Create a Bitcoin-backed timestamp receipt without uploading your file
HashDocket computes SHA-256 locally in your browser. You can create a free OpenTimestamps receipt and keep the original file private. If you also want a public searchable proof record, HashDocket offers optional Bitcoin-paid publication.
Open HashDocketHow it works
Useful for contracts, source archives, research drafts, creative work and any file where you need a later byte-for-byte comparison.
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.