{
  "manageEntity": {
    "action": "Save",
    "entityId": "1903309445",
    "entityType": "Track",
    "nonce": "0xed31f37a1d73b5c4095e1b2dd76094e7e35a6934186217cbaf9837926a9cfa9a",
    "signature": "0x5dd1e83b9b4483a21f535bfa8254070d0668e7ff2ac9b87705eea5616f9378577f5cd48233708ed9cc4936989c9fda3641291a90c29e6b203b0f37e1eb0dfd7f1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}