{
  "service": "SPIRALMESH receipts",
  "keys": [
    {
      "kty": "OKP",
      "crv": "Ed25519",
      "x": "kCHmD7ZypYAozCx_xesaYoeUEDGvwVFNDsSQptZgl9k",
      "kid": "k_a46a68adf5bc1237",
      "use": "sig",
      "alg": "EdDSA"
    }
  ],
  "verify": "A receipt body is canonical JSON (sorted keys, no spaces). receipt_hash is its SHA-256 in hex. signature is an Ed25519 signature, base64url, over the body bytes, made with the key named by key_id."
}