Immutable record

An immutable record is a data entry that, once written, cannot be altered or deleted by any participant in the system. Immutability is enforced not by policy but by architecture: in blockchain systems, each block contains a cryptographic hash of the previous block, so altering any historical record would break the chain and be immediately detectable. In distributed ledger systems, immutability is the guarantee that the shared history of transactions is a single, append-only timeline that no single actor can rewrite.

The value of immutability is not merely technical; it is epistemic. An immutable record creates a shared ground truth that survives disputes, audits, and attacks. But immutability is also a trap: it means that errors, fraud, and sensitive data cannot be erased. The assumption that immutability equals trustworthiness ignores the garbage-in-garbage-out problem — an immutable lie is just a permanent lie. True trustworthiness requires not only immutability but also verifiable provenance, which is a harder problem that no current system fully solves.