{
  "manageEntity": {
    "action": "Save",
    "entityId": "1245923721",
    "entityType": "Track",
    "nonce": "0xa3a7f615e8c8cac8cb5a49fea15d582e83fc525307174279d76c220658b68467",
    "signature": "0x6e1211820e12d7d0990f0501f5127aed287d9687d8fce39b3fd7ed3f620d478812d8d211ca156d74556814aa6789b744d21cb4f149462883766dd5d303a5acc81c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}