HashDocket is an independent service and is not affiliated with proofstamp.org or any similarly named service.
Privacy-first • OpenTimestamps compatible • No file upload
Prove a file existed. Keep the file private.
HashDocket calculates a SHA-256 fingerprint entirely on your device. Publish that fingerprint in a public registry after a Bitcoin payment, then verify it later from anywhere.
Create a fingerprint
Your document stays on your device. Only its one-way SHA-256 fingerprint can be registered.
File
SHA-256 fingerprint
Publish a public registry record
Choose a proof pack, send the displayed amount to the official HashDocket Bitcoin address, then paste the transaction ID. Publication happens after the first network confirmation. A pack transaction can be reused until all of its proof credits are consumed.
Paste a SHA-256 fingerprint to check whether it has been published.
HashDocket combines a local SHA-256 fingerprint, an optional OpenTimestamps receipt, and a public registry entry. OpenTimestamps can attest that a hash existed before a Bitcoin block time once its receipt is upgraded and verified. The paid HashDocket registry separately records the fingerprint and references the Bitcoin payment transaction; the payment transaction itself does not embed the document hash. HashDocket is not a qualified electronic timestamp, not a notary service, and not legal advice. It does not by itself establish authorship, ownership, authenticity, or the original creation time of a document.