### Bundle Information
+          - **Bundle ID:** ${BUNDLE_ID}
+          - **Version:** ${VERSION}
+          - **Rule Count:** ${RULE_COUNT}
+          - **Signer Key ID:** ${SIGNER_KEY_ID}
+          - **Git SHA:** ${{ github.sha }}
+
+          ### Installation
+
+          #### For Online Environments
+          \`\`\`bash
+          stella secrets bundle update --version ${VERSION}
+          \`\`\`
+
+          #### For Offline/Air-Gapped Environments
+          1. Download the offline kit package
+          2. Transfer to air-gapped environment
+          3. Run the installation script:
+             \`\`\`bash
+             ./devops/offline/scripts/install-secrets-bundle.sh /path/to/rules/secrets/${VERSION}
+             \`\`\`
+
+          ### Files
+          | File | Description |
+          |------|-------------|
+          | \`${BUNDLE_ID}.manifest.json\` | Bundle manifest with metadata |
+          | \`${BUNDLE_ID}.rules.jsonl\` | Rule definitions (JSONL format) |
+          | \`${BUNDLE_ID}.dsse.json\` | DSSE signature envelope |
+          EOF
+
+          # Prepare assets
+          mkdir -p release-assets
+          cp bundle/* release-assets/
+          if [[ -f "kit/secrets-bundle-kit-${VERSION}.tar.gz" ]]; then
+            cp "kit/secrets-bundle-kit-${VERSION}.tar.gz" release-assets/
+          fi
+
+          # Create release
+          gh release create "secrets-bundle-${VERSION}" \
+            --title "Secrets Rule Bundle ${VERSION}" \
+            --notes-file release-notes.md \
+            release-assets/*
+
+  # ===========================================================================
+  # SUMMARY
+  # ===========================================================================
+
+  summary:
+    name: Build Summary
+    runs-on: ubuntu-22.04
+    needs: [validate, build-bundle, sign-bundle, package-offline-kit, publish]
+    if: always()
+    steps:
+      - name: Generate Summary
+        run: |
+          echo "## Secrets Bundle Release Summary" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "### Configuration" >> $GITHUB_STEP_SUMMARY
+          echo "| Property | Value |" >> $GITHUB_STEP_SUMMARY
+          echo "|----------|-------|" >> $GITHUB_STEP_SUMMARY
+          echo "| Version | ${{ needs.validate.outputs.version }} |" >> $GITHUB_STEP_SUMMARY
+          echo "| Sign Bundle | ${{ needs.validate.outputs.sign_bundle }} |" >> $GITHUB_STEP_SUMMARY
+          echo "| Dry Run | ${{ needs.validate.outputs.dry_run }} |" >> $GITHUB_STEP_SUMMARY
+          echo "| Include in Kit | ${{ needs.validate.outputs.include_in_kit }} |" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "### Job Results" >> $GITHUB_STEP_SUMMARY
+          echo "| Job | Status |" >> $GITHUB_STEP_SUMMARY
+          echo "|-----|--------|" >> $GITHUB_STEP_SUMMARY
+          echo "| Build Bundle | ${{ needs.build-bundle.result }} |" >> $GITHUB_STEP_SUMMARY
+          echo "| Sign Bundle | ${{ needs.sign-bundle.result || 'skipped' }} |" >> $GITHUB_STEP_SUMMARY
+          echo "| Package Offline Kit | ${{ needs.package-offline-kit.result || 'skipped' }} |" >> $GITHUB_STEP_SUMMARY
+          echo "| Publish | ${{ needs.publish.result || 'skipped' }} |" >> $GITHUB_STEP_SUMMARY
diff --git a/devops/helm/stellaops/values-airgap.yaml b/devops/helm/stellaops/values-airgap.yaml
index 03ffb6f54..9b9465b78 100644
--- a/devops/helm/stellaops/values-airgap.yaml
+++ b/devops/helm/stellaops/values-airgap.yaml
@@ -184,6 +184,17 @@ services:
       SCANNER_SURFACE_CACHE_ROOT: "/var/lib/stellaops/surface"
       SCANNER_SURFACE_SECRETS_PROVIDER: "file"
       SCANNER_SURFACE_SECRETS_ROOT: "/etc/stellaops/secrets"
+      # Secret Detection Rules Bundle
+      SCANNER__FEATURES__EXPERIMENTAL__SECRETLEAKDETECTION: "false"
+      SCANNER__SECRETS__BUNDLEPATH: "/opt/stellaops/plugins/scanner/analyzers/secrets"
+      SCANNER__SECRETS__REQUIRESIGNATURE: "true"
+    volumeMounts:
+      - name: secrets-rules
+        mountPath: /opt/stellaops/plugins/scanner/analyzers/secrets
+        readOnly: true
+    volumeClaims:
+      - name: secrets-rules
+        claimName: stellaops-secrets-rules
   notify-web:
     image: registry.stella-ops.org/stellaops/notify-web:2025.09.2
     service:
diff --git a/devops/offline/scripts/install-secrets-bundle.sh b/devops/offline/scripts/install-secrets-bundle.sh
new file mode 100644
index 000000000..e29db46ef
--- /dev/null
+++ b/devops/offline/scripts/install-secrets-bundle.sh
@@ -0,0 +1,231 @@
+#!/usr/bin/env bash
+# -----------------------------------------------------------------------------
+# install-secrets-bundle.sh
+# Sprint: SPRINT_20260104_005_AIRGAP (Secret Offline Kit Integration)
+# Task: OKS-005 - Create bundle installation script
+# Description: Install signed secrets rule bundle for offline environments
+# -----------------------------------------------------------------------------
+# Usage: ./install-secrets-bundle.sh <bundle-path> [install-path] [attestor-mirror]
+# Example: ./install-secrets-bundle.sh /mnt/offline-kit/rules/secrets/2026.01
+
+set -euo pipefail
+
+# Configuration
+BUNDLE_PATH="${1:?Bundle path required (e.g., /mnt/offline-kit/rules/secrets/2026.01)}"
+INSTALL_PATH="${2:-/opt/stellaops/plugins/scanner/analyzers/secrets}"
+ATTESTOR_MIRROR="${3:-}"
+BUNDLE_ID="${BUNDLE_ID:-secrets.ruleset}"
+REQUIRE_SIGNATURE="${REQUIRE_SIGNATURE:-true}"
+STELLAOPS_USER="${STELLAOPS_USER:-stellaops}"
+STELLAOPS_GROUP="${STELLAOPS_GROUP:-stellaops}"
+
+# Color output helpers (disabled if not a terminal)
+if [[ -t 1 ]]; then
+  RED='\033[0;31m'
+  GREEN='\033[0;32m'
+  YELLOW='\033[0;33m'
+  NC='\033[0m' # No Color
+else
+  RED=''
+  GREEN=''
+  YELLOW=''
+  NC=''
+fi
+
+log_info()  { echo -e "${GREEN}==>${NC} $*"; }
+log_warn()  { echo -e "${YELLOW}WARN:${NC} $*" >&2; }
+log_error() { echo -e "${RED}ERROR:${NC} $*" >&2; }
+
+# Validate bundle path
+log_info "Validating secrets bundle at ${BUNDLE_PATH}"
+
+if [[ ! -d "${BUNDLE_PATH}" ]]; then
+  log_error "Bundle directory not found: ${BUNDLE_PATH}"
+  exit 1
+fi
+
+MANIFEST_FILE="${BUNDLE_PATH}/${BUNDLE_ID}.manifest.json"
+RULES_FILE="${BUNDLE_PATH}/${BUNDLE_ID}.rules.jsonl"
+SIGNATURE_FILE="${BUNDLE_PATH}/${BUNDLE_ID}.dsse.json"
+
+if [[ ! -f "${MANIFEST_FILE}" ]]; then
+  log_error "Manifest not found: ${MANIFEST_FILE}"
+  exit 1
+fi
+
+if [[ ! -f "${RULES_FILE}" ]]; then
+  log_error "Rules file not found: ${RULES_FILE}"
+  exit 1
+fi
+
+# Extract bundle version
+BUNDLE_VERSION=$(jq -r '.version // "unknown"' "${MANIFEST_FILE}" 2>/dev/null || echo "unknown")
+RULE_COUNT=$(jq -r '.ruleCount // 0' "${MANIFEST_FILE}" 2>/dev/null || echo "0")
+SIGNER_KEY_ID=$(jq -r '.signerKeyId // "unknown"' "${MANIFEST_FILE}" 2>/dev/null || echo "unknown")
+
+log_info "Bundle version: ${BUNDLE_VERSION}"
+log_info "Rule count: ${RULE_COUNT}"
+log_info "Signer key ID: ${SIGNER_KEY_ID}"
+
+# Verify signature if required
+if [[ "${REQUIRE_SIGNATURE}" == "true" ]]; then
+  log_info "Verifying bundle signature..."
+
+  if [[ ! -f "${SIGNATURE_FILE}" ]]; then
+    log_error "Signature file not found: ${SIGNATURE_FILE}"
+    log_error "Set REQUIRE_SIGNATURE=false to skip signature verification (not recommended)"
+    exit 1
+  fi
+
+  # Set attestor mirror URL if provided
+  if [[ -n "${ATTESTOR_MIRROR}" ]]; then
+    export STELLA_ATTESTOR_URL="file://${ATTESTOR_MIRROR}"
+    log_info "Using attestor mirror: ${STELLA_ATTESTOR_URL}"
+  fi
+
+  # Verify using stella CLI if available
+  if command -v stella &>/dev/null; then
+    if ! stella secrets bundle verify --bundle "${BUNDLE_PATH}" --bundle-id "${BUNDLE_ID}"; then
+      log_error "Bundle signature verification failed"
+      exit 1
+    fi
+    log_info "Signature verification passed"
+  else
+    log_warn "stella CLI not found, performing basic signature file check only"
+
+    # Basic check: verify signature file is valid JSON with expected structure
+    if ! jq -e '.payloadType and .payload and .signatures' "${SIGNATURE_FILE}" >/dev/null 2>&1; then
+      log_error "Invalid DSSE envelope structure in ${SIGNATURE_FILE}"
+      exit 1
+    fi
+
+    # Verify payload digest matches
+    EXPECTED_DIGEST=$(jq -r '.payload' "${SIGNATURE_FILE}" | base64 -d | sha256sum | cut -d' ' -f1)
+    ACTUAL_DIGEST=$(sha256sum "${MANIFEST_FILE}" | cut -d' ' -f1)
+
+    if [[ "${EXPECTED_DIGEST}" != "${ACTUAL_DIGEST}" ]]; then
+      log_error "Payload digest mismatch"
+      log_error "Expected: ${EXPECTED_DIGEST}"
+      log_error "Actual:   ${ACTUAL_DIGEST}"
+      exit 1
+    fi
+
+    log_warn "Basic signature structure verified (full cryptographic verification requires stella CLI)"
+  fi
+else
+  log_warn "Signature verification skipped (REQUIRE_SIGNATURE=false)"
+fi
+
+# Verify file digests listed in manifest
+log_info "Verifying file digests..."
+DIGEST_ERRORS=()
+
+while IFS= read -r file_entry; do
+  FILE_NAME=$(echo "${file_entry}" | jq -r '.name')
+  EXPECTED_DIGEST=$(echo "${file_entry}" | jq -r '.digest' | sed 's/sha256://')
+  FILE_PATH="${BUNDLE_PATH}/${FILE_NAME}"
+
+  if [[ ! -f "${FILE_PATH}" ]]; then
+    DIGEST_ERRORS+=("File missing: ${FILE_NAME}")
+    continue
+  fi
+
+  ACTUAL_DIGEST=$(sha256sum "${FILE_PATH}" | cut -d' ' -f1)
+  if [[ "${EXPECTED_DIGEST}" != "${ACTUAL_DIGEST}" ]]; then
+    DIGEST_ERRORS+=("Digest mismatch: ${FILE_NAME}")
+  fi
+done < <(jq -c '.files[]' "${MANIFEST_FILE}" 2>/dev/null)
+
+if [[ ${#DIGEST_ERRORS[@]} -gt 0 ]]; then
+  log_error "File digest verification failed:"
+  for err in "${DIGEST_ERRORS[@]}"; do
+    log_error "  - ${err}"
+  done
+  exit 1
+fi
+log_info "File digests verified"
+
+# Check existing installation
+if [[ -d "${INSTALL_PATH}" ]]; then
+  EXISTING_MANIFEST="${INSTALL_PATH}/${BUNDLE_ID}.manifest.json"
+  if [[ -f "${EXISTING_MANIFEST}" ]]; then
+    EXISTING_VERSION=$(jq -r '.version // "unknown"' "${EXISTING_MANIFEST}" 2>/dev/null || echo "unknown")
+    log_info "Existing installation found: version ${EXISTING_VERSION}"
+
+    # Version comparison (CalVer: YYYY.MM)
+    if [[ "${EXISTING_VERSION}" > "${BUNDLE_VERSION}" ]]; then
+      log_warn "Existing version (${EXISTING_VERSION}) is newer than bundle (${BUNDLE_VERSION})"
+      log_warn "Use FORCE_INSTALL=true to override"
+      if [[ "${FORCE_INSTALL:-false}" != "true" ]]; then
+        exit 1
+      fi
+    fi
+  fi
+fi
+
+# Create installation directory
+log_info "Creating installation directory: ${INSTALL_PATH}"
+mkdir -p "${INSTALL_PATH}"
+
+# Install bundle files
+log_info "Installing bundle files..."
+for file in "${BUNDLE_PATH}"/${BUNDLE_ID}.*; do
+  if [[ -f "${file}" ]]; then
+    FILE_NAME=$(basename "${file}")
+    echo "    ${FILE_NAME}"
+    cp -f "${file}" "${INSTALL_PATH}/"
+  fi
+done
+
+# Set permissions
+log_info "Setting file permissions..."
+chmod 640 "${INSTALL_PATH}"/${BUNDLE_ID}.* 2>/dev/null || true
+
+# Set ownership if running as root
+if [[ "${EUID:-$(id -u)}" -eq 0 ]]; then
+  if id "${STELLAOPS_USER}" &>/dev/null; then
+    chown "${STELLAOPS_USER}:${STELLAOPS_GROUP}" "${INSTALL_PATH}"/${BUNDLE_ID}.* 2>/dev/null || true
+    log_info "Set ownership to ${STELLAOPS_USER}:${STELLAOPS_GROUP}"
+  else
+    log_warn "User ${STELLAOPS_USER} does not exist, skipping ownership change"
+  fi
+else
+  log_info "Not running as root, skipping ownership change"
+fi
+
+# Create installation receipt
+RECEIPT_FILE="${INSTALL_PATH}/.install-receipt.json"
+cat > "${RECEIPT_FILE}" <<EOF
+{
+  "bundleId": "${BUNDLE_ID}",
+  "version": "${BUNDLE_VERSION}",
+  "ruleCount": ${RULE_COUNT},
+  "signerKeyId": "${SIGNER_KEY_ID}",
+  "installedAt": "$(date -u +%Y-%m-%dT%H:%M:%SZ)",
+  "installedFrom": "${BUNDLE_PATH}",
+  "installedBy": "${USER:-unknown}",
+  "hostname": "$(hostname -f 2>/dev/null || hostname)"
+}
+EOF
+
+# Verify installation
+INSTALLED_VERSION=$(jq -r '.version' "${INSTALL_PATH}/${BUNDLE_ID}.manifest.json" 2>/dev/null || echo "unknown")
+log_info "Successfully installed secrets bundle version ${INSTALLED_VERSION}"
+
+echo ""
+echo "Installation summary:"
+echo "  Bundle ID:      ${BUNDLE_ID}"
+echo "  Version:        ${INSTALLED_VERSION}"
+echo "  Rule count:     ${RULE_COUNT}"
+echo "  Install path:   ${INSTALL_PATH}"
+echo "  Receipt:        ${RECEIPT_FILE}"
+echo ""
+echo "Next steps:"
+echo "  1. Restart Scanner Worker to load the new bundle:"
+echo "     systemctl restart stellaops-scanner-worker"
+echo ""
+echo "  Or with Kubernetes:"
+echo "     kubectl rollout restart deployment/scanner-worker -n stellaops"
+echo ""
+echo "  2. Verify bundle is loaded:"
+echo "     kubectl logs -l app=scanner-worker --tail=100 | grep SecretsAnalyzerHost"
diff --git a/devops/offline/scripts/rotate-secrets-bundle.sh b/devops/offline/scripts/rotate-secrets-bundle.sh
new file mode 100644
index 000000000..693cb0c99
--- /dev/null
+++ b/devops/offline/scripts/rotate-secrets-bundle.sh
@@ -0,0 +1,299 @@
+#!/usr/bin/env bash
+# -----------------------------------------------------------------------------
+# rotate-secrets-bundle.sh
+# Sprint: SPRINT_20260104_005_AIRGAP (Secret Offline Kit Integration)
+# Task: OKS-006 - Add bundle rotation/upgrade workflow
+# Description: Safely rotate/upgrade secrets rule bundle with backup and rollback
+# -----------------------------------------------------------------------------
+# Usage: ./rotate-secrets-bundle.sh <new-bundle-path> [install-path]
+# Example: ./rotate-secrets-bundle.sh /mnt/offline-kit/rules/secrets/2026.02
+
+set -euo pipefail
+
+# Configuration
+NEW_BUNDLE_PATH="${1:?New bundle path required (e.g., /mnt/offline-kit/rules/secrets/2026.02)}"
+INSTALL_PATH="${2:-/opt/stellaops/plugins/scanner/analyzers/secrets}"
+BACKUP_BASE="${BACKUP_BASE:-/opt/stellaops/backups/secrets-bundles}"
+BUNDLE_ID="${BUNDLE_ID:-secrets.ruleset}"
+ATTESTOR_MIRROR="${ATTESTOR_MIRROR:-}"
+RESTART_WORKERS="${RESTART_WORKERS:-true}"
+KUBERNETES_NAMESPACE="${KUBERNETES_NAMESPACE:-stellaops}"
+KUBERNETES_DEPLOYMENT="${KUBERNETES_DEPLOYMENT:-scanner-worker}"
+MAX_BACKUPS="${MAX_BACKUPS:-5}"
+
+# Script directory for calling install script
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# Color output helpers
+if [[ -t 1 ]]; then
+  RED='\033[0;31m'
+  GREEN='\033[0;32m'
+  YELLOW='\033[0;33m'
+  BLUE='\033[0;34m'
+  NC='\033[0m'
+else
+  RED=''
+  GREEN=''
+  YELLOW=''
+  BLUE=''
+  NC=''
+fi
+
+log_info()  { echo -e "${GREEN}==>${NC} $*"; }
+log_warn()  { echo -e "${YELLOW}WARN:${NC} $*" >&2; }
+log_error() { echo -e "${RED}ERROR:${NC} $*" >&2; }
+log_step()  { echo -e "${BLUE}--->${NC} $*"; }
+
+# Error handler
+cleanup_on_error() {
+  log_error "Rotation failed! Attempting rollback..."
+  if [[ -n "${BACKUP_DIR:-}" && -d "${BACKUP_DIR}" ]]; then
+    perform_rollback "${BACKUP_DIR}"
+  fi
+}
+
+perform_rollback() {
+  local backup_dir="$1"
+  log_info "Rolling back to backup: ${backup_dir}"
+
+  if [[ ! -d "${backup_dir}" ]]; then
+    log_error "Backup directory not found: ${backup_dir}"
+    return 1
+  fi
+
+  # Restore files
+  cp -a "${backup_dir}"/* "${INSTALL_PATH}/" 2>/dev/null || {
+    log_error "Failed to restore files from backup"
+    return 1
+  }
+
+  log_info "Rollback completed"
+
+  # Restart workers after rollback
+  if [[ "${RESTART_WORKERS}" == "true" ]]; then
+    restart_workers "rollback"
+  fi
+
+  return 0
+}
+
+restart_workers() {
+  local reason="${1:-upgrade}"
+  log_info "Restarting scanner workers (${reason})..."
+
+  # Try Kubernetes first
+  if command -v kubectl &>/dev/null; then
+    if kubectl get deployment "${KUBERNETES_DEPLOYMENT}" -n "${KUBERNETES_NAMESPACE}" &>/dev/null; then
+      log_step "Performing Kubernetes rolling restart..."
+      kubectl rollout restart deployment/"${KUBERNETES_DEPLOYMENT}" -n "${KUBERNETES_NAMESPACE}"
+      log_step "Waiting for rollout to complete..."
+      kubectl rollout status deployment/"${KUBERNETES_DEPLOYMENT}" -n "${KUBERNETES_NAMESPACE}" --timeout=300s || {
+        log_warn "Rollout status check timed out (workers may still be restarting)"
+      }
+      return 0
+    fi
+  fi
+
+  # Try systemd
+  if command -v systemctl &>/dev/null; then
+    if systemctl is-active stellaops-scanner-worker &>/dev/null 2>&1; then
+      log_step "Restarting systemd service..."
+      systemctl restart stellaops-scanner-worker
+      return 0
+    fi
+  fi
+
+  log_warn "Could not auto-restart workers (no Kubernetes or systemd found)"
+  log_warn "Please restart scanner workers manually"
+}
+
+cleanup_old_backups() {
+  log_info "Cleaning up old backups (keeping last ${MAX_BACKUPS})..."
+
+  if [[ ! -d "${BACKUP_BASE}" ]]; then
+    return 0
+  fi
+
+  # List backups sorted by name (which includes timestamp)
+  local backups
+  backups=$(find "${BACKUP_BASE}" -maxdepth 1 -type d -name "20*" | sort -r)
+  local count=0
+
+  for backup in ${backups}; do
+    count=$((count + 1))
+    if [[ ${count} -gt ${MAX_BACKUPS} ]]; then
+      log_step "Removing old backup: ${backup}"
+      rm -rf "${backup}"
+    fi
+  done
+}
+
+# Main rotation logic
+main() {
+  echo ""
+  log_info "Secrets Bundle Rotation"
+  echo "========================================"
+  echo ""
+
+  # Validate new bundle
+  log_info "Step 1/6: Validating new bundle..."
+  if [[ ! -d "${NEW_BUNDLE_PATH}" ]]; then
+    log_error "New bundle directory not found: ${NEW_BUNDLE_PATH}"
+    exit 1
+  fi
+
+  NEW_MANIFEST="${NEW_BUNDLE_PATH}/${BUNDLE_ID}.manifest.json"
+  if [[ ! -f "${NEW_MANIFEST}" ]]; then
+    log_error "New bundle manifest not found: ${NEW_MANIFEST}"
+    exit 1
+  fi
+
+  NEW_VERSION=$(jq -r '.version // "unknown"' "${NEW_MANIFEST}" 2>/dev/null || echo "unknown")
+  NEW_RULE_COUNT=$(jq -r '.ruleCount // 0' "${NEW_MANIFEST}" 2>/dev/null || echo "0")
+  log_step "New version: ${NEW_VERSION} (${NEW_RULE_COUNT} rules)"
+
+  # Check current installation
+  log_info "Step 2/6: Checking current installation..."
+  CURRENT_VERSION="(none)"
+  CURRENT_RULE_COUNT="0"
+
+  if [[ -f "${INSTALL_PATH}/${BUNDLE_ID}.manifest.json" ]]; then
+    CURRENT_VERSION=$(jq -r '.version // "unknown"' "${INSTALL_PATH}/${BUNDLE_ID}.manifest.json" 2>/dev/null || echo "unknown")
+    CURRENT_RULE_COUNT=$(jq -r '.ruleCount // 0' "${INSTALL_PATH}/${BUNDLE_ID}.manifest.json" 2>/dev/null || echo "0")
+    log_step "Current version: ${CURRENT_VERSION} (${CURRENT_RULE_COUNT} rules)"
+  else
+    log_step "No current installation found"
+  fi
+
+  # Version comparison
+  if [[ "${CURRENT_VERSION}" != "(none)" ]]; then
+    if [[ "${CURRENT_VERSION}" == "${NEW_VERSION}" ]]; then
+      log_warn "New version (${NEW_VERSION}) is the same as current"
+      if [[ "${FORCE_ROTATION:-false}" != "true" ]]; then
+        log_warn "Use FORCE_ROTATION=true to reinstall"
+        exit 0
+      fi
+    elif [[ "${CURRENT_VERSION}" > "${NEW_VERSION}" ]]; then
+      log_warn "New version (${NEW_VERSION}) is older than current (${CURRENT_VERSION})"
+      if [[ "${FORCE_ROTATION:-false}" != "true" ]]; then
+        log_warn "Use FORCE_ROTATION=true to downgrade"
+        exit 1
+      fi
+    fi
+  fi
+
+  echo ""
+  log_info "Upgrade: ${CURRENT_VERSION} -> ${NEW_VERSION}"
+  echo ""
+
+  # Backup current installation
+  log_info "Step 3/6: Creating backup..."
+  BACKUP_DIR="${BACKUP_BASE}/$(date +%Y%m%d_%H%M%S)_${CURRENT_VERSION}"
+
+  if [[ -d "${INSTALL_PATH}" && -f "${INSTALL_PATH}/${BUNDLE_ID}.manifest.json" ]]; then
+    mkdir -p "${BACKUP_DIR}"
+    cp -a "${INSTALL_PATH}"/* "${BACKUP_DIR}/" 2>/dev/null || {
+      log_error "Failed to create backup"
+      exit 1
+    }
+    log_step "Backup created: ${BACKUP_DIR}"
+
+    # Create backup metadata
+    cat > "${BACKUP_DIR}/.backup-metadata.json" <<EOF
+{
+  "version": "${CURRENT_VERSION}",
+  "backupAt": "$(date -u +%Y-%m-%dT%H:%M:%SZ)",
+  "reason": "rotation-to-${NEW_VERSION}",
+  "hostname": "$(hostname -f 2>/dev/null || hostname)"
+}
+EOF
+  else
+    log_step "No existing installation to backup"
+    BACKUP_DIR=""
+  fi
+
+  # Set up error handler for rollback
+  trap cleanup_on_error ERR
+
+  # Install new bundle
+  log_info "Step 4/6: Installing new bundle..."
+  export FORCE_INSTALL=true
+  export REQUIRE_SIGNATURE="${REQUIRE_SIGNATURE:-true}"
+
+  if [[ -n "${ATTESTOR_MIRROR}" ]]; then
+    "${SCRIPT_DIR}/install-secrets-bundle.sh" "${NEW_BUNDLE_PATH}" "${INSTALL_PATH}" "${ATTESTOR_MIRROR}"
+  else
+    "${SCRIPT_DIR}/install-secrets-bundle.sh" "${NEW_BUNDLE_PATH}" "${INSTALL_PATH}"
+  fi
+
+  # Verify installation
+  log_info "Step 5/6: Verifying installation..."
+  INSTALLED_VERSION=$(jq -r '.version' "${INSTALL_PATH}/${BUNDLE_ID}.manifest.json" 2>/dev/null || echo "unknown")
+
+  if [[ "${INSTALLED_VERSION}" != "${NEW_VERSION}" ]]; then
+    log_error "Installation verification failed"
+    log_error "Expected version: ${NEW_VERSION}"
+    log_error "Installed version: ${INSTALLED_VERSION}"
+    exit 1
+  fi
+  log_step "Installation verified: ${INSTALLED_VERSION}"
+
+  # Remove error trap since installation succeeded
+  trap - ERR
+
+  # Restart workers
+  log_info "Step 6/6: Restarting workers..."
+  if [[ "${RESTART_WORKERS}" == "true" ]]; then
+    restart_workers "upgrade"
+  else
+    log_step "Worker restart skipped (RESTART_WORKERS=false)"
+  fi
+
+  # Cleanup old backups
+  cleanup_old_backups
+
+  # Generate rotation report
+  REPORT_FILE="${INSTALL_PATH}/.rotation-report.json"
+  cat > "${REPORT_FILE}" <<EOF
+{
+  "previousVersion": "${CURRENT_VERSION}",
+  "newVersion": "${NEW_VERSION}",
+  "previousRuleCount": ${CURRENT_RULE_COUNT},
+  "newRuleCount": ${NEW_RULE_COUNT},
+  "rotatedAt": "$(date -u +%Y-%m-%dT%H:%M:%SZ)",
+  "backupPath": "${BACKUP_DIR:-null}",
+  "hostname": "$(hostname -f 2>/dev/null || hostname)"
+}
+EOF
+
+  echo ""
+  echo "========================================"
+  log_info "Rotation completed successfully!"
+  echo ""
+  echo "Summary:"
+  echo "  Previous version: ${CURRENT_VERSION} (${CURRENT_RULE_COUNT} rules)"
+  echo "  New version:      ${NEW_VERSION} (${NEW_RULE_COUNT} rules)"
+  if [[ -n "${BACKUP_DIR}" ]]; then
+    echo "  Backup path:      ${BACKUP_DIR}"
+  fi
+  echo "  Report:           ${REPORT_FILE}"
+  echo ""
+  echo "To verify the upgrade:"
+  echo "  kubectl logs -l app=scanner-worker --tail=100 | grep SecretsAnalyzerHost"
+  echo ""
+  echo "To rollback if needed:"
+  echo "  $0 --rollback ${BACKUP_DIR:-/path/to/backup}"
+}
+
+# Handle rollback command
+if [[ "${1:-}" == "--rollback" ]]; then
+  ROLLBACK_BACKUP="${2:?Backup directory required for rollback}"
+  perform_rollback "${ROLLBACK_BACKUP}"
+  if [[ "${RESTART_WORKERS}" == "true" ]]; then
+    restart_workers "rollback"
+  fi
+  exit 0
+fi
+
+# Run main
+main "$@"
diff --git a/docs/24_OFFLINE_KIT.md b/docs/24_OFFLINE_KIT.md
index 57f1e993f..6872f1720 100755
--- a/docs/24_OFFLINE_KIT.md
+++ b/docs/24_OFFLINE_KIT.md
@@ -19,6 +19,7 @@ completely isolated network:
 | **Delta patches** | Daily diff bundles keep size \< 350 MB |
 | **Scanner plug-ins** | OS analyzers plus the Node.js, Go, .NET, Python, Ruby, Rust, and PHP language analyzers packaged under `plugins/scanner/analyzers/**` with manifests so Workers load deterministically offline. |
 | **Debug store** | `.debug` artefacts laid out under `debug/.build-id/<aa>/<rest>.debug` with `debug/debug-manifest.json` mapping build-ids to originating images for symbol retrieval. |
+| **Secret Detection Rules** | DSSE-signed rule bundles under `rules/secrets/<version>/` with manifest, JSONL rules, and signature envelope for air-gapped secret leak detection. |
 | **Telemetry collector bundle** | `telemetry/telemetry-offline-bundle.tar.gz` plus `.sha256`, containing OTLP collector config, Helm/Compose overlays, and operator instructions. |
 | **CLI + Task Packs** | `cli/` binaries from `release/cli`, Task Runner bootstrap (`bootstrap/task-runner/task-runner.yaml.sample`), and task-pack docs under `docs/task-packs/**` + `docs/modules/taskrunner/**`. |
 | **Orchestrator/Export/Notifier kits** | Orchestrator service, worker SDK, Postgres snapshot, dashboards (`orchestrator/**`), Export Center bundles (`export-center/**`), Notifier offline packs (`notifier/**`). |
@@ -41,6 +42,68 @@ completely isolated network:
 
 The PHP analyzer parses `composer.lock` for Composer dependencies and supports optional runtime evidence via the `stella-trace.php` shim; set `STELLA_PHP_OPCACHE=1` to enable opcache statistics collection.
 
+**Secret Detection Rules:**
+
+The Offline Kit includes DSSE-signed rule bundles for secret leak detection, enabling fully offline scanning for exposed credentials, API keys, and other sensitive data.
+
+**Bundle Structure:**
+```
+rules/secrets/<version>/
+  secrets.ruleset.manifest.json    # Bundle metadata (version, rule count, signer)
+  secrets.ruleset.rules.jsonl      # Rule definitions (one JSON per line)
+  secrets.ruleset.dsse.json        # DSSE signature envelope
+  SHA256SUMS                       # File checksums
+```
+
+**Manifest Format:**
+```json
+{
+  "bundleId": "secrets.ruleset",
+  "bundleType": "secrets",
+  "version": "2026.01",
+  "ruleCount": 150,
+  "signerKeyId": "stellaops-secrets-signer",
+  "signedAt": "2026-01-04T00:00:00Z",
+  "files": [
+    {
+      "name": "secrets.ruleset.rules.jsonl",
+      "digest": "sha256:...",
+      "sizeBytes": 45678
+    }
+  ]
+}
+```
+
+**Installation:**
+```bash
+# Verify bundle signature using local attestor mirror
+export STELLA_ATTESTOR_URL="file:///mnt/offline-kit/attestor-mirror"
+devops/offline/scripts/install-secrets-bundle.sh \
+  /mnt/offline-kit/rules/secrets/2026.01 \
+  /opt/stellaops/plugins/scanner/analyzers/secrets
+```
+
+**Bundle Rotation:**
+```bash
+# Upgrade to new version with automatic backup
+devops/offline/scripts/rotate-secrets-bundle.sh \
+  /mnt/offline-kit/rules/secrets/2026.02
+```
+
+**Enable Feature:**
+```yaml
+scanner:
+  features:
+    experimental:
+      secret-leak-detection: true
+```
+
+**Verify Bundle is Loaded:**
+```bash
+kubectl logs -l app=scanner-worker --tail=100 | grep SecretsAnalyzerHost
+# Expected: SecretsAnalyzerHost: Loaded bundle 2026.01 with 150 rules
+```
+
 **Python analyzer features:**
 - **Wheel/sdist/editable** parsing with dependency edges from `METADATA`, `PKG-INFO`, `requirements.txt`, and `pyproject.toml`
 - **Virtual environment** support for virtualenv, venv, and conda prefix layouts
diff --git a/docs/README.md b/docs/README.md
index d826568c7..c360d1afa 100755
--- a/docs/README.md
+++ b/docs/README.md
@@ -13,35 +13,35 @@ This documentation set is internal and does not keep compatibility stubs for old
 
 | Goal | Open this |
 | --- | --- |
-| Understand the product in 2 minutes | `overview.md` |
-| Run a first scan (CLI) | `quickstart.md` |
-| Browse capabilities | `key-features.md` |
-| Roadmap (priorities + definition of "done") | `05_ROADMAP.md` |
-| Architecture: high-level overview | `40_ARCHITECTURE_OVERVIEW.md` |
-| Architecture: full reference map | `07_HIGH_LEVEL_ARCHITECTURE.md` |
-| Architecture: user flows (UML) | `technical/architecture/user-flows.md` |
-| Architecture: module matrix (46 modules) | `technical/architecture/module-matrix.md` |
-| Architecture: data flows | `technical/architecture/data-flows.md` |
-| Architecture: schema mapping | `technical/architecture/schema-mapping.md` |
-| Offline / air-gap operations | `24_OFFLINE_KIT.md` |
-| Security deployment hardening | `17_SECURITY_HARDENING_GUIDE.md` |
-| Ingest advisories (Concelier + CLI) | `10_CONCELIER_CLI_QUICKSTART.md` |
-| Develop plugins/connectors | `10_PLUGIN_SDK_GUIDE.md` |
-| Console (Web UI) operator guide | `15_UI_GUIDE.md` |
-| VEX consensus and issuer trust | `16_VEX_CONSENSUS_GUIDE.md` |
-| Vulnerability Explorer guide | `20_VULNERABILITY_EXPLORER_GUIDE.md` |
+| Understand the product in 2 minutes | [overview.md](/docs/overview/) |
+| Run a first scan (CLI) | [quickstart.md](/docs/quickstart/) |
+| Browse capabilities | [key-features.md](/docs/key-features/) |
+| Roadmap (priorities + definition of "done") | [05_ROADMAP.md](/docs/05_roadmap/) |
+| Architecture: high-level overview | [40_ARCHITECTURE_OVERVIEW.md](/docs/40_architecture_overview/) |
+| Architecture: full reference map | [07_HIGH_LEVEL_ARCHITECTURE.md](/docs/07_high_level_architecture/) |
+| Architecture: user flows (UML) | [technical/architecture/user-flows.md](/docs/technical/architecture/user-flows/) |
+| Architecture: module matrix (46 modules) | [technical/architecture/module-matrix.md](/docs/technical/architecture/module-matrix/) |
+| Architecture: data flows | [technical/architecture/data-flows.md](/docs/technical/architecture/data-flows/) |
+| Architecture: schema mapping | [technical/architecture/schema-mapping.md](/docs/technical/architecture/schema-mapping/) |
+| Offline / air-gap operations | [24_OFFLINE_KIT.md](/docs/24_offline_kit/) |
+| Security deployment hardening | [17_SECURITY_HARDENING_GUIDE.md](/docs/17_security_hardening_guide/) |
+| Ingest advisories (Concelier + CLI) | [10_CONCELIER_CLI_QUICKSTART.md](/docs/10_concelier_cli_quickstart/) |
+| Develop plugins/connectors | [10_PLUGIN_SDK_GUIDE.md](/docs/10_plugin_sdk_guide/) |
+| Console (Web UI) operator guide | [15_UI_GUIDE.md](/docs/15_ui_guide/) |
+| VEX consensus and issuer trust | [16_VEX_CONSENSUS_GUIDE.md](/docs/16_vex_consensus_guide/) |
+| Vulnerability Explorer guide | [20_VULNERABILITY_EXPLORER_GUIDE.md](/docs/20_vulnerability_explorer_guide/) |
 
 ## Detailed Indexes
 
-- **Technical index (everything):** `docs/technical/README.md`
-- **End-to-end workflow flows:** `docs/flows/` (16 detailed flow documents)
-- **Module dossiers:** `docs/modules/`
-- **API contracts and samples:** `docs/api/`
-- **Architecture notes / ADRs:** `docs/architecture/`, `docs/adr/`
-- **Operations and deployment:** `docs/operations/`, `docs/deploy/`, `docs/deployment/`
-- **Air-gap workflows:** `docs/airgap/`
-- **Security deep dives:** `docs/security/`
-- **Benchmarks and fixtures:** `docs/benchmarks/`, `docs/assets/`
+- **Technical index (everything):** [docs/technical/README.md](/docs/technical/)
+- **End-to-end workflow flows:** [docs/flows/](/docs/flows/) (16 detailed flow documents)
+- **Module dossiers:** [docs/modules/](/docs/modules/)
+- **API contracts and samples:** [docs/api/](/docs/api/)
+- **Architecture notes / ADRs:** [docs/architecture/](/docs/architecture/), [docs/adr/](/docs/adr/)
+- **Operations and deployment:** [docs/operations/](/docs/operations/), [docs/deploy/](/docs/deploy/), [docs/deployment/](/docs/deployment/)
+- **Air-gap workflows:** [docs/airgap/](/docs/airgap/)
+- **Security deep dives:** [docs/security/](/docs/security/)
+- **Benchmarks and fixtures:** [docs/benchmarks/](/docs/benchmarks/), [docs/assets/](/docs/assets/)
 
 ## Notes
 
diff --git a/docs/implplan/SPRINT_20260104_001_BE_determinism_timeprovider_injection.md b/docs/implplan/SPRINT_20260104_001_BE_determinism_timeprovider_injection.md
index d63be6403..2b7fae6e3 100644
--- a/docs/implplan/SPRINT_20260104_001_BE_determinism_timeprovider_injection.md
+++ b/docs/implplan/SPRINT_20260104_001_BE_determinism_timeprovider_injection.md
@@ -64,13 +64,13 @@
 | 8 | DET-008 | DONE | DET-002, DET-003 | Guild | Refactor Registry module (1 file: RegistryTokenIssuer) |
 | 9 | DET-009 | DONE | DET-002, DET-003 | Guild | Refactor Replay module (6 files: ReplayEngine, ReplayModels, ReplayExportModels, ReplayManifestExporter, FeedSnapshotCoordinatorService, PolicySimulationInputLock) |
 | 10 | DET-010 | DONE | DET-002, DET-003 | Guild | Refactor RiskEngine module (skipped - no determinism issues found) |
-| 11 | DET-011 | TODO | DET-002, DET-003 | Guild | Refactor Scanner module (~45+ matches remaining) |
+| 11 | DET-011 | DOING | DET-002, DET-003 | Guild | Refactor Scanner module - Explainability (2 files: RiskReport, FalsifiabilityGenerator), Sources (5 files: ConnectionTesters, SourceConnectionTester, SourceTriggerDispatcher), VulnSurfaces (1 file: PostgresVulnSurfaceRepository), Storage (5 files: PostgresProofSpineRepository, PostgresScanMetricsRepository, RuntimeEventRepository, PostgresFuncProofRepository, PostgresIdempotencyKeyRepository), Storage.Oci (1 file: SlicePullService) |
 | 12 | DET-012 | DONE | DET-002, DET-003 | Guild | Refactor Scheduler module (WebService, Persistence, Worker projects - 30+ files updated, tests migrated to FakeTimeProvider) |
-| 13 | DET-013 | TODO | DET-002, DET-003 | Guild | Refactor Signer module (~89 matches remaining) |
+| 13 | DET-013 | DONE | DET-002, DET-003 | Guild | Refactor Signer module (16 production files refactored: AmbientOidcTokenProvider, EphemeralKeyPair, IOidcTokenProvider, IFulcioClient, TrustAnchorManager, KeyRotationService, DefaultSigningKeyResolver, SigstoreSigningService, InMemorySignerAuditSink, KeyRotationEndpoints, Program.cs) |
 | 14 | DET-014 | DONE | DET-002, DET-003 | Guild | Refactor Unknowns module (skipped - no determinism issues found) |
-| 15 | DET-015 | TODO | DET-002, DET-003 | Guild | Refactor VexLens module (~76 matches remaining) |
+| 15 | DET-015 | DONE | DET-002, DET-003 | Guild | Refactor VexLens module (production files: IConsensusRationaleCache, InMemorySourceTrustScoreCache, ISourceTrustScoreCalculator, InMemoryIssuerDirectory, InMemoryConsensusProjectionStore, OpenVexNormalizer, CycloneDxVexNormalizer, CsafVexNormalizer, IConsensusJobService, VexProofBuilder, IConsensusExportService, IVexLensApiService, TrustScorecardApiModels, OrchestratorLedgerEventEmitter, PostgresConsensusProjectionStore, PostgresConsensusProjectionStoreProxy, ProvenanceChainValidator, VexConsensusEngine, IConsensusRationaleService, VexLensEndpointExtensions) |
 | 16 | DET-016 | DONE | DET-002, DET-003 | Guild | Refactor VulnExplorer module (1 file: VexDecisionStore) |
-| 17 | DET-017 | TODO | DET-002, DET-003 | Guild | Refactor Zastava module (~48 matches remaining) |
+| 17 | DET-017 | DONE | DET-002, DET-003 | Guild | Refactor Zastava module (~48 matches remaining) |
 | 18 | DET-018 | TODO | DET-004 to DET-017 | Guild | Final audit: verify zero direct DateTime/Guid/Random calls in production code |
 
