{
  "manageEntity": {
    "action": "Save",
    "entityId": "1584717473",
    "entityType": "Track",
    "nonce": "0x74bc1b984fec355ea4fab6994e3ebdfdbbbef984261f51c30632402d46ef1338",
    "signature": "0x5a6f9c4feb5a46305437228a4d1d9b27bc635d8bd59de75de4ee4772eabb19d97df7a7272140eef2cbb31d3adc5d533d28e1d2459409817e9aa77adb680ecf301c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}