# Immutable Events

> The requirement that recorded events never change once written, only be appended to.

Record: `lex:immutable-events`
Kind: constraint
Layer: [Execution Core](https://banes-lab.com/records/layer/execution-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lex-immutable-events

## category

- [Event Messaging Async](https://banes-lab.com/records/lex-category/event-messaging-async.md)

## referenced-by

- [Append-Only Log](https://banes-lab.com/records/arch/append-only-log.md)