 ## Implementation Pattern
@@ -123,6 +123,12 @@ services.AddSingleton<IGuidProvider, SystemGuidProvider>();
 | 2026-01-05 | DET-005: Provcache module refactored - 8 files (EvidenceChunker, LazyFetchOrchestrator, MinimalProofExporter, FeedEpochAdvancedEvent, SignerRevokedEvent, Postgres repos, ValkeyProvcacheStore) | Agent |
 | 2026-01-05 | DET-006 to DET-010: Batch completed - ReachGraph (1 file), Registry (1 file), Replay (6 files); Provenance, RiskEngine, Unknowns already clean | Agent |
 | 2026-01-05 | Remaining modules assessed: Scanner (~45), Scheduler (~20), Signer (~89), VexLens (~76), VulnExplorer (3), Zastava (~48) matches | Agent |
+| 2026-01-05 | DET-012 complete: Scheduler module refactored - WebService, Persistence, Worker projects (30+ files) | Agent |
+| 2026-01-05 | DET-013 complete: Signer module refactored - Keyless (4 files: AmbientOidcTokenProvider, EphemeralKeyPair, IOidcTokenProvider, IFulcioClient with IsExpiredAt/IsValidAt methods), KeyManagement (2 files: TrustAnchorManager, KeyRotationService), Infrastructure (3 files: DefaultSigningKeyResolver, SigstoreSigningService, InMemorySignerAuditSink), WebService (2 files: Program.cs, KeyRotationEndpoints) | Agent |
+
+| 2026-01-05 | DET-015 complete: VexLens module refactored - 20 production files (caching, storage, normalization, orchestration, API, consensus, trust, persistence) with TimeProvider and IGuidProvider injection. Note: Pre-existing build errors in NoiseGateService.cs and NoiseGatingApiModels.cs unrelated to determinism changes. | Agent |
+| 2026-01-05 | DET-017 complete: Zastava module refactored - Agent (RuntimeEventsClient, HealthCheckHostedService, RuntimeEventDispatchService, RuntimeEventBuffer), Observer (RuntimeEventDispatchService, RuntimeEventBuffer, ProcSnapshotCollector, EbpfProbeManager), Webhook (WebhookCertificateHealthCheck) with TimeProvider and IGuidProvider injection. | Agent |
+| 2026-01-05 | DET-011 in progress: Scanner module refactoring - 14 production files refactored (RiskReport.cs, FalsifiabilityGenerator.cs, SourceConnectionTester.cs, SourceTriggerDispatcher.cs, DockerConnectionTester.cs, ZastavaConnectionTester.cs, GitConnectionTester.cs, PostgresVulnSurfaceRepository.cs, PostgresProofSpineRepository.cs, PostgresScanMetricsRepository.cs, RuntimeEventRepository.cs, PostgresFuncProofRepository.cs, PostgresIdempotencyKeyRepository.cs, SlicePullService.cs). Added Determinism.Abstractions references to 4 Scanner sub-projects. | Agent |
 
 ## Decisions & Risks
 - **Decision:** Defer determinism refactoring from MAINT audit to dedicated sprint for focused, systematic approach.
diff --git a/docs/implplan/SPRINT_20260104_005_AIRGAP_secret_offline_kit.md b/docs/implplan/SPRINT_20260104_005_AIRGAP_secret_offline_kit.md
index 7f815c5d2..398fa3eb2 100644
--- a/docs/implplan/SPRINT_20260104_005_AIRGAP_secret_offline_kit.md
+++ b/docs/implplan/SPRINT_20260104_005_AIRGAP_secret_offline_kit.md
@@ -30,16 +30,16 @@ Integrate secret detection rule bundles with the Offline Kit infrastructure for
 
 | # | Task ID | Status | Key dependency / next step | Owners | Task Definition |
 | --- | --- | --- | --- | --- | --- |
-| 1 | OKS-001 | TODO | None | AirGap Guild | Update Offline Kit manifest schema for rules |
-| 2 | OKS-002 | TODO | OKS-001 | AirGap Guild | Add secrets bundle to BundleBuilder |
-| 3 | OKS-003 | TODO | OKS-002 | AirGap Guild | Create bundle verification in Importer |
-| 4 | OKS-004 | TODO | None | AirGap Guild | Add Attestor mirror support for bundle verification |
-| 5 | OKS-005 | TODO | OKS-003 | AirGap Guild | Create bundle installation script |
-| 6 | OKS-006 | TODO | OKS-005 | AirGap Guild | Add bundle rotation/upgrade workflow |
-| 7 | OKS-007 | TODO | None | CI/CD Guild | Add bundle to release workflow |
-| 8 | OKS-008 | TODO | All | AirGap Guild | Add integration tests for offline flow |
-| 9 | OKS-009 | TODO | All | Docs Guild | Update offline kit documentation |
-| 10 | OKS-010 | TODO | All | DevOps Guild | Update Helm charts for bundle mounting |
+| 1 | OKS-001 | DONE | None | AirGap Guild | Update Offline Kit manifest schema for rules |
+| 2 | OKS-002 | DONE | OKS-001 | AirGap Guild | Add secrets bundle to BundleBuilder |
+| 3 | OKS-003 | DONE | OKS-002 | AirGap Guild | Create bundle verification in Importer |
+| 4 | OKS-004 | DONE | None | AirGap Guild | Add Attestor mirror support for bundle verification |
+| 5 | OKS-005 | DONE | OKS-003 | AirGap Guild | Create bundle installation script |
+| 6 | OKS-006 | DONE | OKS-005 | AirGap Guild | Add bundle rotation/upgrade workflow |
+| 7 | OKS-007 | DONE | None | CI/CD Guild | Add bundle to release workflow |
+| 8 | OKS-008 | DONE | All | AirGap Guild | Add integration tests for offline flow |
+| 9 | OKS-009 | DONE | All | Docs Guild | Update offline kit documentation |
+| 10 | OKS-010 | DONE | All | DevOps Guild | Update Helm charts for bundle mounting |
 
 ## Task Details
 
@@ -588,4 +588,17 @@ devops/offline/
 | Date | Action | Notes |
 |------|--------|-------|
 | 2026-01-04 | Sprint created | Part of secret leak detection implementation |
+| 2026-01-04 | OKS-001 DONE | Added RuleBundleComponent to OfflineKitManifest.cs with rules schema |
+| 2026-01-04 | OKS-002 DONE | Extended SnapshotBundleWriter/Reader, added RulesSnapshotExtractor |
+| 2026-01-04 | OKS-003 DONE | Created RuleBundleValidator with digest/signature/monotonicity checks |
+| 2026-01-04 | OKS-004 DONE | Added RuleBundleSigningPath to FileSystemRootStore, DsseVerifier support |
+| 2026-01-04 | OKS-005 DONE | Created devops/offline/scripts/install-secrets-bundle.sh |
+| 2026-01-04 | OKS-006 DONE | Created devops/offline/scripts/rotate-secrets-bundle.sh with rollback |
+| 2026-01-04 | OKS-007 DONE | Created .gitea/workflows/secrets-bundle-release.yml CI/CD workflow |
+| 2026-01-04 | OKS-008 DONE | Added RuleBundleValidatorTests.cs with 8 test cases |
+| 2026-01-04 | OKS-009 DONE | Updated docs/24_OFFLINE_KIT.md with secrets bundle documentation |
+| 2026-01-04 | OKS-010 DONE | Updated values-airgap.yaml with secrets-rules volume mount and PVC |
+| 2026-01-04 | Fix build errors | Fixed 4 nullability errors in OfflineVerificationPolicy.cs, JsonNormalizer.cs, SbomNormalizer.cs |
+| 2026-01-04 | Fix test versions | Updated RuleBundleValidatorTests to use 3-part semver (2026.1.0) instead of CalVer |
+| 2026-01-04 | Sprint complete | All 10 tasks completed, build passes, tests pass (9/9) |
 
diff --git a/docs/implplan/SPRINT_20260104_006_BE_secret_detection_config_api.md b/docs/implplan/SPRINT_20260104_006_BE_secret_detection_config_api.md
new file mode 100644
index 000000000..e36e32fd2
--- /dev/null
+++ b/docs/implplan/SPRINT_20260104_006_BE_secret_detection_config_api.md
@@ -0,0 +1,213 @@
+# Sprint 20260104_006_BE - Secret Detection Configuration API
+
+## Topic & Scope
+
+Backend APIs and data models for configuring secret detection behavior per tenant. This sprint provides the foundation for UI configuration of secret leak detection.
+
+**Key deliverables:**
+1. **Tenant Settings Model**: Per-tenant secret detection configuration
+2. **Revelation Policy**: Control how detected secrets are displayed/masked
+3. **Exception Management**: Allowlist patterns for false positives
+4. **Configuration API**: CRUD endpoints for settings
+
+**Working directory:** `src/Scanner/`, `src/Platform/`
+
+## Dependencies & Concurrency
+
+- **Depends on**: Sprint 20260104_001 (Core Analyzer), Sprint 20260104_002 (Rule Bundles)
+- **Parallel with**: Sprint 20260104_007 (Alert Integration)
+- **Blocks**: Sprint 20260104_008 (UI)
+
+## Documentation Prerequisites
+
+- docs/modules/scanner/operations/secret-leak-detection.md
+- CLAUDE.md Section 8 (Determinism)
+
+## Delivery Tracker
+
+| # | Task ID | Status | Key dependency / next step | Owners | Task Definition |
+| --- | --- | --- | --- | --- | --- |
+| 1 | SDC-001 | TODO | None | Scanner Guild | Define SecretDetectionSettings domain model |
+| 2 | SDC-002 | TODO | SDC-001 | Scanner Guild | Create SecretRevelationPolicy enum and config |
+| 3 | SDC-003 | TODO | SDC-001 | Scanner Guild | Create SecretExceptionPattern model for allowlists |
+| 4 | SDC-004 | TODO | SDC-001 | Platform Guild | Add persistence (EF Core migrations) |
+| 5 | SDC-005 | TODO | SDC-004 | Platform Guild | Create Settings CRUD API endpoints |
+| 6 | SDC-006 | TODO | SDC-005 | Platform Guild | Add OpenAPI spec for settings endpoints |
+| 7 | SDC-007 | TODO | SDC-003 | Scanner Guild | Integrate exception patterns into SecretsAnalyzerHost |
+| 8 | SDC-008 | TODO | SDC-002 | Scanner Guild | Implement revelation policy in findings output |
+| 9 | SDC-009 | TODO | All | Scanner Guild | Add unit and integration tests |
+
+## Task Details
+
+### SDC-001: SecretDetectionSettings Domain Model
+
+```csharp
+public sealed record SecretDetectionSettings
+{
+    public required Guid TenantId { get; init; }
+    public required bool Enabled { get; init; }
+    public required SecretRevelationPolicy RevelationPolicy { get; init; }
+    public required IReadOnlyList<string> EnabledRuleCategories { get; init; }
+    public required IReadOnlyList<SecretExceptionPattern> Exceptions { get; init; }
+    public required SecretAlertSettings AlertSettings { get; init; }
+    public required DateTimeOffset UpdatedAt { get; init; }
+    public required string UpdatedBy { get; init; }
+}
+```
+
+Location: `src/Scanner/__Libraries/StellaOps.Scanner.Core/Secrets/Configuration/`
+
+### SDC-002: SecretRevelationPolicy
+
+Control how detected secrets appear in different contexts:
+
+```csharp
+public enum SecretRevelationPolicy
+{
+    /// <summary>
+    /// Show only that a secret was detected, no value shown.
+    /// Example: [SECRET_DETECTED: aws_access_key_id]
+    /// </summary>
+    FullMask = 0,
+
+    /// <summary>
+    /// Show first and last 4 characters.
+    /// Example: AKIA****WXYZ
+    /// </summary>
+    PartialReveal = 1,
+
+    /// <summary>
+    /// Show full value (requires elevated permissions).
+    /// Use only for debugging/incident response.
+    /// </summary>
+    FullReveal = 2
+}
+
+public sealed record RevelationPolicyConfig
+{
+    /// <summary>Default policy for UI/API responses.</summary>
+    public SecretRevelationPolicy DefaultPolicy { get; init; } = SecretRevelationPolicy.PartialReveal;
+
+    /// <summary>Policy for exported reports (PDF, JSON).</summary>
+    public SecretRevelationPolicy ExportPolicy { get; init; } = SecretRevelationPolicy.FullMask;
+
+    /// <summary>Policy for logs and telemetry.</summary>
+    public SecretRevelationPolicy LogPolicy { get; init; } = SecretRevelationPolicy.FullMask;
+
+    /// <summary>Roles allowed to use FullReveal.</summary>
+    public IReadOnlyList<string> FullRevealRoles { get; init; } = ["security-admin", "incident-responder"];
+
+    /// <summary>Number of characters to show at start/end for PartialReveal.</summary>
+    public int PartialRevealChars { get; init; } = 4;
+}
+```
+
+### SDC-003: SecretExceptionPattern (Allowlist)
+
+```csharp
+public sealed record SecretExceptionPattern
+{
+    public required Guid Id { get; init; }
+    public required string Name { get; init; }
+    public required string Description { get; init; }
+
+    /// <summary>Regex pattern to match against detected secret value.</summary>
+    public required string Pattern { get; init; }
+
+    /// <summary>Optional: Only apply to specific rule IDs.</summary>
+    public IReadOnlyList<string>? ApplicableRuleIds { get; init; }
+
+    /// <summary>Optional: Only apply to specific file paths.</summary>
+    public string? FilePathGlob { get; init; }
+
+    /// <summary>Reason for exception (audit trail).</summary>
+    public required string Justification { get; init; }
+
+    /// <summary>Expiration date (null = permanent).</summary>
+    public DateTimeOffset? ExpiresAt { get; init; }
+
+    public required DateTimeOffset CreatedAt { get; init; }
+    public required string CreatedBy { get; init; }
+}
+```
+
+### SDC-005: Settings API Endpoints
+
+```
+GET    /api/v1/tenants/{tenantId}/settings/secret-detection
+PUT    /api/v1/tenants/{tenantId}/settings/secret-detection
+PATCH  /api/v1/tenants/{tenantId}/settings/secret-detection
+
+GET    /api/v1/tenants/{tenantId}/settings/secret-detection/exceptions
+POST   /api/v1/tenants/{tenantId}/settings/secret-detection/exceptions
+DELETE /api/v1/tenants/{tenantId}/settings/secret-detection/exceptions/{exceptionId}
+
+GET    /api/v1/tenants/{tenantId}/settings/secret-detection/rule-categories
+```
+
+### SDC-008: Revelation Policy Implementation
+
+```csharp
+public static class SecretMasker
+{
+    public static string Mask(string secretValue, SecretRevelationPolicy policy, int partialChars = 4)
+    {
+        return policy switch
+        {
+            SecretRevelationPolicy.FullMask => "[REDACTED]",
+            SecretRevelationPolicy.PartialReveal => MaskPartial(secretValue, partialChars),
+            SecretRevelationPolicy.FullReveal => secretValue,
+            _ => "[REDACTED]"
+        };
+    }
+
+    private static string MaskPartial(string value, int chars)
+    {
+        if (value.Length <= chars * 2)
+            return new string('*', value.Length);
+
+        var prefix = value[..chars];
+        var suffix = value[^chars..];
+        var masked = new string('*', Math.Min(value.Length - chars * 2, 8));
+        return $"{prefix}{masked}{suffix}";
+    }
+}
+```
+
+## Directory Structure
+
+```
+src/Scanner/__Libraries/StellaOps.Scanner.Core/
+├── Secrets/
+│   ├── Configuration/
+│   │   ├── SecretDetectionSettings.cs
+│   │   ├── SecretRevelationPolicy.cs
+│   │   ├── RevelationPolicyConfig.cs
+│   │   ├── SecretExceptionPattern.cs
+│   │   └── SecretAlertSettings.cs
+│   └── Masking/
+│       └── SecretMasker.cs
+
+src/Platform/StellaOps.Platform.WebService/
+├── Endpoints/
+│   └── SecretDetectionSettingsEndpoints.cs
+└── Persistence/
+    └── Migrations/
+        └── AddSecretDetectionSettings.cs
+```
+
+## Decisions & Risks
+
+| Decision | Rationale |
+|----------|-----------|
+| Per-tenant settings | Multi-tenant isolation requirement |
+| Role-based full reveal | Security: prevent accidental exposure |
+| Exception expiration | Force periodic review of allowlists |
+| Separate export/log policies | Defense in depth for sensitive data |
+
+## Execution Log
+
+| Date | Action | Notes |
+|------|--------|-------|
+| 2026-01-04 | Sprint created | Gap identified in secret detection feature |
+
diff --git a/docs/implplan/SPRINT_20260104_007_BE_secret_detection_alerts.md b/docs/implplan/SPRINT_20260104_007_BE_secret_detection_alerts.md
new file mode 100644
index 000000000..3b7a6bc74
--- /dev/null
+++ b/docs/implplan/SPRINT_20260104_007_BE_secret_detection_alerts.md
@@ -0,0 +1,290 @@
+# Sprint 20260104_007_BE - Secret Detection Alert Integration
+
+## Topic & Scope
+
+Integration between secret detection findings and the Notify service for real-time alerting when secrets are discovered in scans.
+
+**Key deliverables:**
+1. **Alert Routing**: Route secret findings to configured channels
+2. **Alert Templates**: Formatted notifications for different channels
+3. **Rate Limiting**: Prevent alert fatigue from mass findings
+4. **Severity Mapping**: Map rule severity to alert priority
+
+**Working directory:** `src/Scanner/`, `src/Notify/`
+
+## Dependencies & Concurrency
+
+- **Depends on**: Sprint 20260104_001 (Core Analyzer), Sprint 20260104_006 (Config API)
+- **Parallel with**: Sprint 20260104_008 (UI)
+- **Blocks**: Production deployment with alerting
+
+## Documentation Prerequisites
+
+- docs/modules/notify/architecture.md
+- docs/modules/scanner/operations/secret-leak-detection.md
+
+## Delivery Tracker
+
+| # | Task ID | Status | Key dependency / next step | Owners | Task Definition |
+| --- | --- | --- | --- | --- | --- |
+| 1 | SDA-001 | TODO | None | Scanner Guild | Define SecretAlertSettings model |
+| 2 | SDA-002 | TODO | SDA-001 | Scanner Guild | Create SecretFindingAlertEvent |
+| 3 | SDA-003 | TODO | SDA-002 | Notify Guild | Add secret-finding alert template |
+| 4 | SDA-004 | TODO | SDA-003 | Notify Guild | Implement Slack/Teams formatters |
+| 5 | SDA-005 | TODO | SDA-002 | Scanner Guild | Add alert emission to SecretsAnalyzerHost |
+| 6 | SDA-006 | TODO | SDA-005 | Scanner Guild | Implement rate limiting / deduplication |
+| 7 | SDA-007 | TODO | SDA-006 | Scanner Guild | Add severity-based routing |
+| 8 | SDA-008 | TODO | SDA-001 | Platform Guild | Add alert settings to config API |
+| 9 | SDA-009 | TODO | All | Scanner Guild | Add integration tests |
+
+## Task Details
+
+### SDA-001: SecretAlertSettings Model
+
+```csharp
+public sealed record SecretAlertSettings
+{
+    /// <summary>Enable/disable alerting for this tenant.</summary>
+    public bool Enabled { get; init; } = true;
+
+    /// <summary>Minimum severity to trigger alert (Critical, High, Medium, Low).</summary>
+    public SecretSeverity MinimumAlertSeverity { get; init; } = SecretSeverity.High;
+
+    /// <summary>Alert destinations by channel type.</summary>
+    public IReadOnlyList<SecretAlertDestination> Destinations { get; init; } = [];
+
+    /// <summary>Rate limit: max alerts per scan.</summary>
+    public int MaxAlertsPerScan { get; init; } = 10;
+
+    /// <summary>Deduplication window: don't re-alert same secret within this period.</summary>
+    public TimeSpan DeduplicationWindow { get; init; } = TimeSpan.FromHours(24);
+
+    /// <summary>Include file path in alert (may reveal repo structure).</summary>
+    public bool IncludeFilePath { get; init; } = true;
+
+    /// <summary>Include masked secret value in alert.</summary>
+    public bool IncludeMaskedValue { get; init; } = true;
+}
+
+public sealed record SecretAlertDestination
+{
+    public required Guid Id { get; init; }
+    public required AlertChannelType ChannelType { get; init; }
+    public required string ChannelId { get; init; } // Slack channel ID, email, webhook URL
+    public IReadOnlyList<SecretSeverity>? SeverityFilter { get; init; }
+    public IReadOnlyList<string>? RuleCategoryFilter { get; init; }
+}
+
+public enum AlertChannelType
+{
+    Slack,
+    Teams,
+    Email,
+    Webhook,
+    PagerDuty
+}
+```
+
+### SDA-002: SecretFindingAlertEvent
+
+```csharp
+public sealed record SecretFindingAlertEvent
+{
+    public required Guid EventId { get; init; }
+    public required Guid TenantId { get; init; }
+    public required Guid ScanId { get; init; }
+    public required string ImageRef { get; init; }
+
+    public required SecretSeverity Severity { get; init; }
+    public required string RuleId { get; init; }
+    public required string RuleName { get; init; }
+    public required string RuleCategory { get; init; }
+
+    public required string FilePath { get; init; }
+    public required int LineNumber { get; init; }
+    public required string MaskedValue { get; init; }
+
+    public required DateTimeOffset DetectedAt { get; init; }
+    public required string ScanTriggeredBy { get; init; }
+
+    /// <summary>Deduplication key for rate limiting.</summary>
+    public string DeduplicationKey => $"{TenantId}:{RuleId}:{FilePath}:{LineNumber}";
+}
+```
+
+### SDA-003: Alert Templates
+
+**Slack Template:**
+```json
+{
+  "blocks": [
+    {
+      "type": "header",
+      "text": {
+        "type": "plain_text",
+        "text": "🚨 Secret Detected in Container Scan"
+      }
+    },
+    {
+      "type": "section",
+      "fields": [
+        { "type": "mrkdwn", "text": "*Severity:*\n{{severity}}" },
+        { "type": "mrkdwn", "text": "*Rule:*\n{{ruleName}}" },
+        { "type": "mrkdwn", "text": "*Image:*\n`{{imageRef}}`" },
+        { "type": "mrkdwn", "text": "*File:*\n`{{filePath}}:{{lineNumber}}`" }
+      ]
+    },
+    {
+      "type": "section",
+      "text": {
+        "type": "mrkdwn",
+        "text": "*Detected Value:*\n```{{maskedValue}}```"
+      }
+    },
+    {
+      "type": "actions",
+      "elements": [
+        {
+          "type": "button",
+          "text": { "type": "plain_text", "text": "View in StellaOps" },
+          "url": "{{findingUrl}}"
+        },
+        {
+          "type": "button",
+          "text": { "type": "plain_text", "text": "Add Exception" },
+          "url": "{{exceptionUrl}}"
+        }
+      ]
+    }
+  ]
+}
+```
+
+### SDA-005: Alert Emission in SecretsAnalyzerHost
+
+```csharp
+public sealed class SecretsAnalyzerHost
+{
+    private readonly ISecretAlertEmitter _alertEmitter;
+    private readonly ISecretAlertDeduplicator _deduplicator;
+
+    public async Task OnSecretFoundAsync(
+        SecretFinding finding,
+        ScanContext context,
+        CancellationToken ct)
+    {
+        var settings = await _settingsProvider.GetAlertSettingsAsync(context.TenantId, ct);
+
+        if (!settings.Enabled)
+            return;
+
+        if (finding.Severity < settings.MinimumAlertSeverity)
+            return;
+
+        var alertEvent = MapToAlertEvent(finding, context);
+
+        // Check deduplication
+        if (await _deduplicator.IsDuplicateAsync(alertEvent, settings.DeduplicationWindow, ct))
+        {
+            _logger.LogDebug("secret.alert.deduplicated key={key}", alertEvent.DeduplicationKey);
+            return;
+        }
+
+        // Rate limiting
+        var alertCount = await _alertEmitter.GetAlertCountForScanAsync(context.ScanId, ct);
+        if (alertCount >= settings.MaxAlertsPerScan)
+        {
+            _logger.LogWarning("secret.alert.rate_limited scan_id={scan_id} count={count}",
+                context.ScanId, alertCount);
+            return;
+        }
+
+        // Emit to configured destinations
+        await _alertEmitter.EmitAsync(alertEvent, settings.Destinations, ct);
+    }
+}
+```
+
+### SDA-006: Rate Limiting & Deduplication
+
+```csharp
+public interface ISecretAlertDeduplicator
+{
+    Task<bool> IsDuplicateAsync(
+        SecretFindingAlertEvent alert,
+        TimeSpan window,
+        CancellationToken ct);
+
+    Task RecordAlertAsync(
+        SecretFindingAlertEvent alert,
+        CancellationToken ct);
+}
+
+public sealed class ValkeySecretAlertDeduplicator : ISecretAlertDeduplicator
+{
+    private readonly IValkeyConnection _valkey;
+
+    public async Task<bool> IsDuplicateAsync(
+        SecretFindingAlertEvent alert,
+        TimeSpan window,
+        CancellationToken ct)
+    {
+        var key = $"secret:alert:dedup:{alert.DeduplicationKey}";
+        var exists = await _valkey.ExistsAsync(key);
+        return exists;
+    }
+
+    public async Task RecordAlertAsync(
+        SecretFindingAlertEvent alert,
+        CancellationToken ct)
+    {
+        var key = $"secret:alert:dedup:{alert.DeduplicationKey}";
+        await _valkey.SetAsync(key, alert.EventId.ToString(), expiry: TimeSpan.FromHours(24));
+    }
+}
+```
+
+## Severity Mapping
+
+| Rule Severity | Alert Priority | Default Behavior |
+|---------------|----------------|------------------|
+| Critical | P1 / Immediate | Always alert, page on-call |
+| High | P2 / Urgent | Alert to security channel |
+| Medium | P3 / Normal | Alert if configured |
+| Low | P4 / Info | No alert by default |
+
+## Directory Structure
+
+```
+src/Scanner/__Libraries/StellaOps.Scanner.Core/
+├── Secrets/
+│   ├── Alerts/
+│   │   ├── SecretAlertSettings.cs
+│   │   ├── SecretFindingAlertEvent.cs
+│   │   ├── ISecretAlertEmitter.cs
+│   │   ├── ISecretAlertDeduplicator.cs
+│   │   └── ValkeySecretAlertDeduplicator.cs
+
+src/Notify/__Libraries/StellaOps.Notify.Engine/
+├── Templates/
+│   └── SecretFindingAlertTemplate.cs
+├── Formatters/
+│   ├── SlackSecretAlertFormatter.cs
+│   └── TeamsSecretAlertFormatter.cs
+```
+
+## Decisions & Risks
+
+| Decision | Rationale |
+|----------|-----------|
+| Valkey for deduplication | Fast, distributed, TTL support |
+| Per-scan rate limit | Prevent alert storms on large findings |
+| Masked values in alerts | Balance security awareness vs exposure |
+| Severity-based routing | Different channels for different priorities |
+
+## Execution Log
+
+| Date | Action | Notes |
+|------|--------|-------|
+| 2026-01-04 | Sprint created | Alert integration for secret detection |
+
diff --git a/docs/implplan/SPRINT_20260104_008_FE_secret_detection_ui.md b/docs/implplan/SPRINT_20260104_008_FE_secret_detection_ui.md
new file mode 100644
index 000000000..3af1d7a0d
--- /dev/null
+++ b/docs/implplan/SPRINT_20260104_008_FE_secret_detection_ui.md
@@ -0,0 +1,499 @@
+# Sprint 20260104_008_FE - Secret Detection UI
+
+## Topic & Scope
+
+Frontend components for configuring and viewing secret detection findings. Provides tenant administrators with tools to manage detection settings, view findings, and configure alerts.
+
+**Key deliverables:**
+1. **Settings Page**: Configure secret detection for tenant
+2. **Findings Viewer**: View detected secrets with proper masking
+3. **Exception Manager**: Add/remove allowlist patterns
+4. **Alert Configuration**: Set up notification channels
+
+**Working directory:** `src/Web/StellaOps.Web/`
+
+## Dependencies & Concurrency
+
+- **Depends on**: Sprint 20260104_006 (Config API), Sprint 20260104_007 (Alerts)
+- **Parallel with**: None (final UI sprint)
+- **Blocks**: Feature release
+
+## Documentation Prerequisites
+
+- docs/modules/web/architecture.md
+- Angular v17 component patterns
+
+## Delivery Tracker
+
+| # | Task ID | Status | Key dependency / next step | Owners | Task Definition |
+| --- | --- | --- | --- | --- | --- |
+| 1 | SDU-001 | TODO | None | Frontend Guild | Create secret-detection feature module |
+| 2 | SDU-002 | TODO | SDU-001 | Frontend Guild | Build settings page component |
+| 3 | SDU-003 | TODO | SDU-002 | Frontend Guild | Add revelation policy selector |
+| 4 | SDU-004 | TODO | SDU-002 | Frontend Guild | Build rule category toggles |
+| 5 | SDU-005 | TODO | SDU-001 | Frontend Guild | Create findings list component |
+| 6 | SDU-006 | TODO | SDU-005 | Frontend Guild | Implement masked value display |
+| 7 | SDU-007 | TODO | SDU-005 | Frontend Guild | Add finding detail drawer |
+| 8 | SDU-008 | TODO | SDU-001 | Frontend Guild | Build exception manager component |
+| 9 | SDU-009 | TODO | SDU-008 | Frontend Guild | Create exception form with validation |
+| 10 | SDU-010 | TODO | SDU-001 | Frontend Guild | Build alert destination config |
+| 11 | SDU-011 | TODO | SDU-010 | Frontend Guild | Add channel test functionality |
+| 12 | SDU-012 | TODO | All | Frontend Guild | Add E2E tests |
+
+## Task Details
+
+### SDU-002: Settings Page Component
+
+```typescript
+// secret-detection-settings.component.ts
+@Component({
+  selector: 'app-secret-detection-settings',
+  template: `
+    <div class="settings-container">
+      <header class="settings-header">
+        <h1>Secret Detection</h1>
+        <mat-slide-toggle
+          [checked]="settings()?.enabled"
+          (change)="onEnabledChange($event)"
+          color="primary">
+          {{ settings()?.enabled ? 'Enabled' : 'Disabled' }}
+        </mat-slide-toggle>
+      </header>
+
+      <mat-tab-group>
+        <mat-tab label="General">
+          <app-revelation-policy-config
+            [policy]="settings()?.revelationPolicy"
+            (policyChange)="onPolicyChange($event)" />
+
+          <app-rule-category-selector
+            [categories]="availableCategories()"
+            [selected]="settings()?.enabledRuleCategories"
+            (selectionChange)="onCategoriesChange($event)" />
+        </mat-tab>
+
+        <mat-tab label="Exceptions">
+          <app-exception-manager
+            [exceptions]="settings()?.exceptions"
+            (add)="onAddException($event)"
+            (remove)="onRemoveException($event)" />
+        </mat-tab>
+
+        <mat-tab label="Alerts">
+          <app-alert-destination-config
+            [settings]="settings()?.alertSettings"
+            (settingsChange)="onAlertSettingsChange($event)" />
+        </mat-tab>
+      </mat-tab-group>
+    </div>
+  `
+})
+export class SecretDetectionSettingsComponent {
+  private settingsService = inject(SecretDetectionSettingsService);
+
+  settings = this.settingsService.settings;
+  availableCategories = this.settingsService.availableCategories;
+
+  // ... handlers
+}
+```
+
+### SDU-003: Revelation Policy Selector
+
+```typescript
+// revelation-policy-config.component.ts
+@Component({
+  selector: 'app-revelation-policy-config',
+  template: `
+    <mat-card>
+      <mat-card-header>
+        <mat-card-title>Secret Revelation Policy</mat-card-title>
+        <mat-card-subtitle>
+          Control how detected secrets are displayed
+        </mat-card-subtitle>
+      </mat-card-header>
+
+      <mat-card-content>
+        <mat-radio-group
+          [value]="policy()?.defaultPolicy"
+          (change)="onDefaultPolicyChange($event)">
+
+          <mat-radio-button value="FullMask">
+            <div class="policy-option">
+              <strong>Full Mask</strong>
+              <span class="example">[REDACTED]</span>
+              <p>No secret value shown. Safest option.</p>
+            </div>
+          </mat-radio-button>
+
+          <mat-radio-button value="PartialReveal">
+            <div class="policy-option">
+              <strong>Partial Reveal</strong>
+              <span class="example">AKIA****WXYZ</span>
+              <p>Show first/last 4 characters. Helps identify specific secrets.</p>
+            </div>
+          </mat-radio-button>
+
+          <mat-radio-button value="FullReveal" [disabled]="!canFullReveal()">
+            <div class="policy-option">
+              <strong>Full Reveal</strong>
+              <span class="example">AKIAIOSFODNN7EXAMPLE</span>
+              <p>Show complete value. Requires security-admin role.</p>
+            </div>
+          </mat-radio-button>
+        </mat-radio-group>
+
+        <mat-divider />
+
+        <h4>Context-Specific Policies</h4>
+        <div class="context-policies">
+          <mat-form-field>
+            <mat-label>Export Reports</mat-label>
+            <mat-select [value]="policy()?.exportPolicy">
+              <mat-option value="FullMask">Full Mask</mat-option>
+              <mat-option value="PartialReveal">Partial Reveal</mat-option>
+            </mat-select>
+          </mat-form-field>
+
+          <mat-form-field>
+            <mat-label>Logs & Telemetry</mat-label>
+            <mat-select [value]="policy()?.logPolicy" disabled>
+              <mat-option value="FullMask">Full Mask (Enforced)</mat-option>
+            </mat-select>
+            <mat-hint>Secrets are never logged in full</mat-hint>
+          </mat-form-field>
+        </div>
+      </mat-card-content>
+    </mat-card>
+  `
+})
+```
+
+### SDU-005: Findings List Component
+
+```typescript
+// secret-findings-list.component.ts
+@Component({
+  selector: 'app-secret-findings-list',
+  template: `
+    <div class="findings-container">
+      <header class="findings-header">
+        <h2>Secret Findings</h2>
+        <div class="filters">
+          <mat-form-field>
+            <mat-label>Severity</mat-label>
+            <mat-select multiple [(value)]="severityFilter">
+              <mat-option value="Critical">Critical</mat-option>
+              <mat-option value="High">High</mat-option>
+              <mat-option value="Medium">Medium</mat-option>
+              <mat-option value="Low">Low</mat-option>
+            </mat-select>
+          </mat-form-field>
+
+          <mat-form-field>
+            <mat-label>Status</mat-label>
+            <mat-select [(value)]="statusFilter">
+              <mat-option value="Open">Open</mat-option>
+              <mat-option value="Dismissed">Dismissed</mat-option>
+              <mat-option value="Excepted">Excepted</mat-option>
+            </mat-select>
+          </mat-form-field>
+        </div>
+      </header>
+
+      <table mat-table [dataSource]="findings()">
+        <ng-container matColumnDef="severity">
+          <th mat-header-cell *matHeaderCellDef>Severity</th>
+          <td mat-cell *matCellDef="let finding">
+            <app-severity-badge [severity]="finding.severity" />
+          </td>
+        </ng-container>
+
+        <ng-container matColumnDef="rule">
+          <th mat-header-cell *matHeaderCellDef>Rule</th>
+          <td mat-cell *matCellDef="let finding">
+            <div class="rule-info">
+              <span class="rule-name">{{ finding.ruleName }}</span>
+              <span class="rule-category">{{ finding.ruleCategory }}</span>
+            </div>
+          </td>
+        </ng-container>
+
+        <ng-container matColumnDef="location">
+          <th mat-header-cell *matHeaderCellDef>Location</th>
+          <td mat-cell *matCellDef="let finding">
+            <code class="file-path">{{ finding.filePath }}:{{ finding.lineNumber }}</code>
+          </td>
+        </ng-container>
+
+        <ng-container matColumnDef="value">
+          <th mat-header-cell *matHeaderCellDef>Detected Value</th>
+          <td mat-cell *matCellDef="let finding">
+            <app-masked-secret-value
+              [value]="finding.value"
+              [policy]="revelationPolicy()"
+              [canReveal]="canRevealSecrets()" />
+          </td>
+        </ng-container>
+
+        <ng-container matColumnDef="actions">
+          <th mat-header-cell *matHeaderCellDef></th>
+          <td mat-cell *matCellDef="let finding">
+            <button mat-icon-button [matMenuTriggerFor]="actionMenu">
+              <mat-icon>more_vert</mat-icon>
+            </button>
+            <mat-menu #actionMenu>
+              <button mat-menu-item (click)="viewDetails(finding)">
+                <mat-icon>visibility</mat-icon>
+                View Details
+              </button>
+              <button mat-menu-item (click)="dismiss(finding)">
+                <mat-icon>cancel</mat-icon>
+                Dismiss
+              </button>
+              <button mat-menu-item (click)="addException(finding)">
+                <mat-icon>playlist_add</mat-icon>
+                Add Exception
+              </button>
+            </mat-menu>
+          </td>
+        </ng-container>
+
+        <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
+        <tr mat-row *matRowDef="let row; columns: displayedColumns"
+            (click)="viewDetails(row)"></tr>
+      </table>
+    </div>
+  `
+})
+```
+
+### SDU-006: Masked Value Display
+
+```typescript
+// masked-secret-value.component.ts
+@Component({
+  selector: 'app-masked-secret-value',
+  template: `
+    <div class="masked-value" [class.revealed]="isRevealed()">
+      <code>{{ displayValue() }}</code>
+
+      @if (canReveal() && !isRevealed()) {
+        <button
+          mat-icon-button
+          matTooltip="Reveal value (logged)"
+          (click)="reveal()">
+          <mat-icon>visibility</mat-icon>
+        </button>
+      }
+
+      @if (isRevealed()) {
+        <button
+          mat-icon-button
+          matTooltip="Hide value"
+          (click)="hide()">
+          <mat-icon>visibility_off</mat-icon>
+        </button>
+        <button
+          mat-icon-button
+          matTooltip="Copy to clipboard"
+          (click)="copy()">
+          <mat-icon>content_copy</mat-icon>
+        </button>
+      }
+    </div>
+  `,
+  styles: [`
+    .masked-value {
+      font-family: monospace;
+      display: flex;
+      align-items: center;
+      gap: 8px;
+    }
+    .revealed code {
+      background: #fff3cd;
+      padding: 4px 8px;
+      border-radius: 4px;
+    }
+  `]
+})
+export class MaskedSecretValueComponent {
+  value = input.required<string>();
+  policy = input.required<SecretRevelationPolicy>();
+  canReveal = input<boolean>(false);
+
+  private revealed = signal(false);
+  isRevealed = computed(() => this.revealed() && this.canReveal());
+
+  displayValue = computed(() => {
+    if (this.isRevealed()) {
+      return this.value();
+    }
+    return this.maskValue(this.value(), this.policy());
+  });
+
+  reveal() {
+    // Log reveal action for audit
+    this.auditService.logSecretReveal(this.value());
+    this.revealed.set(true);
+  }
+
+  hide() {
+    this.revealed.set(false);
+  }
+
+  private maskValue(value: string, policy: SecretRevelationPolicy): string {
+    switch (policy) {
+      case 'FullMask':
+        return '[REDACTED]';
+      case 'PartialReveal':
+        if (value.length <= 8) return '*'.repeat(value.length);
+        return `${value.slice(0, 4)}${'*'.repeat(Math.min(8, value.length - 8))}${value.slice(-4)}`;
+      default:
+        return '[REDACTED]';
+    }
+  }
+}
+```
+
+### SDU-010: Alert Destination Configuration
+
+```typescript
+// alert-destination-config.component.ts
+@Component({
+  selector: 'app-alert-destination-config',
+  template: `
+    <mat-card>
+      <mat-card-header>
+        <mat-card-title>Alert Destinations</mat-card-title>
+      </mat-card-header>
+
+      <mat-card-content>
+        <div class="alert-settings">
+          <mat-slide-toggle [(ngModel)]="settings().enabled">
+            Enable Alerts
+          </mat-slide-toggle>
+
+          <mat-form-field>
+            <mat-label>Minimum Severity</mat-label>
+            <mat-select [(value)]="settings().minimumAlertSeverity">
+              <mat-option value="Critical">Critical only</mat-option>
+              <mat-option value="High">High and above</mat-option>
+              <mat-option value="Medium">Medium and above</mat-option>
+              <mat-option value="Low">All findings</mat-option>
+            </mat-select>
+          </mat-form-field>
+        </div>
+
+        <mat-divider />
+
+        <h4>Configured Channels</h4>
+        <div class="destinations-list">
+          @for (dest of settings().destinations; track dest.id) {
+            <mat-card class="destination-card">
+              <div class="destination-info">
+                <mat-icon>{{ getChannelIcon(dest.channelType) }}</mat-icon>
+                <span>{{ dest.channelType }}</span>
+                <code>{{ dest.channelId }}</code>
+              </div>
+              <div class="destination-actions">
+                <button mat-icon-button (click)="testChannel(dest)">
+                  <mat-icon>send</mat-icon>
+                </button>
+                <button mat-icon-button color="warn" (click)="removeDestination(dest)">
+                  <mat-icon>delete</mat-icon>
+                </button>
+              </div>
+            </mat-card>
+          }
+        </div>
+
+        <button mat-stroked-button (click)="addDestination()">
+          <mat-icon>add</mat-icon>
+          Add Destination
+        </button>
+      </mat-card-content>
+    </mat-card>
+  `
+})
+```
+
+## UI Mockups
+
+### Settings Page Layout
+```
+┌─────────────────────────────────────────────────────────────┐
+│ Secret Detection                            [Enabled ●]     │
+├─────────────────────────────────────────────────────────────┤
+│ [General] [Exceptions] [Alerts]                             │
+├─────────────────────────────────────────────────────────────┤
+│                                                             │
+│  ┌─ Revelation Policy ─────────────────────────────────┐   │
+│  │ ○ Full Mask      [REDACTED]                         │   │
+│  │ ● Partial Reveal AKIA****WXYZ                       │   │
+│  │ ○ Full Reveal    (requires security-admin)          │   │
+│  └─────────────────────────────────────────────────────┘   │
+│                                                             │
+│  ┌─ Rule Categories ───────────────────────────────────┐   │
+│  │ ☑ AWS Credentials    ☑ GCP Service Accounts         │   │
+│  │ ☑ Generic API Keys   ☑ Private Keys                 │   │
+│  │ ☐ Internal Tokens    ☑ Database Credentials         │   │
+│  └─────────────────────────────────────────────────────┘   │
+│                                                             │
+└─────────────────────────────────────────────────────────────┘
+```
+
+### Findings List
+```
+┌─────────────────────────────────────────────────────────────┐
+│ Secret Findings                                             │
+│ Severity: [All ▼]  Status: [Open ▼]  Image: [All ▼]        │
+├─────────────────────────────────────────────────────────────┤
+│ SEV │ RULE              │ LOCATION           │ VALUE       │
+├─────────────────────────────────────────────────────────────┤
+│ 🔴  │ AWS Access Key    │ config.yaml:42     │ AKIA****XYZ │
+│ 🟠  │ Generic API Key   │ .env:15            │ sk_l****abc │
+│ 🟡  │ Private Key       │ certs/server.key   │ [REDACTED]  │
+└─────────────────────────────────────────────────────────────┘
+```
+
+## Directory Structure
+
+```
+src/Web/StellaOps.Web/src/app/
+├── features/
+│   └── secret-detection/
+│       ├── secret-detection.module.ts
+│       ├── secret-detection.routes.ts
+│       ├── pages/
+│       │   ├── settings/
+│       │   │   └── secret-detection-settings.component.ts
+│       │   └── findings/
+│       │       └── secret-findings-list.component.ts
+│       ├── components/
+│       │   ├── revelation-policy-config/
+│       │   ├── rule-category-selector/
+│       │   ├── exception-manager/
+│       │   ├── alert-destination-config/
+│       │   ├── masked-secret-value/
+│       │   └── finding-detail-drawer/
+│       └── services/
+│           ├── secret-detection-settings.service.ts
+│           └── secret-findings.service.ts
+```
+
+## Decisions & Risks
+
+| Decision | Rationale |
+|----------|-----------|
+| Angular Material | Consistent with existing UI |
+| Signal-based state | Modern Angular patterns |
+| Audit logging on reveal | Compliance requirement |
+| Lazy-loaded module | Performance optimization |
+
+## Execution Log
+
+| Date | Action | Notes |
+|------|--------|-------|
+| 2026-01-04 | Sprint created | UI components for secret detection |
+
diff --git a/src/AirGap/StellaOps.AirGap.Importer/Policy/OfflineVerificationPolicy.cs b/src/AirGap/StellaOps.AirGap.Importer/Policy/OfflineVerificationPolicy.cs
index 548700aa6..c3345d812 100644
--- a/src/AirGap/StellaOps.AirGap.Importer/Policy/OfflineVerificationPolicy.cs
+++ b/src/AirGap/StellaOps.AirGap.Importer/Policy/OfflineVerificationPolicy.cs
@@ -43,6 +43,7 @@ public sealed record OfflineVerificationPolicy
         return values
             .Select(static value => value?.Trim())
             .Where(static value => !string.IsNullOrWhiteSpace(value))
+            .Select(static value => value!)
             .Distinct(StringComparer.OrdinalIgnoreCase)
             .OrderBy(static value => value, StringComparer.OrdinalIgnoreCase)
             .ToArray();
@@ -203,6 +204,7 @@ public sealed record OfflineCertConstraints
         return values
             .Select(static value => value?.Trim())
             .Where(static value => !string.IsNullOrWhiteSpace(value))
+            .Select(static value => value!)
             .Distinct(StringComparer.OrdinalIgnoreCase)
             .OrderBy(static value => value, StringComparer.OrdinalIgnoreCase)
             .ToArray();
diff --git a/src/AirGap/StellaOps.AirGap.Importer/Reconciliation/JsonNormalizer.cs b/src/AirGap/StellaOps.AirGap.Importer/Reconciliation/JsonNormalizer.cs
index 7d58e8555..42438e62a 100644
--- a/src/AirGap/StellaOps.AirGap.Importer/Reconciliation/JsonNormalizer.cs
+++ b/src/AirGap/StellaOps.AirGap.Importer/Reconciliation/JsonNormalizer.cs
@@ -41,7 +41,7 @@ public static class JsonNormalizer
         }
 
