Transaction

{
  "create_auction": {
    "collection": "cosmos1ygjjyu0errftcq4cmyzen0g9na4pwv8qdy6z757mkx4g76xk2kyq5agxa0",
    "token_id": "81",
    "reserve_price": {
      "amount": "5000000",
      "denom": "uatom"
    },
    "buy_now_price": null,
    "duration": 43200
  }
}