{
  "alg": "ed25519",
  "public_key": "4bc079775b77a6498b91185f9e5fded294a58463a07c96b74a8c27b9b3f8879d",
  "how": "Canonicalize the body (sorted keys, compact separators, ensure_ascii=false), SHA-256 it, and verify the Ed25519 signature against public_key.",
  "demo": "https://shadow.rcqsignals.com/"
}