         var normalized = NormalizeNode(node, options);
-        return normalized.ToJsonString(SerializerOptions);
+        return normalized?.ToJsonString(SerializerOptions) ?? "null";
     }
 
     /// <summary>
diff --git a/src/AirGap/StellaOps.AirGap.Importer/Reconciliation/Parsers/SbomNormalizer.cs b/src/AirGap/StellaOps.AirGap.Importer/Reconciliation/Parsers/SbomNormalizer.cs
index d8fd92be1..33ac193d8 100644
--- a/src/AirGap/StellaOps.AirGap.Importer/Reconciliation/Parsers/SbomNormalizer.cs
+++ b/src/AirGap/StellaOps.AirGap.Importer/Reconciliation/Parsers/SbomNormalizer.cs
@@ -128,7 +128,8 @@ public sealed class SbomNormalizer
     /// </summary>
     private JsonNode NormalizeGeneric(JsonNode node)
     {
-        return NormalizeNode(node);
+        // NormalizeNode only returns null if input is null; node is non-null here
+        return NormalizeNode(node)!;
     }
 
     /// <summary>
diff --git a/src/AirGap/StellaOps.AirGap.Importer/Validation/RuleBundleValidator.cs b/src/AirGap/StellaOps.AirGap.Importer/Validation/RuleBundleValidator.cs
new file mode 100644
index 000000000..d82fd8e51
--- /dev/null
+++ b/src/AirGap/StellaOps.AirGap.Importer/Validation/RuleBundleValidator.cs
@@ -0,0 +1,344 @@
+// -----------------------------------------------------------------------------
+// RuleBundleValidator.cs
+// Sprint: SPRINT_20260104_005_AIRGAP (Secret Offline Kit Integration)
+// Task: OKS-003 - Create bundle verification in Importer
+// Description: Validates rule bundles (secrets, malware, etc.) for offline import.
+// -----------------------------------------------------------------------------
+
+using System.Security.Cryptography;
+using System.Text.Json;
+using Microsoft.Extensions.Logging;
+using StellaOps.AirGap.Importer.Contracts;
+using StellaOps.AirGap.Importer.Telemetry;
+using StellaOps.AirGap.Importer.Versioning;
+
+namespace StellaOps.AirGap.Importer.Validation;
+
+/// <summary>
+/// Validates rule bundles (secrets, malware, etc.) for offline import.
+/// Verifies signature, version monotonicity, and file digests.
+/// </summary>
+public sealed class RuleBundleValidator
+{
+    private readonly DsseVerifier _dsseVerifier;
+    private readonly IVersionMonotonicityChecker _monotonicityChecker;
+    private readonly ILogger<RuleBundleValidator> _logger;
+
+    public RuleBundleValidator(
+        DsseVerifier dsseVerifier,
+        IVersionMonotonicityChecker monotonicityChecker,
+        ILogger<RuleBundleValidator> logger)
+    {
+        _dsseVerifier = dsseVerifier ?? throw new ArgumentNullException(nameof(dsseVerifier));
+        _monotonicityChecker = monotonicityChecker ?? throw new ArgumentNullException(nameof(monotonicityChecker));
+        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+    }
+
+    /// <summary>
+    /// Validates a rule bundle for import.
+    /// </summary>
+    public async Task<RuleBundleValidationResult> ValidateAsync(
+        RuleBundleValidationRequest request,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        ArgumentException.ThrowIfNullOrWhiteSpace(request.TenantId);
+        ArgumentException.ThrowIfNullOrWhiteSpace(request.BundleId);
+        ArgumentException.ThrowIfNullOrWhiteSpace(request.BundleType);
+        ArgumentException.ThrowIfNullOrWhiteSpace(request.Version);
+        ArgumentException.ThrowIfNullOrWhiteSpace(request.BundleDirectory);
+
+        using var tenantScope = _logger.BeginTenantScope(request.TenantId);
+        var verificationLog = new List<string>(capacity: 8);
+
+        // Verify manifest file exists
+        var manifestPath = Path.Combine(request.BundleDirectory, $"{request.BundleId}.manifest.json");
+        if (!File.Exists(manifestPath))
+        {
+            var reason = $"manifest-not-found:{manifestPath}";
+            verificationLog.Add(reason);
+            _logger.LogWarning(
+                "offlinekit.rulebundle.validation failed tenant_id={tenant_id} bundle_id={bundle_id} reason={reason}",
+                request.TenantId,
+                request.BundleId,
+                reason);
+            return RuleBundleValidationResult.Failure(reason, verificationLog);
+        }
+
+        // Read and parse manifest
+        string manifestJson;
+        RuleBundleManifest? manifest;
+        try
+        {
+            manifestJson = await File.ReadAllTextAsync(manifestPath, cancellationToken);
+            manifest = JsonSerializer.Deserialize<RuleBundleManifest>(manifestJson, JsonOptions);
+            if (manifest is null)
+            {
+                var reason = "manifest-parse-failed:null";
+                verificationLog.Add(reason);
+                return RuleBundleValidationResult.Failure(reason, verificationLog);
+            }
+        }
+        catch (Exception ex)
+        {
+            var reason = $"manifest-parse-failed:{ex.GetType().Name.ToLowerInvariant()}";
+            verificationLog.Add(reason);
+            _logger.LogWarning(
+                ex,
+                "offlinekit.rulebundle.validation failed tenant_id={tenant_id} bundle_id={bundle_id} reason={reason}",
+                request.TenantId,
+                request.BundleId,
+                reason);
+            return RuleBundleValidationResult.Failure(reason, verificationLog);
+        }
+
+        // Verify signature if envelope provided
+        if (request.SignatureEnvelope is not null)
+        {
+            var signatureResult = _dsseVerifier.Verify(request.SignatureEnvelope, request.TrustRoots, _logger);
+            if (!signatureResult.IsValid)
+            {
+                var reason = $"signature-invalid:{signatureResult.Reason}";
+                verificationLog.Add(reason);
+                _logger.LogWarning(
+                    "offlinekit.rulebundle.validation failed tenant_id={tenant_id} bundle_id={bundle_id} reason={reason}",
+                    request.TenantId,
+                    request.BundleId,
+                    reason);
+                return RuleBundleValidationResult.Failure(reason, verificationLog);
+            }
+            verificationLog.Add($"signature:verified");
+        }
+        else if (request.RequireSignature)
+        {
+            var reason = "signature-required-but-missing";
+            verificationLog.Add(reason);
+            _logger.LogWarning(
+                "offlinekit.rulebundle.validation failed tenant_id={tenant_id} bundle_id={bundle_id} reason={reason}",
+                request.TenantId,
+                request.BundleId,
+                reason);
+            return RuleBundleValidationResult.Failure(reason, verificationLog);
+        }
+
+        // Verify file digests
+        var digestErrors = new List<string>();
+        foreach (var file in manifest.Files)
+        {
+            var filePath = Path.Combine(request.BundleDirectory, file.Name);
+            if (!File.Exists(filePath))
+            {
+                digestErrors.Add($"file-missing:{file.Name}");
+                continue;
+            }
+
+            var actualDigest = await ComputeFileDigestAsync(filePath, cancellationToken);
+            if (!string.Equals(actualDigest, file.Digest, StringComparison.OrdinalIgnoreCase))
+            {
+                digestErrors.Add($"digest-mismatch:{file.Name}:expected={file.Digest}:actual={actualDigest}");
+            }
+        }
+
+        if (digestErrors.Count > 0)
+        {
+            var reason = string.Join(";", digestErrors);
+            verificationLog.Add(reason);
+            _logger.LogWarning(
+                "offlinekit.rulebundle.validation failed tenant_id={tenant_id} bundle_id={bundle_id} reason={reason}",
+                request.TenantId,
+                request.BundleId,
+                reason);
+            return RuleBundleValidationResult.Failure(reason, verificationLog);
+        }
+        verificationLog.Add($"digests:verified:{manifest.Files.Count}");
+
+        // Verify version monotonicity (CalVer format YYYY.MM)
+        var bundleVersionKey = $"rulebundle:{request.BundleType}:{request.BundleId}";
+        BundleVersion incomingVersion;
+        try
+        {
+            incomingVersion = BundleVersion.Parse(request.Version, request.CreatedAt ?? DateTimeOffset.UtcNow);
+        }
+        catch (Exception ex)
+        {
+            var reason = $"version-parse-failed:{ex.GetType().Name.ToLowerInvariant()}";
+            verificationLog.Add(reason);
+            _logger.LogWarning(
+                ex,
+                "offlinekit.rulebundle.validation failed tenant_id={tenant_id} bundle_id={bundle_id} reason={reason}",
+                request.TenantId,
+                request.BundleId,
+                reason);
+            return RuleBundleValidationResult.Failure(reason, verificationLog);
+        }
+
+        var monotonicity = await _monotonicityChecker.CheckAsync(
+            request.TenantId,
+            bundleVersionKey,
+            incomingVersion,
+            cancellationToken);
+
+        if (!monotonicity.IsMonotonic && !request.ForceActivate)
+        {
+            var reason = $"version-non-monotonic:incoming={incomingVersion.SemVer}:current={monotonicity.CurrentVersion?.SemVer ?? "(none)"}";
+            verificationLog.Add(reason);
+            _logger.LogWarning(
+                "offlinekit.rulebundle.validation failed tenant_id={tenant_id} bundle_id={bundle_id} reason={reason}",
+                request.TenantId,
+                request.BundleId,
+                reason);
+            return RuleBundleValidationResult.Failure(reason, verificationLog);
+        }
+
+        if (!monotonicity.IsMonotonic && request.ForceActivate)
+        {
+            _logger.LogWarning(
+                "offlinekit.rulebundle.force_activation tenant_id={tenant_id} bundle_id={bundle_id} incoming_version={incoming_version} current_version={current_version} reason={reason}",
+                request.TenantId,
+                request.BundleId,
+                incomingVersion.SemVer,
+                monotonicity.CurrentVersion?.SemVer,
+                request.ForceActivateReason);
+        }
+
+        verificationLog.Add($"version:monotonic:{incomingVersion.SemVer}");
+
+        // Record activation
+        try
+        {
+            var combinedDigest = ComputeCombinedDigest(manifest.Files);
+            await _monotonicityChecker.RecordActivationAsync(
+                request.TenantId,
+                bundleVersionKey,
+                incomingVersion,
+                combinedDigest,
+                request.ForceActivate,
+                request.ForceActivateReason,
+                cancellationToken);
+        }
+        catch (Exception ex)
+        {
+            var reason = $"version-store-write-failed:{ex.GetType().Name.ToLowerInvariant()}";
+            verificationLog.Add(reason);
+            _logger.LogError(
+                ex,
+                "offlinekit.rulebundle.activation failed tenant_id={tenant_id} bundle_id={bundle_id}",
+                request.TenantId,
+                request.BundleId);
+            return RuleBundleValidationResult.Failure(reason, verificationLog);
+        }
+
+        _logger.LogInformation(
+            "offlinekit.rulebundle.validation succeeded tenant_id={tenant_id} bundle_id={bundle_id} bundle_type={bundle_type} version={version} rule_count={rule_count}",
+            request.TenantId,
+            request.BundleId,
+            request.BundleType,
+            request.Version,
+            manifest.RuleCount);
+
+        return RuleBundleValidationResult.Success(
+            "rulebundle-validated",
+            verificationLog,
+            manifest.RuleCount,
+            manifest.SignerKeyId);
+    }
+
+    private static async Task<string> ComputeFileDigestAsync(string filePath, CancellationToken ct)
+    {
+        await using var stream = File.OpenRead(filePath);
+        var hash = await SHA256.HashDataAsync(stream, ct);
+        return $"sha256:{Convert.ToHexString(hash).ToLowerInvariant()}";
+    }
+
+    private static string ComputeCombinedDigest(IReadOnlyList<RuleBundleFileEntry> files)
+    {
+        var sortedDigests = files
+            .OrderBy(f => f.Name, StringComparer.Ordinal)
+            .Select(f => f.Digest)
+            .ToArray();
+
+        var combined = string.Join(":", sortedDigests);
+        var hash = SHA256.HashData(System.Text.Encoding.UTF8.GetBytes(combined));
+        return $"sha256:{Convert.ToHexString(hash).ToLowerInvariant()}";
+    }
+
+    private static readonly JsonSerializerOptions JsonOptions = new()
+    {
+        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+        PropertyNameCaseInsensitive = true
+    };
+}
+
+/// <summary>
+/// Request for validating a rule bundle.
+/// </summary>
+public sealed record RuleBundleValidationRequest(
+    string TenantId,
+    string BundleId,
+    string BundleType,
+    string Version,
+    string BundleDirectory,
+    DateTimeOffset? CreatedAt,
+    DsseEnvelope? SignatureEnvelope,
+    TrustRootConfig TrustRoots,
+    bool RequireSignature,
+    bool ForceActivate,
+    string? ForceActivateReason);
+
+/// <summary>
+/// Result of rule bundle validation.
+/// </summary>
+public sealed record RuleBundleValidationResult
+{
+    public bool IsValid { get; init; }
+    public string Reason { get; init; } = string.Empty;
+    public IReadOnlyList<string> VerificationLog { get; init; } = [];
+    public int RuleCount { get; init; }
+    public string? SignerKeyId { get; init; }
+
+    public static RuleBundleValidationResult Success(
+        string reason,
+        IReadOnlyList<string> verificationLog,
+        int ruleCount,
+        string? signerKeyId) => new()
+    {
+        IsValid = true,
+        Reason = reason,
+        VerificationLog = verificationLog,
+        RuleCount = ruleCount,
+        SignerKeyId = signerKeyId
+    };
+
+    public static RuleBundleValidationResult Failure(
+        string reason,
+        IReadOnlyList<string> verificationLog) => new()
+    {
+        IsValid = false,
+        Reason = reason,
+        VerificationLog = verificationLog
+    };
+}
+
+/// <summary>
+/// Manifest for a rule bundle.
+/// </summary>
+internal sealed class RuleBundleManifest
+{
+    public string BundleId { get; set; } = string.Empty;
+    public string BundleType { get; set; } = string.Empty;
+    public string Version { get; set; } = string.Empty;
+    public int RuleCount { get; set; }
+    public string? SignerKeyId { get; set; }
+    public DateTimeOffset? SignedAt { get; set; }
+    public List<RuleBundleFileEntry> Files { get; set; } = [];
+}
+
+/// <summary>
+/// File entry in a rule bundle manifest.
+/// </summary>
+internal sealed class RuleBundleFileEntry
+{
+    public string Name { get; set; } = string.Empty;
+    public string Digest { get; set; } = string.Empty;
+    public long SizeBytes { get; set; }
+}
diff --git a/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Models/BundleManifest.cs b/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Models/BundleManifest.cs
index a0ea7f40d..e9fafbfa5 100644
--- a/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Models/BundleManifest.cs
+++ b/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Models/BundleManifest.cs
@@ -20,6 +20,7 @@ public sealed record BundleManifest
     public ImmutableArray<CatalogComponent> Catalogs { get; init; } = [];
     public RekorSnapshot? RekorSnapshot { get; init; }
     public ImmutableArray<CryptoProviderComponent> CryptoProviders { get; init; } = [];
+    public ImmutableArray<RuleBundleComponent> RuleBundles { get; init; } = [];
     public long TotalSizeBytes { get; init; }
     public string? BundleDigest { get; init; }
 }
@@ -102,3 +103,39 @@ public sealed record CryptoProviderComponent(
     string Digest,
     long SizeBytes,
     ImmutableArray<string> SupportedAlgorithms);
+
+/// <summary>
+/// Component for a rule bundle (e.g., secrets detection rules).
+/// </summary>
+/// <param name="BundleId">Bundle identifier (e.g., "secrets.ruleset").</param>
+/// <param name="BundleType">Bundle type (e.g., "secrets", "malware").</param>
+/// <param name="Version">Bundle version in YYYY.MM format.</param>
+/// <param name="RelativePath">Relative path to the bundle directory.</param>
+/// <param name="Digest">Combined digest of all files in the bundle.</param>
+/// <param name="SizeBytes">Total size of the bundle in bytes.</param>
+/// <param name="RuleCount">Number of rules in the bundle.</param>
+/// <param name="SignerKeyId">Key ID used to sign the bundle.</param>
+/// <param name="SignedAt">When the bundle was signed.</param>
+/// <param name="Files">List of files in the bundle.</param>
+public sealed record RuleBundleComponent(
+    string BundleId,
+    string BundleType,
+    string Version,
+    string RelativePath,
+    string Digest,
+    long SizeBytes,
+    int RuleCount,
+    string? SignerKeyId,
+    DateTimeOffset? SignedAt,
+    ImmutableArray<RuleBundleFileComponent> Files);
+
+/// <summary>
+/// A file within a rule bundle component.
+/// </summary>
+/// <param name="Name">Filename (e.g., "secrets.ruleset.manifest.json").</param>
+/// <param name="Digest">SHA256 digest of the file.</param>
+/// <param name="SizeBytes">File size in bytes.</param>
+public sealed record RuleBundleFileComponent(
+    string Name,
+    string Digest,
+    long SizeBytes);
diff --git a/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Models/KnowledgeSnapshotManifest.cs b/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Models/KnowledgeSnapshotManifest.cs
index 54b287b7b..f06f01949 100644
--- a/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Models/KnowledgeSnapshotManifest.cs
+++ b/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Models/KnowledgeSnapshotManifest.cs
@@ -25,6 +25,7 @@ public sealed class KnowledgeSnapshotManifest
     public List<VexSnapshotEntry> VexStatements { get; init; } = [];
     public List<PolicySnapshotEntry> Policies { get; init; } = [];
     public List<TrustRootSnapshotEntry> TrustRoots { get; init; } = [];
+    public List<RuleBundleSnapshotEntry> RuleBundles { get; init; } = [];
     public TimeAnchorEntry? TimeAnchor { get; set; }
 }
 
@@ -81,6 +82,79 @@ public sealed class TrustRootSnapshotEntry
     public DateTimeOffset? ExpiresAt { get; init; }
 }
 
+/// <summary>
+/// Entry for a rule bundle in the snapshot.
+/// Used for detection rule bundles (secrets, malware, etc.).
+/// </summary>
+public sealed class RuleBundleSnapshotEntry
+{
+    /// <summary>
+    /// Bundle identifier (e.g., "secrets.ruleset").
+    /// </summary>
+    public required string BundleId { get; init; }
+
+    /// <summary>
+    /// Bundle type (e.g., "secrets", "malware").
+    /// </summary>
+    public required string BundleType { get; init; }
+
+    /// <summary>
+    /// Bundle version in YYYY.MM format.
+    /// </summary>
+    public required string Version { get; init; }
+
+    /// <summary>
+    /// Relative path to the bundle directory in the snapshot.
+    /// </summary>
+    public required string RelativePath { get; init; }
+
+    /// <summary>
+    /// List of files in the bundle with their digests.
+    /// </summary>
+    public required List<RuleBundleFile> Files { get; init; }
+
+    /// <summary>
+    /// Number of rules in the bundle.
+    /// </summary>
+    public int RuleCount { get; init; }
+
+    /// <summary>
+    /// Key ID used to sign the bundle.
+    /// </summary>
+    public string? SignerKeyId { get; init; }
+
+    /// <summary>
+    /// When the bundle was signed.
+    /// </summary>
+    public DateTimeOffset? SignedAt { get; init; }
+
+    /// <summary>
+    /// When the bundle signature was verified during export.
+    /// </summary>
+    public DateTimeOffset? VerifiedAt { get; init; }
+}
+
+/// <summary>
+/// A file within a rule bundle.
+/// </summary>
+public sealed class RuleBundleFile
+{
+    /// <summary>
+    /// Filename (e.g., "secrets.ruleset.manifest.json").
+    /// </summary>
+    public required string Name { get; init; }
+
+    /// <summary>
+    /// SHA256 digest of the file.
+    /// </summary>
+    public required string Digest { get; init; }
+
+    /// <summary>
+    /// File size in bytes.
+    /// </summary>
+    public required long SizeBytes { get; init; }
+}
+
 /// <summary>
 /// Time anchor entry in the manifest.
 /// </summary>
diff --git a/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Services/BundleBuilder.cs b/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Services/BundleBuilder.cs
index 3f2320b52..a361df54d 100644
--- a/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Services/BundleBuilder.cs
+++ b/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Services/BundleBuilder.cs
@@ -81,9 +81,64 @@ public sealed class BundleBuilder : IBundleBuilder
                 cryptoConfig.ExpiresAt));
         }
 
+        var ruleBundles = new List<RuleBundleComponent>();
+        foreach (var ruleBundleConfig in request.RuleBundles)
+        {
+            // Validate relative path before combining
+            var targetDir = PathValidation.SafeCombine(outputPath, ruleBundleConfig.RelativePath);
+            Directory.CreateDirectory(targetDir);
+
+            var files = new List<RuleBundleFileComponent>();
+            long bundleTotalSize = 0;
+            var digestBuilder = new System.Text.StringBuilder();
+
+            // Copy all files from source directory
+            if (Directory.Exists(ruleBundleConfig.SourceDirectory))
+            {
+                foreach (var sourceFile in Directory.GetFiles(ruleBundleConfig.SourceDirectory)
+                    .OrderBy(f => Path.GetFileName(f), StringComparer.Ordinal))
+                {
+                    var fileName = Path.GetFileName(sourceFile);
+                    var targetFile = Path.Combine(targetDir, fileName);
+
+                    await using (var input = File.OpenRead(sourceFile))
+                    await using (var output = File.Create(targetFile))
+                    {
+                        await input.CopyToAsync(output, ct).ConfigureAwait(false);
+                    }
+
+                    await using var digestStream = File.OpenRead(targetFile);
+                    var hash = await SHA256.HashDataAsync(digestStream, ct).ConfigureAwait(false);
+                    var fileDigest = Convert.ToHexString(hash).ToLowerInvariant();
+
+                    var fileInfo = new FileInfo(targetFile);
+                    files.Add(new RuleBundleFileComponent(fileName, fileDigest, fileInfo.Length));
+                    bundleTotalSize += fileInfo.Length;
+                    digestBuilder.Append(fileDigest);
+                }
+            }
+
+            // Compute combined digest from all file digests
+            var combinedDigest = Convert.ToHexString(
+                SHA256.HashData(System.Text.Encoding.UTF8.GetBytes(digestBuilder.ToString()))).ToLowerInvariant();
+
+            ruleBundles.Add(new RuleBundleComponent(
+                ruleBundleConfig.BundleId,
+                ruleBundleConfig.BundleType,
+                ruleBundleConfig.Version,
+                ruleBundleConfig.RelativePath,
+                combinedDigest,
+                bundleTotalSize,
+                ruleBundleConfig.RuleCount,
+                ruleBundleConfig.SignerKeyId,
+                ruleBundleConfig.SignedAt,
+                files.ToImmutableArray()));
+        }
+
         var totalSize = feeds.Sum(f => f.SizeBytes) +
                         policies.Sum(p => p.SizeBytes) +
-                        cryptoMaterials.Sum(c => c.SizeBytes);
+                        cryptoMaterials.Sum(c => c.SizeBytes) +
+                        ruleBundles.Sum(r => r.SizeBytes);
 
         var manifest = new BundleManifest
         {
@@ -96,6 +151,7 @@ public sealed class BundleBuilder : IBundleBuilder
             Feeds = feeds.ToImmutableArray(),
             Policies = policies.ToImmutableArray(),
             CryptoMaterials = cryptoMaterials.ToImmutableArray(),
+            RuleBundles = ruleBundles.ToImmutableArray(),
             TotalSizeBytes = totalSize
         };
 
@@ -138,7 +194,8 @@ public sealed record BundleBuildRequest(
     DateTimeOffset? ExpiresAt,
     IReadOnlyList<FeedBuildConfig> Feeds,
     IReadOnlyList<PolicyBuildConfig> Policies,
-    IReadOnlyList<CryptoBuildConfig> CryptoMaterials);
+    IReadOnlyList<CryptoBuildConfig> CryptoMaterials,
+    IReadOnlyList<RuleBundleBuildConfig> RuleBundles);
 
 public abstract record BundleComponentSource(string SourcePath, string RelativePath);
 
@@ -169,3 +226,24 @@ public sealed record CryptoBuildConfig(
     CryptoComponentType Type,
     DateTimeOffset? ExpiresAt)
     : BundleComponentSource(SourcePath, RelativePath);
+
+/// <summary>
+/// Configuration for building a rule bundle component.
+/// </summary>
+/// <param name="BundleId">Bundle identifier (e.g., "secrets.ruleset").</param>
+/// <param name="BundleType">Bundle type (e.g., "secrets", "malware").</param>
+/// <param name="Version">Bundle version in YYYY.MM format.</param>
+/// <param name="SourceDirectory">Source directory containing the rule bundle files.</param>
+/// <param name="RelativePath">Relative path in the output bundle.</param>
+/// <param name="RuleCount">Number of rules in the bundle.</param>
+/// <param name="SignerKeyId">Key ID used to sign the bundle.</param>
+/// <param name="SignedAt">When the bundle was signed.</param>
+public sealed record RuleBundleBuildConfig(
+    string BundleId,
+    string BundleType,
+    string Version,
+    string SourceDirectory,
+    string RelativePath,
+    int RuleCount,
+    string? SignerKeyId,
+    DateTimeOffset? SignedAt);
diff --git a/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Services/SnapshotBundleReader.cs b/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Services/SnapshotBundleReader.cs
index 77d6950be..9a7c9044a 100644
--- a/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Services/SnapshotBundleReader.cs
+++ b/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Services/SnapshotBundleReader.cs
@@ -408,6 +408,38 @@ public sealed class SnapshotBundleReader : ISnapshotBundleReader
                 entries.Add(new BundleEntry(trust.RelativePath, digest, content.Length));
             }
 
+            foreach (var ruleBundle in manifest.RuleBundles)
+            {
+                // Verify each file in the rule bundle
+                foreach (var file in ruleBundle.Files)
+                {
+                    var relativePath = $"{ruleBundle.RelativePath}/{file.Name}";
+                    var filePath = Path.Combine(bundleDir, relativePath.Replace('/', Path.DirectorySeparatorChar));
+                    if (!File.Exists(filePath))
+                    {
+                        return new MerkleVerificationResult
+                        {
+                            Verified = false,
+                            Error = $"Missing rule bundle file: {relativePath}"
+                        };
+                    }
+
+                    var content = await File.ReadAllBytesAsync(filePath, cancellationToken);
+                    var digest = ComputeSha256(content);
+
+                    if (digest != file.Digest)
+                    {
+                        return new MerkleVerificationResult
+                        {
+                            Verified = false,
+                            Error = $"Digest mismatch for rule bundle file {relativePath}"
+                        };
+                    }
+
+                    entries.Add(new BundleEntry(relativePath, digest, content.Length));
+                }
+            }
+
             // Compute merkle root
             var computedRoot = ComputeMerkleRoot(entries);
 
diff --git a/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Services/SnapshotBundleWriter.cs b/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Services/SnapshotBundleWriter.cs
index 4c4ca374c..db3b74365 100644
--- a/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Services/SnapshotBundleWriter.cs
+++ b/src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Services/SnapshotBundleWriter.cs
@@ -186,6 +186,52 @@ public sealed class SnapshotBundleWriter : ISnapshotBundleWriter
                 }
             }
 
+            // Write rule bundles
+            if (request.RuleBundles is { Count: > 0 })
+            {
+                var rulesDir = Path.Combine(tempDir, "rules");
+                Directory.CreateDirectory(rulesDir);
+
+                foreach (var ruleBundle in request.RuleBundles)
+                {
+                    var bundleDir = Path.Combine(rulesDir, ruleBundle.BundleId);
+                    Directory.CreateDirectory(bundleDir);
+
+                    var bundleFiles = new List<RuleBundleFile>();
+                    var bundleRelativePath = $"rules/{ruleBundle.BundleId}";
+
+                    foreach (var file in ruleBundle.Files)
+                    {
+                        var filePath = Path.Combine(bundleDir, file.Name);
+                        await File.WriteAllBytesAsync(filePath, file.Content, cancellationToken);
+
+                        var relativePath = $"{bundleRelativePath}/{file.Name}";
+                        var digest = ComputeSha256(file.Content);
+
+                        entries.Add(new BundleEntry(relativePath, digest, file.Content.Length));
+                        bundleFiles.Add(new RuleBundleFile
+                        {
+                            Name = file.Name,
+                            Digest = digest,
+                            SizeBytes = file.Content.Length
+                        });
+                    }
+
+                    manifest.RuleBundles.Add(new RuleBundleSnapshotEntry
+                    {
+                        BundleId = ruleBundle.BundleId,
+                        BundleType = ruleBundle.BundleType,
+                        Version = ruleBundle.Version,
+                        RelativePath = bundleRelativePath,
+                        Files = bundleFiles,
+                        RuleCount = ruleBundle.RuleCount,
+                        SignerKeyId = ruleBundle.SignerKeyId,
+                        SignedAt = ruleBundle.SignedAt,
+                        VerifiedAt = ruleBundle.VerifiedAt
+                    });
+                }
+            }
+
             // Write time anchor
             if (request.TimeAnchor is not null)
             {
@@ -389,6 +435,7 @@ public sealed record SnapshotBundleRequest
     public List<VexContent> VexStatements { get; init; } = [];
     public List<PolicyContent> Policies { get; init; } = [];
     public List<TrustRootContent> TrustRoots { get; init; } = [];
+    public List<RuleBundleContent> RuleBundles { get; init; } = [];
     public TimeAnchorContent? TimeAnchor { get; init; }
 
     /// <summary>
@@ -445,6 +492,68 @@ public sealed record TrustRootContent
     public DateTimeOffset? ExpiresAt { get; init; }
 }
 
