Stamp & Verify
Certify a file now. Verify any copy later.
Drop a file to create a proof. The proof file downloads automatically. Later, drop the proof file and any copy of the document to check whether it still matches the originally certified file.
Stamp
Drop a file to certify. The hash is computed in your browser. The proof file downloads automatically.
Waiting for file
Proof generation will start as soon as a file is selected.
The proof file contains the event identifier, the file fingerprint, and the public proof URL.
Keep it with the document if you want to verify any later copy without searching for the proof manually.
Proof QR
Verify
First drop the proof file. Then drop the file you want to check.
Step 1
Load a proof file first.
Waiting for proof file
Verification needs a proof file first.