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Developer builds tamper-evident audit log in Go using SHA-256 hash chaining

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A developer learning Go has built a tamper-evident record log that uses SHA-256 hash chaining to make unauthorized edits cryptographically detectable. Each log entry stores a hash of the previous entry, forming a linked chain where any modification breaks all subsequent hashes. The approach mirrors the core primitive used in blockchain, Amazon QLDB, Certificate Transparency logs, and Git commit histories, but without distributed consensus overhead. Practical use cases include verifying medical records, chain-of-custody logs, and audit trails that third parties can independently check. The current implementation is a CLI demo over a single JSON file, with the developer noting that external hash anchoring is needed to prevent a full chain rewrite by someone with full storage access.

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Developer builds tamper-evident audit log in Go using SHA-256 hash chaining · ShortSingh