{
  "manageEntity": {
    "action": "Save",
    "entityId": "685502851",
    "entityType": "Track",
    "nonce": "0x709c31910f3ffa9bf0a09c987012f025bb49866e41346fed0e4cb398ff218074",
    "signature": "0xc47243a88dbdcbfb0e304d9fd16edb357d5040de11a9b94955d2eace1129f52e26c821c2089e8fbb88bc3a7ac3e90276b1c8a6f133d0ef9b88c63e2c038c7e0d1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}