# Verifiable Evidence for Every Release Decision

## Module
EvidenceLocker

## Status
IMPLEMENTED

## Description
Timestamped evidence with attestation assembly and export services supports verifiable, audit-grade release decision records.

## Implementation Details
- **Modules**: `src/EvidenceLocker/StellaOps.EvidenceLocker/StellaOps.EvidenceLocker.Infrastructure/`, `src/EvidenceLocker/__Libraries/StellaOps.EvidenceLocker.Timestamping/`
- **Key Classes**:
  - `EvidenceBundleBuilder` (`src/EvidenceLocker/StellaOps.EvidenceLocker/StellaOps.EvidenceLocker.Infrastructure/Builders/EvidenceBundleBuilder.cs`) - assembles verifiable evidence for release decisions
  - `EvidenceSignatureService` (`src/EvidenceLocker/StellaOps.EvidenceLocker/StellaOps.EvidenceLocker.Infrastructure/Signing/EvidenceSignatureService.cs`) - signs evidence with DSSE for verifiability
  - `RetimestampService` (`src/EvidenceLocker/__Libraries/StellaOps.EvidenceLocker.Timestamping/RetimestampService.cs`) - provides timestamps for evidence records
  - `EvidenceSnapshotService` (`src/EvidenceLocker/StellaOps.EvidenceLocker/StellaOps.EvidenceLocker.Infrastructure/Services/EvidenceSnapshotService.cs`) - captures point-in-time evidence snapshots
  - `EvidenceBundleRepository` (`src/EvidenceLocker/StellaOps.EvidenceLocker/StellaOps.EvidenceLocker.Infrastructure/Repositories/EvidenceBundleRepository.cs`) - persists verifiable evidence bundles
  - `TimestampEvidence` (`src/EvidenceLocker/__Libraries/StellaOps.EvidenceLocker.Timestamping/Models/TimestampEvidence.cs`) - timestamp evidence model for RFC 3161/Rekor timestamps
- **Interfaces**: `IEvidenceBundleBuilder`, `IEvidenceSignatureService`, `IRetimestampService`, `IEvidenceBundleRepository`
- **Source**: Feature matrix scan

## E2E Test Plan
- [ ] Record a release decision and verify `EvidenceBundleBuilder` creates a verifiable evidence bundle with DSSE signature
- [ ] Verify `EvidenceSignatureService` produces DSSE signatures that are independently verifiable
- [ ] Verify `RetimestampService` attaches RFC 3161 or Rekor timestamps to evidence records
- [ ] Verify `EvidenceSnapshotService` captures the complete decision context at the time of the decision
- [ ] Verify evidence bundles persisted via `EvidenceBundleRepository` maintain integrity over time (content hash matches)
- [ ] Verify end-to-end: create, sign, timestamp, store, retrieve, and independently verify an evidence bundle