{
  "manageEntity": {
    "action": "Save",
    "entityId": "452655",
    "entityType": "Track",
    "nonce": "0x5adb293b20fe42610451e48c3c413f224a0ac1d00867c0df8afbaa9c414ab0d8",
    "signature": "0x2832612438b6cb28b568c54c15f2c3769d218cf11cd3efa139666173ebe10e052cde840cc62f1bc612ed6269ed1758b50e4a2e0d8e594840796e4a3f799b08951c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}