{
  "manageEntity": {
    "action": "Save",
    "entityId": "828628287",
    "entityType": "Track",
    "nonce": "0x1c678956f5512dc99db13a77299a85a2e6f9e0807b7067e6ecab01a34b0c83e9",
    "signature": "0xff3d66f486b1107028768fe7418c67376a6a37a684106221a5cfbf70182a9bf620d7497389691880919aa97bb687e1b613723950fe1388d435eafeca99b549d71c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}