{
  "$schema": "https://lunarasociety.com/.well-known/assertion.schema.json",
  "assertion": {
    "version": "lunara-assertion-1",
    "type": "document-integrity",
    "issuer": "https://lunarasociety.com",
    "subject": "https://lunarasociety.com/corpus/registry-protocol.json",
    "statement": "Lunara Society published this registry contract. Every response shape in it carries an evidence mark: verified means observed from the live endpoint on the date given, unverified means expected and never observed.",
    "evidence": "verified",
    "claims": {
      "digest": {
        "alg": "sha-256",
        "encoding": "base64url",
        "value": "xJm0cwmsrcbXwi87W6fa0KCVCSuAeKQRIyxtxnAoOSw"
      },
      "bytes": 5201,
      "media_type": "application/json",
      "document_version": "LUNA-PROTO-1"
    },
    "issued_at": "2026-08-24T17:33:22.548Z",
    "expires_at": "2027-08-24T17:33:22.548Z",
    "key_id": "luna-2026-Uju42vez3TYJh_2a"
  },
  "signature": {
    "alg": "EdDSA",
    "curve": "Ed25519",
    "key_id": "luna-2026-Uju42vez3TYJh_2a",
    "keys": "https://lunarasociety.com/.well-known/keys.json",
    "value": "GGemBHgvot6M3MTEKvQg44ZoJkF_mcFpQweO88BacF_8ID9uIHrvMhap01fKhmHcHEeT42mCw264MTS1o2alBg"
  },
  "how_to_verify": "Take assertion, serialise it as RFC 8785 canonical JSON, and verify signature.value as Ed25519 over those bytes using the key whose kid is signature.key_id from https://lunarasociety.com/.well-known/keys.json. Then SHA-256 the subject document as served and compare it to assertion.claims.digest.value. Both must hold. Nothing needs to be fetched from this institution to check the maths."
}