How this check works

The QR code on a Sanmaan certificate contains the recipient's details and a digital signature made with the issuer's private key. This page re-checks that signature in your browser — nothing is sent anywhere. If even one letter of the name, course or date was changed, the signature fails.

To be sure the certificate came from the organisation named on it, compare the issuer fingerprint below with the one they publish (for example on their website or official letterhead).