{
  "manageEntity": {
    "action": "Save",
    "entityId": "2047690405",
    "entityType": "Track",
    "nonce": "0xc433ed09d5ec9d39e10b004e5e1afe28177a080fad759378ca8ad207165e3871",
    "signature": "0x2415dacc2854d596773defd2c688770f1637d3444496f6f94c3559ffa83fd6605db4f08900fc9d54fea478474352d49e7eddab41576cd16594a3809c462e19261b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}