Developer Fixes Critical Flaws in AI Agent's Tamper-Evident Audit Log

A developer building an autonomous AI system discovered that its append-only audit log, meant to prevent history tampering, was fundamentally broken despite appearing functional. Two separate components were writing to the same log file in incompatible formats, with no locking mechanism, causing race conditions that corrupted the hash chain. Real corrupted records were found where stored hashes did not match their content, bearing the signature of concurrent writes. The team resolved the issues by routing all audit writes through a single locked implementation, anchoring the chain with an external cryptographic signature inaccessible to the runtime, and scheduling automated verification checks. The fixes highlight that a hash chain alone represents only a fraction of what a genuinely tamper-evident audit log requires.