NestJS pattern uses hash chains to build tamper-evident audit logs for compliance

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A software developer has detailed a cryptographic technique for creating tamper-proof audit logs using NestJS and PostgreSQL, addressing a common weakness in standard logging systems. The approach uses hash chaining, where each log entry stores a SHA-256 hash of its own payload, a reference to the previous entry's hash, and a cumulative chain hash. This structure means any attempt to modify, delete, reorder, or insert records breaks the chain and triggers verification failures, catching even attackers with direct SQL database access. The system supports per-tenant chains with monotonic sequence counters, making it suitable for compliance frameworks such as SOC 2, HIPAA, and GDPR Article 30. Full implementation code has been published in the open-source Sytadel Suite repository on GitHub.

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