How a hash chain makes an Oil Record Book tamper-evident

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Planned scope. Worked explanation: each entry’s hash includes the previous entry’s hash; any edit breaks the chain; what an inspector verifies

Regulatory anchor. IMO Res MEPC.312(74); FIPS 180-4 (SHA-256)

Cluster. Maritime cyber resilience and records integrity. Catalogued in research/maritime-cyber-and-records-integrity.md.

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