# Deduplication Key

> A stable identifier attached to a message that lets a consumer detect and drop duplicates.

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

## category

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

## referenced-by

- [Idempotent Consumer](https://banes-lab.com/records/arch/idempotent-consumer.md)