{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "event_id": {
      "type": "string",
      "pattern": "^evt_[0-7][0-9A-HJKMNP-TV-Z]{25}(?![\\s\\S])"
    },
    "provider": {
      "type": "string",
      "format": "uri"
    },
    "read_id": {
      "type": "string",
      "pattern": "^rd_[0-7][0-9A-HJKMNP-TV-Z]{25}(?![\\s\\S])"
    },
    "grant_id": {
      "type": "string",
      "pattern": "^gr_[0-7][0-9A-HJKMNP-TV-Z]{25}(?![\\s\\S])"
    },
    "client_id": {
      "type": "string",
      "minLength": 1,
      "maxLength": 2048
    },
    "at": {
      "type": "string",
      "format": "date-time",
      "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z))$"
    },
    "purpose": {
      "type": "string",
      "enum": [
        "booking",
        "recommendation",
        "safety",
        "fulfilment",
        "personalisation",
        "research",
        "care",
        "medical",
        "employment",
        "advertising"
      ]
    },
    "surface": {
      "type": "string",
      "enum": [
        "rest",
        "mcp_tool",
        "mcp_resource",
        "mcp_briefing"
      ]
    },
    "request": {
      "type": "object",
      "properties": {
        "domains": {
          "minItems": 1,
          "maxItems": 32,
          "type": "array",
          "items": {
            "type": "string",
            "pattern": "^[a-z][a-z0-9_.-]{0,63}$"
          }
        },
        "max_level": {
          "type": "string",
          "enum": [
            "L0",
            "L1",
            "L2",
            "L3"
          ]
        },
        "keys": {
          "minItems": 1,
          "maxItems": 128,
          "type": "array",
          "items": {
            "type": "string",
            "pattern": "^[a-z][a-z0-9_.-]{0,63}$"
          }
        },
        "declared_only": {
          "type": "boolean"
        },
        "min_confidence": {
          "type": "number",
          "minimum": 0,
          "maximum": 1
        },
        "since": {
          "type": "string",
          "format": "date-time",
          "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z))$"
        }
      },
      "required": [
        "domains",
        "max_level",
        "declared_only",
        "min_confidence"
      ],
      "additionalProperties": false
    },
    "returned": {
      "maxItems": 1000,
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "entry_id": {
            "type": "string",
            "pattern": "^ent_[0-7][0-9A-HJKMNP-TV-Z]{25}(?![\\s\\S])"
          },
          "version": {
            "type": "integer",
            "exclusiveMinimum": 0,
            "maximum": 9007199254740991
          },
          "level": {
            "type": "string",
            "enum": [
              "L0",
              "L1",
              "L2",
              "L3"
            ]
          }
        },
        "required": [
          "entry_id",
          "version",
          "level"
        ],
        "additionalProperties": false
      }
    },
    "response_hash": {
      "type": "string",
      "pattern": "^sha256:[a-f0-9]{64}$"
    },
    "prev_hash": {
      "anyOf": [
        {
          "type": "string",
          "pattern": "^sha256:[a-f0-9]{64}$"
        },
        {
          "type": "null"
        }
      ]
    },
    "hash": {
      "type": "string",
      "pattern": "^sha256:[a-f0-9]{64}$"
    },
    "proof": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "const": "jws"
        },
        "alg": {
          "type": "string",
          "const": "ES256"
        },
        "kid": {
          "type": "string",
          "pattern": "^[A-Za-z0-9_-]{42}[AEIMQUYcgkosw048]$"
        },
        "jws": {
          "type": "string",
          "pattern": "^[A-Za-z0-9_-]+\\.\\.[A-Za-z0-9_-]+$"
        }
      },
      "required": [
        "type",
        "alg",
        "kid",
        "jws"
      ],
      "additionalProperties": false
    }
  },
  "required": [
    "event_id",
    "provider",
    "read_id",
    "grant_id",
    "client_id",
    "at",
    "purpose",
    "surface",
    "request",
    "returned",
    "response_hash",
    "prev_hash",
    "hash",
    "proof"
  ],
  "additionalProperties": false
}