# Enhanced Rekor Proof Persistence

## Module
Attestor

## Status
VERIFIED

## Description
Enhanced Rekor proof persistence storing checkpoint signatures, checkpoint notes, entry body hashes, and verification timestamps for complete offline verification without Rekor connectivity.

## Implementation Details
- **Rekor Entry Entity**: `src/Attestor/__Libraries/StellaOps.Attestor.Persistence/Entities/RekorEntryEntity.cs` -- database entity storing Rekor entries with inclusion proofs, checkpoint data, and verification timestamps.
- **DSSE Envelope Entity**: `Entities/DsseEnvelopeEntity.cs` -- persists signed DSSE envelopes associated with Rekor entries.
- **Spine Entity**: `Entities/SpineEntity.cs` -- persists proof spine data.
- **Trust Anchor Entity**: `Entities/TrustAnchorEntity.cs` -- stores trust anchor data for offline verification.
- **Proof Chain DB Context**: `ProofChainDbContext.cs` -- EF Core DbContext for proof chain persistence.
- **Repositories**: `Repositories/IProofChainRepository.cs` -- repository interface. `IVerdictLedgerRepository.cs` -- verdict ledger repository.
- **Trust Anchor Matcher**: `Services/TrustAnchorMatcher.cs` -- matches entries against persisted trust anchors.
- **Rekor Checkpoint Store**: `src/Attestor/StellaOps.Attestor/StellaOps.Attestor.Storage/Rekor/PostgresRekorCheckpointStore.cs` -- PostgreSQL checkpoint persistence.
- **Offline Receipt Verifier**: `StellaOps.Attestor.Core/Verification/RekorOfflineReceiptVerifier.cs` -- verifies receipts using persisted data.
- **Tests**: `__Tests/StellaOps.Attestor.Persistence.Tests/ProofChainDbContextTests.cs`, `TrustAnchorMatcherTests.cs`

## E2E Test Plan
- [ ] Persist a Rekor entry with inclusion proof and checkpoint via `RekorEntryEntity` and retrieve it, verifying all fields
- [ ] Persist a DSSE envelope via `DsseEnvelopeEntity` and verify association with its Rekor entry
- [ ] Store a trust anchor via `TrustAnchorEntity` and verify `TrustAnchorMatcher` can match entries against it
- [ ] Store checkpoint signatures via `PostgresRekorCheckpointStore` and retrieve them for offline verification
- [ ] Verify a Rekor receipt offline using `RekorOfflineReceiptVerifier` with only persisted data (no network)
- [ ] Persist a spine entity and verify it links to its constituent proof entries
- [ ] Verify `ProofChainDbContext` migrations create correct schema with all required tables and indexes

## Verification

| Check | Result |
|-------|--------|
| Tier 0 - Source Verification | PASS |
| Tier 1 - Build + Code Review | PASS |
| Tier 2 - Behavioral Verification | PASS |
| Verified Date | 2026-02-13 |
| Run ID | run-001 |