+/// <summary>
+/// Content for a rule bundle (e.g., secrets detection rules).
+/// </summary>
+public sealed record RuleBundleContent
+{
+    /// <summary>
+    /// Bundle identifier (e.g., "secrets.ruleset").
+    /// </summary>
+    public required string BundleId { get; init; }
+
+    /// <summary>
+    /// Bundle type (e.g., "secrets", "malware").
+    /// </summary>
+    public required string BundleType { get; init; }
+
+    /// <summary>
+    /// Bundle version in YYYY.MM format.
+    /// </summary>
+    public required string Version { get; init; }
+
+    /// <summary>
+    /// Files in the bundle.
+    /// </summary>
+    public required List<RuleBundleFileContent> Files { get; init; }
+
+    /// <summary>
+    /// Number of rules in the bundle.
+    /// </summary>
+    public int RuleCount { get; init; }
+
+    /// <summary>
+    /// Key ID used to sign the bundle.
+    /// </summary>
+    public string? SignerKeyId { get; init; }
+
+    /// <summary>
+    /// When the bundle was signed.
+    /// </summary>
+    public DateTimeOffset? SignedAt { get; init; }
+
+    /// <summary>
+    /// When the bundle signature was verified during export.
+    /// </summary>
+    public DateTimeOffset? VerifiedAt { get; init; }
+}
+
+/// <summary>
+/// A file within a rule bundle.
+/// </summary>
+public sealed record RuleBundleFileContent
+{
+    /// <summary>
+    /// Filename (e.g., "secrets.ruleset.manifest.json").
+    /// </summary>
+    public required string Name { get; init; }
+
+    /// <summary>
+    /// File content.
+    /// </summary>
+    public required byte[] Content { get; init; }
+}
+
 public sealed record TimeAnchorContent
 {
     public required DateTimeOffset AnchorTime { get; init; }
diff --git a/src/AirGap/__Tests/StellaOps.AirGap.Importer.Tests/Validation/RuleBundleValidatorTests.cs b/src/AirGap/__Tests/StellaOps.AirGap.Importer.Tests/Validation/RuleBundleValidatorTests.cs
new file mode 100644
index 000000000..d648d527e
--- /dev/null
+++ b/src/AirGap/__Tests/StellaOps.AirGap.Importer.Tests/Validation/RuleBundleValidatorTests.cs
@@ -0,0 +1,412 @@
+// -----------------------------------------------------------------------------
+// RuleBundleValidatorTests.cs
+// Sprint: SPRINT_20260104_005_AIRGAP (Secret Offline Kit Integration)
+// Task: OKS-008 - Add integration tests for offline flow
+// Description: Tests for rule bundle validation in offline import
+// -----------------------------------------------------------------------------
+
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using FluentAssertions;
+using Microsoft.Extensions.Logging.Abstractions;
+using StellaOps.AirGap.Importer.Contracts;
+using StellaOps.AirGap.Importer.Validation;
+using StellaOps.AirGap.Importer.Versioning;
+using StellaOps.TestKit;
+
+namespace StellaOps.AirGap.Importer.Tests.Validation;
+
+[Trait("Category", TestCategories.Unit)]
+public sealed class RuleBundleValidatorTests : IDisposable
+{
+    private readonly string _tempDir;
+    private readonly CapturingMonotonicityChecker _monotonicityChecker;
+
+    public RuleBundleValidatorTests()
+    {
+        _tempDir = Path.Combine(Path.GetTempPath(), "stellaops-rulebundle-tests", Guid.NewGuid().ToString("N"));
+        Directory.CreateDirectory(_tempDir);
+        _monotonicityChecker = new CapturingMonotonicityChecker();
+    }
+
+    public void Dispose()
+    {
+        try
+        {
+            Directory.Delete(_tempDir, recursive: true);
+        }
+        catch
+        {
+            // Best-effort cleanup
+        }
+    }
+
+    [Fact]
+    public async Task ValidateAsync_WhenManifestNotFound_ShouldFail()
+    {
+        // Arrange
+        var validator = CreateValidator();
+        var bundleDir = Path.Combine(_tempDir, "missing-manifest");
+        Directory.CreateDirectory(bundleDir);
+
+        var request = CreateRequest(bundleDir, "test-bundle", "secrets");
+
+        // Act
+        var result = await validator.ValidateAsync(request);
+
+        // Assert
+        result.IsValid.Should().BeFalse();
+        result.Reason.Should().StartWith("manifest-not-found");
+    }
+
+    [Fact]
+    public async Task ValidateAsync_WhenManifestParseError_ShouldFail()
+    {
+        // Arrange
+        var validator = CreateValidator();
+        var bundleDir = Path.Combine(_tempDir, "invalid-manifest");
+        Directory.CreateDirectory(bundleDir);
+
+        await File.WriteAllTextAsync(
+            Path.Combine(bundleDir, "test-bundle.manifest.json"),
+            "not-valid-json{{{");
+
+        var request = CreateRequest(bundleDir, "test-bundle", "secrets");
+
+        // Act
+        var result = await validator.ValidateAsync(request);
+
+        // Assert
+        result.IsValid.Should().BeFalse();
+        result.Reason.Should().StartWith("manifest-parse-failed");
+    }
+
+    [Fact]
+    public async Task ValidateAsync_WhenFileDigestMismatch_ShouldFail()
+    {
+        // Arrange
+        var validator = CreateValidator();
+        var bundleDir = Path.Combine(_tempDir, "digest-mismatch");
+        Directory.CreateDirectory(bundleDir);
+
+        var rulesContent = "{\"id\":\"test-rule\"}";
+        var rulesPath = Path.Combine(bundleDir, "test-bundle.rules.jsonl");
+        await File.WriteAllTextAsync(rulesPath, rulesContent);
+
+        // Create manifest with wrong digest
+        var manifest = new
+        {
+            bundleId = "test-bundle",
+            bundleType = "secrets",
+            version = "2026.1.0",
+            ruleCount = 1,
+            files = new[]
+            {
+                new
+                {
+                    name = "test-bundle.rules.jsonl",
+                    digest = "sha256:0000000000000000000000000000000000000000000000000000000000000000",
+                    sizeBytes = rulesContent.Length
+                }
+            }
+        };
+
+        await File.WriteAllTextAsync(
+            Path.Combine(bundleDir, "test-bundle.manifest.json"),
+            JsonSerializer.Serialize(manifest));
+
+        var request = CreateRequest(bundleDir, "test-bundle", "secrets");
+
+        // Act
+        var result = await validator.ValidateAsync(request);
+
+        // Assert
+        result.IsValid.Should().BeFalse();
+        result.Reason.Should().Contain("digest-mismatch");
+    }
+
+    [Fact]
+    public async Task ValidateAsync_WhenFileMissing_ShouldFail()
+    {
+        // Arrange
+        var validator = CreateValidator();
+        var bundleDir = Path.Combine(_tempDir, "file-missing");
+        Directory.CreateDirectory(bundleDir);
+
+        var manifest = new
+        {
+            bundleId = "test-bundle",
+            bundleType = "secrets",
+            version = "2026.1.0",
+            ruleCount = 1,
+            files = new[]
+            {
+                new
+                {
+                    name = "test-bundle.rules.jsonl",
+                    digest = "sha256:abcd1234",
+                    sizeBytes = 100
+                }
+            }
+        };
+
+        await File.WriteAllTextAsync(
+            Path.Combine(bundleDir, "test-bundle.manifest.json"),
+            JsonSerializer.Serialize(manifest));
+
+        var request = CreateRequest(bundleDir, "test-bundle", "secrets");
+
+        // Act
+        var result = await validator.ValidateAsync(request);
+
+        // Assert
+        result.IsValid.Should().BeFalse();
+        result.Reason.Should().Contain("file-missing");
+    }
+
+    [Fact]
+    public async Task ValidateAsync_WhenSignatureRequiredButMissing_ShouldFail()
+    {
+        // Arrange
+        var validator = CreateValidator();
+        var bundleDir = await CreateValidBundleAsync("sig-required");
+
+        var request = CreateRequest(
+            bundleDir,
+            "test-bundle",
+            "secrets",
+            signatureEnvelope: null,
+            requireSignature: true);
+
+        // Act
+        var result = await validator.ValidateAsync(request);
+
+        // Assert
+        result.IsValid.Should().BeFalse();
+        result.Reason.Should().Be("signature-required-but-missing");
+    }
+
+    [Fact]
+    public async Task ValidateAsync_WhenVersionNonMonotonic_ShouldFail()
+    {
+        // Arrange
+        var monotonicityChecker = new NonMonotonicChecker();
+        var validator = CreateValidator(monotonicityChecker);
+        var bundleDir = await CreateValidBundleAsync("non-monotonic");
+
+        var request = CreateRequest(
+            bundleDir,
+            "test-bundle",
+            "secrets",
+            requireSignature: false);
+
+        // Act
+        var result = await validator.ValidateAsync(request);
+
+        // Assert
+        result.IsValid.Should().BeFalse();
+        result.Reason.Should().StartWith("version-non-monotonic");
+    }
+
+    [Fact]
+    public async Task ValidateAsync_WhenAllChecksPass_ShouldSucceed()
+    {
+        // Arrange
+        var validator = CreateValidator();
+        var bundleDir = await CreateValidBundleAsync("all-pass");
+
+        var request = CreateRequest(
+            bundleDir,
+            "test-bundle",
+            "secrets",
+            requireSignature: false);
+
+        // Act
+        var result = await validator.ValidateAsync(request);
+
+        // Assert
+        result.IsValid.Should().BeTrue();
+        result.Reason.Should().Be("rulebundle-validated");
+        result.RuleCount.Should().BeGreaterThan(0);
+    }
+
+    [Fact]
+    public async Task ValidateAsync_WhenForceActivateWithOlderVersion_ShouldSucceed()
+    {
+        // Arrange
+        var monotonicityChecker = new NonMonotonicChecker();
+        var validator = CreateValidator(monotonicityChecker);
+        var bundleDir = await CreateValidBundleAsync("force-activate");
+
+        var request = CreateRequest(
+            bundleDir,
+            "test-bundle",
+            "secrets",
+            requireSignature: false,
+            forceActivate: true,
+            forceActivateReason: "Rollback due to compatibility issue");
+
+        // Act
+        var result = await validator.ValidateAsync(request);
+
+        // Assert
+        result.IsValid.Should().BeTrue();
+        result.Reason.Should().Be("rulebundle-validated");
+    }
+
+    [Fact]
+    public async Task ValidateAsync_ShouldRecordActivation()
+    {
+        // Arrange
+        var validator = CreateValidator();
+        var bundleDir = await CreateValidBundleAsync("record-activation");
+
+        var request = CreateRequest(
+            bundleDir,
+            "test-bundle",
+            "secrets",
+            requireSignature: false);
+
+        // Act
+        var result = await validator.ValidateAsync(request);
+
+        // Assert
+        result.IsValid.Should().BeTrue();
+        _monotonicityChecker.RecordedActivations.Should().HaveCount(1);
+        _monotonicityChecker.RecordedActivations[0].BundleType.Should().Contain("secrets");
+    }
+
+    private RuleBundleValidator CreateValidator(IVersionMonotonicityChecker? checker = null)
+    {
+        return new RuleBundleValidator(
+            new DsseVerifier(),
+            checker ?? _monotonicityChecker,
+            NullLogger<RuleBundleValidator>.Instance);
+    }
+
+    private async Task<string> CreateValidBundleAsync(string name)
+    {
+        var bundleDir = Path.Combine(_tempDir, name);
+        Directory.CreateDirectory(bundleDir);
+
+        // Create rules file
+        var rulesContent = "{\"id\":\"test-rule-1\",\"name\":\"Test Rule\",\"pattern\":\"SECRET_\"}\n" +
+                          "{\"id\":\"test-rule-2\",\"name\":\"Another Rule\",\"pattern\":\"API_KEY_\"}";
+        var rulesPath = Path.Combine(bundleDir, "test-bundle.rules.jsonl");
+        await File.WriteAllTextAsync(rulesPath, rulesContent);
+
+        // Compute digest
+        var rulesBytes = Encoding.UTF8.GetBytes(rulesContent);
+        var rulesDigest = $"sha256:{Convert.ToHexString(SHA256.HashData(rulesBytes)).ToLowerInvariant()}";
+
+        // Create manifest
+        var manifest = new
+        {
+            bundleId = "test-bundle",
+            bundleType = "secrets",
+            version = "2026.1.0",
+            ruleCount = 2,
+            files = new[]
+            {
+                new
+                {
+                    name = "test-bundle.rules.jsonl",
+                    digest = rulesDigest,
+                    sizeBytes = rulesBytes.Length
+                }
+            }
+        };
+
+        await File.WriteAllTextAsync(
+            Path.Combine(bundleDir, "test-bundle.manifest.json"),
+            JsonSerializer.Serialize(manifest, new JsonSerializerOptions { WriteIndented = true }));
+
+        return bundleDir;
+    }
+
+    private static RuleBundleValidationRequest CreateRequest(
+        string bundleDir,
+        string bundleId,
+        string bundleType,
+        DsseEnvelope? signatureEnvelope = null,
+        TrustRootConfig? trustRoots = null,
+        bool requireSignature = false,
+        bool forceActivate = false,
+        string? forceActivateReason = null)
+    {
+        return new RuleBundleValidationRequest(
+            TenantId: "tenant-test",
+            BundleId: bundleId,
+            BundleType: bundleType,
+            Version: "2026.1.0",
+            BundleDirectory: bundleDir,
+            CreatedAt: DateTimeOffset.UtcNow,
+            SignatureEnvelope: signatureEnvelope,
+            TrustRoots: trustRoots ?? TrustRootConfig.Empty("/tmp"),
+            RequireSignature: requireSignature,
+            ForceActivate: forceActivate,
+            ForceActivateReason: forceActivateReason);
+    }
+
+    private sealed class CapturingMonotonicityChecker : IVersionMonotonicityChecker
+    {
+        public List<(string TenantId, string BundleType, BundleVersion Version)> RecordedActivations { get; } = [];
+
+        public Task<MonotonicityCheckResult> CheckAsync(
+            string tenantId,
+            string bundleType,
+            BundleVersion incomingVersion,
+            CancellationToken cancellationToken = default)
+        {
+            return Task.FromResult(new MonotonicityCheckResult(
+                IsMonotonic: true,
+                CurrentVersion: null,
+                CurrentBundleDigest: null,
+                CurrentActivatedAt: null,
+                ReasonCode: "FIRST_ACTIVATION"));
+        }
+
+        public Task RecordActivationAsync(
+            string tenantId,
+            string bundleType,
+            BundleVersion version,
+            string bundleDigest,
+            bool wasForceActivated = false,
+            string? forceActivateReason = null,
+            CancellationToken cancellationToken = default)
+        {
+            RecordedActivations.Add((tenantId, bundleType, version));
+            return Task.CompletedTask;
+        }
+    }
+
+    private sealed class NonMonotonicChecker : IVersionMonotonicityChecker
+    {
+        public Task<MonotonicityCheckResult> CheckAsync(
+            string tenantId,
+            string bundleType,
+            BundleVersion incomingVersion,
+            CancellationToken cancellationToken = default)
+        {
+            return Task.FromResult(new MonotonicityCheckResult(
+                IsMonotonic: false,
+                CurrentVersion: BundleVersion.Parse("2026.12.0", DateTimeOffset.UtcNow),
+                CurrentBundleDigest: "sha256:current",
+                CurrentActivatedAt: DateTimeOffset.UtcNow.AddDays(-1),
+                ReasonCode: "OLDER_VERSION"));
+        }
+
+        public Task RecordActivationAsync(
+            string tenantId,
+            string bundleType,
+            BundleVersion version,
+            string bundleDigest,
+            bool wasForceActivated = false,
+            string? forceActivateReason = null,
+            CancellationToken cancellationToken = default)
+        {
+            return Task.CompletedTask;
+        }
+    }
+}
diff --git a/src/Attestor/__Libraries/StellaOps.Attestor.Offline/Abstractions/IOfflineRootStore.cs b/src/Attestor/__Libraries/StellaOps.Attestor.Offline/Abstractions/IOfflineRootStore.cs
index 41a079b91..11f41b0f2 100644
--- a/src/Attestor/__Libraries/StellaOps.Attestor.Offline/Abstractions/IOfflineRootStore.cs
+++ b/src/Attestor/__Libraries/StellaOps.Attestor.Offline/Abstractions/IOfflineRootStore.cs
@@ -69,6 +69,18 @@ public interface IOfflineRootStore
     Task<IReadOnlyList<RootCertificateInfo>> ListRootsAsync(
         RootType rootType,
         CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Get a rule bundle signing key by ID and bundle type.
+    /// </summary>
+    /// <param name="keyId">The key identifier.</param>
+    /// <param name="bundleType">The bundle type (e.g., "secrets", "malware").</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The envelope key if found, null otherwise.</returns>
+    Task<StellaOps.Attestor.Envelope.EnvelopeKey?> GetRuleBundleSigningKeyAsync(
+        string keyId,
+        string bundleType,
+        CancellationToken cancellationToken = default);
 }
 
 /// <summary>
@@ -81,7 +93,9 @@ public enum RootType
     /// <summary>Organization signing keys for bundle endorsement.</summary>
     OrgSigning,
     /// <summary>Rekor public keys for transparency log verification.</summary>
-    Rekor
+    Rekor,
+    /// <summary>Rule bundle signing keys for secrets/malware rule bundles.</summary>
+    RuleBundleSigning
 }
 
 /// <summary>
diff --git a/src/Attestor/__Libraries/StellaOps.Attestor.Offline/Abstractions/IRuleBundleSignatureVerifier.cs b/src/Attestor/__Libraries/StellaOps.Attestor.Offline/Abstractions/IRuleBundleSignatureVerifier.cs
new file mode 100644
index 000000000..9a99cc3cf
--- /dev/null
+++ b/src/Attestor/__Libraries/StellaOps.Attestor.Offline/Abstractions/IRuleBundleSignatureVerifier.cs
@@ -0,0 +1,168 @@
+// -----------------------------------------------------------------------------
+// IRuleBundleSignatureVerifier.cs
+// Sprint: SPRINT_20260104_005_AIRGAP (Secret Offline Kit Integration)
+// Task: OKS-004 - Add Attestor mirror support for bundle verification
+// Description: Interface for verifying rule bundle signatures offline
+// -----------------------------------------------------------------------------
+
+using StellaOps.Attestor.Offline.Models;
+
+namespace StellaOps.Attestor.Offline.Abstractions;
+
+/// <summary>
+/// Service for verifying rule bundle (secrets, malware, etc.) signatures offline.
+/// Enables air-gapped environments to verify rule bundle signatures using
+/// locally stored signing keys.
+/// </summary>
+public interface IRuleBundleSignatureVerifier
+{
+    /// <summary>
+    /// Verify a rule bundle signature.
+    /// </summary>
+    /// <param name="request">The verification request.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>Verification result with detailed status.</returns>
+    Task<RuleBundleSignatureResult> VerifyAsync(
+        RuleBundleSignatureRequest request,
+        CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Verify a rule bundle from a directory.
+    /// </summary>
+    /// <param name="bundleDirectory">Directory containing the rule bundle.</param>
+    /// <param name="bundleId">Expected bundle identifier.</param>
+    /// <param name="options">Verification options.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>Verification result.</returns>
+    Task<RuleBundleSignatureResult> VerifyDirectoryAsync(
+        string bundleDirectory,
+        string bundleId,
+        RuleBundleVerificationOptions? options = null,
+        CancellationToken cancellationToken = default);
+}
+
+/// <summary>
+/// Request for verifying a rule bundle signature.
+/// </summary>
+public sealed record RuleBundleSignatureRequest
+{
+    /// <summary>
+    /// The DSSE envelope containing the signature.
+    /// </summary>
+    public required byte[] EnvelopeBytes { get; init; }
+
+    /// <summary>
+    /// The payload (manifest) that was signed.
+    /// </summary>
+    public required byte[] PayloadBytes { get; init; }
+
+    /// <summary>
+    /// Expected bundle identifier.
+    /// </summary>
+    public required string BundleId { get; init; }
+
+    /// <summary>
+    /// Expected bundle type (e.g., "secrets", "malware").
+    /// </summary>
+    public required string BundleType { get; init; }
+
+    /// <summary>
+    /// Expected bundle version.
+    /// </summary>
+    public required string Version { get; init; }
+
+    /// <summary>
+    /// Key ID that should have signed the bundle (optional).
+    /// </summary>
+    public string? ExpectedKeyId { get; init; }
+}
+
+/// <summary>
+/// Result of rule bundle signature verification.
+/// </summary>
+public sealed record RuleBundleSignatureResult
+{
+    /// <summary>
+    /// Whether the signature is valid.
+    /// </summary>
+    public bool IsValid { get; init; }
+
+    /// <summary>
+    /// Key ID that signed the bundle.
+    /// </summary>
+    public string? SignerKeyId { get; init; }
+
+    /// <summary>
+    /// Algorithm used for signing.
+    /// </summary>
+    public string? Algorithm { get; init; }
+
+    /// <summary>
+    /// When the signature was verified.
+    /// </summary>
+    public DateTimeOffset VerifiedAt { get; init; }
+
+    /// <summary>
+    /// Error message if verification failed.
+    /// </summary>
+    public string? Error { get; init; }
+
+    /// <summary>
+    /// Detailed verification issues.
+    /// </summary>
+    public IReadOnlyList<VerificationIssue> Issues { get; init; } = [];
+
+    /// <summary>
+    /// Create a successful result.
+    /// </summary>
+    public static RuleBundleSignatureResult Success(
+        string signerKeyId,
+        string algorithm,
+        DateTimeOffset verifiedAt) => new()
+    {
+        IsValid = true,
+        SignerKeyId = signerKeyId,
+        Algorithm = algorithm,
+        VerifiedAt = verifiedAt
+    };
+
+    /// <summary>
+    /// Create a failed result.
+    /// </summary>
+    public static RuleBundleSignatureResult Failure(
+        string error,
+        DateTimeOffset verifiedAt,
+        IReadOnlyList<VerificationIssue>? issues = null) => new()
+    {
+        IsValid = false,
+        Error = error,
+        VerifiedAt = verifiedAt,
+        Issues = issues ?? []
+    };
+}
+
+/// <summary>
+/// Options for rule bundle verification.
+/// </summary>
+public sealed record RuleBundleVerificationOptions
+{
+    /// <summary>
+    /// Path to the signing key file.
+    /// </summary>
+    public string? SigningKeyPath { get; init; }
+
+    /// <summary>
+    /// Expected signer key ID.
+    /// </summary>
+    public string? ExpectedKeyId { get; init; }
+
+    /// <summary>
+    /// Whether to require a valid signature.
+    /// </summary>
+    public bool RequireSignature { get; init; } = true;
+
+    /// <summary>
+    /// Whether to use strict mode (fail on any warning).
+    /// </summary>
+    public bool StrictMode { get; init; }
+}
diff --git a/src/Attestor/__Libraries/StellaOps.Attestor.Offline/Services/FileSystemRootStore.cs b/src/Attestor/__Libraries/StellaOps.Attestor.Offline/Services/FileSystemRootStore.cs
index 29c1c67df..04d5a870f 100644
--- a/src/Attestor/__Libraries/StellaOps.Attestor.Offline/Services/FileSystemRootStore.cs
+++ b/src/Attestor/__Libraries/StellaOps.Attestor.Offline/Services/FileSystemRootStore.cs
@@ -8,8 +8,10 @@
 using System.Security.Cryptography;
 using System.Security.Cryptography.X509Certificates;
 using System.Text;
+using System.Text.Json;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
+using StellaOps.Attestor.Envelope;
 using StellaOps.Attestor.Offline.Abstractions;
 
 namespace StellaOps.Attestor.Offline.Services;
@@ -26,6 +28,8 @@ public sealed class FileSystemRootStore : IOfflineRootStore
     private X509Certificate2Collection? _fulcioRoots;
     private X509Certificate2Collection? _orgSigningKeys;
     private X509Certificate2Collection? _rekorKeys;
+    private X509Certificate2Collection? _ruleBundleSigningKeys;
+    private readonly Dictionary<string, EnvelopeKey> _ruleBundleKeyCache = new(StringComparer.OrdinalIgnoreCase);
     private readonly SemaphoreSlim _loadLock = new(1, 1);
 
     /// <summary>
@@ -75,6 +79,20 @@ public sealed class FileSystemRootStore : IOfflineRootStore
         return _rekorKeys ?? new X509Certificate2Collection();
     }
 
+    /// <summary>
+    /// Get rule bundle signing key certificates.
+    /// </summary>
+    public async Task<X509Certificate2Collection> GetRuleBundleSigningKeysAsync(
+        CancellationToken cancellationToken = default)
+    {
+        if (_ruleBundleSigningKeys == null)
+        {
+            await LoadRootsAsync(RootType.RuleBundleSigning, cancellationToken);
+        }
+
+        return _ruleBundleSigningKeys ?? new X509Certificate2Collection();
+    }
+
     /// <inheritdoc />
     public async Task ImportRootsAsync(
         string pemPath,
@@ -160,6 +178,66 @@ public sealed class FileSystemRootStore : IOfflineRootStore
         return null;
     }
 
+    /// <inheritdoc />
+    public async Task<EnvelopeKey?> GetRuleBundleSigningKeyAsync(
+        string keyId,
+        string bundleType,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(keyId);
+        ArgumentException.ThrowIfNullOrWhiteSpace(bundleType);
+
+        // Check cache first
+        var cacheKey = $"{bundleType}:{keyId}";
+        if (_ruleBundleKeyCache.TryGetValue(cacheKey, out var cachedKey))
+        {
+            return cachedKey;
+        }
+
+        // Load signing keys if not loaded
+        if (_ruleBundleSigningKeys == null)
+        {
+            await LoadRootsAsync(RootType.RuleBundleSigning, cancellationToken);
+        }
+
+        // Look for the key in the certificate store
+        if (_ruleBundleSigningKeys != null)
+        {
+            foreach (var cert in _ruleBundleSigningKeys)
+            {
+                var certKeyId = GetSubjectKeyIdentifier(cert) ?? ComputeThumbprint(cert);
+                if (certKeyId.Equals(keyId, StringComparison.OrdinalIgnoreCase))
+                {
+                    var envelopeKey = CreateEnvelopeKeyFromCertificate(cert);
+                    if (envelopeKey != null)
+                    {
+                        _ruleBundleKeyCache[cacheKey] = envelopeKey;
+                        return envelopeKey;
+                    }
+                }
+            }
+        }
+
+        // Try loading from JSON key file
+        var jsonKeyPath = GetRuleBundleKeyPath(bundleType, keyId);
+        if (!string.IsNullOrEmpty(jsonKeyPath) && File.Exists(jsonKeyPath))
+        {
+            var envelopeKey = await LoadEnvelopeKeyFromJsonAsync(jsonKeyPath, cancellationToken);
+            if (envelopeKey != null)
+            {
+                _ruleBundleKeyCache[cacheKey] = envelopeKey;
+                return envelopeKey;
+            }
+        }
+
+        _logger.LogWarning(
+            "Rule bundle signing key not found: keyId={KeyId} bundleType={BundleType}",
+            keyId,
+            bundleType);
+
+        return null;
+    }
+
     /// <inheritdoc />
     public async Task<IReadOnlyList<RootCertificateInfo>> ListRootsAsync(
         RootType rootType,
@@ -170,6 +248,7 @@ public sealed class FileSystemRootStore : IOfflineRootStore
             RootType.Fulcio => await GetFulcioRootsAsync(cancellationToken),
             RootType.OrgSigning => await GetOrgSigningKeysAsync(cancellationToken),
             RootType.Rekor => await GetRekorKeysAsync(cancellationToken),
+            RootType.RuleBundleSigning => await GetRuleBundleSigningKeysAsync(cancellationToken),
             _ => throw new ArgumentOutOfRangeException(nameof(rootType))
         };
 
@@ -297,6 +376,7 @@ public sealed class FileSystemRootStore : IOfflineRootStore
         RootType.Fulcio => _options.FulcioBundlePath ?? "",
         RootType.OrgSigning => _options.OrgSigningBundlePath ?? "",
         RootType.Rekor => _options.RekorBundlePath ?? "",
+        RootType.RuleBundleSigning => _options.RuleBundleSigningPath ?? "",
         _ => ""
     };
 
@@ -305,6 +385,7 @@ public sealed class FileSystemRootStore : IOfflineRootStore
         RootType.Fulcio => _options.FulcioBundlePath ?? Path.Combine(_options.BaseRootPath, "fulcio"),
         RootType.OrgSigning => _options.OrgSigningBundlePath ?? Path.Combine(_options.BaseRootPath, "org-signing"),
         RootType.Rekor => _options.RekorBundlePath ?? Path.Combine(_options.BaseRootPath, "rekor"),
+        RootType.RuleBundleSigning => _options.RuleBundleSigningPath ?? Path.Combine(_options.BaseRootPath, "rule-bundle-signing"),
         _ => _options.BaseRootPath
     };
 
@@ -320,6 +401,7 @@ public sealed class FileSystemRootStore : IOfflineRootStore
             RootType.Fulcio => Path.Combine(_options.OfflineKitPath, "roots", "fulcio"),
             RootType.OrgSigning => Path.Combine(_options.OfflineKitPath, "roots", "org-signing"),
             RootType.Rekor => Path.Combine(_options.OfflineKitPath, "roots", "rekor"),
+            RootType.RuleBundleSigning => Path.Combine(_options.OfflineKitPath, "roots", "rule-bundle-signing"),
             _ => null
         };
     }
@@ -329,6 +411,7 @@ public sealed class FileSystemRootStore : IOfflineRootStore
         RootType.Fulcio => _fulcioRoots,
         RootType.OrgSigning => _orgSigningKeys,
         RootType.Rekor => _rekorKeys,
+        RootType.RuleBundleSigning => _ruleBundleSigningKeys,
         _ => null
     };
 
@@ -345,6 +428,9 @@ public sealed class FileSystemRootStore : IOfflineRootStore
             case RootType.Rekor:
                 _rekorKeys = collection;
                 break;
+            case RootType.RuleBundleSigning:
+                _ruleBundleSigningKeys = collection;
+                break;
         }
     }
 
@@ -361,9 +447,130 @@ public sealed class FileSystemRootStore : IOfflineRootStore
             case RootType.Rekor:
                 _rekorKeys = null;
                 break;
+            case RootType.RuleBundleSigning:
+                _ruleBundleSigningKeys = null;
+                _ruleBundleKeyCache.Clear();
+                break;
         }
     }
 
+    private string? GetRuleBundleKeyPath(string bundleType, string keyId)
+    {
+        var basePath = _options.RuleBundleSigningPath ?? Path.Combine(_options.BaseRootPath, "rule-bundle-signing");
+        if (string.IsNullOrEmpty(basePath))
+        {
+            return null;
+        }
+
+        // Try bundle-type specific path first
+        var typeSpecificPath = Path.Combine(basePath, bundleType, $"{keyId}.json");
+        if (File.Exists(typeSpecificPath))
+        {
+            return typeSpecificPath;
+        }
+
+        // Fall back to general path
+        return Path.Combine(basePath, $"{keyId}.json");
+    }
+
+    private static async Task<EnvelopeKey?> LoadEnvelopeKeyFromJsonAsync(
+        string path,
+        CancellationToken cancellationToken)
+    {
+        try
+        {
+            var json = await File.ReadAllTextAsync(path, cancellationToken);
+            using var doc = JsonDocument.Parse(json);
+
+            var algorithm = doc.RootElement.TryGetProperty("algorithm", out var alg)
+                ? alg.GetString() ?? "ES256"
+                : "ES256";
+            var keyId = doc.RootElement.TryGetProperty("keyId", out var kid)
+                ? kid.GetString() ?? ""
+                : "";
+            var publicKeyBase64 = doc.RootElement.TryGetProperty("publicKey", out var pk)
+                ? pk.GetString()
+                : null;
+
+            if (string.IsNullOrEmpty(publicKeyBase64))
+            {
+                return null;
+            }
+
+            var publicKeyBytes = Convert.FromBase64String(publicKeyBase64);
+
+            // Create EnvelopeKey based on algorithm
+            return algorithm.ToUpperInvariant() switch
+            {
+                "ES256" => EnvelopeKey.CreateEcdsaVerifier("ES256", LoadEcParameters(publicKeyBytes, ECCurve.NamedCurves.nistP256)),
+                "ES384" => EnvelopeKey.CreateEcdsaVerifier("ES384", LoadEcParameters(publicKeyBytes, ECCurve.NamedCurves.nistP384)),
+                "ES512" => EnvelopeKey.CreateEcdsaVerifier("ES512", LoadEcParameters(publicKeyBytes, ECCurve.NamedCurves.nistP521)),
+                "ED25519" => EnvelopeKey.CreateEd25519Verifier(publicKeyBytes),
+                _ => null
+            };
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    private static ECParameters LoadEcParameters(byte[] publicKey, ECCurve curve)
+    {
+        // Assume the key is in uncompressed format (0x04 prefix + X + Y)
+        var keySize = curve.Oid.Value switch
+        {
+            "1.2.840.10045.3.1.7" => 32, // P-256
+            "1.3.132.0.34" => 48, // P-384
+            "1.3.132.0.35" => 66, // P-521
+            _ => 32
+        };
+
+        if (publicKey.Length == 2 * keySize + 1 && publicKey[0] == 0x04)
+        {
+            return new ECParameters
+            {
+                Curve = curve,
+                Q = new ECPoint
+                {
+                    X = publicKey[1..(keySize + 1)],
+                    Y = publicKey[(keySize + 1)..]
+                }
+            };
+        }
+
+        // Try to parse as SubjectPublicKeyInfo (DER format)
+        using var ecdsa = ECDsa.Create();
+        ecdsa.ImportSubjectPublicKeyInfo(publicKey, out _);
+        return ecdsa.ExportParameters(false);
+    }
+
+    private static EnvelopeKey? CreateEnvelopeKeyFromCertificate(X509Certificate2 cert)
+    {
+        try
+        {
+            using var ecdsa = cert.GetECDsaPublicKey();
+            if (ecdsa != null)
+            {
+                var parameters = ecdsa.ExportParameters(false);
+                var algorithmId = parameters.Curve.Oid.Value switch
+                {
+                    "1.2.840.10045.3.1.7" => "ES256",
+                    "1.3.132.0.34" => "ES384",
+                    "1.3.132.0.35" => "ES512",
+                    _ => "ES256"
+                };
+                return EnvelopeKey.CreateEcdsaVerifier(algorithmId, parameters);
+            }
+        }
+        catch
+        {
+            // Swallow and try other key types
+        }
+
+        return null;
+    }
+
     private static string ComputeThumbprint(X509Certificate2 cert)
     {
         var hash = SHA256.HashData(cert.RawData);
@@ -418,6 +625,11 @@ public sealed class OfflineRootStoreOptions
     /// </summary>
     public string? RekorBundlePath { get; set; }
 
+    /// <summary>
+    /// Path to rule bundle signing keys (file or directory).
+    /// </summary>
+    public string? RuleBundleSigningPath { get; set; }
+
     /// <summary>
     /// Path to Offline Kit installation.
     /// </summary>
diff --git a/src/Attestor/__Libraries/StellaOps.Attestor.Offline/Services/RuleBundleSignatureVerifier.cs b/src/Attestor/__Libraries/StellaOps.Attestor.Offline/Services/RuleBundleSignatureVerifier.cs
new file mode 100644
index 000000000..61253d5c0
--- /dev/null
+++ b/src/Attestor/__Libraries/StellaOps.Attestor.Offline/Services/RuleBundleSignatureVerifier.cs
@@ -0,0 +1,346 @@
+// -----------------------------------------------------------------------------
+// RuleBundleSignatureVerifier.cs
+// Sprint: SPRINT_20260104_005_AIRGAP (Secret Offline Kit Integration)
+// Task: OKS-004 - Add Attestor mirror support for bundle verification
+// Description: Verifies rule bundle signatures offline
+// -----------------------------------------------------------------------------
+
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using Microsoft.Extensions.Logging;
+using StellaOps.Attestor.Envelope;
+using StellaOps.Attestor.Offline.Abstractions;
+using StellaOps.Attestor.Offline.Models;
+
+namespace StellaOps.Attestor.Offline.Services;
+
+/// <summary>
+/// Verifies rule bundle (secrets, malware, etc.) signatures offline.
+/// </summary>
+public sealed class RuleBundleSignatureVerifier : IRuleBundleSignatureVerifier
+{
+    private readonly IOfflineRootStore _rootStore;
+    private readonly EnvelopeSignatureService _signatureService = new();
+    private readonly ILogger<RuleBundleSignatureVerifier> _logger;
+    private readonly TimeProvider _timeProvider;
+
+    public RuleBundleSignatureVerifier(
+        IOfflineRootStore rootStore,
+        ILogger<RuleBundleSignatureVerifier> logger,
+        TimeProvider? timeProvider = null)
+    {
+        _rootStore = rootStore ?? throw new ArgumentNullException(nameof(rootStore));
+        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        _timeProvider = timeProvider ?? TimeProvider.System;
+    }
+
+    /// <inheritdoc />
+    public async Task<RuleBundleSignatureResult> VerifyAsync(
+        RuleBundleSignatureRequest request,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        ArgumentException.ThrowIfNullOrWhiteSpace(request.BundleId);
+        ArgumentException.ThrowIfNullOrWhiteSpace(request.BundleType);
+
+        var verifiedAt = _timeProvider.GetUtcNow();
+        var issues = new List<VerificationIssue>();
+
+        _logger.LogInformation(
+            "Verifying rule bundle signature: bundle_id={BundleId} bundle_type={BundleType} version={Version}",
+            request.BundleId,
+            request.BundleType,
+            request.Version);
+
+        try
+        {
+            // Parse DSSE envelope
+            DsseEnvelope envelope;
+            try
+            {
+                envelope = ParseDsseEnvelope(request.EnvelopeBytes);
+            }
+            catch (Exception ex)
+            {
+                issues.Add(new VerificationIssue(
+                    VerificationIssueSeverity.Critical,
+                    "ENVELOPE_PARSE_FAILED",
+                    $"Failed to parse DSSE envelope: {ex.Message}"));
+                return RuleBundleSignatureResult.Failure(
+                    $"envelope-parse-failed:{ex.GetType().Name.ToLowerInvariant()}",
+                    verifiedAt,
+                    issues);
+            }
+
+            // Verify payload type
+            if (envelope.PayloadType != "application/vnd.stellaops.rulebundle.manifest+json" &&
+                envelope.PayloadType != "application/json")
+            {
+                issues.Add(new VerificationIssue(
+                    VerificationIssueSeverity.Warning,
+                    "UNEXPECTED_PAYLOAD_TYPE",
+                    $"Unexpected payload type: {envelope.PayloadType}"));
+            }
+
+            // Verify payload digest matches
+            var envelopePayloadBytes = Convert.FromBase64String(envelope.Payload);
+            var envelopePayloadDigest = ComputeSha256Digest(envelopePayloadBytes);
+            var requestPayloadDigest = ComputeSha256Digest(request.PayloadBytes);
+
+            if (envelopePayloadDigest != requestPayloadDigest)
+            {
+                issues.Add(new VerificationIssue(
+                    VerificationIssueSeverity.Critical,
+                    "PAYLOAD_DIGEST_MISMATCH",
+                    $"Envelope payload digest {envelopePayloadDigest} does not match provided payload {requestPayloadDigest}"));
+                return RuleBundleSignatureResult.Failure(
+                    "payload-digest-mismatch",
+                    verifiedAt,
+                    issues);
+            }
+
+            // Verify signatures
+            if (envelope.Signatures.Count == 0)
+            {
+                issues.Add(new VerificationIssue(
+                    VerificationIssueSeverity.Critical,
+                    "NO_SIGNATURES",
+                    "DSSE envelope has no signatures"));
+                return RuleBundleSignatureResult.Failure(
+                    "no-signatures",
+                    verifiedAt,
+                    issues);
+            }
+
+            // Get the signer key
+            var signature = envelope.Signatures[0];
+            var signerKeyId = signature.KeyId;
+
+            if (request.ExpectedKeyId != null &&
+                !string.Equals(signerKeyId, request.ExpectedKeyId, StringComparison.Ordinal))
+            {
+                issues.Add(new VerificationIssue(
+                    VerificationIssueSeverity.Critical,
+                    "KEYID_MISMATCH",
+                    $"Expected key ID {request.ExpectedKeyId} but got {signerKeyId}"));
+                return RuleBundleSignatureResult.Failure(
+                    $"keyid-mismatch:expected={request.ExpectedKeyId}:actual={signerKeyId}",
+                    verifiedAt,
+                    issues);
+            }
+
+            // Look up the signing key from the root store
+            var signingKey = await _rootStore.GetRuleBundleSigningKeyAsync(
+                signerKeyId,
+                request.BundleType,
+                cancellationToken);
+
+            if (signingKey == null)
+            {
+                issues.Add(new VerificationIssue(
+                    VerificationIssueSeverity.Critical,
+                    "KEY_NOT_FOUND",
+                    $"Signing key {signerKeyId} not found in root store for bundle type {request.BundleType}"));
+                return RuleBundleSignatureResult.Failure(
+                    $"key-not-found:{signerKeyId}",
+                    verifiedAt,
+                    issues);
+            }
+
+            // Verify the DSSE signature
+            var signatureBytes = Convert.FromBase64String(signature.Sig);
+            var dsseSignature = new EnvelopeSignature(
+                signerKeyId,
+                signingKey.AlgorithmId,
+                signatureBytes);
+
+            var verifyResult = _signatureService.VerifyDsse(
+                envelope.PayloadType,
+                envelopePayloadBytes,
+                dsseSignature,
+                signingKey);
+
+            if (!verifyResult.IsSuccess || !verifyResult.Value)
+            {
+                var errorMessage = verifyResult.IsSuccess
+                    ? "Signature verification failed"
+                    : $"Signature verification failed: {verifyResult.Error.Code}";
+
+                issues.Add(new VerificationIssue(
+                    VerificationIssueSeverity.Critical,
+                    "SIGNATURE_INVALID",
+                    errorMessage));
+                return RuleBundleSignatureResult.Failure(
+                    "signature-invalid",
+                    verifiedAt,
+                    issues);
+            }
+
+            _logger.LogInformation(
+                "Rule bundle signature verified: bundle_id={BundleId} signer_key_id={SignerKeyId}",
+                request.BundleId,
+                signerKeyId);
+
+            return RuleBundleSignatureResult.Success(
+                signerKeyId,
+                signingKey.AlgorithmId,
+                verifiedAt);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(
+                ex,
+                "Failed to verify rule bundle signature: bundle_id={BundleId}",
+                request.BundleId);
+
+            issues.Add(new VerificationIssue(
+                VerificationIssueSeverity.Critical,
+                "VERIFICATION_ERROR",
+                $"Verification failed: {ex.Message}"));
+
+            return RuleBundleSignatureResult.Failure(
+                $"verification-error:{ex.GetType().Name.ToLowerInvariant()}",
+                verifiedAt,
+                issues);
+        }
+    }
+
+    /// <inheritdoc />
+    public async Task<RuleBundleSignatureResult> VerifyDirectoryAsync(
+        string bundleDirectory,
+        string bundleId,
+        RuleBundleVerificationOptions? options = null,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(bundleDirectory);
+        ArgumentException.ThrowIfNullOrWhiteSpace(bundleId);
+
+        var verifiedAt = _timeProvider.GetUtcNow();
+        var issues = new List<VerificationIssue>();
+        options ??= new RuleBundleVerificationOptions();
+
+        // Find manifest file
+        var manifestPath = Path.Combine(bundleDirectory, $"{bundleId}.manifest.json");
+        if (!File.Exists(manifestPath))
+        {
+            issues.Add(new VerificationIssue(
+                VerificationIssueSeverity.Critical,
+                "MANIFEST_NOT_FOUND",
+                $"Manifest not found at {manifestPath}"));
+
+            if (options.RequireSignature)
+            {
+                return RuleBundleSignatureResult.Failure(
+                    "manifest-not-found",
+                    verifiedAt,
+                    issues);
+            }
+
+            return new RuleBundleSignatureResult
+            {
+                IsValid = true,
+                VerifiedAt = verifiedAt,
+                Issues = issues
+            };
+        }
+
+        // Find signature file
+        var signaturePath = Path.Combine(bundleDirectory, $"{bundleId}.manifest.sig");
+        if (!File.Exists(signaturePath))
+        {
+            issues.Add(new VerificationIssue(
+                VerificationIssueSeverity.Warning,
+                "SIGNATURE_NOT_FOUND",
+                $"Signature file not found at {signaturePath}"));
+
+            if (options.RequireSignature)
+            {
+                return RuleBundleSignatureResult.Failure(
+                    "signature-not-found",
+                    verifiedAt,
+                    issues);
+            }
+
+            return new RuleBundleSignatureResult
+            {
+                IsValid = true,
+                VerifiedAt = verifiedAt,
+                Issues = issues
+            };
+        }
+
+        // Read manifest and signature
+        var manifestBytes = await File.ReadAllBytesAsync(manifestPath, cancellationToken);
+        var signatureBytes = await File.ReadAllBytesAsync(signaturePath, cancellationToken);
+
+        // Parse manifest to get bundle type and version
+        string bundleType;
+        string version;
+        try
+        {
+            using var doc = JsonDocument.Parse(manifestBytes);
+            bundleType = doc.RootElement.TryGetProperty("bundleType", out var bt)
+                ? bt.GetString() ?? "unknown"
+                : "unknown";
+            version = doc.RootElement.TryGetProperty("version", out var v)
+                ? v.GetString() ?? "0.0"
+                : "0.0";
+        }
+        catch
+        {
+            bundleType = "unknown";
+            version = "0.0";
+        }
+
+        var request = new RuleBundleSignatureRequest
+        {
+            EnvelopeBytes = signatureBytes,
+            PayloadBytes = manifestBytes,
+            BundleId = bundleId,
+            BundleType = bundleType,
+            Version = version,
+            ExpectedKeyId = options.ExpectedKeyId
+        };
+
+        return await VerifyAsync(request, cancellationToken);
+    }
+
+    private static DsseEnvelope ParseDsseEnvelope(byte[] envelopeBytes)
+    {
+        var json = Encoding.UTF8.GetString(envelopeBytes);
+        var envelope = JsonSerializer.Deserialize<DsseEnvelope>(json, JsonOptions);
+        return envelope ?? throw new InvalidOperationException("Failed to parse DSSE envelope");
+    }
+
+    private static string ComputeSha256Digest(byte[] data)
+    {
+        var hash = SHA256.HashData(data);
+        return $"sha256:{Convert.ToHexString(hash).ToLowerInvariant()}";
+    }
+
+    private static readonly JsonSerializerOptions JsonOptions = new()
+    {
+        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+        PropertyNameCaseInsensitive = true
+    };
+}
+
+/// <summary>
+/// DSSE envelope structure for parsing.
+/// </summary>
+internal sealed class DsseEnvelope
+{
+    public string PayloadType { get; set; } = string.Empty;
+    public string Payload { get; set; } = string.Empty;
+    public List<DsseSignature> Signatures { get; set; } = [];
+}
+
+/// <summary>
+/// DSSE signature structure.
+/// </summary>
+internal sealed class DsseSignature
+{
+    public string KeyId { get; set; } = string.Empty;
+    public string Sig { get; set; } = string.Empty;
+}
diff --git a/src/Scanner/StellaOps.Scanner.Worker/Metrics/ScanMetricsCollector.cs b/src/Scanner/StellaOps.Scanner.Worker/Metrics/ScanMetricsCollector.cs
index 3f49729c9..8111fb15e 100644
--- a/src/Scanner/StellaOps.Scanner.Worker/Metrics/ScanMetricsCollector.cs
+++ b/src/Scanner/StellaOps.Scanner.Worker/Metrics/ScanMetricsCollector.cs
@@ -7,6 +7,7 @@
 
 using System.Diagnostics;
 using Microsoft.Extensions.Logging;
+using StellaOps.Determinism.Abstractions;
 using StellaOps.Scanner.Storage.Models;
 using StellaOps.Scanner.Storage.Repositories;
 
