{
  "manageEntity": {
    "action": "Save",
    "entityId": "703999",
    "entityType": "Track",
    "nonce": "0x6f735a1bbebf8a41a475795c5d8d9460ea7fec481e6febec0a00104d7afe874b",
    "signature": "0x48b7ebd5935c0babbcffed7183cb834da2312fc451d59d670cceff99616868ed18fe84f7051e317fed26ef48c3dae8f78c83808b8721966a79f150540485feeb1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}