# Hash-chained audit trail

A trail that links each Final entry — and every event, from the moment an entry is created — to the one before it, so altering any historical record breaks the chain and becomes detectable; Ledgerbook ships it on by default and verifies online or offline, without ledger access.

- Source: [Ledgerbook glossary](/glossary/)
- Related: [Accounting data layer](/glossary/accounting-data-layer/), [Ledger of record](/glossary/ledger-of-record/), [Bitemporal ledger](/glossary/bitemporal-ledger/)