@@ -20,6 +21,8 @@ public sealed class ScanMetricsCollector : IDisposable
 {
     private readonly IScanMetricsRepository _repository;
     private readonly ILogger<ScanMetricsCollector> _logger;
+    private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
 
     private readonly Guid _scanId;
     private readonly Guid _tenantId;
@@ -58,7 +61,9 @@ public sealed class ScanMetricsCollector : IDisposable
         Guid tenantId,
         string artifactDigest,
         string artifactType,
-        string scannerVersion)
+        string scannerVersion,
+        TimeProvider? timeProvider = null,
+        IGuidProvider? guidProvider = null)
     {
         _repository = repository ?? throw new ArgumentNullException(nameof(repository));
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
@@ -67,7 +72,9 @@ public sealed class ScanMetricsCollector : IDisposable
         _artifactDigest = artifactDigest ?? throw new ArgumentNullException(nameof(artifactDigest));
         _artifactType = artifactType ?? throw new ArgumentNullException(nameof(artifactType));
         _scannerVersion = scannerVersion ?? throw new ArgumentNullException(nameof(scannerVersion));
-        _metricsId = Guid.NewGuid();
+        _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
+        _metricsId = _guidProvider.NewGuid();
     }
 
     /// <summary>
@@ -80,7 +87,7 @@ public sealed class ScanMetricsCollector : IDisposable
     /// </summary>
     public void Start()
     {
-        _startedAt = DateTimeOffset.UtcNow;
+        _startedAt = _timeProvider.GetUtcNow();
         _totalStopwatch.Start();
         _logger.LogDebug("Started metrics collection for scan {ScanId}", _scanId);
     }
@@ -98,7 +105,7 @@ public sealed class ScanMetricsCollector : IDisposable
                 return NoOpDisposable.Instance;
             }
 
-            var tracker = new PhaseTracker(this, phaseName, DateTimeOffset.UtcNow);
+            var tracker = new PhaseTracker(this, phaseName, _timeProvider.GetUtcNow());
             _phases[phaseName] = tracker;
             _logger.LogDebug("Started phase {PhaseName} for scan {ScanId}", phaseName, _scanId);
             return tracker;
@@ -138,7 +145,7 @@ public sealed class ScanMetricsCollector : IDisposable
 
             _phases.Remove(phaseName);
 
-            var finishedAt = DateTimeOffset.UtcNow;
+            var finishedAt = _timeProvider.GetUtcNow();
             var phase = new ExecutionPhase
             {
                 MetricsId = _metricsId,
@@ -214,7 +221,7 @@ public sealed class ScanMetricsCollector : IDisposable
     public async Task CompleteAsync(CancellationToken cancellationToken = default)
     {
         _totalStopwatch.Stop();
-        var finishedAt = DateTimeOffset.UtcNow;
+        var finishedAt = _timeProvider.GetUtcNow();
 
         // Calculate phase timings
         var phases = BuildPhaseTimings();
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Explainability/Falsifiability/FalsifiabilityGenerator.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Explainability/Falsifiability/FalsifiabilityGenerator.cs
index a732bf702..639b66e2d 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Explainability/Falsifiability/FalsifiabilityGenerator.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Explainability/Falsifiability/FalsifiabilityGenerator.cs
@@ -3,6 +3,7 @@
 
 using System.Collections.Immutable;
 using Microsoft.Extensions.Logging;
+using StellaOps.Determinism;
 using StellaOps.Scanner.Explainability.Assumptions;
 
 namespace StellaOps.Scanner.Explainability.Falsifiability;
@@ -60,10 +61,17 @@ public interface IFalsifiabilityGenerator
 public sealed class FalsifiabilityGenerator : IFalsifiabilityGenerator
 {
     private readonly ILogger<FalsifiabilityGenerator> _logger;
+    private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
 
-    public FalsifiabilityGenerator(ILogger<FalsifiabilityGenerator> logger)
+    public FalsifiabilityGenerator(
+        ILogger<FalsifiabilityGenerator> logger,
+        TimeProvider? timeProvider = null,
+        IGuidProvider? guidProvider = null)
     {
         _logger = logger;
+        _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
     }
 
     /// <inheritdoc />
@@ -164,12 +172,12 @@ public sealed class FalsifiabilityGenerator : IFalsifiabilityGenerator
 
         return new FalsifiabilityCriteria
         {
-            Id = Guid.NewGuid().ToString("N"),
+            Id = _guidProvider.NewGuid().ToString("N"),
             FindingId = input.FindingId,
             Criteria = [.. criteria],
             Status = status,
             Summary = summary,
-            GeneratedAt = DateTimeOffset.UtcNow
+            GeneratedAt = _timeProvider.GetUtcNow()
         };
     }
 
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Explainability/RiskReport.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Explainability/RiskReport.cs
index cdfb7b229..8835325c1 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Explainability/RiskReport.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Explainability/RiskReport.cs
@@ -2,6 +2,7 @@
 // Copyright (c) StellaOps
 
 using System.Collections.Immutable;
+using StellaOps.Determinism;
 using StellaOps.Scanner.Explainability.Assumptions;
 using StellaOps.Scanner.Explainability.Confidence;
 using StellaOps.Scanner.Explainability.Falsifiability;
@@ -118,10 +119,17 @@ public sealed class RiskReportGenerator : IRiskReportGenerator
     private const string EngineVersionValue = "1.0.0";
 
     private readonly IEvidenceDensityScorer _scorer;
+    private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
 
-    public RiskReportGenerator(IEvidenceDensityScorer scorer)
+    public RiskReportGenerator(
+        IEvidenceDensityScorer scorer,
+        TimeProvider? timeProvider = null,
+        IGuidProvider? guidProvider = null)
     {
         _scorer = scorer;
+        _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
     }
 
     /// <inheritdoc />
@@ -140,7 +148,7 @@ public sealed class RiskReportGenerator : IRiskReportGenerator
 
         return new RiskReport
         {
-            Id = Guid.NewGuid().ToString("N"),
+            Id = _guidProvider.NewGuid().ToString("N"),
             FindingId = input.FindingId,
             VulnerabilityId = input.VulnerabilityId,
             PackageName = input.PackageName,
@@ -151,7 +159,7 @@ public sealed class RiskReportGenerator : IRiskReportGenerator
             Explanation = explanation,
             DetailedNarrative = narrative,
             RecommendedActions = [.. actions],
-            GeneratedAt = DateTimeOffset.UtcNow,
+            GeneratedAt = _timeProvider.GetUtcNow(),
             EngineVersion = EngineVersionValue
         };
     }
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Explainability/StellaOps.Scanner.Explainability.csproj b/src/Scanner/__Libraries/StellaOps.Scanner.Explainability/StellaOps.Scanner.Explainability.csproj
index 1745e392e..630a35819 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Explainability/StellaOps.Scanner.Explainability.csproj
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Explainability/StellaOps.Scanner.Explainability.csproj
@@ -12,4 +12,8 @@
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" />
   </ItemGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="../../../__Libraries/StellaOps.Determinism.Abstractions/StellaOps.Determinism.Abstractions.csproj" />
+  </ItemGroup>
+
 </Project>
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/ConnectionTesters/DockerConnectionTester.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/ConnectionTesters/DockerConnectionTester.cs
index dd1f52a9f..9d7074401 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/ConnectionTesters/DockerConnectionTester.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/ConnectionTesters/DockerConnectionTester.cs
@@ -16,6 +16,7 @@ public sealed class DockerConnectionTester : ISourceTypeConnectionTester
     private readonly IHttpClientFactory _httpClientFactory;
     private readonly ICredentialResolver _credentialResolver;
     private readonly ILogger<DockerConnectionTester> _logger;
+    private readonly TimeProvider _timeProvider;
 
     private static readonly JsonSerializerOptions JsonOptions = new()
     {
@@ -28,11 +29,13 @@ public sealed class DockerConnectionTester : ISourceTypeConnectionTester
     public DockerConnectionTester(
         IHttpClientFactory httpClientFactory,
         ICredentialResolver credentialResolver,
-        ILogger<DockerConnectionTester> logger)
+        ILogger<DockerConnectionTester> logger,
+        TimeProvider? timeProvider = null)
     {
         _httpClientFactory = httpClientFactory;
         _credentialResolver = credentialResolver;
         _logger = logger;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public async Task<ConnectionTestResult> TestAsync(
@@ -47,7 +50,7 @@ public sealed class DockerConnectionTester : ISourceTypeConnectionTester
             {
                 Success = false,
                 Message = "Invalid configuration format",
-                TestedAt = DateTimeOffset.UtcNow
+                TestedAt = _timeProvider.GetUtcNow()
             };
         }
 
@@ -100,7 +103,7 @@ public sealed class DockerConnectionTester : ISourceTypeConnectionTester
                     {
                         Success = false,
                         Message = $"Registry accessible but image test failed: {imageTestResult.Message}",
-                        TestedAt = DateTimeOffset.UtcNow,
+                        TestedAt = _timeProvider.GetUtcNow(),
                         Details = details
                     };
                 }
@@ -112,7 +115,7 @@ public sealed class DockerConnectionTester : ISourceTypeConnectionTester
                 {
                     Success = true,
                     Message = "Successfully connected to Docker registry",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = details
                 };
             }
@@ -125,21 +128,21 @@ public sealed class DockerConnectionTester : ISourceTypeConnectionTester
                 {
                     Success = false,
                     Message = "Authentication required - configure credentials",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = details
                 },
                 HttpStatusCode.Forbidden => new ConnectionTestResult
                 {
                     Success = false,
                     Message = "Access denied - check permissions",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = details
                 },
                 _ => new ConnectionTestResult
                 {
                     Success = false,
                     Message = $"Registry returned {response.StatusCode}",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = details
                 }
             };
@@ -151,7 +154,7 @@ public sealed class DockerConnectionTester : ISourceTypeConnectionTester
             {
                 Success = false,
                 Message = $"Connection failed: {ex.Message}",
-                TestedAt = DateTimeOffset.UtcNow
+                TestedAt = _timeProvider.GetUtcNow()
             };
         }
         catch (TaskCanceledException) when (!ct.IsCancellationRequested)
@@ -160,7 +163,7 @@ public sealed class DockerConnectionTester : ISourceTypeConnectionTester
             {
                 Success = false,
                 Message = "Connection timed out",
-                TestedAt = DateTimeOffset.UtcNow
+                TestedAt = _timeProvider.GetUtcNow()
             };
         }
     }
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/ConnectionTesters/GitConnectionTester.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/ConnectionTesters/GitConnectionTester.cs
index ab23aa8f0..1b79cac42 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/ConnectionTesters/GitConnectionTester.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/ConnectionTesters/GitConnectionTester.cs
@@ -16,6 +16,7 @@ public sealed class GitConnectionTester : ISourceTypeConnectionTester
     private readonly IHttpClientFactory _httpClientFactory;
     private readonly ICredentialResolver _credentialResolver;
     private readonly ILogger<GitConnectionTester> _logger;
+    private readonly TimeProvider _timeProvider;
 
     private static readonly JsonSerializerOptions JsonOptions = new()
     {
@@ -28,11 +29,13 @@ public sealed class GitConnectionTester : ISourceTypeConnectionTester
     public GitConnectionTester(
         IHttpClientFactory httpClientFactory,
         ICredentialResolver credentialResolver,
-        ILogger<GitConnectionTester> logger)
+        ILogger<GitConnectionTester> logger,
+        TimeProvider? timeProvider = null)
     {
         _httpClientFactory = httpClientFactory;
         _credentialResolver = credentialResolver;
         _logger = logger;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public async Task<ConnectionTestResult> TestAsync(
@@ -47,7 +50,7 @@ public sealed class GitConnectionTester : ISourceTypeConnectionTester
             {
                 Success = false,
                 Message = "Invalid configuration format",
-                TestedAt = DateTimeOffset.UtcNow
+                TestedAt = _timeProvider.GetUtcNow()
             };
         }
 
@@ -126,7 +129,7 @@ public sealed class GitConnectionTester : ISourceTypeConnectionTester
                 {
                     Success = true,
                     Message = "Successfully connected to Git repository",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = details
                 };
             }
@@ -139,28 +142,28 @@ public sealed class GitConnectionTester : ISourceTypeConnectionTester
                 {
                     Success = false,
                     Message = "Authentication required - configure credentials",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = details
                 },
                 HttpStatusCode.Forbidden => new ConnectionTestResult
                 {
                     Success = false,
                     Message = "Access denied - check token permissions",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = details
                 },
                 HttpStatusCode.NotFound => new ConnectionTestResult
                 {
                     Success = false,
                     Message = "Repository not found - check URL and access",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = details
                 },
                 _ => new ConnectionTestResult
                 {
                     Success = false,
                     Message = $"Server returned {response.StatusCode}",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = details
                 }
             };
@@ -172,7 +175,7 @@ public sealed class GitConnectionTester : ISourceTypeConnectionTester
             {
                 Success = false,
                 Message = $"Connection failed: {ex.Message}",
-                TestedAt = DateTimeOffset.UtcNow,
+                TestedAt = _timeProvider.GetUtcNow(),
                 Details = new Dictionary<string, object>
                 {
                     ["repositoryUrl"] = config.RepositoryUrl
@@ -185,7 +188,7 @@ public sealed class GitConnectionTester : ISourceTypeConnectionTester
             {
                 Success = false,
                 Message = "Connection timed out",
-                TestedAt = DateTimeOffset.UtcNow
+                TestedAt = _timeProvider.GetUtcNow()
             };
         }
     }
@@ -202,7 +205,7 @@ public sealed class GitConnectionTester : ISourceTypeConnectionTester
         {
             Success = true,
             Message = "SSH configuration accepted - connection will be validated on first scan",
-            TestedAt = DateTimeOffset.UtcNow,
+            TestedAt = _timeProvider.GetUtcNow(),
             Details = new Dictionary<string, object>
             {
                 ["repositoryUrl"] = config.RepositoryUrl,
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/ConnectionTesters/ZastavaConnectionTester.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/ConnectionTesters/ZastavaConnectionTester.cs
index b7c882a9b..54af754ef 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/ConnectionTesters/ZastavaConnectionTester.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/ConnectionTesters/ZastavaConnectionTester.cs
@@ -17,6 +17,7 @@ public sealed class ZastavaConnectionTester : ISourceTypeConnectionTester
     private readonly IHttpClientFactory _httpClientFactory;
     private readonly ICredentialResolver _credentialResolver;
     private readonly ILogger<ZastavaConnectionTester> _logger;
+    private readonly TimeProvider _timeProvider;
 
     private static readonly JsonSerializerOptions JsonOptions = new()
     {
@@ -29,11 +30,13 @@ public sealed class ZastavaConnectionTester : ISourceTypeConnectionTester
     public ZastavaConnectionTester(
         IHttpClientFactory httpClientFactory,
         ICredentialResolver credentialResolver,
-        ILogger<ZastavaConnectionTester> logger)
+        ILogger<ZastavaConnectionTester> logger,
+        TimeProvider? timeProvider = null)
     {
         _httpClientFactory = httpClientFactory;
         _credentialResolver = credentialResolver;
         _logger = logger;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public async Task<ConnectionTestResult> TestAsync(
@@ -48,7 +51,7 @@ public sealed class ZastavaConnectionTester : ISourceTypeConnectionTester
             {
                 Success = false,
                 Message = "Invalid configuration format",
-                TestedAt = DateTimeOffset.UtcNow
+                TestedAt = _timeProvider.GetUtcNow()
             };
         }
 
@@ -90,7 +93,7 @@ public sealed class ZastavaConnectionTester : ISourceTypeConnectionTester
                 {
                     Success = true,
                     Message = "Successfully connected to registry",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = details
                 };
             }
@@ -104,28 +107,28 @@ public sealed class ZastavaConnectionTester : ISourceTypeConnectionTester
                 {
                     Success = false,
                     Message = "Authentication failed - check credentials",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = details
                 },
                 HttpStatusCode.Forbidden => new ConnectionTestResult
                 {
                     Success = false,
                     Message = "Access denied - insufficient permissions",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = details
                 },
                 HttpStatusCode.NotFound => new ConnectionTestResult
                 {
                     Success = false,
                     Message = "Registry endpoint not found - check URL",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = details
                 },
                 _ => new ConnectionTestResult
                 {
                     Success = false,
                     Message = $"Registry returned {response.StatusCode}",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = details
                 }
             };
@@ -137,7 +140,7 @@ public sealed class ZastavaConnectionTester : ISourceTypeConnectionTester
             {
                 Success = false,
                 Message = $"Connection failed: {ex.Message}",
-                TestedAt = DateTimeOffset.UtcNow,
+                TestedAt = _timeProvider.GetUtcNow(),
                 Details = new Dictionary<string, object>
                 {
                     ["registryUrl"] = config.RegistryUrl,
@@ -151,7 +154,7 @@ public sealed class ZastavaConnectionTester : ISourceTypeConnectionTester
             {
                 Success = false,
                 Message = "Connection timed out",
-                TestedAt = DateTimeOffset.UtcNow,
+                TestedAt = _timeProvider.GetUtcNow(),
                 Details = new Dictionary<string, object>
                 {
                     ["registryUrl"] = config.RegistryUrl,
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Cli/CliSourceHandler.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Cli/CliSourceHandler.cs
index 98b49e9ec..5a67b6a78 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Cli/CliSourceHandler.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Cli/CliSourceHandler.cs
@@ -24,6 +24,7 @@ public sealed class CliSourceHandler : ISourceTypeHandler
 {
     private readonly ISourceConfigValidator _configValidator;
     private readonly ILogger<CliSourceHandler> _logger;
+    private readonly TimeProvider _timeProvider;
 
     private static readonly JsonSerializerOptions JsonOptions = new()
     {
@@ -38,10 +39,12 @@ public sealed class CliSourceHandler : ISourceTypeHandler
 
     public CliSourceHandler(
         ISourceConfigValidator configValidator,
-        ILogger<CliSourceHandler> logger)
+        ILogger<CliSourceHandler> logger,
+        TimeProvider? timeProvider = null)
     {
         _configValidator = configValidator;
         _logger = logger;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     /// <summary>
@@ -102,7 +105,7 @@ public sealed class CliSourceHandler : ISourceTypeHandler
             {
                 Success = false,
                 Message = "Invalid configuration",
-                TestedAt = DateTimeOffset.UtcNow
+                TestedAt = _timeProvider.GetUtcNow()
             });
         }
 
@@ -112,7 +115,7 @@ public sealed class CliSourceHandler : ISourceTypeHandler
         {
             Success = true,
             Message = "CLI source configuration is valid",
-            TestedAt = DateTimeOffset.UtcNow,
+            TestedAt = _timeProvider.GetUtcNow(),
             Details = new Dictionary<string, object>
             {
                 ["allowedTools"] = config.AllowedTools,
@@ -242,8 +245,8 @@ public sealed class CliSourceHandler : ISourceTypeHandler
             Token = token,
             TokenHash = Convert.ToHexString(tokenHash).ToLowerInvariant(),
             SourceId = source.SourceId,
-            ExpiresAt = DateTimeOffset.UtcNow.Add(validity),
-            CreatedAt = DateTimeOffset.UtcNow
+            ExpiresAt = _timeProvider.GetUtcNow().Add(validity),
+            CreatedAt = _timeProvider.GetUtcNow()
         };
     }
 
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Docker/DockerSourceHandler.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Docker/DockerSourceHandler.cs
index d18e54f00..6dc46bdcc 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Docker/DockerSourceHandler.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Docker/DockerSourceHandler.cs
@@ -21,6 +21,7 @@ public sealed class DockerSourceHandler : ISourceTypeHandler
     private readonly ISourceConfigValidator _configValidator;
     private readonly IImageDiscoveryService _discoveryService;
     private readonly ILogger<DockerSourceHandler> _logger;
+    private readonly TimeProvider _timeProvider;
 
     private static readonly JsonSerializerOptions JsonOptions = new()
     {
@@ -38,13 +39,15 @@ public sealed class DockerSourceHandler : ISourceTypeHandler
         ICredentialResolver credentialResolver,
         ISourceConfigValidator configValidator,
         IImageDiscoveryService discoveryService,
-        ILogger<DockerSourceHandler> logger)
+        ILogger<DockerSourceHandler> logger,
+        TimeProvider? timeProvider = null)
     {
         _clientFactory = clientFactory;
         _credentialResolver = credentialResolver;
         _configValidator = configValidator;
         _discoveryService = discoveryService;
         _logger = logger;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public async Task<IReadOnlyList<ScanTarget>> DiscoverTargetsAsync(
@@ -136,7 +139,7 @@ public sealed class DockerSourceHandler : ISourceTypeHandler
         // Apply age filter if specified
         if (imageSpec.MaxAgeHours.HasValue)
         {
-            var cutoff = DateTimeOffset.UtcNow.AddHours(-imageSpec.MaxAgeHours.Value);
+            var cutoff = _timeProvider.GetUtcNow().AddHours(-imageSpec.MaxAgeHours.Value);
             sortedTags = sortedTags
                 .Where(t => t.LastUpdated == null || t.LastUpdated >= cutoff)
                 .ToList();
@@ -181,7 +184,7 @@ public sealed class DockerSourceHandler : ISourceTypeHandler
             {
                 Success = false,
                 Message = "Invalid configuration",
-                TestedAt = DateTimeOffset.UtcNow
+                TestedAt = _timeProvider.GetUtcNow()
             };
         }
 
@@ -198,7 +201,7 @@ public sealed class DockerSourceHandler : ISourceTypeHandler
                 {
                     Success = false,
                     Message = "Registry ping failed",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = new Dictionary<string, object>
                     {
                         ["registryUrl"] = config.RegistryUrl
@@ -216,7 +219,7 @@ public sealed class DockerSourceHandler : ISourceTypeHandler
                 {
                     Success = true,
                     Message = "Successfully connected to registry",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = new Dictionary<string, object>
                     {
                         ["registryUrl"] = config.RegistryUrl,
@@ -230,7 +233,7 @@ public sealed class DockerSourceHandler : ISourceTypeHandler
             {
                 Success = true,
                 Message = "Successfully connected to registry",
-                TestedAt = DateTimeOffset.UtcNow,
+                TestedAt = _timeProvider.GetUtcNow(),
                 Details = new Dictionary<string, object>
                 {
                     ["registryUrl"] = config.RegistryUrl
@@ -244,7 +247,7 @@ public sealed class DockerSourceHandler : ISourceTypeHandler
             {
                 Success = false,
                 Message = $"Connection failed: {ex.Message}",
-                TestedAt = DateTimeOffset.UtcNow
+                TestedAt = _timeProvider.GetUtcNow()
             };
         }
     }
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Git/GitSourceHandler.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Git/GitSourceHandler.cs
index 0df2eac0c..734f3c982 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Git/GitSourceHandler.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Git/GitSourceHandler.cs
@@ -19,6 +19,7 @@ public sealed class GitSourceHandler : ISourceTypeHandler, IWebhookCapableHandle
     private readonly ICredentialResolver _credentialResolver;
     private readonly ISourceConfigValidator _configValidator;
     private readonly ILogger<GitSourceHandler> _logger;
+    private readonly TimeProvider _timeProvider;
 
     private static readonly JsonSerializerOptions JsonOptions = new()
     {
@@ -35,12 +36,14 @@ public sealed class GitSourceHandler : ISourceTypeHandler, IWebhookCapableHandle
         IGitClientFactory gitClientFactory,
         ICredentialResolver credentialResolver,
         ISourceConfigValidator configValidator,
-        ILogger<GitSourceHandler> logger)
+        ILogger<GitSourceHandler> logger,
+        TimeProvider? timeProvider = null)
     {
         _gitClientFactory = gitClientFactory;
         _credentialResolver = credentialResolver;
         _configValidator = configValidator;
         _logger = logger;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public async Task<IReadOnlyList<ScanTarget>> DiscoverTargetsAsync(
@@ -160,7 +163,7 @@ public sealed class GitSourceHandler : ISourceTypeHandler, IWebhookCapableHandle
             {
                 Success = false,
                 Message = "Invalid configuration",
-                TestedAt = DateTimeOffset.UtcNow
+                TestedAt = _timeProvider.GetUtcNow()
             };
         }
 
@@ -176,7 +179,7 @@ public sealed class GitSourceHandler : ISourceTypeHandler, IWebhookCapableHandle
                 {
                     Success = false,
                     Message = "Repository not found or inaccessible",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = new Dictionary<string, object>
                     {
                         ["repositoryUrl"] = config.RepositoryUrl,
@@ -189,7 +192,7 @@ public sealed class GitSourceHandler : ISourceTypeHandler, IWebhookCapableHandle
             {
                 Success = true,
                 Message = "Successfully connected to repository",
-                TestedAt = DateTimeOffset.UtcNow,
+                TestedAt = _timeProvider.GetUtcNow(),
                 Details = new Dictionary<string, object>
                 {
                     ["repositoryUrl"] = config.RepositoryUrl,
@@ -206,7 +209,7 @@ public sealed class GitSourceHandler : ISourceTypeHandler, IWebhookCapableHandle
             {
                 Success = false,
                 Message = $"Connection failed: {ex.Message}",
-                TestedAt = DateTimeOffset.UtcNow
+                TestedAt = _timeProvider.GetUtcNow()
             };
         }
     }
@@ -270,7 +273,7 @@ public sealed class GitSourceHandler : ISourceTypeHandler, IWebhookCapableHandle
                        sender.TryGetProperty("login", out var login)
                     ? login.GetString()
                     : null,
-                Timestamp = DateTimeOffset.UtcNow
+                Timestamp = _timeProvider.GetUtcNow()
             };
         }
 
@@ -303,7 +306,7 @@ public sealed class GitSourceHandler : ISourceTypeHandler, IWebhookCapableHandle
                         ? num.GetInt32().ToString()
                         : ""
                 },
-                Timestamp = DateTimeOffset.UtcNow
+                Timestamp = _timeProvider.GetUtcNow()
             };
         }
 
@@ -330,7 +333,7 @@ public sealed class GitSourceHandler : ISourceTypeHandler, IWebhookCapableHandle
                     Actor = root.TryGetProperty("user_name", out var userName)
                         ? userName.GetString()
                         : null,
-                    Timestamp = DateTimeOffset.UtcNow
+                    Timestamp = _timeProvider.GetUtcNow()
                 };
             }
 
@@ -361,7 +364,7 @@ public sealed class GitSourceHandler : ISourceTypeHandler, IWebhookCapableHandle
                             ? mrAction.GetString() ?? ""
                             : ""
                     },
-                    Timestamp = DateTimeOffset.UtcNow
+                    Timestamp = _timeProvider.GetUtcNow()
                 };
             }
         }
@@ -371,7 +374,7 @@ public sealed class GitSourceHandler : ISourceTypeHandler, IWebhookCapableHandle
         {
             EventType = "unknown",
             Reference = "",
-            Timestamp = DateTimeOffset.UtcNow
+            Timestamp = _timeProvider.GetUtcNow()
         };
     }
 
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Zastava/ZastavaSourceHandler.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Zastava/ZastavaSourceHandler.cs
index 0f2bd755d..4697b14ed 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Zastava/ZastavaSourceHandler.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/Zastava/ZastavaSourceHandler.cs
@@ -20,6 +20,7 @@ public sealed class ZastavaSourceHandler : ISourceTypeHandler, IWebhookCapableHa
     private readonly ICredentialResolver _credentialResolver;
     private readonly ISourceConfigValidator _configValidator;
     private readonly ILogger<ZastavaSourceHandler> _logger;
+    private readonly TimeProvider _timeProvider;
 
     private static readonly JsonSerializerOptions JsonOptions = new()
     {
@@ -36,12 +37,14 @@ public sealed class ZastavaSourceHandler : ISourceTypeHandler, IWebhookCapableHa
         IRegistryClientFactory clientFactory,
         ICredentialResolver credentialResolver,
         ISourceConfigValidator configValidator,
-        ILogger<ZastavaSourceHandler> logger)
+        ILogger<ZastavaSourceHandler> logger,
+        TimeProvider? timeProvider = null)
     {
         _clientFactory = clientFactory;
         _credentialResolver = credentialResolver;
         _configValidator = configValidator;
         _logger = logger;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public async Task<IReadOnlyList<ScanTarget>> DiscoverTargetsAsync(
@@ -167,7 +170,7 @@ public sealed class ZastavaSourceHandler : ISourceTypeHandler, IWebhookCapableHa
             {
                 Success = false,
                 Message = "Invalid configuration",
-                TestedAt = DateTimeOffset.UtcNow
+                TestedAt = _timeProvider.GetUtcNow()
             };
         }
 
@@ -183,7 +186,7 @@ public sealed class ZastavaSourceHandler : ISourceTypeHandler, IWebhookCapableHa
                 {
                     Success = false,
                     Message = "Registry ping failed",
-                    TestedAt = DateTimeOffset.UtcNow,
+                    TestedAt = _timeProvider.GetUtcNow(),
                     Details = new Dictionary<string, object>
                     {
                         ["registryUrl"] = config.RegistryUrl,
@@ -199,7 +202,7 @@ public sealed class ZastavaSourceHandler : ISourceTypeHandler, IWebhookCapableHa
             {
                 Success = true,
                 Message = "Successfully connected to registry",
-                TestedAt = DateTimeOffset.UtcNow,
+                TestedAt = _timeProvider.GetUtcNow(),
                 Details = new Dictionary<string, object>
                 {
                     ["registryUrl"] = config.RegistryUrl,
@@ -215,7 +218,7 @@ public sealed class ZastavaSourceHandler : ISourceTypeHandler, IWebhookCapableHa
             {
                 Success = false,
                 Message = $"Connection failed: {ex.Message}",
-                TestedAt = DateTimeOffset.UtcNow
+                TestedAt = _timeProvider.GetUtcNow()
             };
         }
     }
@@ -281,7 +284,7 @@ public sealed class ZastavaSourceHandler : ISourceTypeHandler, IWebhookCapableHa
                     : repository.GetProperty("name").GetString()!,
                 Tag = pushData.TryGetProperty("tag", out var tag) ? tag.GetString() : "latest",
                 Actor = pushData.TryGetProperty("pusher", out var pusher) ? pusher.GetString() : null,
-                Timestamp = DateTimeOffset.UtcNow
+                Timestamp = _timeProvider.GetUtcNow()
             };
         }
 
@@ -309,7 +312,7 @@ public sealed class ZastavaSourceHandler : ISourceTypeHandler, IWebhookCapableHa
                     ? digest.GetString()
                     : null,
                 Actor = eventData.TryGetProperty("operator", out var op) ? op.GetString() : null,
-                Timestamp = DateTimeOffset.UtcNow
+                Timestamp = _timeProvider.GetUtcNow()
             };
         }
 
@@ -338,7 +341,7 @@ public sealed class ZastavaSourceHandler : ISourceTypeHandler, IWebhookCapableHa
                        actor.TryGetProperty("name", out var actorName)
                     ? actorName.GetString()
                     : null,
-                Timestamp = DateTimeOffset.UtcNow
+                Timestamp = _timeProvider.GetUtcNow()
             };
         }
 
@@ -347,7 +350,7 @@ public sealed class ZastavaSourceHandler : ISourceTypeHandler, IWebhookCapableHa
         {
             EventType = "unknown",
             Reference = "",
-            Timestamp = DateTimeOffset.UtcNow
+            Timestamp = _timeProvider.GetUtcNow()
         };
     }
 
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Persistence/SbomSourceRepository.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Persistence/SbomSourceRepository.cs
index f458c2d79..a5bbba1d8 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Persistence/SbomSourceRepository.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Persistence/SbomSourceRepository.cs
@@ -17,12 +17,15 @@ public sealed class SbomSourceRepository : RepositoryBase<ScannerSourcesDataSour
     private const string Schema = "scanner";
     private const string Table = "sbom_sources";
     private const string FullTable = $"{Schema}.{Table}";
+    private readonly TimeProvider _timeProvider;
 
     public SbomSourceRepository(
         ScannerSourcesDataSource dataSource,
-        ILogger<SbomSourceRepository> logger)
+        ILogger<SbomSourceRepository> logger,
+        TimeProvider? timeProvider = null)
         : base(dataSource, logger)
     {
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public async Task<SbomSource?> GetByIdAsync(string tenantId, Guid sourceId, CancellationToken ct = default)
@@ -317,7 +320,7 @@ public sealed class SbomSourceRepository : RepositoryBase<ScannerSourcesDataSour
 
     public Task<IReadOnlyList<SbomSource>> GetDueForScheduledRunAsync(CancellationToken ct = default)
     {
-        return GetDueScheduledSourcesAsync(DateTimeOffset.UtcNow, 100, ct);
+        return GetDueScheduledSourcesAsync(_timeProvider.GetUtcNow(), 100, ct);
     }
 
     private void ConfigureSourceParams(NpgsqlCommand cmd, SbomSource source)
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Persistence/SbomSourceRunRepository.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Persistence/SbomSourceRunRepository.cs
index 095b9a1da..af9d1da65 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Persistence/SbomSourceRunRepository.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Persistence/SbomSourceRunRepository.cs
@@ -16,12 +16,15 @@ public sealed class SbomSourceRunRepository : RepositoryBase<ScannerSourcesDataS
     private const string Schema = "scanner";
     private const string Table = "sbom_source_runs";
     private const string FullTable = $"{Schema}.{Table}";
+    private readonly TimeProvider _timeProvider;
 
     public SbomSourceRunRepository(
         ScannerSourcesDataSource dataSource,
-        ILogger<SbomSourceRunRepository> logger)
+        ILogger<SbomSourceRunRepository> logger,
+        TimeProvider? timeProvider = null)
         : base(dataSource, logger)
     {
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public async Task<SbomSourceRun?> GetByIdAsync(Guid runId, CancellationToken ct = default)
@@ -188,7 +191,7 @@ public sealed class SbomSourceRunRepository : RepositoryBase<ScannerSourcesDataS
             sql,
             cmd =>
             {
-                AddParameter(cmd, "threshold", DateTimeOffset.UtcNow - olderThan);
+                AddParameter(cmd, "threshold", _timeProvider.GetUtcNow() - olderThan);
                 AddParameter(cmd, "limit", limit);
             },
             MapRun,
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Services/SbomSourceService.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Services/SbomSourceService.cs
index 7c84fab01..062d5c4e9 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Services/SbomSourceService.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Services/SbomSourceService.cs
@@ -17,19 +17,22 @@ public sealed class SbomSourceService : ISbomSourceService
     private readonly ISourceConfigValidator _configValidator;
     private readonly ISourceConnectionTester _connectionTester;
     private readonly ILogger<SbomSourceService> _logger;
+    private readonly TimeProvider _timeProvider;
 
     public SbomSourceService(
         ISbomSourceRepository sourceRepository,
         ISbomSourceRunRepository runRepository,
         ISourceConfigValidator configValidator,
         ISourceConnectionTester connectionTester,
-        ILogger<SbomSourceService> logger)
+        ILogger<SbomSourceService> logger,
+        TimeProvider? timeProvider = null)
     {
         _sourceRepository = sourceRepository;
         _runRepository = runRepository;
         _configValidator = configValidator;
         _connectionTester = connectionTester;
         _logger = logger;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public async Task<SourceResponse?> GetAsync(string tenantId, Guid sourceId, CancellationToken ct = default)
@@ -215,7 +218,7 @@ public sealed class SbomSourceService : ISbomSourceService
         }
 
         // Touch updated fields
-        SetProperty(source, "UpdatedAt", DateTimeOffset.UtcNow);
+        SetProperty(source, "UpdatedAt", _timeProvider.GetUtcNow());
         SetProperty(source, "UpdatedBy", updatedBy);
 
         await _sourceRepository.UpdateAsync(source, ct);
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Services/SourceConnectionTester.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Services/SourceConnectionTester.cs
index fc4b026de..414544518 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Services/SourceConnectionTester.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Services/SourceConnectionTester.cs
@@ -12,13 +12,16 @@ public sealed class SourceConnectionTester : ISourceConnectionTester
 {
     private readonly IEnumerable<ISourceTypeConnectionTester> _testers;
     private readonly ILogger<SourceConnectionTester> _logger;
+    private readonly TimeProvider _timeProvider;
 
     public SourceConnectionTester(
         IEnumerable<ISourceTypeConnectionTester> testers,
-        ILogger<SourceConnectionTester> logger)
+        ILogger<SourceConnectionTester> logger,
+        TimeProvider? timeProvider = null)
     {
         _testers = testers;
         _logger = logger;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public Task<ConnectionTestResult> TestAsync(SbomSource source, CancellationToken ct = default)
@@ -42,7 +45,7 @@ public sealed class SourceConnectionTester : ISourceConnectionTester
             {
                 Success = false,
                 Message = $"No connection tester available for source type {source.SourceType}",
-                TestedAt = DateTimeOffset.UtcNow
+                TestedAt = _timeProvider.GetUtcNow()
             };
         }
 
@@ -74,7 +77,7 @@ public sealed class SourceConnectionTester : ISourceConnectionTester
             {
                 Success = false,
                 Message = $"Connection test error: {ex.Message}",
-                TestedAt = DateTimeOffset.UtcNow,
+                TestedAt = _timeProvider.GetUtcNow(),
                 Details = new Dictionary<string, object>
                 {
                     ["exceptionType"] = ex.GetType().Name
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/StellaOps.Scanner.Sources.csproj b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/StellaOps.Scanner.Sources.csproj
index c7ae907cc..7c5698a72 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/StellaOps.Scanner.Sources.csproj
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/StellaOps.Scanner.Sources.csproj
@@ -22,5 +22,6 @@
   <ItemGroup>
     <ProjectReference Include="../../../__Libraries/StellaOps.Infrastructure.Postgres/StellaOps.Infrastructure.Postgres.csproj" />
     <ProjectReference Include="../../../__Libraries/StellaOps.Cryptography/StellaOps.Cryptography.csproj" />
+    <ProjectReference Include="../../../__Libraries/StellaOps.Determinism.Abstractions/StellaOps.Determinism.Abstractions.csproj" />
   </ItemGroup>
 </Project>
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Triggers/SourceTriggerDispatcher.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Triggers/SourceTriggerDispatcher.cs
index 80e072ea8..6a8736e4d 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Triggers/SourceTriggerDispatcher.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Sources/Triggers/SourceTriggerDispatcher.cs
@@ -1,4 +1,5 @@
 using Microsoft.Extensions.Logging;
+using StellaOps.Determinism;
 using StellaOps.Scanner.Sources.Domain;
 using StellaOps.Scanner.Sources.Handlers;
 using StellaOps.Scanner.Sources.Persistence;
@@ -15,19 +16,25 @@ public sealed class SourceTriggerDispatcher : ISourceTriggerDispatcher
     private readonly IEnumerable<ISourceTypeHandler> _handlers;
     private readonly IScanJobQueue _scanJobQueue;
     private readonly ILogger<SourceTriggerDispatcher> _logger;
+    private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
 
     public SourceTriggerDispatcher(
         ISbomSourceRepository sourceRepository,
         ISbomSourceRunRepository runRepository,
         IEnumerable<ISourceTypeHandler> handlers,
         IScanJobQueue scanJobQueue,
-        ILogger<SourceTriggerDispatcher> logger)
+        ILogger<SourceTriggerDispatcher> logger,
+        TimeProvider? timeProvider = null,
+        IGuidProvider? guidProvider = null)
     {
         _sourceRepository = sourceRepository;
         _runRepository = runRepository;
         _handlers = handlers;
         _scanJobQueue = scanJobQueue;
         _logger = logger;
+        _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
     }
 
     public Task<TriggerDispatchResult> DispatchAsync(
@@ -40,7 +47,7 @@ public sealed class SourceTriggerDispatcher : ISourceTriggerDispatcher
         {
             Trigger = trigger,
             TriggerDetails = triggerDetails,
-            CorrelationId = Guid.NewGuid().ToString("N")
+            CorrelationId = _guidProvider.NewGuid().ToString("N")
         };
 
         return DispatchAsync(sourceId, context, ct);
@@ -128,7 +135,7 @@ public sealed class SourceTriggerDispatcher : ISourceTriggerDispatcher
             {
                 run.Complete();
                 await _runRepository.UpdateAsync(run, ct);
-                source.RecordSuccessfulRun(DateTimeOffset.UtcNow);
+                source.RecordSuccessfulRun(_timeProvider.GetUtcNow());
                 await _sourceRepository.UpdateAsync(source, ct);
 
                 return new TriggerDispatchResult
@@ -170,12 +177,12 @@ public sealed class SourceTriggerDispatcher : ISourceTriggerDispatcher
             if (run.ItemsFailed == run.ItemsDiscovered)
             {
                 run.Fail("All targets failed to queue");
-                source.RecordFailedRun(DateTimeOffset.UtcNow, run.ErrorMessage!);
+                source.RecordFailedRun(_timeProvider.GetUtcNow(), run.ErrorMessage!);
             }
             else
             {
                 run.Complete();
-                source.RecordSuccessfulRun(DateTimeOffset.UtcNow);
+                source.RecordSuccessfulRun(_timeProvider.GetUtcNow());
             }
 
             await _runRepository.UpdateAsync(run, ct);
@@ -195,7 +202,7 @@ public sealed class SourceTriggerDispatcher : ISourceTriggerDispatcher
             run.Fail(ex.Message);
             await _runRepository.UpdateAsync(run, ct);
 
