# What is a correlation in Provely?

> The binding of evidence to the exact operation through keys such as a resource id. The Provely definition, with an example.

Canonical: https://provely.sh/glossary/correlation  
Last reviewed: 2026-09-05  

**Correlation binds the evidence to the exact operation. A contract names strategies such as the resource id from the action response, the idempotency key, or a fingerprint with a time window.**

A strategy is strong when its key is unique to this operation. It is weak when the key can match another operation, and then it must state a time window. An Official contract needs one strong strategy.

## Read next

- [Read the definition of Idempotency](https://provely.sh/glossary/idempotency)
- [Read the definition of False VERIFIED](https://provely.sh/glossary/false-verified)
- [See every glossary term](https://provely.sh/glossary)
- [Read how Provely works](https://provely.sh/how-it-works)