{
  "spec": "https://umfr.io/docs/receipt",
  "keys": [
    {
      "kid": "umfr-receipt-2026-10-a",
      "alg": "Ed25519",
      "publicKey": "Czl1OfcWGTAQzag6gTOPylsuMjNxPWgIO2_iSDD2h1k",
      "validFrom": "2026-10-12",
      "validTo": null,
      "status": "active",
      "revoked": null
    }
  ]
}