-            source.RecordFailedRun(DateTimeOffset.UtcNow, ex.Message);
+            source.RecordFailedRun(_timeProvider.GetUtcNow(), ex.Message);
             await _sourceRepository.UpdateAsync(source, ct);
 
             return new TriggerDispatchResult
@@ -247,7 +254,7 @@ public sealed class SourceTriggerDispatcher : ISourceTriggerDispatcher
         {
             Trigger = originalRun.Trigger,
             TriggerDetails = $"Retry of run {originalRunId}",
-            CorrelationId = Guid.NewGuid().ToString("N"),
+            CorrelationId = _guidProvider.NewGuid().ToString("N"),
             Metadata = new() { ["originalRunId"] = originalRunId.ToString() }
         };
 
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Storage.Oci/SlicePullService.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Storage.Oci/SlicePullService.cs
index bb7ab1987..1809aea01 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Storage.Oci/SlicePullService.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Storage.Oci/SlicePullService.cs
@@ -61,6 +61,7 @@ public sealed class SlicePullService : IDisposable
     private readonly OciRegistryAuthorization _authorization;
     private readonly SlicePullOptions _options;
     private readonly ILogger<SlicePullService> _logger;
+    private readonly TimeProvider _timeProvider;
     private readonly Dictionary<string, CachedSlice> _cache = new(StringComparer.Ordinal);
     private readonly Lock _cacheLock = new();
 
@@ -70,12 +71,14 @@ public sealed class SlicePullService : IDisposable
         HttpClient httpClient,
         OciRegistryAuthorization authorization,
         SlicePullOptions? options = null,
-        ILogger<SlicePullService>? logger = null)
+        ILogger<SlicePullService>? logger = null,
+        TimeProvider? timeProvider = null)
     {
         _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
         _authorization = authorization ?? throw new ArgumentNullException(nameof(authorization));
         _options = options ?? new SlicePullOptions();
         _logger = logger ?? Microsoft.Extensions.Logging.Abstractions.NullLogger<SlicePullService>.Instance;
+        _timeProvider = timeProvider ?? TimeProvider.System;
         _httpClient.Timeout = _options.RequestTimeout;
     }
 
@@ -211,7 +214,7 @@ public sealed class SlicePullService : IDisposable
             var dsseLayer = manifest.Layers?.FirstOrDefault(l =>
                 l.MediaType == OciMediaTypes.DsseEnvelope);
 
-            if (dsseLayer != null && _options.VerifySignature)
+            if (dsseLayer?.Digest != null && _options.VerifySignature)
             {
                 var dsseResult = await FetchAndVerifyDsseAsync(reference, dsseLayer.Digest, sliceBytes, cancellationToken)
                     .ConfigureAwait(false);
@@ -227,7 +230,7 @@ public sealed class SlicePullService : IDisposable
                     SliceData = sliceData,
                     DsseEnvelope = dsseEnvelope,
                     SignatureVerified = signatureVerified,
-                    ExpiresAt = DateTimeOffset.UtcNow.Add(_options.CacheTtl)
+                    ExpiresAt = _timeProvider.GetUtcNow().Add(_options.CacheTtl)
                 });
             }
 
@@ -411,7 +414,7 @@ public sealed class SlicePullService : IDisposable
         {
             if (_cache.TryGetValue(key, out cached))
             {
-                if (cached.ExpiresAt > DateTimeOffset.UtcNow)
+                if (cached.ExpiresAt > _timeProvider.GetUtcNow())
                 {
                     return true;
                 }
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Postgres/PostgresFuncProofRepository.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Postgres/PostgresFuncProofRepository.cs
index 8412b8f04..ae4bcb466 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Postgres/PostgresFuncProofRepository.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Postgres/PostgresFuncProofRepository.cs
@@ -8,6 +8,7 @@
 using System.Text.Json;
 using Npgsql;
 using NpgsqlTypes;
+using StellaOps.Determinism;
 using StellaOps.Scanner.Storage.Entities;
 
 namespace StellaOps.Scanner.Storage.Postgres;
@@ -64,10 +65,17 @@ public interface IFuncProofRepository
 public sealed class PostgresFuncProofRepository : IFuncProofRepository
 {
     private readonly NpgsqlDataSource _dataSource;
+    private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
 
-    public PostgresFuncProofRepository(NpgsqlDataSource dataSource)
+    public PostgresFuncProofRepository(
+        NpgsqlDataSource dataSource,
+        TimeProvider? timeProvider = null,
+        IGuidProvider? guidProvider = null)
     {
         _dataSource = dataSource ?? throw new ArgumentNullException(nameof(dataSource));
+        _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
     }
 
     public async Task<Guid> StoreAsync(FuncProofDocumentRow document, CancellationToken ct = default)
@@ -94,7 +102,7 @@ public sealed class PostgresFuncProofRepository : IFuncProofRepository
         await using var conn = await _dataSource.OpenConnectionAsync(ct);
         await using var cmd = new NpgsqlCommand(sql, conn);
 
-        var id = document.Id == Guid.Empty ? Guid.NewGuid() : document.Id;
+        var id = document.Id == Guid.Empty ? _guidProvider.NewGuid() : document.Id;
 
         cmd.Parameters.AddWithValue("id", id);
         cmd.Parameters.AddWithValue("scan_id", document.ScanId);
@@ -118,7 +126,7 @@ public sealed class PostgresFuncProofRepository : IFuncProofRepository
             document.RekorEntryId is null ? DBNull.Value : document.RekorEntryId);
         cmd.Parameters.AddWithValue("generator_version", document.GeneratorVersion);
         cmd.Parameters.AddWithValue("generated_at_utc", document.GeneratedAtUtc);
-        cmd.Parameters.AddWithValue("created_at_utc", DateTimeOffset.UtcNow);
+        cmd.Parameters.AddWithValue("created_at_utc", _timeProvider.GetUtcNow());
 
         var result = await cmd.ExecuteScalarAsync(ct);
         return result is Guid returnedId ? returnedId : id;
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Postgres/PostgresIdempotencyKeyRepository.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Postgres/PostgresIdempotencyKeyRepository.cs
index 2866db042..3761245d1 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Postgres/PostgresIdempotencyKeyRepository.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Postgres/PostgresIdempotencyKeyRepository.cs
@@ -8,6 +8,7 @@
 using Dapper;
 using Microsoft.Extensions.Logging;
 using Npgsql;
+using StellaOps.Determinism;
 using StellaOps.Scanner.Storage.Entities;
 using StellaOps.Scanner.Storage.Repositories;
 
@@ -20,14 +21,17 @@ public sealed class PostgresIdempotencyKeyRepository : IIdempotencyKeyRepository
 {
     private readonly ScannerDataSource _dataSource;
     private readonly ILogger<PostgresIdempotencyKeyRepository> _logger;
+    private readonly IGuidProvider _guidProvider;
     private string SchemaName => _dataSource.SchemaName ?? ScannerDataSource.DefaultSchema;
 
     public PostgresIdempotencyKeyRepository(
         ScannerDataSource dataSource,
-        ILogger<PostgresIdempotencyKeyRepository> logger)
+        ILogger<PostgresIdempotencyKeyRepository> logger,
+        IGuidProvider? guidProvider = null)
     {
         _dataSource = dataSource ?? throw new ArgumentNullException(nameof(dataSource));
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
     }
 
     /// <inheritdoc />
@@ -68,7 +72,7 @@ public sealed class PostgresIdempotencyKeyRepository : IIdempotencyKeyRepository
     {
         if (key.KeyId == Guid.Empty)
         {
-            key.KeyId = Guid.NewGuid();
+            key.KeyId = _guidProvider.NewGuid();
         }
 
         var sql = $"""
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Repositories/PostgresProofSpineRepository.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Repositories/PostgresProofSpineRepository.cs
index c1a026b0d..e2bf7a4fe 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Repositories/PostgresProofSpineRepository.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Repositories/PostgresProofSpineRepository.cs
@@ -2,6 +2,7 @@ using System.Text.Json;
 using System.Text.Json.Serialization;
 using Microsoft.Extensions.Logging;
 using Npgsql;
+using StellaOps.Determinism;
 using StellaOps.Infrastructure.Postgres.Repositories;
 using StellaOps.Replay.Core;
 using StellaOps.Scanner.ProofSpine;
@@ -28,14 +29,17 @@ public sealed class PostgresProofSpineRepository : RepositoryBase<ScannerDataSou
     };
 
     private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
 
     public PostgresProofSpineRepository(
         ScannerDataSource dataSource,
         ILogger<PostgresProofSpineRepository> logger,
-        TimeProvider? timeProvider = null)
+        TimeProvider? timeProvider = null,
+        IGuidProvider? guidProvider = null)
         : base(dataSource, logger)
     {
         _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
     }
 
     public Task<ProofSpineModel?> GetByIdAsync(string spineId, CancellationToken cancellationToken = default)
@@ -249,7 +253,7 @@ public sealed class PostgresProofSpineRepository : RepositoryBase<ScannerDataSou
             await using (var command = CreateCommand(insertHistory, connection))
             {
                 command.Transaction = transaction;
-                AddParameter(command, "id", Guid.NewGuid().ToString("N"));
+                AddParameter(command, "id", _guidProvider.NewGuid().ToString("N"));
                 AddParameter(command, "old_spine_id", oldSpineId.Trim());
                 AddParameter(command, "new_spine_id", newSpineId.Trim());
                 AddParameter(command, "reason", reason);
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Repositories/PostgresScanMetricsRepository.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Repositories/PostgresScanMetricsRepository.cs
index 9e0339962..d03020573 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Repositories/PostgresScanMetricsRepository.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Repositories/PostgresScanMetricsRepository.cs
@@ -8,6 +8,7 @@
 using System.Text.Json;
 using Microsoft.Extensions.Logging;
 using Npgsql;
+using StellaOps.Determinism;
 using StellaOps.Scanner.Storage.Models;
 
 namespace StellaOps.Scanner.Storage.Repositories;
@@ -19,13 +20,16 @@ public sealed class PostgresScanMetricsRepository : IScanMetricsRepository
 {
     private readonly NpgsqlDataSource _dataSource;
     private readonly ILogger<PostgresScanMetricsRepository> _logger;
+    private readonly IGuidProvider _guidProvider;
 
     public PostgresScanMetricsRepository(
         NpgsqlDataSource dataSource,
-        ILogger<PostgresScanMetricsRepository> logger)
+        ILogger<PostgresScanMetricsRepository> logger,
+        IGuidProvider? guidProvider = null)
     {
         _dataSource = dataSource ?? throw new ArgumentNullException(nameof(dataSource));
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
     }
 
     /// <inheritdoc/>
@@ -67,7 +71,7 @@ public sealed class PostgresScanMetricsRepository : IScanMetricsRepository
 
         await using var cmd = _dataSource.CreateCommand(sql);
 
-        var metricsId = metrics.MetricsId == Guid.Empty ? Guid.NewGuid() : metrics.MetricsId;
+        var metricsId = metrics.MetricsId == Guid.Empty ? _guidProvider.NewGuid() : metrics.MetricsId;
 
         cmd.Parameters.AddWithValue("metricsId", metricsId);
         cmd.Parameters.AddWithValue("scanId", metrics.ScanId);
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Repositories/RuntimeEventRepository.cs b/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Repositories/RuntimeEventRepository.cs
index 33afdfd8c..d03a618b4 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Repositories/RuntimeEventRepository.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Storage/Repositories/RuntimeEventRepository.cs
@@ -1,6 +1,7 @@
 using System.Text.Json;
 using Microsoft.Extensions.Logging;
 using Npgsql;
+using StellaOps.Determinism;
 using StellaOps.Infrastructure.Postgres.Repositories;
 using StellaOps.Scanner.Storage.Catalog;
 using StellaOps.Scanner.Storage.Postgres;
@@ -16,10 +17,15 @@ public sealed class RuntimeEventRepository : RepositoryBase<ScannerDataSource>
     private string Table => $"{SchemaName}.runtime_events";
     private string SchemaName => DataSource.SchemaName ?? ScannerDataSource.DefaultSchema;
     private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web);
+    private readonly IGuidProvider _guidProvider;
 
-    public RuntimeEventRepository(ScannerDataSource dataSource, ILogger<RuntimeEventRepository> logger)
+    public RuntimeEventRepository(
+        ScannerDataSource dataSource,
+        ILogger<RuntimeEventRepository> logger,
+        IGuidProvider? guidProvider = null)
         : base(dataSource, logger)
     {
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
     }
 
     public async Task<RuntimeEventInsertResult> InsertAsync(
@@ -52,7 +58,7 @@ public sealed class RuntimeEventRepository : RepositoryBase<ScannerDataSource>
         foreach (var document in documents)
         {
             cancellationToken.ThrowIfCancellationRequested();
-            var id = string.IsNullOrWhiteSpace(document.Id) ? Guid.NewGuid().ToString("N") : document.Id;
+            var id = string.IsNullOrWhiteSpace(document.Id) ? _guidProvider.NewGuid().ToString("N") : document.Id;
 
             var rows = await ExecuteAsync(
                 Tenant,
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.Storage/StellaOps.Scanner.Storage.csproj b/src/Scanner/__Libraries/StellaOps.Scanner.Storage/StellaOps.Scanner.Storage.csproj
index 7126d56e8..651e1a7a1 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.Storage/StellaOps.Scanner.Storage.csproj
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.Storage/StellaOps.Scanner.Storage.csproj
@@ -28,5 +28,6 @@
     <ProjectReference Include="..\\StellaOps.Scanner.SmartDiff\\StellaOps.Scanner.SmartDiff.csproj" />
     <ProjectReference Include="..\\..\\..\\__Libraries\\StellaOps.Infrastructure.Postgres\\StellaOps.Infrastructure.Postgres.csproj" />
     <ProjectReference Include="..\\..\\..\\Router\\__Libraries\\StellaOps.Messaging\\StellaOps.Messaging.csproj" />
+    <ProjectReference Include="..\\..\\..\\__Libraries\\StellaOps.Determinism.Abstractions\\StellaOps.Determinism.Abstractions.csproj" />
   </ItemGroup>
 </Project>
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.VulnSurfaces/StellaOps.Scanner.VulnSurfaces.csproj b/src/Scanner/__Libraries/StellaOps.Scanner.VulnSurfaces/StellaOps.Scanner.VulnSurfaces.csproj
index dcc0297bf..881d429ff 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.VulnSurfaces/StellaOps.Scanner.VulnSurfaces.csproj
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.VulnSurfaces/StellaOps.Scanner.VulnSurfaces.csproj
@@ -21,5 +21,6 @@
 
   <ItemGroup>
     <ProjectReference Include="..\StellaOps.Scanner.Core\StellaOps.Scanner.Core.csproj" />
+    <ProjectReference Include="../../../__Libraries/StellaOps.Determinism.Abstractions/StellaOps.Determinism.Abstractions.csproj" />
   </ItemGroup>
 </Project>
diff --git a/src/Scanner/__Libraries/StellaOps.Scanner.VulnSurfaces/Storage/PostgresVulnSurfaceRepository.cs b/src/Scanner/__Libraries/StellaOps.Scanner.VulnSurfaces/Storage/PostgresVulnSurfaceRepository.cs
index 38d718dc2..706538d95 100644
--- a/src/Scanner/__Libraries/StellaOps.Scanner.VulnSurfaces/Storage/PostgresVulnSurfaceRepository.cs
+++ b/src/Scanner/__Libraries/StellaOps.Scanner.VulnSurfaces/Storage/PostgresVulnSurfaceRepository.cs
@@ -7,6 +7,7 @@
 
 using Microsoft.Extensions.Logging;
 using Npgsql;
+using StellaOps.Determinism;
 using StellaOps.Scanner.VulnSurfaces.Models;
 
 namespace StellaOps.Scanner.VulnSurfaces.Storage;
@@ -18,15 +19,18 @@ public sealed class PostgresVulnSurfaceRepository : IVulnSurfaceRepository
 {
     private readonly NpgsqlDataSource _dataSource;
     private readonly ILogger<PostgresVulnSurfaceRepository> _logger;
+    private readonly IGuidProvider _guidProvider;
     private readonly int _commandTimeoutSeconds;
 
     public PostgresVulnSurfaceRepository(
         NpgsqlDataSource dataSource,
         ILogger<PostgresVulnSurfaceRepository> logger,
+        IGuidProvider? guidProvider = null,
         int commandTimeoutSeconds = 30)
     {
         _dataSource = dataSource ?? throw new ArgumentNullException(nameof(dataSource));
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
         _commandTimeoutSeconds = commandTimeoutSeconds;
     }
 
@@ -45,7 +49,7 @@ public sealed class PostgresVulnSurfaceRepository : IVulnSurfaceRepository
         string? attestationDigest,
         CancellationToken cancellationToken = default)
     {
-        var id = Guid.NewGuid();
+        var id = _guidProvider.NewGuid();
 
         const string sql = """
             INSERT INTO scanner.vuln_surfaces (
@@ -106,7 +110,7 @@ public sealed class PostgresVulnSurfaceRepository : IVulnSurfaceRepository
         string? fixedHash,
         CancellationToken cancellationToken = default)
     {
-        var id = Guid.NewGuid();
+        var id = _guidProvider.NewGuid();
 
         const string sql = """
             INSERT INTO scanner.vuln_surface_sinks (
@@ -148,7 +152,7 @@ public sealed class PostgresVulnSurfaceRepository : IVulnSurfaceRepository
         double confidence,
         CancellationToken cancellationToken = default)
     {
-        var id = Guid.NewGuid();
+        var id = _guidProvider.NewGuid();
 
         const string sql = """
             INSERT INTO scanner.vuln_surface_triggers (
diff --git a/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/Auditing/InMemorySignerAuditSink.cs b/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/Auditing/InMemorySignerAuditSink.cs
index 4015d0d08..3cf7075fa 100644
--- a/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/Auditing/InMemorySignerAuditSink.cs
+++ b/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/Auditing/InMemorySignerAuditSink.cs
@@ -3,6 +3,7 @@ using System.Collections.Concurrent;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.Extensions.Logging;
+using StellaOps.Determinism;
 using StellaOps.Signer.Core;
 
 namespace StellaOps.Signer.Infrastructure.Auditing;
@@ -11,11 +12,16 @@ public sealed class InMemorySignerAuditSink : ISignerAuditSink
 {
     private readonly ConcurrentDictionary<string, SignerAuditEntry> _entries = new(StringComparer.Ordinal);
     private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
     private readonly ILogger<InMemorySignerAuditSink> _logger;
 
-    public InMemorySignerAuditSink(TimeProvider timeProvider, ILogger<InMemorySignerAuditSink> logger)
+    public InMemorySignerAuditSink(
+        TimeProvider timeProvider,
+        ILogger<InMemorySignerAuditSink> logger,
+        IGuidProvider? guidProvider = null)
     {
         _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
     }
 
@@ -30,7 +36,7 @@ public sealed class InMemorySignerAuditSink : ISignerAuditSink
         ArgumentNullException.ThrowIfNull(entitlement);
         ArgumentNullException.ThrowIfNull(caller);
 
-        var auditId = Guid.NewGuid().ToString("d");
+        var auditId = _guidProvider.NewGuid().ToString("d");
         var entry = new SignerAuditEntry(
             auditId,
             _timeProvider.GetUtcNow(),
diff --git a/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/Signing/DefaultSigningKeyResolver.cs b/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/Signing/DefaultSigningKeyResolver.cs
index 1b8b1e7b8..40bd265cc 100644
--- a/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/Signing/DefaultSigningKeyResolver.cs
+++ b/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/Signing/DefaultSigningKeyResolver.cs
@@ -3,6 +3,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
+using StellaOps.Determinism;
 using StellaOps.Signer.Core;
 
 namespace StellaOps.Signer.Infrastructure.Signing;
@@ -17,15 +18,18 @@ public sealed class DefaultSigningKeyResolver : ISigningKeyResolver
 
     private readonly DsseSignerOptions _options;
     private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
     private readonly ILogger<DefaultSigningKeyResolver> _logger;
 
     public DefaultSigningKeyResolver(
         IOptions<DsseSignerOptions> options,
         TimeProvider timeProvider,
-        ILogger<DefaultSigningKeyResolver> logger)
+        ILogger<DefaultSigningKeyResolver> logger,
+        IGuidProvider? guidProvider = null)
     {
         _options = options?.Value ?? throw new ArgumentNullException(nameof(options));
         _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
     }
 
@@ -56,7 +60,7 @@ public sealed class DefaultSigningKeyResolver : ISigningKeyResolver
     {
         // Generate ephemeral key identifier using timestamp for uniqueness
         var now = _timeProvider.GetUtcNow();
-        var keyId = $"{KeylessKeyIdPrefix}{tenant}:{now:yyyyMMddHHmmss}:{Guid.NewGuid():N}";
+        var keyId = $"{KeylessKeyIdPrefix}{tenant}:{now:yyyyMMddHHmmss}:{_guidProvider.NewGuid():N}";
         var expiresAt = now.AddMinutes(KeylessExpiryMinutes);
 
         return new SigningKeyResolution(
diff --git a/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/Sigstore/SigstoreSigningService.cs b/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/Sigstore/SigstoreSigningService.cs
index 0525b5f77..1c5c04fa4 100644
--- a/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/Sigstore/SigstoreSigningService.cs
+++ b/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/Sigstore/SigstoreSigningService.cs
@@ -18,17 +18,20 @@ public sealed class SigstoreSigningService : ISigstoreSigningService
     private readonly IFulcioClient _fulcioClient;
     private readonly IRekorClient _rekorClient;
     private readonly SigstoreOptions _options;
+    private readonly TimeProvider _timeProvider;
     private readonly ILogger<SigstoreSigningService> _logger;
 
     public SigstoreSigningService(
         IFulcioClient fulcioClient,
         IRekorClient rekorClient,
         IOptions<SigstoreOptions> options,
-        ILogger<SigstoreSigningService> logger)
+        ILogger<SigstoreSigningService> logger,
+        TimeProvider? timeProvider = null)
     {
         _fulcioClient = fulcioClient ?? throw new ArgumentNullException(nameof(fulcioClient));
         _rekorClient = rekorClient ?? throw new ArgumentNullException(nameof(rekorClient));
         _options = options?.Value ?? throw new ArgumentNullException(nameof(options));
+        _timeProvider = timeProvider ?? TimeProvider.System;
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
     }
 
@@ -133,7 +136,7 @@ public sealed class SigstoreSigningService : ISigstoreSigningService
             }
 
             // 3. Check certificate validity
-            var now = DateTimeOffset.UtcNow;
+            var now = _timeProvider.GetUtcNow();
             if (now < cert.NotBefore || now > cert.NotAfter)
             {
                 _logger.LogWarning(
diff --git a/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/StellaOps.Signer.Infrastructure.csproj b/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/StellaOps.Signer.Infrastructure.csproj
index 0716d53d4..6f736a41f 100644
--- a/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/StellaOps.Signer.Infrastructure.csproj
+++ b/src/Signer/StellaOps.Signer/StellaOps.Signer.Infrastructure/StellaOps.Signer.Infrastructure.csproj
@@ -9,6 +9,7 @@
   <ItemGroup>
     <ProjectReference Include="..\StellaOps.Signer.Core\StellaOps.Signer.Core.csproj" />
     <ProjectReference Include="..\..\..\__Libraries\StellaOps.Cryptography\StellaOps.Cryptography.csproj" />
+    <ProjectReference Include="..\..\..\__Libraries\StellaOps.Determinism.Abstractions\StellaOps.Determinism.Abstractions.csproj" />
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" />
diff --git a/src/Signer/StellaOps.Signer/StellaOps.Signer.WebService/Endpoints/KeyRotationEndpoints.cs b/src/Signer/StellaOps.Signer/StellaOps.Signer.WebService/Endpoints/KeyRotationEndpoints.cs
index 06d968018..643df9f6a 100644
--- a/src/Signer/StellaOps.Signer/StellaOps.Signer.WebService/Endpoints/KeyRotationEndpoints.cs
+++ b/src/Signer/StellaOps.Signer/StellaOps.Signer.WebService/Endpoints/KeyRotationEndpoints.cs
@@ -145,6 +145,7 @@ public static class KeyRotationEndpoints
         [FromBody] RevokeKeyRequestDto request,
         IKeyRotationService rotationService,
         ILoggerFactory loggerFactory,
+        TimeProvider timeProvider,
         CancellationToken ct)
     {
         var logger = loggerFactory.CreateLogger("KeyRotationEndpoints.RevokeKey");
@@ -183,7 +184,7 @@ public static class KeyRotationEndpoints
             {
                 KeyId = keyId,
                 AnchorId = anchorId,
-                RevokedAt = request.EffectiveAt ?? DateTimeOffset.UtcNow,
+                RevokedAt = request.EffectiveAt ?? timeProvider.GetUtcNow(),
                 Reason = request.Reason,
                 AllowedKeyIds = result.AllowedKeyIds.ToList(),
                 RevokedKeyIds = result.RevokedKeyIds.ToList(),
@@ -217,9 +218,10 @@ public static class KeyRotationEndpoints
         [FromRoute] string keyId,
         [FromQuery] DateTimeOffset? signedAt,
         IKeyRotationService rotationService,
+        TimeProvider timeProvider,
         CancellationToken ct)
     {
-        var checkTime = signedAt ?? DateTimeOffset.UtcNow;
+        var checkTime = signedAt ?? timeProvider.GetUtcNow();
 
         try
         {
diff --git a/src/Signer/StellaOps.Signer/StellaOps.Signer.WebService/Program.cs b/src/Signer/StellaOps.Signer/StellaOps.Signer.WebService/Program.cs
index 954f3b18c..a8d466e53 100644
--- a/src/Signer/StellaOps.Signer/StellaOps.Signer.WebService/Program.cs
+++ b/src/Signer/StellaOps.Signer/StellaOps.Signer.WebService/Program.cs
@@ -17,8 +17,14 @@ builder.Services.AddAuthentication(StubBearerAuthenticationDefaults.Authenticati
 builder.Services.AddAuthorization();
 
 builder.Services.AddSignerPipeline();
+
+// Configure TimeProvider for deterministic testing support
+builder.Services.AddSingleton(TimeProvider.System);
+
 builder.Services.Configure<SignerEntitlementOptions>(options =>
 {
+    // Note: Using 1-hour expiry for demo/test tokens. 
+    // Actual expiry is calculated at runtime relative to TimeProvider.
     options.Tokens["valid-poe"] = new SignerEntitlementDefinition(
         LicenseId: "LIC-TEST",
         CustomerId: "CUST-TEST",
diff --git a/src/Signer/__Libraries/StellaOps.Signer.KeyManagement/KeyRotationService.cs b/src/Signer/__Libraries/StellaOps.Signer.KeyManagement/KeyRotationService.cs
index 354942ecc..97309456f 100644
--- a/src/Signer/__Libraries/StellaOps.Signer.KeyManagement/KeyRotationService.cs
+++ b/src/Signer/__Libraries/StellaOps.Signer.KeyManagement/KeyRotationService.cs
@@ -8,6 +8,7 @@ using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 
+using StellaOps.Determinism;
 using StellaOps.Signer.KeyManagement.Entities;
 
 namespace StellaOps.Signer.KeyManagement;
@@ -22,17 +23,20 @@ public sealed class KeyRotationService : IKeyRotationService
     private readonly ILogger<KeyRotationService> _logger;
     private readonly KeyRotationOptions _options;
     private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
 
     public KeyRotationService(
         KeyManagementDbContext dbContext,
         ILogger<KeyRotationService> logger,
         IOptions<KeyRotationOptions> options,
-        TimeProvider? timeProvider = null)
+        TimeProvider? timeProvider = null,
+        IGuidProvider? guidProvider = null)
     {
         _dbContext = dbContext ?? throw new ArgumentNullException(nameof(dbContext));
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
         _options = options?.Value ?? new KeyRotationOptions();
         _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
     }
 
     /// <inheritdoc />
@@ -85,7 +89,7 @@ public sealed class KeyRotationService : IKeyRotationService
             // Create key history entry
             var keyEntry = new KeyHistoryEntity
             {
-                HistoryId = Guid.NewGuid(),
+                HistoryId = _guidProvider.NewGuid(),
                 AnchorId = anchorId,
                 KeyId = request.KeyId,
                 PublicKey = request.PublicKey,
@@ -106,7 +110,7 @@ public sealed class KeyRotationService : IKeyRotationService
             // Create audit log entry
             var auditEntry = new KeyAuditLogEntity
             {
-                LogId = Guid.NewGuid(),
+                LogId = _guidProvider.NewGuid(),
                 AnchorId = anchorId,
                 KeyId = request.KeyId,
                 Operation = KeyOperation.Add,
@@ -209,7 +213,7 @@ public sealed class KeyRotationService : IKeyRotationService
             // Create audit log entry
             var auditEntry = new KeyAuditLogEntity
             {
-                LogId = Guid.NewGuid(),
+                LogId = _guidProvider.NewGuid(),
                 AnchorId = anchorId,
                 KeyId = keyId,
                 Operation = KeyOperation.Revoke,
diff --git a/src/Signer/__Libraries/StellaOps.Signer.KeyManagement/StellaOps.Signer.KeyManagement.csproj b/src/Signer/__Libraries/StellaOps.Signer.KeyManagement/StellaOps.Signer.KeyManagement.csproj
index 0ae41ecc9..8303b32d9 100644
--- a/src/Signer/__Libraries/StellaOps.Signer.KeyManagement/StellaOps.Signer.KeyManagement.csproj
+++ b/src/Signer/__Libraries/StellaOps.Signer.KeyManagement/StellaOps.Signer.KeyManagement.csproj
@@ -15,6 +15,10 @@
     <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" />
   </ItemGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\__Libraries\StellaOps.Determinism.Abstractions\StellaOps.Determinism.Abstractions.csproj" />
+  </ItemGroup>
+
   <ItemGroup>
     <None Include="Migrations\*.sql">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
diff --git a/src/Signer/__Libraries/StellaOps.Signer.KeyManagement/TrustAnchorManager.cs b/src/Signer/__Libraries/StellaOps.Signer.KeyManagement/TrustAnchorManager.cs
index 87502a6e0..a9e741605 100644
--- a/src/Signer/__Libraries/StellaOps.Signer.KeyManagement/TrustAnchorManager.cs
+++ b/src/Signer/__Libraries/StellaOps.Signer.KeyManagement/TrustAnchorManager.cs
@@ -8,6 +8,7 @@ using System.Threading.Tasks;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging;
 
+using StellaOps.Determinism;
 using StellaOps.Signer.KeyManagement.Entities;
 
 namespace StellaOps.Signer.KeyManagement;
@@ -22,17 +23,20 @@ public sealed class TrustAnchorManager : ITrustAnchorManager
     private readonly IKeyRotationService _keyRotationService;
     private readonly ILogger<TrustAnchorManager> _logger;
     private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
 
     public TrustAnchorManager(
         KeyManagementDbContext dbContext,
         IKeyRotationService keyRotationService,
         ILogger<TrustAnchorManager> logger,
-        TimeProvider? timeProvider = null)
+        TimeProvider? timeProvider = null,
+        IGuidProvider? guidProvider = null)
     {
         _dbContext = dbContext ?? throw new ArgumentNullException(nameof(dbContext));
         _keyRotationService = keyRotationService ?? throw new ArgumentNullException(nameof(keyRotationService));
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
         _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
     }
 
     /// <inheritdoc />
@@ -115,7 +119,7 @@ public sealed class TrustAnchorManager : ITrustAnchorManager
 
         var entity = new TrustAnchorEntity
         {
-            AnchorId = Guid.NewGuid(),
+            AnchorId = _guidProvider.NewGuid(),
             PurlPattern = request.PurlPattern,
             AllowedKeyIds = request.AllowedKeyIds?.ToList() ?? [],
             AllowedPredicateTypes = request.AllowedPredicateTypes?.ToList(),
diff --git a/src/Signer/__Libraries/StellaOps.Signer.Keyless/AmbientOidcTokenProvider.cs b/src/Signer/__Libraries/StellaOps.Signer.Keyless/AmbientOidcTokenProvider.cs
index 4d764944a..ba3cf58f6 100644
--- a/src/Signer/__Libraries/StellaOps.Signer.Keyless/AmbientOidcTokenProvider.cs
+++ b/src/Signer/__Libraries/StellaOps.Signer.Keyless/AmbientOidcTokenProvider.cs
@@ -21,13 +21,15 @@ public sealed class AmbientOidcTokenProvider : IOidcTokenProvider, IDisposable
     private readonly JwtSecurityTokenHandler _tokenHandler;
     private readonly SemaphoreSlim _lock = new(1, 1);
     private readonly FileSystemWatcher? _watcher;
+    private readonly TimeProvider _timeProvider;
 
     private OidcTokenResult? _cachedToken;
     private bool _disposed;
 
     public AmbientOidcTokenProvider(
         OidcAmbientConfig config,
-        ILogger<AmbientOidcTokenProvider> logger)
+        ILogger<AmbientOidcTokenProvider> logger,
+        TimeProvider? timeProvider = null)
     {
         ArgumentNullException.ThrowIfNull(config);
         ArgumentNullException.ThrowIfNull(logger);
@@ -35,6 +37,7 @@ public sealed class AmbientOidcTokenProvider : IOidcTokenProvider, IDisposable
         _config = config;
         _logger = logger;
         _tokenHandler = new JwtSecurityTokenHandler();
+        _timeProvider = timeProvider ?? TimeProvider.System;
 
         if (_config.WatchForChanges && File.Exists(_config.TokenPath))
         {
@@ -65,7 +68,8 @@ public sealed class AmbientOidcTokenProvider : IOidcTokenProvider, IDisposable
         try
         {
             // Check cache first
-            if (_cachedToken is not null && !_cachedToken.WillExpireSoon(TimeSpan.FromSeconds(30)))
+            var now = _timeProvider.GetUtcNow();
+            if (_cachedToken is not null && !_cachedToken.WillExpireSoon(now, TimeSpan.FromSeconds(30)))
             {
                 return _cachedToken;
             }
@@ -111,7 +115,7 @@ public sealed class AmbientOidcTokenProvider : IOidcTokenProvider, IDisposable
     public OidcTokenResult? GetCachedToken()
     {
         var cached = _cachedToken;
-        if (cached is null || cached.IsExpired)
+        if (cached is null || cached.IsExpiredAt(_timeProvider.GetUtcNow()))
         {
             return null;
         }
@@ -132,7 +136,7 @@ public sealed class AmbientOidcTokenProvider : IOidcTokenProvider, IDisposable
 
             var expiresAt = jwt.ValidTo != DateTime.MinValue
                 ? new DateTimeOffset(jwt.ValidTo, TimeSpan.Zero)
-                : DateTimeOffset.UtcNow.AddHours(1); // Default if no exp claim
+                : _timeProvider.GetUtcNow().AddHours(1); // Default if no exp claim
 
             var subject = jwt.Subject;
             var email = jwt.Claims.FirstOrDefault(c => c.Type == "email")?.Value;
diff --git a/src/Signer/__Libraries/StellaOps.Signer.Keyless/EphemeralKeyPair.cs b/src/Signer/__Libraries/StellaOps.Signer.Keyless/EphemeralKeyPair.cs
index 38230fcc8..659db2b15 100644
--- a/src/Signer/__Libraries/StellaOps.Signer.Keyless/EphemeralKeyPair.cs
+++ b/src/Signer/__Libraries/StellaOps.Signer.Keyless/EphemeralKeyPair.cs
@@ -47,7 +47,8 @@ public sealed class EphemeralKeyPair : IDisposable
     /// <param name="publicKey">The public key bytes.</param>
     /// <param name="privateKey">The private key bytes (will be copied).</param>
     /// <param name="algorithm">The algorithm identifier.</param>
-    public EphemeralKeyPair(byte[] publicKey, byte[] privateKey, string algorithm)
+    /// <param name="timeProvider">Optional time provider for deterministic timestamp.</param>
+    public EphemeralKeyPair(byte[] publicKey, byte[] privateKey, string algorithm, TimeProvider? timeProvider = null)
     {
         ArgumentNullException.ThrowIfNull(publicKey);
         ArgumentNullException.ThrowIfNull(privateKey);
@@ -56,7 +57,7 @@ public sealed class EphemeralKeyPair : IDisposable
         _publicKey = (byte[])publicKey.Clone();
         _privateKey = (byte[])privateKey.Clone();
         Algorithm = algorithm;
-        CreatedAt = DateTimeOffset.UtcNow;
+        CreatedAt = (timeProvider ?? TimeProvider.System).GetUtcNow();
     }
 
     /// <summary>
diff --git a/src/Signer/__Libraries/StellaOps.Signer.Keyless/IFulcioClient.cs b/src/Signer/__Libraries/StellaOps.Signer.Keyless/IFulcioClient.cs
index b2fb7cd65..8d23590b8 100644
--- a/src/Signer/__Libraries/StellaOps.Signer.Keyless/IFulcioClient.cs
+++ b/src/Signer/__Libraries/StellaOps.Signer.Keyless/IFulcioClient.cs
@@ -75,9 +75,11 @@ public sealed record FulcioCertificateResult(
     public TimeSpan Validity => NotAfter - NotBefore;
 
     /// <summary>
-    /// Checks if the certificate is currently valid.
+    /// Checks if the certificate is valid at the specified time.
     /// </summary>
-    public bool IsValid => DateTimeOffset.UtcNow >= NotBefore && DateTimeOffset.UtcNow <= NotAfter;
+    /// <param name="at">The time to check validity against.</param>
+    /// <returns>True if the certificate is valid at the specified time.</returns>
+    public bool IsValidAt(DateTimeOffset at) => at >= NotBefore && at <= NotAfter;
 
     /// <summary>
     /// Gets the full certificate chain including the leaf certificate.
diff --git a/src/Signer/__Libraries/StellaOps.Signer.Keyless/IOidcTokenProvider.cs b/src/Signer/__Libraries/StellaOps.Signer.Keyless/IOidcTokenProvider.cs
index a247f6e69..085678a21 100644
--- a/src/Signer/__Libraries/StellaOps.Signer.Keyless/IOidcTokenProvider.cs
+++ b/src/Signer/__Libraries/StellaOps.Signer.Keyless/IOidcTokenProvider.cs
@@ -62,15 +62,20 @@ public sealed record OidcTokenResult
     public string? Email { get; init; }
 
     /// <summary>
-    /// Whether the token is expired.
+    /// Checks whether the token is expired at the specified time.
     /// </summary>
-    public bool IsExpired => DateTimeOffset.UtcNow >= ExpiresAt;
+    /// <param name="now">The time to check against.</param>
+    /// <returns>True if the token is expired.</returns>
+    public bool IsExpiredAt(DateTimeOffset now) => now >= ExpiresAt;
 
     /// <summary>
-    /// Whether the token will expire within the specified buffer time.
+    /// Checks whether the token will expire within the specified buffer time.
     /// </summary>
-    public bool WillExpireSoon(TimeSpan buffer) =>
-        DateTimeOffset.UtcNow.Add(buffer) >= ExpiresAt;
+    /// <param name="now">The current time.</param>
+    /// <param name="buffer">The time buffer before expiration.</param>
+    /// <returns>True if the token will expire soon.</returns>
+    public bool WillExpireSoon(DateTimeOffset now, TimeSpan buffer) =>
+        now.Add(buffer) >= ExpiresAt;
 }
 
 /// <summary>
diff --git a/src/VexLens/StellaOps.VexLens.Persistence/Postgres/PostgresConsensusProjectionStore.cs b/src/VexLens/StellaOps.VexLens.Persistence/Postgres/PostgresConsensusProjectionStore.cs
index c3a751915..214e9c3dd 100644
--- a/src/VexLens/StellaOps.VexLens.Persistence/Postgres/PostgresConsensusProjectionStore.cs
+++ b/src/VexLens/StellaOps.VexLens.Persistence/Postgres/PostgresConsensusProjectionStore.cs
@@ -8,6 +8,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.Extensions.Logging;
 using Npgsql;
+using StellaOps.Determinism;
 using StellaOps.VexLens.Consensus;
 using StellaOps.VexLens.Models;
 using StellaOps.VexLens.Storage;
@@ -26,16 +27,19 @@ public sealed class PostgresConsensusProjectionStore : IConsensusProjectionStore
     private readonly IConsensusEventEmitter? _eventEmitter;
     private readonly ILogger<PostgresConsensusProjectionStore> _logger;
     private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
 
     public PostgresConsensusProjectionStore(
         NpgsqlDataSource dataSource,
         ILogger<PostgresConsensusProjectionStore> logger,
         TimeProvider? timeProvider = null,
+        IGuidProvider? guidProvider = null,
         IConsensusEventEmitter? eventEmitter = null)
     {
         _dataSource = dataSource ?? throw new ArgumentNullException(nameof(dataSource));
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
         _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? new SystemGuidProvider();
         _eventEmitter = eventEmitter;
     }
 
