{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://eips.ethereum.org/assets/erc-8410/typed-data-signature-request.schema.json",
  "title": "Portable typed-data request",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schema_version",
    "kind",
    "signer",
    "typed_data"
  ],
  "properties": {
    "schema_version": {
      "const": "1"
    },
    "kind": {
      "const": "typed_data_signature_request"
    },
    "signer": {
      "type": "string",
      "pattern": "^0x[0-9a-fA-F]{40}(?![\\s\\S])"
    },
    "typed_data": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "types",
        "primaryType",
        "domain",
        "message"
      ],
      "properties": {
        "types": {
          "type": "object",
          "required": [
            "EIP712Domain"
          ],
          "maxProperties": 128,
          "propertyNames": {
            "type": "string",
            "pattern": "^[A-Za-z_][A-Za-z0-9_]*(?![\\s\\S])"
          },
          "additionalProperties": {
            "$ref": "#/$defs/TypeMembers"
          },
          "properties": {
            "EIP712Domain": {
              "$ref": "#/$defs/TypeMembers"
            }
          }
        },
        "primaryType": {
          "type": "string",
          "pattern": "^[A-Za-z_][A-Za-z0-9_]*(?![\\s\\S])",
          "not": {
            "const": "EIP712Domain"
          }
        },
        "domain": {
          "type": "object"
        },
        "message": {
          "type": "object"
        }
      }
    },
    "valid_until": {
      "type": "string",
      "pattern": "^(0|[1-9][0-9]*)(?![\\s\\S])",
      "maxLength": 20
    },
    "delivery": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "url",
        "request_id"
      ],
      "properties": {
        "url": {
          "type": "string",
          "pattern": "^https://[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?(?:\\.[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?)+/(?:[A-Za-z0-9_-]+(?:/[A-Za-z0-9_-]+)*)?(?![\\s\\S])",
          "maxLength": 2048
        },
        "request_id": {
          "type": "string",
          "pattern": "^[A-Za-z0-9_-]{1,128}(?![\\s\\S])"
        }
      }
    }
  },
  "description": "Structural checks only. The signature-request specification additionally requires uint64 cutoff bounds, duplicate-key rejection before parsing, recursive EIP-712 validation, canonical scalar encodings, resource limits, authorization, and verified same-origin delivery. JSON Schema cannot enforce those rules.",
  "$defs": {
    "TypeMembers": {
      "type": "array",
      "maxItems": 128,
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "name",
          "type"
        ],
        "properties": {
          "name": {
            "type": "string",
            "pattern": "^[A-Za-z_][A-Za-z0-9_]*(?![\\s\\S])"
          },
          "type": {
            "type": "string",
            "minLength": 1,
            "maxLength": 128
          }
        }
      }
    }
  }
}