{
  "manageEntity": {
    "action": "Save",
    "entityId": "1508757825",
    "entityType": "Track",
    "nonce": "0x850dc87bc2cec3f73ef352da024e8689f2ab4ff790703087edaf1b34d862e36b",
    "signature": "0x7be4a82972862f9f60d39bc9f8b409f716dbeb03e040c3cceedead9dd3ec9aba4aaf67e176d68f18935d81a1f3b1f40e1e8f857a12a9370dd460aa298ab102041b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}