{
  "manageEntity": {
    "action": "Save",
    "entityId": "564469502",
    "entityType": "Track",
    "nonce": "0x8981eec6587f7ac7d9cb87f715b9f5d631ce00193f47ad6b6c54a3e6f6919c32",
    "signature": "0xdf52261063a12f8a38b7ff6d221cab26863c6a489e5221b5a6a16380988805b65d7c9d0356059e5035230b5cb5c2bea643ac1f45e105d8aa9867ede649a75a351c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}