{
  "manageEntity": {
    "action": "Save",
    "entityId": "1590680551",
    "entityType": "Track",
    "nonce": "0x1c49a2c5a7cdebd0fc095227f674e83a78eab773ca137c1610e270904677a317",
    "signature": "0x008e5d35f966d483ba4c6467d200a094c7b994d5135e62e94f4857555b19279f78f8786d51ac97505b3d517220ee666e11fbb2617300b3c0fbbfbf8512cc3b851c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}