Security: Implement Secure Audit Trail with Immutable Event Log

[Smartdevs17]

Context

Compliance requirements (SOC2, PCI-DSS) demand tamper-evident audit logs for all sensitive operations.

Current Limitation/Problem

Audit logs are stored in a regular database table that can be modified by database administrators or through SQL injection. There is no tamper evidence.

Expected Outcome

An immutable audit trail using a hash chain where each log entry contains the hash of the previous entry, with periodic hash anchors to a public blockchain.

Acceptance Criteria

• All sensitive operations logged: auth, payment, configuration changes, admin actions
• Each log entry contains: { id, timestamp, actor, action, resource, details, previousHash, hash }
• Hash chain: hash = SHA256(previousHash + timestamp + actor + action + resource + details)
• Periodic anchor: append latest hash to public blockchain (Ethereum or Stellar) as proof
• Verification tool: verify audit log integrity from genesis
• Query performance: index on timestamp, actor, action for search
• Log retention: hot (30 days in DB), warm (1 year in S3), cold (7 years in Glacier)
• Tamper detection alert when hash chain inconsistency found
• Export audit log for compliance review

Technical Scope

• backend/src/audit/ - audit service
• backend/src/audit/immutable-logger.ts - hash chain logger
• backend/src/audit/chain-verifier.ts - integrity verification
• backend/src/audit/anchor-service.ts - blockchain anchoring
• Prisma: AuditLog model (hash chain)
• S3 archiver for warm/cold storage
• Frontend: /admin/audit-log - audit log viewer with verification
• Edge cases: hash collision, blockchain anchor cost, concurrent log writes, log pruning

[Properprogress1]

@Properprogress1 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

can I work on this ?

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Properprogress1 to this issue.

[BigDella]

@BigDella has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

i will love to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @BigDella to this issue.

[drips-wave]

Congratulations, @BigDella! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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