@@ -52,7 +56,7 @@ public sealed class PostgresConsensusProjectionStore : IConsensusProjectionStore
         activity?.SetTag("vulnerabilityId", result.VulnerabilityId);
         activity?.SetTag("productKey", result.ProductKey);
 
-        var projectionId = Guid.NewGuid();
+        var projectionId = _guidProvider.NewGuid();
         var now = _timeProvider.GetUtcNow();
 
         // Check for previous projection to track history
@@ -527,7 +531,7 @@ public sealed class PostgresConsensusProjectionStore : IConsensusProjectionStore
         // Always emit computed event
         await _eventEmitter.EmitConsensusComputedAsync(
             new ConsensusComputedEvent(
-                EventId: Guid.NewGuid().ToString(),
+                EventId: _guidProvider.NewGuid().ToString(),
                 ProjectionId: projection.ProjectionId,
                 VulnerabilityId: projection.VulnerabilityId,
                 ProductKey: projection.ProductKey,
@@ -546,7 +550,7 @@ public sealed class PostgresConsensusProjectionStore : IConsensusProjectionStore
         {
             await _eventEmitter.EmitStatusChangedAsync(
                 new ConsensusStatusChangedEvent(
-                    EventId: Guid.NewGuid().ToString(),
+                    EventId: _guidProvider.NewGuid().ToString(),
                     ProjectionId: projection.ProjectionId,
                     VulnerabilityId: projection.VulnerabilityId,
                     ProductKey: projection.ProductKey,
@@ -564,7 +568,7 @@ public sealed class PostgresConsensusProjectionStore : IConsensusProjectionStore
         {
             await _eventEmitter.EmitConflictDetectedAsync(
                 new ConsensusConflictDetectedEvent(
-                    EventId: Guid.NewGuid().ToString(),
+                    EventId: _guidProvider.NewGuid().ToString(),
                     ProjectionId: projection.ProjectionId,
                     VulnerabilityId: projection.VulnerabilityId,
                     ProductKey: projection.ProductKey,
diff --git a/src/VexLens/StellaOps.VexLens.Persistence/StellaOps.VexLens.Persistence.csproj b/src/VexLens/StellaOps.VexLens.Persistence/StellaOps.VexLens.Persistence.csproj
index aeec85e52..6a1d6144c 100644
--- a/src/VexLens/StellaOps.VexLens.Persistence/StellaOps.VexLens.Persistence.csproj
+++ b/src/VexLens/StellaOps.VexLens.Persistence/StellaOps.VexLens.Persistence.csproj
@@ -18,6 +18,7 @@
   <ItemGroup>
     <ProjectReference Include="..\StellaOps.VexLens\StellaOps.VexLens.csproj" />
     <ProjectReference Include="..\..\__Libraries\StellaOps.Infrastructure.Postgres\StellaOps.Infrastructure.Postgres.csproj" />
+    <ProjectReference Include="..\..\__Libraries\StellaOps.Determinism.Abstractions\StellaOps.Determinism.Abstractions.csproj" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/VexLens/StellaOps.VexLens.WebService/Extensions/VexLensEndpointExtensions.cs b/src/VexLens/StellaOps.VexLens.WebService/Extensions/VexLensEndpointExtensions.cs
index 8523a50cf..d92b32460 100644
--- a/src/VexLens/StellaOps.VexLens.WebService/Extensions/VexLensEndpointExtensions.cs
+++ b/src/VexLens/StellaOps.VexLens.WebService/Extensions/VexLensEndpointExtensions.cs
@@ -325,6 +325,7 @@ public static class VexLensEndpointExtensions
         [FromQuery] DateTimeOffset? fromDate,
         [FromQuery] DateTimeOffset? toDate,
         [FromServices] IGatingStatisticsStore statsStore,
+        [FromServices] TimeProvider timeProvider,
         HttpContext context,
         CancellationToken cancellationToken)
     {
@@ -340,7 +341,7 @@ public static class VexLensEndpointExtensions
             TotalSurfaced: stats.TotalSurfaced,
             TotalDamped: stats.TotalDamped,
             AverageDampingPercent: stats.AverageDampingPercent,
-            ComputedAt: DateTimeOffset.UtcNow));
+            ComputedAt: timeProvider.GetUtcNow()));
     }
 
     private static async Task<IResult> GateSnapshotAsync(
diff --git a/src/VexLens/StellaOps.VexLens/Api/IConsensusRationaleService.cs b/src/VexLens/StellaOps.VexLens/Api/IConsensusRationaleService.cs
index 24aeb73db..a466a00ee 100644
--- a/src/VexLens/StellaOps.VexLens/Api/IConsensusRationaleService.cs
+++ b/src/VexLens/StellaOps.VexLens/Api/IConsensusRationaleService.cs
@@ -1,5 +1,6 @@
 using System.Security.Cryptography;
 using System.Text;
+using StellaOps.Determinism;
 using StellaOps.VexLens.Consensus;
 using StellaOps.VexLens.Models;
 using StellaOps.VexLens.Storage;
@@ -43,17 +44,20 @@ public sealed class ConsensusRationaleService : IConsensusRationaleService
     private readonly IConsensusProjectionStore _projectionStore;
     private readonly IVexConsensusEngine _consensusEngine;
     private readonly ITrustWeightEngine _trustWeightEngine;
+    private readonly IGuidProvider _guidProvider;
 
     private const string AlgorithmVersion = "1.0.0";
 
     public ConsensusRationaleService(
         IConsensusProjectionStore projectionStore,
         IVexConsensusEngine consensusEngine,
-        ITrustWeightEngine trustWeightEngine)
+        ITrustWeightEngine trustWeightEngine,
+        IGuidProvider? guidProvider = null)
     {
         _projectionStore = projectionStore;
         _consensusEngine = consensusEngine;
         _trustWeightEngine = trustWeightEngine;
+        _guidProvider = guidProvider ?? new SystemGuidProvider();
     }
 
     public async Task<GenerateRationaleResponse> GenerateRationaleAsync(
@@ -177,7 +181,7 @@ public sealed class ConsensusRationaleService : IConsensusRationaleService
         var outputHash = ComputeOutputHash(result, contributions, conflicts);
 
         var rationale = new DetailedConsensusRationale(
-            RationaleId: $"rat-{Guid.NewGuid():N}",
+            RationaleId: $"rat-{_guidProvider.NewGuid():N}",
             VulnerabilityId: result.VulnerabilityId,
             ProductKey: result.ProductKey,
             ConsensusStatus: result.ConsensusStatus,
diff --git a/src/VexLens/StellaOps.VexLens/Api/IVexLensApiService.cs b/src/VexLens/StellaOps.VexLens/Api/IVexLensApiService.cs
index d12f2a697..6c0c65fe1 100644
--- a/src/VexLens/StellaOps.VexLens/Api/IVexLensApiService.cs
+++ b/src/VexLens/StellaOps.VexLens/Api/IVexLensApiService.cs
@@ -137,19 +137,22 @@ public sealed class VexLensApiService : IVexLensApiService
     private readonly IConsensusProjectionStore _projectionStore;
     private readonly IIssuerDirectory _issuerDirectory;
     private readonly IVexStatementProvider _statementProvider;
+    private readonly TimeProvider _timeProvider;
 
     public VexLensApiService(
         IVexConsensusEngine consensusEngine,
         ITrustWeightEngine trustWeightEngine,
         IConsensusProjectionStore projectionStore,
         IIssuerDirectory issuerDirectory,
-        IVexStatementProvider statementProvider)
+        IVexStatementProvider statementProvider,
+        TimeProvider? timeProvider = null)
     {
         _consensusEngine = consensusEngine;
         _trustWeightEngine = trustWeightEngine;
         _projectionStore = projectionStore;
         _issuerDirectory = issuerDirectory;
         _statementProvider = statementProvider;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public async Task<ComputeConsensusResponse> ComputeConsensusAsync(
@@ -164,7 +167,7 @@ public sealed class VexLensApiService : IVexLensApiService
             cancellationToken);
 
         // Compute trust weights
-        var now = DateTimeOffset.UtcNow;
+        var now = _timeProvider.GetUtcNow();
         var weightedStatements = new List<WeightedStatement>();
 
         foreach (var stmt in statements)
@@ -237,7 +240,7 @@ public sealed class VexLensApiService : IVexLensApiService
             cancellationToken);
 
         // Compute trust weights
-        var now = DateTimeOffset.UtcNow;
+        var now = _timeProvider.GetUtcNow();
         var weightedStatements = new List<WeightedStatement>();
 
         foreach (var stmt in statements)
@@ -293,7 +296,7 @@ public sealed class VexLensApiService : IVexLensApiService
         var resolutionResult = await _consensusEngine.ComputeConsensusWithProofAsync(
             consensusRequest,
             proofContext,
-            TimeProvider.System,
+            _timeProvider,
             cancellationToken);
 
         // Store result if requested
@@ -348,7 +351,7 @@ public sealed class VexLensApiService : IVexLensApiService
             TotalCount: request.Targets.Count,
             SuccessCount: results.Count,
             FailureCount: failures,
-            CompletedAt: DateTimeOffset.UtcNow);
+            CompletedAt: _timeProvider.GetUtcNow());
     }
 
     public async Task<ProjectionDetailResponse?> GetProjectionAsync(
@@ -452,7 +455,7 @@ public sealed class VexLensApiService : IVexLensApiService
 
         var withConflicts = projections.Count(p => p.ConflictCount > 0);
 
-        var last24h = DateTimeOffset.UtcNow.AddDays(-1);
+        var last24h = _timeProvider.GetUtcNow().AddDays(-1);
         var changesLast24h = projections.Count(p => p.StatusChanged && p.ComputedAt >= last24h);
 
         return new ConsensusStatisticsResponse(
@@ -462,7 +465,7 @@ public sealed class VexLensApiService : IVexLensApiService
             AverageConfidence: avgConfidence,
             ProjectionsWithConflicts: withConflicts,
             StatusChangesLast24h: changesLast24h,
-            ComputedAt: DateTimeOffset.UtcNow);
+            ComputedAt: _timeProvider.GetUtcNow());
     }
 
     public async Task<IssuerListResponse> ListIssuersAsync(
diff --git a/src/VexLens/StellaOps.VexLens/Api/TrustScorecardApiModels.cs b/src/VexLens/StellaOps.VexLens/Api/TrustScorecardApiModels.cs
index 342d4b559..af8daf8c1 100644
--- a/src/VexLens/StellaOps.VexLens/Api/TrustScorecardApiModels.cs
+++ b/src/VexLens/StellaOps.VexLens/Api/TrustScorecardApiModels.cs
@@ -472,15 +472,18 @@ public sealed class TrustScorecardApiService : ITrustScorecardApiService
     private readonly ISourceTrustScoreCalculator _scoreCalculator;
     private readonly IConflictAuditStore? _auditStore;
     private readonly ITrustScoreHistoryStore? _historyStore;
+    private readonly TimeProvider _timeProvider;
 
     public TrustScorecardApiService(
         ISourceTrustScoreCalculator scoreCalculator,
         IConflictAuditStore? auditStore = null,
-        ITrustScoreHistoryStore? historyStore = null)
+        ITrustScoreHistoryStore? historyStore = null,
+        TimeProvider? timeProvider = null)
     {
         _scoreCalculator = scoreCalculator;
         _auditStore = auditStore;
         _historyStore = historyStore;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public async Task<TrustScorecardResponse> GetScorecardAsync(
@@ -544,7 +547,7 @@ public sealed class TrustScorecardApiService : ITrustScorecardApiService
                 SignatureValidityRate = cachedScore.Breakdown.Verification.SignatureValidityRate,
                 VerificationMethod = cachedScore.Breakdown.Verification.IssuerVerified ? "registry" : null
             },
-            GeneratedAt = DateTimeOffset.UtcNow
+            GeneratedAt = _timeProvider.GetUtcNow()
         };
     }
 
@@ -604,10 +607,11 @@ public sealed class TrustScorecardApiService : ITrustScorecardApiService
             };
         }
 
+        var now = _timeProvider.GetUtcNow();
         var history = await _historyStore.GetHistoryAsync(
             sourceId,
-            DateTimeOffset.UtcNow.AddDays(-days),
-            DateTimeOffset.UtcNow,
+            now.AddDays(-days),
+            now,
             cancellationToken);
 
         if (history.Count == 0)
@@ -622,7 +626,7 @@ public sealed class TrustScorecardApiService : ITrustScorecardApiService
 
         var current = history.LastOrDefault()?.CompositeScore ?? 0.0;
         var thirtyDaysAgo = history
-            .Where(h => h.Timestamp >= DateTimeOffset.UtcNow.AddDays(-30))
+            .Where(h => h.Timestamp >= now.AddDays(-30))
             .FirstOrDefault()?.CompositeScore ?? current;
         var ninetyDaysAgo = history.FirstOrDefault()?.CompositeScore ?? current;
 
diff --git a/src/VexLens/StellaOps.VexLens/Caching/IConsensusRationaleCache.cs b/src/VexLens/StellaOps.VexLens/Caching/IConsensusRationaleCache.cs
index 7d93e4867..ae2570189 100644
--- a/src/VexLens/StellaOps.VexLens/Caching/IConsensusRationaleCache.cs
+++ b/src/VexLens/StellaOps.VexLens/Caching/IConsensusRationaleCache.cs
@@ -138,14 +138,16 @@ public sealed class InMemoryConsensusRationaleCache : IConsensusRationaleCache
     private readonly Dictionary<string, CacheEntry> _cache = new();
     private readonly object _lock = new();
     private readonly int _maxEntries;
+    private readonly TimeProvider _timeProvider;
 
     private long _hitCount;
     private long _missCount;
     private DateTimeOffset? _lastCleared;
 
-    public InMemoryConsensusRationaleCache(int maxEntries = 10000)
+    public InMemoryConsensusRationaleCache(int maxEntries = 10000, TimeProvider? timeProvider = null)
     {
         _maxEntries = maxEntries;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public Task<DetailedConsensusRationale?> GetAsync(
@@ -163,7 +165,7 @@ public sealed class InMemoryConsensusRationaleCache : IConsensusRationaleCache
                     return Task.FromResult<DetailedConsensusRationale?>(null);
                 }
 
-                entry.LastAccessed = DateTimeOffset.UtcNow;
+                entry.LastAccessed = _timeProvider.GetUtcNow();
                 Interlocked.Increment(ref _hitCount);
                 return Task.FromResult<DetailedConsensusRationale?>(entry.Rationale);
             }
@@ -187,12 +189,13 @@ public sealed class InMemoryConsensusRationaleCache : IConsensusRationaleCache
                 EvictOldestEntry();
             }
 
+            var now = _timeProvider.GetUtcNow();
             _cache[cacheKey] = new CacheEntry
             {
                 Rationale = rationale,
                 Options = options ?? new CacheOptions(),
-                Created = DateTimeOffset.UtcNow,
-                LastAccessed = DateTimeOffset.UtcNow
+                Created = now,
+                LastAccessed = now
             };
 
             return Task.CompletedTask;
@@ -254,7 +257,7 @@ public sealed class InMemoryConsensusRationaleCache : IConsensusRationaleCache
         lock (_lock)
         {
             _cache.Clear();
-            _lastCleared = DateTimeOffset.UtcNow;
+            _lastCleared = _timeProvider.GetUtcNow();
             return Task.CompletedTask;
         }
     }
@@ -277,9 +280,9 @@ public sealed class InMemoryConsensusRationaleCache : IConsensusRationaleCache
         }
     }
 
-    private static bool IsExpired(CacheEntry entry)
+    private bool IsExpired(CacheEntry entry)
     {
-        var now = DateTimeOffset.UtcNow;
+        var now = _timeProvider.GetUtcNow();
 
         if (entry.Options.AbsoluteExpiration.HasValue &&
             now >= entry.Options.AbsoluteExpiration.Value)
diff --git a/src/VexLens/StellaOps.VexLens/Consensus/VexConsensusEngine.cs b/src/VexLens/StellaOps.VexLens/Consensus/VexConsensusEngine.cs
index 0c4422ba7..40e634aee 100644
--- a/src/VexLens/StellaOps.VexLens/Consensus/VexConsensusEngine.cs
+++ b/src/VexLens/StellaOps.VexLens/Consensus/VexConsensusEngine.cs
@@ -13,10 +13,14 @@ namespace StellaOps.VexLens.Consensus;
 public sealed class VexConsensusEngine : IVexConsensusEngine
 {
     private ConsensusConfiguration _configuration;
+    private readonly TimeProvider _timeProvider;
 
-    public VexConsensusEngine(ConsensusConfiguration? configuration = null)
+    public VexConsensusEngine(
+        ConsensusConfiguration? configuration = null,
+        TimeProvider? timeProvider = null)
     {
         _configuration = configuration ?? CreateDefaultConfiguration();
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public Task<VexConsensusResult> ComputeConsensusAsync(
@@ -559,7 +563,7 @@ public sealed class VexConsensusEngine : IVexConsensusEngine
                 stmt.Statement.Status,
                 stmt.Statement.Justification,
                 weight,
-                GetStatementTimestamp(stmt.Statement),
+                GetStatementTimestamp(stmt.Statement, _timeProvider),
                 HasSignature(stmt.Weight));
         }
 
@@ -574,7 +578,7 @@ public sealed class VexConsensusEngine : IVexConsensusEngine
                 stmt.Statement.Status,
                 stmt.Statement.Justification,
                 weight,
-                GetStatementTimestamp(stmt.Statement),
+                GetStatementTimestamp(stmt.Statement, _timeProvider),
                 HasSignature(stmt.Weight),
                 reason);
         }
@@ -704,7 +708,7 @@ public sealed class VexConsensusEngine : IVexConsensusEngine
                 stmt.Statement.Status,
                 stmt.Statement.Justification,
                 weight,
-                GetStatementTimestamp(stmt.Statement),
+                GetStatementTimestamp(stmt.Statement, _timeProvider),
                 HasSignature(stmt.Weight));
         }
 
@@ -719,7 +723,7 @@ public sealed class VexConsensusEngine : IVexConsensusEngine
                 stmt.Statement.Status,
                 stmt.Statement.Justification,
                 weight,
-                GetStatementTimestamp(stmt.Statement),
+                GetStatementTimestamp(stmt.Statement, _timeProvider),
                 HasSignature(stmt.Weight),
                 reason);
         }
@@ -1278,10 +1282,10 @@ public sealed class VexConsensusEngine : IVexConsensusEngine
                 (decimal)breakdown.StatusSpecificityWeight));
     }
 
-    private static DateTimeOffset GetStatementTimestamp(NormalizedStatement statement)
+    private static DateTimeOffset GetStatementTimestamp(NormalizedStatement statement, TimeProvider timeProvider)
     {
         // Use LastSeen if available, otherwise FirstSeen, otherwise current time
-        return statement.LastSeen ?? statement.FirstSeen ?? DateTimeOffset.UtcNow;
+        return statement.LastSeen ?? statement.FirstSeen ?? timeProvider.GetUtcNow();
     }
 
     private static bool HasSignature(Trust.TrustWeightResult weight)
diff --git a/src/VexLens/StellaOps.VexLens/Export/IConsensusExportService.cs b/src/VexLens/StellaOps.VexLens/Export/IConsensusExportService.cs
index 804e36cb2..40f2e0d39 100644
--- a/src/VexLens/StellaOps.VexLens/Export/IConsensusExportService.cs
+++ b/src/VexLens/StellaOps.VexLens/Export/IConsensusExportService.cs
@@ -1,4 +1,5 @@
 using System.Text.Json;
+using StellaOps.Determinism;
 using StellaOps.VexLens.Consensus;
 using StellaOps.VexLens.Models;
 using StellaOps.VexLens.Storage;
@@ -273,12 +274,19 @@ public enum ExportFormat
 public sealed class ConsensusExportService : IConsensusExportService
 {
     private readonly IConsensusProjectionStore _projectionStore;
+    private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
 
     private const string SnapshotVersion = "1.0.0";
 
-    public ConsensusExportService(IConsensusProjectionStore projectionStore)
+    public ConsensusExportService(
+        IConsensusProjectionStore projectionStore,
+        TimeProvider? timeProvider = null,
+        IGuidProvider? guidProvider = null)
     {
         _projectionStore = projectionStore;
+        _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? new SystemGuidProvider();
     }
 
     public async Task<ConsensusSnapshot> CreateSnapshotAsync(
@@ -338,12 +346,12 @@ public sealed class ConsensusExportService : IConsensusExportService
             .GroupBy(p => p.Status)
             .ToDictionary(g => g.Key, g => g.Count());
 
-        var snapshotId = $"snap-{Guid.NewGuid():N}";
+        var snapshotId = $"snap-{_guidProvider.NewGuid():N}";
         var contentHash = ComputeContentHash(projections);
 
         return new ConsensusSnapshot(
             SnapshotId: snapshotId,
-            CreatedAt: DateTimeOffset.UtcNow,
+            CreatedAt: _timeProvider.GetUtcNow(),
             Version: SnapshotVersion,
             TenantId: request.TenantId,
             Projections: projections,
@@ -400,13 +408,13 @@ public sealed class ConsensusExportService : IConsensusExportService
 
         // For a true incremental, we'd compare with the previous snapshot
         // Here we just return new/updated since the timestamp
-        var snapshotId = $"snap-inc-{Guid.NewGuid():N}";
+        var snapshotId = $"snap-inc-{_guidProvider.NewGuid():N}";
         var contentHash = ComputeContentHash(current.Projections);
 
         return new IncrementalSnapshot(
             SnapshotId: snapshotId,
             PreviousSnapshotId: lastSnapshotId,
-            CreatedAt: DateTimeOffset.UtcNow,
+            CreatedAt: _timeProvider.GetUtcNow(),
             Version: SnapshotVersion,
             Added: current.Projections,
             Removed: [], // Would need previous snapshot to determine removed
diff --git a/src/VexLens/StellaOps.VexLens/Normalization/CsafVexNormalizer.cs b/src/VexLens/StellaOps.VexLens/Normalization/CsafVexNormalizer.cs
index dc30d43b4..571f183c8 100644
--- a/src/VexLens/StellaOps.VexLens/Normalization/CsafVexNormalizer.cs
+++ b/src/VexLens/StellaOps.VexLens/Normalization/CsafVexNormalizer.cs
@@ -2,6 +2,7 @@ using System.Diagnostics;
 using System.Security.Cryptography;
 using System.Text;
 using System.Text.Json;
+using StellaOps.Determinism;
 using StellaOps.VexLens.Models;
 
 namespace StellaOps.VexLens.Normalization;
@@ -12,6 +13,13 @@ namespace StellaOps.VexLens.Normalization;
 /// </summary>
 public sealed class CsafVexNormalizer : IVexNormalizer
 {
+    private readonly IGuidProvider _guidProvider;
+
+    public CsafVexNormalizer(IGuidProvider? guidProvider = null)
+    {
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
+    }
+
     public VexSourceFormat SourceFormat => VexSourceFormat.CsafVex;
 
     public bool CanNormalize(string content)
@@ -77,7 +85,7 @@ public sealed class CsafVexNormalizer : IVexNormalizer
             var documentId = ExtractDocumentId(documentElement);
             if (string.IsNullOrWhiteSpace(documentId))
             {
-                documentId = $"csaf:{Guid.NewGuid():N}";
+                documentId = $"csaf:{_guidProvider.NewGuid():N}";
                 warnings.Add(new NormalizationWarning(
                     "WARN_CSAF_001",
                     "Document tracking ID not found; generated a random ID",
diff --git a/src/VexLens/StellaOps.VexLens/Normalization/CycloneDxVexNormalizer.cs b/src/VexLens/StellaOps.VexLens/Normalization/CycloneDxVexNormalizer.cs
index 218a4f422..98e36acfb 100644
--- a/src/VexLens/StellaOps.VexLens/Normalization/CycloneDxVexNormalizer.cs
+++ b/src/VexLens/StellaOps.VexLens/Normalization/CycloneDxVexNormalizer.cs
@@ -2,6 +2,7 @@ using System.Diagnostics;
 using System.Security.Cryptography;
 using System.Text;
 using System.Text.Json;
+using StellaOps.Determinism;
 using StellaOps.VexLens.Models;
 
 namespace StellaOps.VexLens.Normalization;
@@ -12,6 +13,13 @@ namespace StellaOps.VexLens.Normalization;
 /// </summary>
 public sealed class CycloneDxVexNormalizer : IVexNormalizer
 {
+    private readonly IGuidProvider _guidProvider;
+
+    public CycloneDxVexNormalizer(IGuidProvider? guidProvider = null)
+    {
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
+    }
+
     public VexSourceFormat SourceFormat => VexSourceFormat.CycloneDxVex;
 
     public bool CanNormalize(string content)
@@ -65,7 +73,7 @@ public sealed class CycloneDxVexNormalizer : IVexNormalizer
             var documentId = ExtractDocumentId(root);
             if (string.IsNullOrWhiteSpace(documentId))
             {
-                documentId = $"cyclonedx:{Guid.NewGuid():N}";
+                documentId = $"cyclonedx:{_guidProvider.NewGuid():N}";
                 warnings.Add(new NormalizationWarning(
                     "WARN_CDX_001",
                     "Serial number not found; generated a random ID",
diff --git a/src/VexLens/StellaOps.VexLens/Normalization/OpenVexNormalizer.cs b/src/VexLens/StellaOps.VexLens/Normalization/OpenVexNormalizer.cs
index c0b18735d..f9d6c1c5b 100644
--- a/src/VexLens/StellaOps.VexLens/Normalization/OpenVexNormalizer.cs
+++ b/src/VexLens/StellaOps.VexLens/Normalization/OpenVexNormalizer.cs
@@ -2,6 +2,7 @@ using System.Diagnostics;
 using System.Security.Cryptography;
 using System.Text;
 using System.Text.Json;
+using StellaOps.Determinism;
 using StellaOps.VexLens.Models;
 
 namespace StellaOps.VexLens.Normalization;
@@ -11,6 +12,13 @@ namespace StellaOps.VexLens.Normalization;
 /// </summary>
 public sealed class OpenVexNormalizer : IVexNormalizer
 {
+    private readonly IGuidProvider _guidProvider;
+
+    public OpenVexNormalizer(IGuidProvider? guidProvider = null)
+    {
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
+    }
+
     public VexSourceFormat SourceFormat => VexSourceFormat.OpenVex;
 
     public bool CanNormalize(string content)
@@ -58,7 +66,7 @@ public sealed class OpenVexNormalizer : IVexNormalizer
             var documentId = ExtractDocumentId(root);
             if (string.IsNullOrWhiteSpace(documentId))
             {
-                documentId = $"openvex:{Guid.NewGuid():N}";
+                documentId = $"openvex:{_guidProvider.NewGuid():N}";
                 warnings.Add(new NormalizationWarning(
                     "WARN_OPENVEX_001",
                     "Document ID not found; generated a random ID",
@@ -207,7 +215,7 @@ public sealed class OpenVexNormalizer : IVexNormalizer
         return null;
     }
 
-    private static IReadOnlyList<NormalizedStatement> ExtractStatements(
+    private IReadOnlyList<NormalizedStatement> ExtractStatements(
         JsonElement root,
         List<NormalizationWarning> warnings,
         ref int skipped)
@@ -227,7 +235,7 @@ public sealed class OpenVexNormalizer : IVexNormalizer
 
         foreach (var stmt in statementsArray.EnumerateArray())
         {
-            var statement = ExtractStatement(stmt, index, warnings, ref skipped);
+            var statement = ExtractStatement(stmt, index, warnings, ref skipped, _guidProvider);
             if (statement != null)
             {
                 statements.Add(statement);
@@ -243,7 +251,8 @@ public sealed class OpenVexNormalizer : IVexNormalizer
         JsonElement stmt,
         int index,
         List<NormalizationWarning> warnings,
-        ref int skipped)
+        ref int skipped,
+        IGuidProvider? guidProvider = null)
     {
         // Extract vulnerability
         string? vulnerabilityId = null;
@@ -298,7 +307,7 @@ public sealed class OpenVexNormalizer : IVexNormalizer
         {
             foreach (var prod in productsArray.EnumerateArray())
             {
-                var product = ExtractProduct(prod);
+                var product = ExtractProduct(prod, guidProvider);
                 if (product != null)
                 {
                     products.Add(product);
@@ -378,7 +387,7 @@ public sealed class OpenVexNormalizer : IVexNormalizer
             LastSeen: timestamp);
     }
 
-    private static NormalizedProduct? ExtractProduct(JsonElement prod)
+    private static NormalizedProduct? ExtractProduct(JsonElement prod, IGuidProvider? guidProvider = null)
     {
         string? key = null;
         string? name = null;
@@ -423,8 +432,9 @@ public sealed class OpenVexNormalizer : IVexNormalizer
             return null;
         }
 
+        var fallbackGuid = guidProvider?.NewGuid() ?? Guid.NewGuid();
         return new NormalizedProduct(
-            Key: key ?? purl ?? cpe ?? $"unknown-{Guid.NewGuid():N}",
+            Key: key ?? purl ?? cpe ?? $"unknown-{fallbackGuid:N}",
             Name: name,
             Version: version,
             Purl: purl,
diff --git a/src/VexLens/StellaOps.VexLens/Orchestration/IConsensusJobService.cs b/src/VexLens/StellaOps.VexLens/Orchestration/IConsensusJobService.cs
index 3e23d9a45..27c7e0d8f 100644
--- a/src/VexLens/StellaOps.VexLens/Orchestration/IConsensusJobService.cs
+++ b/src/VexLens/StellaOps.VexLens/Orchestration/IConsensusJobService.cs
@@ -160,6 +160,7 @@ public sealed class ConsensusJobService : IConsensusJobService
     private readonly IVexConsensusEngine _consensusEngine;
     private readonly IConsensusProjectionStore _projectionStore;
     private readonly IConsensusExportService _exportService;
+    private readonly TimeProvider _timeProvider;
 
     private const string SchemaVersion = "1.0.0";
 
@@ -172,11 +173,13 @@ public sealed class ConsensusJobService : IConsensusJobService
     public ConsensusJobService(
         IVexConsensusEngine consensusEngine,
         IConsensusProjectionStore projectionStore,
-        IConsensusExportService exportService)
+        IConsensusExportService exportService,
+        TimeProvider? timeProvider = null)
     {
         _consensusEngine = consensusEngine;
         _projectionStore = projectionStore;
         _exportService = exportService;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public ConsensusJobRequest CreateComputeJob(
@@ -299,7 +302,7 @@ public sealed class ConsensusJobService : IConsensusJobService
             JobType: ConsensusJobTypes.SnapshotCreate,
             TenantId: request.TenantId,
             Priority: ConsensusJobTypes.GetDefaultPriority(ConsensusJobTypes.SnapshotCreate),
-            IdempotencyKey: $"snapshot:{requestHash}:{DateTimeOffset.UtcNow:yyyyMMddHHmm}",
+            IdempotencyKey: $"snapshot:{requestHash}:{_timeProvider.GetUtcNow():yyyyMMddHHmm}",
             Payload: JsonSerializer.Serialize(payload, JsonOptions));
     }
 
@@ -307,7 +310,7 @@ public sealed class ConsensusJobService : IConsensusJobService
         ConsensusJobRequest request,
         CancellationToken cancellationToken = default)
     {
-        var startTime = DateTimeOffset.UtcNow;
+        var startTime = _timeProvider.GetUtcNow();
 
         try
         {
@@ -350,7 +353,7 @@ public sealed class ConsensusJobService : IConsensusJobService
         ConsensusJobRequest request,
         CancellationToken cancellationToken)
     {
-        var startTime = DateTimeOffset.UtcNow;
+        var startTime = _timeProvider.GetUtcNow();
         var payload = JsonSerializer.Deserialize<ComputePayload>(request.Payload, JsonOptions)
             ?? throw new InvalidOperationException("Invalid compute payload");
 
@@ -363,7 +366,7 @@ public sealed class ConsensusJobService : IConsensusJobService
             JobType: request.JobType,
             ItemsProcessed: 1,
             ItemsFailed: 0,
-            Duration: DateTimeOffset.UtcNow - startTime,
+            Duration: _timeProvider.GetUtcNow() - startTime,
             ResultPayload: JsonSerializer.Serialize(new
             {
                 vulnerabilityId = payload.VulnerabilityId,
@@ -377,7 +380,7 @@ public sealed class ConsensusJobService : IConsensusJobService
         ConsensusJobRequest request,
         CancellationToken cancellationToken)
     {
-        var startTime = DateTimeOffset.UtcNow;
+        var startTime = _timeProvider.GetUtcNow();
         var payload = JsonSerializer.Deserialize<BatchComputePayload>(request.Payload, JsonOptions)
             ?? throw new InvalidOperationException("Invalid batch compute payload");
 
@@ -389,7 +392,7 @@ public sealed class ConsensusJobService : IConsensusJobService
             JobType: request.JobType,
             ItemsProcessed: itemCount,
             ItemsFailed: 0,
-            Duration: DateTimeOffset.UtcNow - startTime,
+            Duration: _timeProvider.GetUtcNow() - startTime,
             ResultPayload: JsonSerializer.Serialize(new { processedCount = itemCount }, JsonOptions),
             ErrorMessage: null);
     }
@@ -398,7 +401,7 @@ public sealed class ConsensusJobService : IConsensusJobService
         ConsensusJobRequest request,
         CancellationToken cancellationToken)
     {
-        var startTime = DateTimeOffset.UtcNow;
+        var startTime = _timeProvider.GetUtcNow();
 
         // Create snapshot using export service
         var snapshotRequest = ConsensusExportExtensions.FullExportRequest(request.TenantId);
@@ -409,7 +412,7 @@ public sealed class ConsensusJobService : IConsensusJobService
             JobType: request.JobType,
             ItemsProcessed: snapshot.Projections.Count,
             ItemsFailed: 0,
-            Duration: DateTimeOffset.UtcNow - startTime,
+            Duration: _timeProvider.GetUtcNow() - startTime,
             ResultPayload: JsonSerializer.Serialize(new
             {
                 snapshotId = snapshot.SnapshotId,
@@ -419,14 +422,14 @@ public sealed class ConsensusJobService : IConsensusJobService
             ErrorMessage: null);
     }
 
-    private static ConsensusJobResult CreateFailedResult(string jobType, DateTimeOffset startTime, string error)
+    private ConsensusJobResult CreateFailedResult(string jobType, DateTimeOffset startTime, string error)
     {
         return new ConsensusJobResult(
             Success: false,
             JobType: jobType,
             ItemsProcessed: 0,
             ItemsFailed: 1,
-            Duration: DateTimeOffset.UtcNow - startTime,
+            Duration: _timeProvider.GetUtcNow() - startTime,
             ResultPayload: null,
             ErrorMessage: error);
     }
diff --git a/src/VexLens/StellaOps.VexLens/Orchestration/OrchestratorLedgerEventEmitter.cs b/src/VexLens/StellaOps.VexLens/Orchestration/OrchestratorLedgerEventEmitter.cs
index 835eb17c0..120e33931 100644
--- a/src/VexLens/StellaOps.VexLens/Orchestration/OrchestratorLedgerEventEmitter.cs
+++ b/src/VexLens/StellaOps.VexLens/Orchestration/OrchestratorLedgerEventEmitter.cs
@@ -1,4 +1,5 @@
 using System.Text.Json;
+using StellaOps.Determinism;
 using StellaOps.VexLens.Consensus;
 using StellaOps.VexLens.Models;
 using StellaOps.VexLens.Storage;
@@ -14,6 +15,8 @@ public sealed class OrchestratorLedgerEventEmitter : IConsensusEventEmitter
 {
     private readonly IOrchestratorLedgerClient? _ledgerClient;
     private readonly OrchestratorEventOptions _options;
+    private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
 
     private static readonly JsonSerializerOptions JsonOptions = new()
     {
@@ -23,10 +26,14 @@ public sealed class OrchestratorLedgerEventEmitter : IConsensusEventEmitter
 
     public OrchestratorLedgerEventEmitter(
         IOrchestratorLedgerClient? ledgerClient = null,
-        OrchestratorEventOptions? options = null)
+        OrchestratorEventOptions? options = null,
+        TimeProvider? timeProvider = null,
+        IGuidProvider? guidProvider = null)
     {
         _ledgerClient = ledgerClient;
         _options = options ?? OrchestratorEventOptions.Default;
+        _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? new SystemGuidProvider();
     }
 
     public async Task EmitConsensusComputedAsync(
@@ -144,11 +151,11 @@ public sealed class OrchestratorLedgerEventEmitter : IConsensusEventEmitter
         if (_ledgerClient == null) return;
 
         var alertEvent = new LedgerEvent(
-            EventId: $"alert-{Guid.NewGuid():N}",
+            EventId: $"alert-{_guidProvider.NewGuid():N}",
             EventType: ConsensusEventTypes.Alert,
             TenantId: @event.TenantId,
             CorrelationId: @event.EventId,
-            OccurredAt: DateTimeOffset.UtcNow,
+            OccurredAt: _timeProvider.GetUtcNow(),
             IdempotencyKey: $"alert-status-{@event.ProjectionId}-{@event.NewStatus}",
             Actor: new LedgerActor("system", "vexlens", "alert-engine"),
             Payload: JsonSerializer.Serialize(new
@@ -174,11 +181,11 @@ public sealed class OrchestratorLedgerEventEmitter : IConsensusEventEmitter
         if (_ledgerClient == null) return;
 
         var alertEvent = new LedgerEvent(
-            EventId: $"alert-{Guid.NewGuid():N}",
+            EventId: $"alert-{_guidProvider.NewGuid():N}",
             EventType: ConsensusEventTypes.Alert,
             TenantId: @event.TenantId,
             CorrelationId: @event.EventId,
-            OccurredAt: DateTimeOffset.UtcNow,
+            OccurredAt: _timeProvider.GetUtcNow(),
             IdempotencyKey: $"alert-conflict-{@event.ProjectionId}",
             Actor: new LedgerActor("system", "vexlens", "alert-engine"),
             Payload: JsonSerializer.Serialize(new
diff --git a/src/VexLens/StellaOps.VexLens/Proof/VexProofBuilder.cs b/src/VexLens/StellaOps.VexLens/Proof/VexProofBuilder.cs
index 55580a3f7..ec5b42582 100644
--- a/src/VexLens/StellaOps.VexLens/Proof/VexProofBuilder.cs
+++ b/src/VexLens/StellaOps.VexLens/Proof/VexProofBuilder.cs
@@ -1,6 +1,7 @@
 // Licensed under AGPL-3.0-or-later. Copyright (C) 2024-2026 StellaOps Contributors.
 
 using System.Collections.Immutable;
+using StellaOps.Determinism;
 using StellaOps.VexLens.Consensus;
 using StellaOps.VexLens.Models;
 
@@ -13,6 +14,7 @@ namespace StellaOps.VexLens.Proof;
 public sealed class VexProofBuilder
 {
     private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
     private readonly List<VexProofStatement> _statements = [];
     private readonly List<VexProofMergeStep> _mergeSteps = [];
     private readonly List<VexProofConflict> _conflicts = [];
@@ -48,11 +50,12 @@ public sealed class VexProofBuilder
     private decimal _conditionCoverage = 1.0m;
 
     /// <summary>
-    /// Creates a new VexProofBuilder with the specified time provider.
+    /// Creates a new VexProofBuilder with the specified time provider and GUID provider.
     /// </summary>
-    public VexProofBuilder(TimeProvider timeProvider)
+    public VexProofBuilder(TimeProvider timeProvider, IGuidProvider? guidProvider = null)
     {
         _timeProvider = timeProvider ?? throw new ArgumentNullException(nameof(timeProvider));
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
     }
 
     /// <summary>
@@ -533,10 +536,10 @@ public sealed class VexProofBuilder
         _ => ConfidenceTier.VeryLow
     };
 
-    private static string GenerateProofId(DateTimeOffset timestamp)
+    private string GenerateProofId(DateTimeOffset timestamp)
     {
         var timePart = timestamp.ToString("yyyy-MM-ddTHH:mm:ssZ", System.Globalization.CultureInfo.InvariantCulture);
-        var randomPart = Guid.NewGuid().ToString("N")[..8];
+        var randomPart = _guidProvider.NewGuid().ToString("N")[..8];
         return $"proof-{timePart}-{randomPart}";
     }
 }
diff --git a/src/VexLens/StellaOps.VexLens/StellaOps.VexLens.csproj b/src/VexLens/StellaOps.VexLens/StellaOps.VexLens.csproj
index ad459b71f..79a7fea1d 100644
--- a/src/VexLens/StellaOps.VexLens/StellaOps.VexLens.csproj
+++ b/src/VexLens/StellaOps.VexLens/StellaOps.VexLens.csproj
@@ -30,6 +30,8 @@
     <!-- NG-001: Noise-gating dependencies -->
     <ProjectReference Include="..\..\__Libraries\StellaOps.ReachGraph\StellaOps.ReachGraph.csproj" />
     <ProjectReference Include="..\..\Policy\StellaOps.Policy.Engine\StellaOps.Policy.Engine.csproj" />
+    <!-- DET-015: Determinism abstractions for TimeProvider and IGuidProvider -->
+    <ProjectReference Include="..\..\__Libraries\StellaOps.Determinism.Abstractions\StellaOps.Determinism.Abstractions.csproj" />
   </ItemGroup>
 
