{
  "manageEntity": {
    "action": "Save",
    "entityId": "193442",
    "entityType": "Track",
    "nonce": "0x745f47896cf866f87ca42eeaa1d47b562ab4ebda607e722d21276e821f6eec44",
    "signature": "0x7d83cd79a4fd10f4bd777806f7cc903a69f1a923cdb7fe054a5ee2700015dafd03af3dd88b9ce3963b133afa483f2eb1456f5d97bcc9fad4d8d7bd47815acdcd1b",
    "signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
    "userId": "370091516"
  }
}