{
  "manageEntity": {
    "action": "Save",
    "entityId": "1623478666",
    "entityType": "Track",
    "nonce": "0x4999f93e0c0f3db2abcaf3458e21683c442bffc1409d2fde1d295bff9e93befb",
    "signature": "0xe0960e205c64447bffe5eeec2c7b032ecab252785a8790e163c31bba6114cd740c38254123ce2b5de386dbd4697414af364eca025909322d17a96d9235453e241b",
    "signer": "0x635a32c502d056dd6e3f4aC1eb15Fb0d90a88171",
    "userId": "1640466"
  }
}