Submit
Enter a serial number or SHA-256 hash, or upload the original file.
Verify an authorship certificate
Enter a SHA-256 hash or certificate serial number to verify authenticity.
StampR registry
Verification method
Drop a file here or click to choose
The file is not uploaded: only its cryptographic fingerprint is computed in your browser
None selected
Verification is public and independent. Uploaded files never leave your browser.
How verification works
Three steps. Instantly.
We match
We look for a match in the StampR register and validate the BORICA B-Trust timestamp.
We confirm
We return the certificate serial number, time and hash with a clear verdict: valid or not.
Why it matters
Anyone can verify. Without taking your word for it.
The timestamp is a standard one (RFC 3161). That means the certificate is verifiable not only here, but independently, with external tools. The proof does not depend on StampR.
Frequently asked questions
What does a “valid” certificate mean?
That the serial number or hash matches a record in the StampR register, and that the qualified timestamp (QeTS) from BORICA B-Trust is authentic and unaltered. The time and the authorship declaration are bound to that specific file.
Can I verify without StampR?
Yes. The timestamp is a standard RFC 3161 Time-Stamp Token, so it can also be verified independently with external tools against BORICA B-Trust’s public key.
Why does the original file sometimes appear?
Only if the author explicitly allowed the original to be shown for a valid hash or serial number. By default only the certificate data is returned, not the work itself.
What happens when there is no match?
If the hash or serial number matches no record, the check returns a clear negative result. That means no StampR certificate has been issued for that input.
StampR certificate and timestamp verification
Confirm validity via serial number or SHA-256. We cross-check the StampR registry and validate the QeTS (signature/time, UTC traceability) issued by BORICA – B-Trust under eIDAS/ETSI.