{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://www.trinityaccord.org/api/guardian-presence-proof-schema.v1.json",
  "title": "Trinity Accord Guardian Presence Proof Schema v1",
  "description": "Schema for Guardian key-continuity presence proof. Proves key possession only.",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schema",
    "proof_mode",
    "method",
    "algorithm",
    "guardian_id",
    "public_key_pem",
    "public_key_sha256",
    "signed_payload_sha256",
    "challenge",
    "challenge_sha256",
    "signature_base64",
    "signed_message",
    "created_at",
    "proof_scope",
    "does_not_prove"
  ],
  "properties": {
    "schema": {
      "type": "string",
      "const": "trinityaccord.guardian-presence-proof.v1"
    },
    "proof_mode": {
      "type": "string",
      "enum": ["record_bound"],
      "description": "record_bound for V1; live_challenge reserved for future V2"
    },
    "method": {
      "type": "string",
      "const": "guardian_key_signature"
    },
    "algorithm": {
      "type": "string",
      "const": "ed25519"
    },
    "guardian_id": {
      "type": "string",
      "pattern": "^guardian_ed25519_[a-f0-9]{16}$"
    },
    "public_key_pem": {
      "type": "string",
      "minLength": 80,
      "maxLength": 1000,
      "pattern": "^-----BEGIN PUBLIC KEY-----[\\s\\S]+-----END PUBLIC KEY-----\\s*$"
    },
    "public_key_sha256": {
      "type": "string",
      "pattern": "^[a-f0-9]{64}$"
    },
    "signed_payload_sha256": {
      "type": "string",
      "pattern": "^[a-f0-9]{64}$"
    },
    "challenge": {
      "type": "string",
      "minLength": 1,
      "maxLength": 500
    },
    "challenge_sha256": {
      "type": "string",
      "pattern": "^[a-f0-9]{64}$"
    },
    "signature_base64": {
      "type": "string",
      "minLength": 40,
      "maxLength": 500
    },
    "signed_message": {
      "type": "string",
      "minLength": 80,
      "maxLength": 2000
    },
    "created_at": {
      "type": "string",
      "maxLength": 80
    },
    "proof_scope": {
      "type": "string",
      "const": "key_possession_only"
    },
    "does_not_prove": {
      "type": "array",
      "items": { "type": "string" },
      "minItems": 12,
      "description": "Must include all boundary declarations"
    }
  }
}