Certificate verification

Every certificate TiEEdu issues is signed. Enter a serial to check the signature against the record we hold.

The name, course title, lesson count and issue date above are covered by the signature. The XP figure is shown for context; XP itself is recorded in a separate append-only ledger.

Certificates are signed with Ed25519, so the check does not rest on trusting this site: the matching public key is published at /api/courses/verify/key and anyone can verify a certificate themselves against it. The key id above identifies which key was used, and older certificates stay verifiable after we rotate to a new one.