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Engineer Builds Tamper-Evident Transaction System Without Blockchain

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Software engineer Viktor Khudiaiev has published a reference implementation demonstrating how database record integrity can be enforced without using a blockchain, with the article updated on September 20, 2026. The system uses standard PostgreSQL, three Java services, and simulated financial transfers to prevent unauthorized changes even by attackers with full database administrator privileges. By combining cryptographic authentication with a protected execution boundary, the design ensures that controlling the primary transaction database alone is insufficient to forge, modify, or replay financial operations. The architecture separates a primary attacker-controlled database from a protected audit database that holds authoritative execution state and independent evidence. Khudiaiev clarifies the system does not introduce new cryptographic primitives, replace ledger databases, or address threats beyond its explicitly defined trust boundary.

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