Independent verification
Verify a document fingerprint
Check that a document matches a fingerprint inscribed on Bitcoin. Everything happens in your browser: the file is never uploaded, and this page makes no network calls. You can even use it offline.
1. Your document (hashed locally, never sent)
Drop the document here or click to select it
2. The reference fingerprint
Paste the fingerprint shown on the certificate, or read from the transaction’s OP_RETURN output.
Drop the preuve-btc3r-*.json file here or click to select it
Reminder: this check confirms that the document matches a fingerprint. To confirm that the fingerprint is actually inscribed and timestamped on Bitcoin, open the transaction on a public explorer (the TXID is on your certificate) and locate its OP_RETURN output. How to verify an inscription?