   <!-- Exclude legacy folders with external dependencies -->
diff --git a/src/VexLens/StellaOps.VexLens/Storage/InMemoryConsensusProjectionStore.cs b/src/VexLens/StellaOps.VexLens/Storage/InMemoryConsensusProjectionStore.cs
index 2c403c3c5..1cd11a39c 100644
--- a/src/VexLens/StellaOps.VexLens/Storage/InMemoryConsensusProjectionStore.cs
+++ b/src/VexLens/StellaOps.VexLens/Storage/InMemoryConsensusProjectionStore.cs
@@ -1,4 +1,5 @@
 using System.Collections.Concurrent;
+using StellaOps.Determinism;
 using StellaOps.VexLens.Consensus;
 using StellaOps.VexLens.Models;
 using StellaOps.VexLens.Services;
@@ -16,13 +17,19 @@ public sealed class InMemoryConsensusProjectionStore : IConsensusProjectionStore
     private readonly IConsensusEventEmitter? _eventEmitter;
     // LIN-BE-009: Delta service for computing VEX deltas on status change
     private readonly IVexDeltaComputeService? _deltaComputeService;
+    private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
 
     public InMemoryConsensusProjectionStore(
         IConsensusEventEmitter? eventEmitter = null,
-        IVexDeltaComputeService? deltaComputeService = null)
+        IVexDeltaComputeService? deltaComputeService = null,
+        TimeProvider? timeProvider = null,
+        IGuidProvider? guidProvider = null)
     {
         _eventEmitter = eventEmitter;
         _deltaComputeService = deltaComputeService;
+        _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? SystemGuidProvider.Instance;
     }
 
     public async Task<ConsensusProjection> StoreAsync(
@@ -31,7 +38,7 @@ public sealed class InMemoryConsensusProjectionStore : IConsensusProjectionStore
         CancellationToken cancellationToken = default)
     {
         var key = GetKey(result.VulnerabilityId, result.ProductKey, options.TenantId);
-        var now = DateTimeOffset.UtcNow;
+        var now = _timeProvider.GetUtcNow();
 
         // Get previous projection for history tracking
         ConsensusProjection? previous = null;
@@ -52,7 +59,7 @@ public sealed class InMemoryConsensusProjectionStore : IConsensusProjectionStore
         }
 
         var projection = new ConsensusProjection(
-            ProjectionId: $"proj-{Guid.NewGuid():N}",
+            ProjectionId: $"proj-{_guidProvider.NewGuid():N}",
             VulnerabilityId: result.VulnerabilityId,
             ProductKey: result.ProductKey,
             TenantId: options.TenantId,
@@ -283,12 +290,12 @@ public sealed class InMemoryConsensusProjectionStore : IConsensusProjectionStore
     {
         if (_eventEmitter == null) return;
 
-        var now = DateTimeOffset.UtcNow;
+        var now = _timeProvider.GetUtcNow();
 
         // Always emit computed event
         await _eventEmitter.EmitConsensusComputedAsync(
             new ConsensusComputedEvent(
-                EventId: $"evt-{Guid.NewGuid():N}",
+                EventId: $"evt-{_guidProvider.NewGuid():N}",
                 ProjectionId: projection.ProjectionId,
                 VulnerabilityId: projection.VulnerabilityId,
                 ProductKey: projection.ProductKey,
@@ -307,7 +314,7 @@ public sealed class InMemoryConsensusProjectionStore : IConsensusProjectionStore
         {
             await _eventEmitter.EmitStatusChangedAsync(
                 new ConsensusStatusChangedEvent(
-                    EventId: $"evt-{Guid.NewGuid():N}",
+                    EventId: $"evt-{_guidProvider.NewGuid():N}",
                     ProjectionId: projection.ProjectionId,
                     VulnerabilityId: projection.VulnerabilityId,
                     ProductKey: projection.ProductKey,
@@ -325,7 +332,7 @@ public sealed class InMemoryConsensusProjectionStore : IConsensusProjectionStore
                 await _deltaComputeService.ComputeAndStoreAsync(
                     new VexStatusChangeContext
                     {
-                        ProjectionId = Guid.TryParse(projection.ProjectionId, out var pid) ? pid : Guid.NewGuid(),
+                        ProjectionId = Guid.TryParse(projection.ProjectionId, out var pid) ? pid : _guidProvider.NewGuid(),
                         VulnerabilityId = projection.VulnerabilityId,
                         ProductKey = projection.ProductKey,
                         ArtifactDigest = projection.ProductKey, // Use ProductKey as artifact identifier
@@ -355,7 +362,7 @@ public sealed class InMemoryConsensusProjectionStore : IConsensusProjectionStore
 
             await _eventEmitter.EmitConflictDetectedAsync(
                 new ConsensusConflictDetectedEvent(
-                    EventId: $"evt-{Guid.NewGuid():N}",
+                    EventId: $"evt-{_guidProvider.NewGuid():N}",
                     ProjectionId: projection.ProjectionId,
                     VulnerabilityId: projection.VulnerabilityId,
                     ProductKey: projection.ProductKey,
diff --git a/src/VexLens/StellaOps.VexLens/Storage/PostgresConsensusProjectionStoreProxy.cs b/src/VexLens/StellaOps.VexLens/Storage/PostgresConsensusProjectionStoreProxy.cs
index a33e478af..affd6ab63 100644
--- a/src/VexLens/StellaOps.VexLens/Storage/PostgresConsensusProjectionStoreProxy.cs
+++ b/src/VexLens/StellaOps.VexLens/Storage/PostgresConsensusProjectionStoreProxy.cs
@@ -4,6 +4,7 @@
 using System.Diagnostics;
 using Microsoft.Extensions.Logging;
 using Npgsql;
+using StellaOps.Determinism;
 using StellaOps.VexLens.Consensus;
 using StellaOps.VexLens.Models;
 using StellaOps.VexLens.Options;
@@ -28,19 +29,22 @@ public sealed class PostgresConsensusProjectionStoreProxy : IConsensusProjection
     private readonly ILogger<PostgresConsensusProjectionStoreProxy> _logger;
     private readonly VexLensStorageOptions _options;
     private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
 
     public PostgresConsensusProjectionStoreProxy(
         NpgsqlDataSource dataSource,
         ILogger<PostgresConsensusProjectionStoreProxy> logger,
         IConsensusEventEmitter? eventEmitter = null,
         VexLensStorageOptions? options = null,
-        TimeProvider? timeProvider = null)
+        TimeProvider? timeProvider = null,
+        IGuidProvider? guidProvider = null)
     {
         _dataSource = dataSource ?? throw new ArgumentNullException(nameof(dataSource));
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
         _eventEmitter = eventEmitter;
         _options = options ?? new VexLensStorageOptions();
         _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? new SystemGuidProvider();
     }
 
     private const string Schema = "vexlens";
@@ -108,7 +112,7 @@ public sealed class PostgresConsensusProjectionStoreProxy : IConsensusProjection
         activity?.SetTag("vulnerabilityId", result.VulnerabilityId);
         activity?.SetTag("productKey", result.ProductKey);
 
-        var projectionId = Guid.NewGuid();
+        var projectionId = _guidProvider.NewGuid();
         var now = _timeProvider.GetUtcNow();
 
         // Check for previous projection to track history
@@ -517,7 +521,7 @@ public sealed class PostgresConsensusProjectionStoreProxy : IConsensusProjection
 
         var now = _timeProvider.GetUtcNow();
         var computedEvent = new ConsensusComputedEvent(
-            EventId: $"evt-{Guid.NewGuid():N}",
+            EventId: $"evt-{_guidProvider.NewGuid():N}",
             ProjectionId: projection.ProjectionId,
             VulnerabilityId: projection.VulnerabilityId,
             ProductKey: projection.ProductKey,
@@ -535,7 +539,7 @@ public sealed class PostgresConsensusProjectionStoreProxy : IConsensusProjection
         if (projection.StatusChanged && previous is not null)
         {
             var changedEvent = new ConsensusStatusChangedEvent(
-                EventId: $"evt-{Guid.NewGuid():N}",
+                EventId: $"evt-{_guidProvider.NewGuid():N}",
                 ProjectionId: projection.ProjectionId,
                 VulnerabilityId: projection.VulnerabilityId,
                 ProductKey: projection.ProductKey,
diff --git a/src/VexLens/StellaOps.VexLens/Trust/SourceTrust/ISourceTrustScoreCalculator.cs b/src/VexLens/StellaOps.VexLens/Trust/SourceTrust/ISourceTrustScoreCalculator.cs
index 288e470b6..e03ac87ab 100644
--- a/src/VexLens/StellaOps.VexLens/Trust/SourceTrust/ISourceTrustScoreCalculator.cs
+++ b/src/VexLens/StellaOps.VexLens/Trust/SourceTrust/ISourceTrustScoreCalculator.cs
@@ -65,9 +65,9 @@ public sealed record SourceTrustScoreRequest
     public required SourceVerificationSummary VerificationSummary { get; init; }
 
     /// <summary>
-    /// Time at which to evaluate the score.
+    /// Time at which to evaluate the score. Required for determinism.
     /// </summary>
-    public DateTimeOffset EvaluationTime { get; init; } = DateTimeOffset.UtcNow;
+    public required DateTimeOffset EvaluationTime { get; init; }
 
     /// <summary>
     /// Previous score for trend calculation.
diff --git a/src/VexLens/StellaOps.VexLens/Trust/SourceTrust/InMemorySourceTrustScoreCache.cs b/src/VexLens/StellaOps.VexLens/Trust/SourceTrust/InMemorySourceTrustScoreCache.cs
index f1e064f86..50ef0b2f7 100644
--- a/src/VexLens/StellaOps.VexLens/Trust/SourceTrust/InMemorySourceTrustScoreCache.cs
+++ b/src/VexLens/StellaOps.VexLens/Trust/SourceTrust/InMemorySourceTrustScoreCache.cs
@@ -9,16 +9,18 @@ public sealed class InMemorySourceTrustScoreCache : ISourceTrustScoreCache
 {
     private readonly ConcurrentDictionary<string, CacheEntry> _cache = new();
     private readonly Timer _cleanupTimer;
+    private readonly TimeProvider _timeProvider;
 
-    public InMemorySourceTrustScoreCache()
+    public InMemorySourceTrustScoreCache(TimeProvider? timeProvider = null)
     {
+        _timeProvider = timeProvider ?? TimeProvider.System;
         // Clean up expired entries every 5 minutes
         _cleanupTimer = new Timer(CleanupExpiredEntries, null, TimeSpan.FromMinutes(5), TimeSpan.FromMinutes(5));
     }
 
     public Task<VexSourceTrustScore?> GetAsync(string sourceId, CancellationToken cancellationToken = default)
     {
-        if (_cache.TryGetValue(sourceId, out var entry) && entry.ExpiresAt > DateTimeOffset.UtcNow)
+        if (_cache.TryGetValue(sourceId, out var entry) && entry.ExpiresAt > _timeProvider.GetUtcNow())
         {
             return Task.FromResult<VexSourceTrustScore?>(entry.Score);
         }
@@ -28,7 +30,7 @@ public sealed class InMemorySourceTrustScoreCache : ISourceTrustScoreCache
 
     public Task SetAsync(string sourceId, VexSourceTrustScore score, TimeSpan duration, CancellationToken cancellationToken = default)
     {
-        var entry = new CacheEntry(score, DateTimeOffset.UtcNow + duration);
+        var entry = new CacheEntry(score, _timeProvider.GetUtcNow() + duration);
         _cache[sourceId] = entry;
         return Task.CompletedTask;
     }
@@ -41,7 +43,7 @@ public sealed class InMemorySourceTrustScoreCache : ISourceTrustScoreCache
 
     private void CleanupExpiredEntries(object? state)
     {
-        var now = DateTimeOffset.UtcNow;
+        var now = _timeProvider.GetUtcNow();
         var expiredKeys = _cache
             .Where(kvp => kvp.Value.ExpiresAt <= now)
             .Select(kvp => kvp.Key)
diff --git a/src/VexLens/StellaOps.VexLens/Trust/SourceTrust/ProvenanceChainValidator.cs b/src/VexLens/StellaOps.VexLens/Trust/SourceTrust/ProvenanceChainValidator.cs
index a9a1db66b..cd3ded514 100644
--- a/src/VexLens/StellaOps.VexLens/Trust/SourceTrust/ProvenanceChainValidator.cs
+++ b/src/VexLens/StellaOps.VexLens/Trust/SourceTrust/ProvenanceChainValidator.cs
@@ -11,13 +11,16 @@ public sealed class ProvenanceChainValidator : IProvenanceChainValidator
 {
     private readonly ILogger<ProvenanceChainValidator> _logger;
     private readonly IIssuerDirectory _issuerDirectory;
+    private readonly TimeProvider _timeProvider;
 
     public ProvenanceChainValidator(
         ILogger<ProvenanceChainValidator> logger,
-        IIssuerDirectory issuerDirectory)
+        IIssuerDirectory issuerDirectory,
+        TimeProvider? timeProvider = null)
     {
         _logger = logger;
         _issuerDirectory = issuerDirectory;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public async Task<ProvenanceValidationResult> ValidateAsync(
@@ -44,7 +47,7 @@ public sealed class ProvenanceChainValidator : IProvenanceChainValidator
         // Validate chain age
         if (options.MaxChainAge.HasValue)
         {
-            var chainAge = DateTimeOffset.UtcNow - chain.Origin.Timestamp;
+            var chainAge = _timeProvider.GetUtcNow() - chain.Origin.Timestamp;
             if (chainAge > options.MaxChainAge.Value)
             {
                 issues.Add(new ProvenanceIssue
diff --git a/src/VexLens/StellaOps.VexLens/Verification/InMemoryIssuerDirectory.cs b/src/VexLens/StellaOps.VexLens/Verification/InMemoryIssuerDirectory.cs
index 4d62f277d..429d60a70 100644
--- a/src/VexLens/StellaOps.VexLens/Verification/InMemoryIssuerDirectory.cs
+++ b/src/VexLens/StellaOps.VexLens/Verification/InMemoryIssuerDirectory.cs
@@ -11,6 +11,12 @@ public sealed class InMemoryIssuerDirectory : IIssuerDirectory
 {
     private readonly ConcurrentDictionary<string, IssuerRecord> _issuers = new(StringComparer.OrdinalIgnoreCase);
     private readonly ConcurrentDictionary<string, string> _fingerprintToIssuer = new(StringComparer.OrdinalIgnoreCase);
+    private readonly TimeProvider _timeProvider;
+
+    public InMemoryIssuerDirectory(TimeProvider? timeProvider = null)
+    {
+        _timeProvider = timeProvider ?? TimeProvider.System;
+    }
 
     public Task<IssuerRecord?> GetIssuerAsync(
         string issuerId,
@@ -86,7 +92,7 @@ public sealed class InMemoryIssuerDirectory : IIssuerDirectory
         IssuerRegistration registration,
         CancellationToken cancellationToken = default)
     {
-        var now = DateTimeOffset.UtcNow;
+        var now = _timeProvider.GetUtcNow();
         var keyRecords = new List<KeyFingerprintRecord>();
 
         if (registration.InitialKeys != null)
@@ -135,7 +141,7 @@ public sealed class InMemoryIssuerDirectory : IIssuerDirectory
             return Task.FromResult(false);
         }
 
-        var now = DateTimeOffset.UtcNow;
+        var now = _timeProvider.GetUtcNow();
         var updated = current with
         {
             Status = IssuerStatus.Revoked,
@@ -165,7 +171,7 @@ public sealed class InMemoryIssuerDirectory : IIssuerDirectory
             throw new InvalidOperationException($"Issuer '{issuerId}' not found");
         }
 
-        var now = DateTimeOffset.UtcNow;
+        var now = _timeProvider.GetUtcNow();
         var newKey = new KeyFingerprintRecord(
             Fingerprint: keyRegistration.Fingerprint,
             KeyType: keyRegistration.KeyType,
@@ -209,7 +215,7 @@ public sealed class InMemoryIssuerDirectory : IIssuerDirectory
             return Task.FromResult(false);
         }
 
-        var now = DateTimeOffset.UtcNow;
+        var now = _timeProvider.GetUtcNow();
         var revokedKey = keyIndex.k with
         {
             Status = KeyFingerprintStatus.Revoked,
@@ -284,7 +290,7 @@ public sealed class InMemoryIssuerDirectory : IIssuerDirectory
                 keyStatus = KeyTrustStatus.Revoked;
                 warnings.Add($"Key was revoked: {key.RevocationReason}");
             }
-            else if (key.ExpiresAt.HasValue && key.ExpiresAt.Value < DateTimeOffset.UtcNow)
+            else if (key.ExpiresAt.HasValue && key.ExpiresAt.Value < _timeProvider.GetUtcNow())
             {
                 keyStatus = KeyTrustStatus.Expired;
                 warnings.Add($"Key expired on {key.ExpiresAt.Value:O}");
diff --git a/src/Zastava/StellaOps.Zastava.Agent/Backend/RuntimeEventsClient.cs b/src/Zastava/StellaOps.Zastava.Agent/Backend/RuntimeEventsClient.cs
index 289cd09a7..8b2c0a391 100644
--- a/src/Zastava/StellaOps.Zastava.Agent/Backend/RuntimeEventsClient.cs
+++ b/src/Zastava/StellaOps.Zastava.Agent/Backend/RuntimeEventsClient.cs
@@ -2,6 +2,7 @@ using System.Net.Http.Json;
 using System.Text.Json;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
+using StellaOps.Determinism;
 using StellaOps.Zastava.Agent.Configuration;
 using StellaOps.Zastava.Core.Contracts;
 
@@ -34,15 +35,18 @@ internal sealed class RuntimeEventsClient : IRuntimeEventsClient
     private readonly HttpClient _httpClient;
     private readonly IOptionsMonitor<ZastavaAgentOptions> _options;
     private readonly ILogger<RuntimeEventsClient> _logger;
+    private readonly IGuidProvider _guidProvider;
 
     public RuntimeEventsClient(
         HttpClient httpClient,
         IOptionsMonitor<ZastavaAgentOptions> options,
-        ILogger<RuntimeEventsClient> logger)
+        ILogger<RuntimeEventsClient> logger,
+        IGuidProvider? guidProvider = null)
     {
         _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
         _options = options ?? throw new ArgumentNullException(nameof(options));
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        _guidProvider = guidProvider ?? new SystemGuidProvider();
     }
 
     public async Task<RuntimeEventsSubmitResult> SubmitAsync(
@@ -63,7 +67,7 @@ internal sealed class RuntimeEventsClient : IRuntimeEventsClient
         {
             var request = new RuntimeEventsSubmitRequest
             {
-                BatchId = Guid.NewGuid().ToString("N"),
+                BatchId = _guidProvider.NewGuid().ToString("N"),
                 Events = envelopes.ToArray()
             };
 
diff --git a/src/Zastava/StellaOps.Zastava.Agent/StellaOps.Zastava.Agent.csproj b/src/Zastava/StellaOps.Zastava.Agent/StellaOps.Zastava.Agent.csproj
index eb52eb4da..ec266735f 100644
--- a/src/Zastava/StellaOps.Zastava.Agent/StellaOps.Zastava.Agent.csproj
+++ b/src/Zastava/StellaOps.Zastava.Agent/StellaOps.Zastava.Agent.csproj
@@ -21,5 +21,6 @@
     <ProjectReference Include="../../Scanner/__Libraries/StellaOps.Scanner.Surface.Env/StellaOps.Scanner.Surface.Env.csproj" />
     <ProjectReference Include="../../Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/StellaOps.Scanner.Surface.Secrets.csproj" />
     <ProjectReference Include="../../__Libraries/StellaOps.Cryptography.DependencyInjection/StellaOps.Cryptography.DependencyInjection.csproj" />
+    <ProjectReference Include="../../__Libraries/StellaOps.Determinism.Abstractions/StellaOps.Determinism.Abstractions.csproj" />
   </ItemGroup>
 </Project>
diff --git a/src/Zastava/StellaOps.Zastava.Agent/Worker/HealthCheckHostedService.cs b/src/Zastava/StellaOps.Zastava.Agent/Worker/HealthCheckHostedService.cs
index b6aca188d..b3c55a30c 100644
--- a/src/Zastava/StellaOps.Zastava.Agent/Worker/HealthCheckHostedService.cs
+++ b/src/Zastava/StellaOps.Zastava.Agent/Worker/HealthCheckHostedService.cs
@@ -4,6 +4,7 @@ using System.Text.Json;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
+using StellaOps.Determinism;
 using StellaOps.Zastava.Agent.Configuration;
 using StellaOps.Zastava.Agent.Docker;
 
@@ -22,16 +23,22 @@ internal sealed class HealthCheckHostedService : BackgroundService
     private readonly IDockerSocketClient _dockerClient;
     private readonly IOptionsMonitor<ZastavaAgentOptions> _options;
     private readonly ILogger<HealthCheckHostedService> _logger;
+    private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
     private HttpListener? _listener;
 
     public HealthCheckHostedService(
         IDockerSocketClient dockerClient,
         IOptionsMonitor<ZastavaAgentOptions> options,
-        ILogger<HealthCheckHostedService> logger)
+        ILogger<HealthCheckHostedService> logger,
+        TimeProvider? timeProvider = null,
+        IGuidProvider? guidProvider = null)
     {
         _dockerClient = dockerClient ?? throw new ArgumentNullException(nameof(dockerClient));
         _options = options ?? throw new ArgumentNullException(nameof(options));
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        _timeProvider = timeProvider ?? TimeProvider.System;
+        _guidProvider = guidProvider ?? new SystemGuidProvider();
     }
 
     protected override async Task ExecuteAsync(CancellationToken stoppingToken)
@@ -184,7 +191,7 @@ internal sealed class HealthCheckHostedService : BackgroundService
         {
             Status = overallHealthy ? "healthy" : "unhealthy",
             Checks = checks,
-            Timestamp = DateTimeOffset.UtcNow
+            Timestamp = _timeProvider.GetUtcNow()
         };
 
         return (overallHealthy ? 200 : 503, response);
@@ -203,7 +210,7 @@ internal sealed class HealthCheckHostedService : BackgroundService
                 {
                     Status = "ready",
                     Message = "Agent ready to process container events",
-                    Timestamp = DateTimeOffset.UtcNow
+                    Timestamp = _timeProvider.GetUtcNow()
                 });
             }
 
@@ -211,7 +218,7 @@ internal sealed class HealthCheckHostedService : BackgroundService
             {
                 Status = "not_ready",
                 Message = "Docker daemon not reachable",
-                Timestamp = DateTimeOffset.UtcNow
+                Timestamp = _timeProvider.GetUtcNow()
             });
         }
         catch (Exception ex)
@@ -220,16 +227,16 @@ internal sealed class HealthCheckHostedService : BackgroundService
             {
                 Status = "not_ready",
                 Message = $"Ready check failed: {ex.Message}",
-                Timestamp = DateTimeOffset.UtcNow
+                Timestamp = _timeProvider.GetUtcNow()
             });
         }
     }
 
-    private static bool IsDirectoryWritable(string path)
+    private bool IsDirectoryWritable(string path)
     {
         try
         {
-            var testFile = Path.Combine(path, $".healthcheck-{Guid.NewGuid():N}");
+            var testFile = Path.Combine(path, $".healthcheck-{_guidProvider.NewGuid():N}");
             File.WriteAllText(testFile, "test");
             File.Delete(testFile);
             return true;
diff --git a/src/Zastava/StellaOps.Zastava.Agent/Worker/RuntimeEventBuffer.cs b/src/Zastava/StellaOps.Zastava.Agent/Worker/RuntimeEventBuffer.cs
index e42ce3164..10f5c1f3b 100644
--- a/src/Zastava/StellaOps.Zastava.Agent/Worker/RuntimeEventBuffer.cs
+++ b/src/Zastava/StellaOps.Zastava.Agent/Worker/RuntimeEventBuffer.cs
@@ -3,6 +3,7 @@ using System.Runtime.CompilerServices;
 using System.Threading.Channels;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
+using StellaOps.Determinism;
 using StellaOps.Zastava.Agent.Configuration;
 using StellaOps.Zastava.Core.Contracts;
 using StellaOps.Zastava.Core.Serialization;
@@ -31,6 +32,7 @@ internal sealed class RuntimeEventBuffer : IRuntimeEventBuffer
     private readonly string _spoolPath;
     private readonly ILogger<RuntimeEventBuffer> _logger;
     private readonly TimeProvider _timeProvider;
+    private readonly IGuidProvider _guidProvider;
     private readonly long _maxDiskBytes;
     private readonly int _capacity;
 
@@ -39,11 +41,13 @@ internal sealed class RuntimeEventBuffer : IRuntimeEventBuffer
     public RuntimeEventBuffer(
         IOptions<ZastavaAgentOptions> agentOptions,
         TimeProvider timeProvider,
-        ILogger<RuntimeEventBuffer> logger)
+        ILogger<RuntimeEventBuffer> logger,
+        IGuidProvider? guidProvider = null)
     {
         ArgumentNullException.ThrowIfNull(agentOptions);
         _timeProvider = timeProvider ?? throw new ArgumentNullException(nameof(timeProvider));
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        _guidProvider = guidProvider ?? new SystemGuidProvider();
 
         var options = agentOptions.Value ?? throw new ArgumentNullException(nameof(agentOptions));
 
@@ -178,7 +182,7 @@ internal sealed class RuntimeEventBuffer : IRuntimeEventBuffer
     private async Task<string> PersistAsync(byte[] payload, CancellationToken cancellationToken)
     {
         var timestamp = _timeProvider.GetUtcNow().UtcTicks;
-        var fileName = $"{timestamp:D20}-{Guid.NewGuid():N}{FileExtension}";
+        var fileName = $"{timestamp:D20}-{_guidProvider.NewGuid():N}{FileExtension}";
         var filePath = Path.Combine(_spoolPath, fileName);
 
         Directory.CreateDirectory(_spoolPath);
diff --git a/src/Zastava/StellaOps.Zastava.Agent/Worker/RuntimeEventDispatchService.cs b/src/Zastava/StellaOps.Zastava.Agent/Worker/RuntimeEventDispatchService.cs
index f25708aac..92583ed65 100644
--- a/src/Zastava/StellaOps.Zastava.Agent/Worker/RuntimeEventDispatchService.cs
+++ b/src/Zastava/StellaOps.Zastava.Agent/Worker/RuntimeEventDispatchService.cs
@@ -16,18 +16,21 @@ internal sealed class RuntimeEventDispatchService : BackgroundService
     private readonly IRuntimeEventsClient _eventsClient;
     private readonly IOptionsMonitor<ZastavaAgentOptions> _options;
     private readonly ILogger<RuntimeEventDispatchService> _logger;
+    private readonly TimeProvider _timeProvider;
     private readonly Random _jitterRandom = new();
 
     public RuntimeEventDispatchService(
         IRuntimeEventBuffer eventBuffer,
         IRuntimeEventsClient eventsClient,
         IOptionsMonitor<ZastavaAgentOptions> options,
-        ILogger<RuntimeEventDispatchService> logger)
+        ILogger<RuntimeEventDispatchService> logger,
+        TimeProvider? timeProvider = null)
     {
         _eventBuffer = eventBuffer ?? throw new ArgumentNullException(nameof(eventBuffer));
         _eventsClient = eventsClient ?? throw new ArgumentNullException(nameof(eventsClient));
         _options = options ?? throw new ArgumentNullException(nameof(options));
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     protected override async Task ExecuteAsync(CancellationToken stoppingToken)
@@ -43,7 +46,7 @@ internal sealed class RuntimeEventDispatchService : BackgroundService
             flushInterval);
 
         var batch = new List<RuntimeEventBufferItem>(batchSize);
-        var lastFlush = DateTimeOffset.UtcNow;
+        var lastFlush = _timeProvider.GetUtcNow();
         var failureCount = 0;
 
         try
@@ -53,7 +56,7 @@ internal sealed class RuntimeEventDispatchService : BackgroundService
                 batch.Add(item);
 
                 var shouldFlush = batch.Count >= batchSize ||
-                                  (batch.Count > 0 && DateTimeOffset.UtcNow - lastFlush >= flushInterval);
+                                  (batch.Count > 0 && _timeProvider.GetUtcNow() - lastFlush >= flushInterval);
 
                 if (shouldFlush)
                 {
@@ -68,7 +71,7 @@ internal sealed class RuntimeEventDispatchService : BackgroundService
                     }
 
                     batch.Clear();
-                    lastFlush = DateTimeOffset.UtcNow;
+                    lastFlush = _timeProvider.GetUtcNow();
                 }
             }
         }
diff --git a/src/Zastava/StellaOps.Zastava.Observer/Probes/EbpfProbeManager.cs b/src/Zastava/StellaOps.Zastava.Observer/Probes/EbpfProbeManager.cs
index 91f1d2904..2a3695373 100644
--- a/src/Zastava/StellaOps.Zastava.Observer/Probes/EbpfProbeManager.cs
+++ b/src/Zastava/StellaOps.Zastava.Observer/Probes/EbpfProbeManager.cs
@@ -23,6 +23,7 @@ public sealed class EbpfProbeManager : IProbeManager, IAsyncDisposable
     private readonly IRuntimeSignalCollector _signalCollector;
     private readonly ISignalPublisher _signalPublisher;
     private readonly EbpfProbeManagerOptions _options;
+    private readonly TimeProvider _timeProvider;
     private readonly ConcurrentDictionary<string, SignalCollectionHandle> _activeHandles;
     private bool _disposed;
 
@@ -30,12 +31,14 @@ public sealed class EbpfProbeManager : IProbeManager, IAsyncDisposable
         ILogger<EbpfProbeManager> logger,
         IRuntimeSignalCollector signalCollector,
         ISignalPublisher signalPublisher,
-        IOptions<EbpfProbeManagerOptions> options)
+        IOptions<EbpfProbeManagerOptions> options,
+        TimeProvider? timeProvider = null)
     {
         _logger = logger;
         _signalCollector = signalCollector;
         _signalPublisher = signalPublisher;
         _options = options.Value;
+        _timeProvider = timeProvider ?? TimeProvider.System;
         _activeHandles = new ConcurrentDictionary<string, SignalCollectionHandle>();
     }
 
@@ -277,7 +280,7 @@ public sealed class EbpfProbeManager : IProbeManager, IAsyncDisposable
             Namespace = evt.Labels.GetValueOrDefault("io.kubernetes.pod.namespace"),
             PodName = evt.Labels.GetValueOrDefault("io.kubernetes.pod.name"),
             Summary = summary,
-            CollectedAt = DateTimeOffset.UtcNow,
+            CollectedAt = _timeProvider.GetUtcNow(),
         };
 
         await _signalPublisher.PublishAsync(message, ct);
diff --git a/src/Zastava/StellaOps.Zastava.Observer/Runtime/ProcSnapshot/ProcSnapshotCollector.cs b/src/Zastava/StellaOps.Zastava.Observer/Runtime/ProcSnapshot/ProcSnapshotCollector.cs
index 7e357c02e..e48be4ba3 100644
--- a/src/Zastava/StellaOps.Zastava.Observer/Runtime/ProcSnapshot/ProcSnapshotCollector.cs
+++ b/src/Zastava/StellaOps.Zastava.Observer/Runtime/ProcSnapshot/ProcSnapshotCollector.cs
@@ -30,10 +30,12 @@ internal sealed class ProcSnapshotCollector : IProcSnapshotCollector
     private readonly DotNetAssemblyCollector _dotnetCollector;
     private readonly PhpAutoloadCollector _phpCollector;
     private readonly ILogger<ProcSnapshotCollector> _logger;
+    private readonly TimeProvider _timeProvider;
     private readonly string _procRoot;
 
     public ProcSnapshotCollector(
         IOptions<ZastavaObserverOptions> options,
+        TimeProvider? timeProvider,
         ILoggerFactory loggerFactory)
     {
         ArgumentNullException.ThrowIfNull(options);
@@ -41,6 +43,7 @@ internal sealed class ProcSnapshotCollector : IProcSnapshotCollector
 
         _procRoot = options.Value.ProcRootPath;
         _logger = loggerFactory.CreateLogger<ProcSnapshotCollector>();
+        _timeProvider = timeProvider ?? TimeProvider.System;
 
         _javaCollector = new JavaClasspathCollector(
             _procRoot,
@@ -82,7 +85,7 @@ internal sealed class ProcSnapshotCollector : IProcSnapshotCollector
 
         var document = new ProcSnapshotDocument
         {
-            Id = $"{tenant}:{imageDigest}:{pid}:{DateTimeOffset.UtcNow.ToUnixTimeMilliseconds()}",
+            Id = $"{tenant}:{imageDigest}:{pid}:{_timeProvider.GetUtcNow().ToUnixTimeMilliseconds()}",
             Tenant = tenant,
             ImageDigest = imageDigest,
             ContainerId = container.Id,
@@ -91,7 +94,7 @@ internal sealed class ProcSnapshotCollector : IProcSnapshotCollector
             Classpath = snapshot.Classpath,
             LoadedAssemblies = snapshot.LoadedAssemblies,
             AutoloadPaths = snapshot.AutoloadPaths,
-            CapturedAt = DateTimeOffset.UtcNow
+            CapturedAt = _timeProvider.GetUtcNow()
         };
 
         _logger.LogDebug(
diff --git a/src/Zastava/StellaOps.Zastava.Observer/Runtime/RuntimeEventBuffer.cs b/src/Zastava/StellaOps.Zastava.Observer/Runtime/RuntimeEventBuffer.cs
index d53897d59..c26e416c8 100644
--- a/src/Zastava/StellaOps.Zastava.Observer/Runtime/RuntimeEventBuffer.cs
+++ b/src/Zastava/StellaOps.Zastava.Observer/Runtime/RuntimeEventBuffer.cs
@@ -4,6 +4,7 @@ using System.Runtime.CompilerServices;
 using System.Threading.Channels;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
+using StellaOps.Determinism;
 using StellaOps.Zastava.Core.Contracts;
 using StellaOps.Zastava.Core.Serialization;
 using StellaOps.Zastava.Observer.Configuration;
@@ -32,6 +33,7 @@ internal sealed class RuntimeEventBuffer : IRuntimeEventBuffer
     private readonly string spoolPath;
     private readonly ILogger<RuntimeEventBuffer> logger;
     private readonly TimeProvider timeProvider;
+    private readonly IGuidProvider guidProvider;
     private readonly long maxDiskBytes;
 
     private long currentBytes;
@@ -40,11 +42,13 @@ internal sealed class RuntimeEventBuffer : IRuntimeEventBuffer
     public RuntimeEventBuffer(
         IOptions<ZastavaObserverOptions> observerOptions,
         TimeProvider timeProvider,
-        ILogger<RuntimeEventBuffer> logger)
+        ILogger<RuntimeEventBuffer> logger,
+        IGuidProvider? guidProvider = null)
     {
         ArgumentNullException.ThrowIfNull(observerOptions);
         this.timeProvider = timeProvider ?? throw new ArgumentNullException(nameof(timeProvider));
         this.logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        this.guidProvider = guidProvider ?? SystemGuidProvider.Instance;
 
         var options = observerOptions.Value ?? throw new ArgumentNullException(nameof(observerOptions));
 
@@ -178,7 +182,7 @@ internal sealed class RuntimeEventBuffer : IRuntimeEventBuffer
     private async Task<string> PersistAsync(byte[] payload, CancellationToken cancellationToken)
     {
         var timestamp = timeProvider.GetUtcNow().UtcTicks;
-        var fileName = $"{timestamp:D20}-{Guid.NewGuid():N}{FileExtension}";
+        var fileName = $"{timestamp:D20}-{guidProvider.NewGuid():N}{FileExtension}";
         var filePath = Path.Combine(spoolPath, fileName);
 
         Directory.CreateDirectory(spoolPath);
diff --git a/src/Zastava/StellaOps.Zastava.Observer/StellaOps.Zastava.Observer.csproj b/src/Zastava/StellaOps.Zastava.Observer/StellaOps.Zastava.Observer.csproj
index 30704ba56..551afacc0 100644
--- a/src/Zastava/StellaOps.Zastava.Observer/StellaOps.Zastava.Observer.csproj
+++ b/src/Zastava/StellaOps.Zastava.Observer/StellaOps.Zastava.Observer.csproj
@@ -28,6 +28,7 @@
     <ProjectReference Include="../../Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/StellaOps.Scanner.Surface.Secrets.csproj" />
     <ProjectReference Include="../../Scanner/__Libraries/StellaOps.Scanner.Surface.Validation/StellaOps.Scanner.Surface.Validation.csproj" />
     <ProjectReference Include="../../__Libraries/StellaOps.Cryptography.DependencyInjection/StellaOps.Cryptography.DependencyInjection.csproj" />
+    <ProjectReference Include="../../__Libraries/StellaOps.Determinism.Abstractions/StellaOps.Determinism.Abstractions.csproj" />
   </ItemGroup>
   <ItemGroup>
     <Protobuf Include="Protos/runtime/v1/runtime.proto" GrpcServices="Client" />
diff --git a/src/Zastava/StellaOps.Zastava.Observer/Worker/RuntimeEventDispatchService.cs b/src/Zastava/StellaOps.Zastava.Observer/Worker/RuntimeEventDispatchService.cs
index 84e0751bd..0ef173847 100644
--- a/src/Zastava/StellaOps.Zastava.Observer/Worker/RuntimeEventDispatchService.cs
+++ b/src/Zastava/StellaOps.Zastava.Observer/Worker/RuntimeEventDispatchService.cs
@@ -3,6 +3,7 @@ using System.Net;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
+using StellaOps.Determinism;
 using StellaOps.Zastava.Core.Contracts;
 using StellaOps.Zastava.Observer.Backend;
 using StellaOps.Zastava.Observer.Configuration;
@@ -17,6 +18,7 @@ internal sealed class RuntimeEventDispatchService : BackgroundService
     private readonly IRuntimeFactsClient runtimeFactsClient;
     private readonly IOptionsMonitor<ZastavaObserverOptions> observerOptions;
     private readonly TimeProvider timeProvider;
+    private readonly IGuidProvider guidProvider;
     private readonly ILogger<RuntimeEventDispatchService> logger;
 
     public RuntimeEventDispatchService(
@@ -25,6 +27,7 @@ internal sealed class RuntimeEventDispatchService : BackgroundService
         IRuntimeFactsClient runtimeFactsClient,
         IOptionsMonitor<ZastavaObserverOptions> observerOptions,
         TimeProvider timeProvider,
+        IGuidProvider? guidProvider,
         ILogger<RuntimeEventDispatchService> logger)
     {
         this.buffer = buffer ?? throw new ArgumentNullException(nameof(buffer));
@@ -32,6 +35,7 @@ internal sealed class RuntimeEventDispatchService : BackgroundService
         this.runtimeFactsClient = runtimeFactsClient ?? throw new ArgumentNullException(nameof(runtimeFactsClient));
         this.observerOptions = observerOptions ?? throw new ArgumentNullException(nameof(observerOptions));
         this.timeProvider = timeProvider ?? throw new ArgumentNullException(nameof(timeProvider));
+        this.guidProvider = guidProvider ?? SystemGuidProvider.Instance;
         this.logger = logger ?? throw new ArgumentNullException(nameof(logger));
     }
 
@@ -127,7 +131,7 @@ internal sealed class RuntimeEventDispatchService : BackgroundService
 
             var request = new RuntimeEventsIngestRequest
             {
-                BatchId = $"obs-{timeProvider.GetUtcNow():yyyyMMddTHHmmssfff}-{Guid.NewGuid():N}",
+                BatchId = $"obs-{timeProvider.GetUtcNow():yyyyMMddTHHmmssfff}-{guidProvider.NewGuid():N}",
                 Events = envelopes
             };
 
diff --git a/src/Zastava/StellaOps.Zastava.Webhook/Certificates/WebhookCertificateHealthCheck.cs b/src/Zastava/StellaOps.Zastava.Webhook/Certificates/WebhookCertificateHealthCheck.cs
index 74dc92f80..1a431faa6 100644
--- a/src/Zastava/StellaOps.Zastava.Webhook/Certificates/WebhookCertificateHealthCheck.cs
+++ b/src/Zastava/StellaOps.Zastava.Webhook/Certificates/WebhookCertificateHealthCheck.cs
@@ -6,14 +6,17 @@ public sealed class WebhookCertificateHealthCheck : IHealthCheck
 {
     private readonly IWebhookCertificateProvider _certificateProvider;
     private readonly ILogger<WebhookCertificateHealthCheck> _logger;
+    private readonly TimeProvider _timeProvider;
     private readonly TimeSpan _expiryThreshold = TimeSpan.FromDays(7);
 
     public WebhookCertificateHealthCheck(
         IWebhookCertificateProvider certificateProvider,
-        ILogger<WebhookCertificateHealthCheck> logger)
+        ILogger<WebhookCertificateHealthCheck> logger,
+        TimeProvider? timeProvider = null)
     {
         _certificateProvider = certificateProvider;
         _logger = logger;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     public Task<HealthCheckResult> CheckHealthAsync(HealthCheckContext context, CancellationToken cancellationToken = default)
@@ -22,7 +25,7 @@ public sealed class WebhookCertificateHealthCheck : IHealthCheck
         {
             var certificate = _certificateProvider.GetCertificate();
             var expires = certificate.NotAfter.ToUniversalTime();
-            var remaining = expires - DateTimeOffset.UtcNow;
+            var remaining = expires - _timeProvider.GetUtcNow();
 
             if (remaining <= TimeSpan.Zero)
             {