Transaction

{
  "create_auction": {
    "buy_now_price": {
      "amount": "125000000",
      "denom": "uatom"
    },
    "collection": "cosmos174qg90pry2sxq8c0h0fvpaks7f0wndvvafyetn3fzt4urw8ehv4q97073l",
    "duration": 604800,
    "reserve_price": {
      "amount": "100000",
      "denom": "uatom"
    },
    "token_id": "19"
  }
}