Immutable Ledger
A tamper-evident record-keeping mechanism (e.g., blockchain) ensuring that once data are written, they cannot be altered without detection—useful for AI audit trails.
Definition
A write-once, append-only data store where each record references the previous via cryptographic hashes, making any alteration immediately apparent. In AI governance, immutable ledgers can record data-ingestion events, model-training parameters, or prediction logs to provide provable audit trails. Governance must manage ledger access, ensure scalability, and integrate ledger verification into compliance audits.
Real-World Example
A healthcare AI logs every model inference (input hash, model version, output) to a private blockchain. When regulators request logs for a given patient-visit, auditors verify entries on the ledger—guaranteeing no tampering and providing full transparency into the AI’s decision history.
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