{
  "manageEntity": {
    "action": "Save",
    "entityId": "737782857",
    "entityType": "Track",
    "nonce": "0x5150103a15cf73b46fdace75f5866650e66b702052a60ec464eaf64f751732c7",
    "signature": "0xa5042dbca7d9f80075825a55ea6d0e8ba2b60c770f5686e66285de97e7fef5917f7f7b3a96af68a5397279c30fa5432e16c8551dc5aa0132cc35cc5c952230b81b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}