{
  "challenge": {
    "amount": "<UInt64>",
    "challenger": "<AccountAddress>",
    "expiration": "<Timestamp (e.g. `2000-01-01T12:00:00Z`)>",
    "game": "<String>",
    "is_public": "<Bool>",
    "opponents": {
      "Enum": [
        {
          "None": []
        },
        {
          "Some": [
            [
              "<AccountAddress>"
            ]
          ]
        }
      ]
    },
    "winner": {
      "Enum": [
        {
          "None": []
        },
        {
          "Some": [
            "<AccountAddress>"
          ]
        }
      ]
    }
  },
  "challenge_id": "<String>"
}

None

None

{
  "challenge_id": "<String>"
}

None

None