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.

Canonical definition from the Ledgerbook glossary. Definitions are the product vocabulary — the same terms the API and MCP tools use.