{
 "keys": [
  {
   "kty": "OKP",
   "crv": "Ed25519",
   "kid": "fc-x402-2026-09",
   "x": "VgVpJyadHOlLvpPevyxcKY9BeTdj_vFN3RN0t6IqHtg",
   "use": "sig",
   "alg": "EdDSA"
  }
 ]
}