{
  "manageEntity": {
    "action": "Save",
    "entityId": "726905273",
    "entityType": "Track",
    "nonce": "0xbdf3ccfb7640b924267702d90fabec1ae1c8e03dfc882c6c0968cf944b7bf24d",
    "signature": "0x7137c209332157a9be687cf343fbf95109bc85bd0b9b6090c58604c69ef79b060ccc23bac73636920c8a8cf3a87126403eda75e025a3820986acec688ff7d3051c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}