feat: public witness for audit log Merkle roots (#721) - #797
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Add day-scoped Merkle root computation over audit row_hashes, publish to a public witness (Stellar memo / mock) with bounded retry+backoff, and persist receipts. Witness downtime never breaks local integrity. Emits audit.witness.published on success.
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Overview
This PR publishes the Merkle root of each day's audit log to a public witness (Stellar memo / mock), persists the receipt, and retries with bounded backoff. Witness downtime never breaks local hash-chain integrity verification.
Related Issue
Closes #721
Changes
🔐 Public witness for audit Merkle roots
src/security/auditMerkle.ts— pure Merkle helpers (computeMerkleRoot,utcDayBounds).src/security/witnessClient.ts—MockWitnessClient+StellarMemoWitnessClient(injectable Horizon submitter; dry-run by default).src/security/auditWitnessPublisher.tspublishDayRoot()loads the day'srow_hashvalues, computes the Merkle root, publishes with exponential backoff, persists receipt.publishLatest()still publishes the chain head after a successful integrity check.audit.witness.publish_errors+ ALARM and are swallowed.src/security/auditIntegrityScheduler.ts— nightly job callspublishDayRoot()+publishLatest().docs/audit-merkle-public-witness.md.Receipts land in
audit_witness_receipts(migration 018).Verification Results
publishDayRoot()audit_witness_receiptsaudit.witness.publishedTimeline