# OCEL 2.1

Object-Centric Event Log, the open standard for recording events together with the business objects they touch — the format process-mining and audit tooling consumes directly. Ledgerbook emits OCEL 2.1 and accepts OCEL 2.0 or 2.1 inbound.

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