challengeyou

{
  "name": "claimreward",
  "base": "",
  "fields": [
    {
      "name": "challenge_id",
      "type": "uint64"
    },
    {
      "name": "username",
      "type": "name"
    },
    {
      "name": "user_position",
      "type": "pair_float64_float64"
    },
    {
      "name": "desc",
      "type": "string"
    }
  ]
}