# Cryptographic Hash **Domain:** Cryptography / Data Integrity **Doc Type:** Technical Concept Node **Maturity:** Established **Related:** [[Honest Computing]], [[Neural Data Provenance]], [[Security by Design]] --- ## Definition A **cryptographic hash** maps input data to a fixed-size digest designed to make undetected modification and collision computationally difficult. Hashes support integrity checks, content addressing, signatures, manifests, and chained audit records. ## Evidentiary boundary A matching hash shows that bytes match a referenced version. It does not prove that the source was truthful, consent was valid, interpretation was correct, or custody was legitimate.