Demonstrated for real
Warrant signing and gate verification. The page generates an ephemeral Web Crypto keypair, canonicalizes the immutable outward warrant payload, signs it, and verifies the signature against the known public key during gate step 4. The displayed prefix is ed25519: or ecdsa-p256: according to the algorithm actually used.
Modeled and labeled
Key custody. UI label: “Keys are generated in-page and ephemeral, demonstrating the signature/verification mechanism. Production requires key custody in an HSM/KMS under community control.”
Not attempted, and why
HSM/KMS custody, key rotation, and compromise runbooks. A public static page cannot provide community-controlled hardware custody, durable issuer operations, or incident response.