challengeyou

{
  "name": "newaccount",
  "base": "",
  "fields": [
    {
      "name": "username",
      "type": "name"
    },
    {
      "name": "user_pubkey",
      "type": "public_key"
    },
    {
      "name": "referrer",
      "type": "name"
    }
  ]
}