{
  "manageEntity": {
    "action": "Save",
    "entityId": "579147944",
    "entityType": "Track",
    "nonce": "0xc544ee2d9b6bca71c6ea71ea0e2d1e1029ac94c7f9ac20f9deaa3bc9641702c7",
    "signature": "0xa78ac5a7f95511897090391eac8cc2f79b2edefb23499defef6a10459f25d0f61659d02f32399866459b896e7919adc1ac88e5f40e48624e4801848d12d7e0ea1c",
    "signer": "0xc03cf24b1C519dA6a18B6509c7F5C57d01620755",
    "userId": "870665506"
  }
}