AXO DOCS / Document Proof

Document Proof

Prove a document existed, in exactly this form, by a certain day. Your file stays on your device: this page computes its fingerprint locally and records only the fingerprint.

A stamp is public, forever. The fingerprint, the label and the filename you submit are published in AXO's open record. They cannot be edited or removed afterwards, and anyone can see them. Do not put anything private in the label or filename. The file itself is never uploaded and never seen by AXO.

Choose the file

Pick the exact file you want to prove. It is read on this device only, to compute its SHA-256 fingerprint.

Choose a fileor drop it here. Any type, up to 4 GB.

Fingerprinting on this device…

Label it

OPTIONAL

Helps you and others recognise this stamp. Public. Plain text, no web addresses.

Label0 / 80

Filename0 / 120

Sign as the owner

OPTIONAL

Without a signature the stamp is still valid proof that the fingerprint existed, but it is marked UNSIGNED everywhere: it does not show who stamped it. Signing with your wallet adds your address to the record, and you will see the exact fingerprint you are signing before your wallet opens.

Sign this stamp with my wallet

Ask a second person to co-sign. You will get a private link. They open it with the identical file and sign. This must happen the same UTC day, so the certificate stays one record.

Link an earlier version

OPTIONAL

If this file replaces an earlier version, pick that earlier file (it is fingerprinted here, never uploaded) or paste its fingerprint. Versions then read as a chain.

Earlier version file

Or its fingerprint

Seal it

This is exactly what becomes public:

I understand that this fingerprint and label are public forever.

Free to use. A stamp proves a file existed in this exact form by the seal day. It does not prove the contents are true or legally binding. Already have a stamp? Check a document.