{
  "manageEntity": {
    "action": "Save",
    "entityId": "169637455",
    "entityType": "Track",
    "nonce": "1789924713263751746",
    "signature": "0x53e8704e36225b885f6df3a5ab8c195ec02278eea18ea332a3f4573574db5a791fd2854882b491370e626c144fd00b5d648f482278fbe6f1af85aa054ae3c17c1b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}