Verify a determination certificate

Upload the certificate you were sent, or paste it below. This checks the cryptographic signature against our published public key. You do not need an account, and we do not record who you are.

You do not have to take our word for any of this. The signature is standard Ed25519 over the JSON-canonical form of the payload, and our public keys are published at /v1/verify/keys. A twenty-line script can do the same check offline, without contacting us at all — which is the point of issuing certificates rather than asking people to log in.