Every certificate is signed with an app-wide Ed25519 keypair at the moment it is issued. A SHA-256 fingerprint is taken of the certificate's immutable data, and both the fingerprint and the signature are shown on the verification page and independently checkable, without any wallet, NFT or blockchain. Tampering with any signed field breaks both the fingerprint and the signature.
Where to find it
Every verification page marks the certificate as cryptographically signed and shows its fingerprint with a Verify signature link. The public key is published, so anyone can check a certificate against it. There is nothing to set up.
Plan required
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