{
  "$defs": {
    "SiwsChallenge": {
      "description": "SIWS challenge issued by MARS and signed by a Sigil wallet.",
      "properties": {
        "audience": {
          "description": "Sign-in audience.",
          "type": "string"
        },
        "chainId": {
          "description": "Sigil chain identifier.",
          "type": "string"
        },
        "expiresAtMs": {
          "description": "Challenge expiry time in Unix milliseconds.",
          "format": "int64",
          "type": "integer"
        },
        "hmrDid": {
          "description": "HMR DID expected to sign.",
          "pattern": "^did:oas:",
          "type": "string"
        },
        "issuedAtMs": {
          "description": "Challenge issue time in Unix milliseconds.",
          "format": "int64",
          "type": "integer"
        },
        "kind": {
          "description": "Protocol discriminator. Current value is `sigil.signin`.",
          "pattern": "^sigil\\.signin$",
          "type": "string"
        },
        "nonce": {
          "description": "Single-use challenge nonce.",
          "type": "string"
        },
        "origin": {
          "description": "Request origin.",
          "type": "string"
        },
        "requestId": {
          "description": "Single-use request identifier.",
          "type": "string"
        },
        "rootDid": {
          "description": "Optional authorizing HMR, MHR, or ENR root DID.",
          "type": [
            "string",
            "null"
          ]
        },
        "version": {
          "description": "SIWS wire version. Current value is `1`.",
          "format": "uint8",
          "maximum": 1,
          "minimum": 1,
          "type": "integer"
        }
      },
      "required": [
        "kind",
        "version",
        "origin",
        "audience",
        "chainId",
        "nonce",
        "requestId",
        "hmrDid",
        "issuedAtMs",
        "expiresAtMs"
      ],
      "type": "object"
    }
  },
  "$id": "urn:mars:schema:v1:siws-challenge-response",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "description": "Response body for `POST /v1/auth/siws/challenge`.",
  "properties": {
    "challenge": {
      "$ref": "#/$defs/SiwsChallenge",
      "description": "Challenge that must be echoed during verification."
    }
  },
  "required": [
    "challenge"
  ],
  "title": "SiwsChallengeResponse",
  "type": "object"
}