Fingerprint a file locally and verify the exact version later

A SHA-256 fingerprint changes when the underlying bytes change. HashDocket calculates the fingerprint on your device and can later look up a published proof record without needing the source file.

Open HashDocket

How it works

This is a technical proof record, not a claim of authorship, ownership or legal validity.

Privacy first

HashDocket does not need the original file for the main workflow. The file is hashed locally and only the cryptographic fingerprint is used for verification and optional publication.

HashDocket is an independent cryptographic registry and is not a qualified electronic timestamp or notary service.