{
  "manageEntity": {
    "action": "Save",
    "entityId": "583925465",
    "entityType": "Track",
    "nonce": "1788584586953896632",
    "signature": "0x2910c02bb3ece9db07619ca612834ce5ecdcc1c498fe9664739b61ecf7a3884c4185988a1220aa4f23f1b1dea091aaa66967f62372d44fae5928ad42770cc58f1c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}