{
  "manageEntity": {
    "action": "Save",
    "entityId": "447258199",
    "entityType": "Track",
    "nonce": "0xdc46c92bdd1e6983f45ed0b0c91b8ed8930e42c9605a696316c85240c633ba35",
    "signature": "0xcc73c881116fae24caaf2fe7784aa080b7f40ae37270310d7d52925b746248312518a2f1040071e71657ba26783645fd6118170f9bd6b05d0dbc39067c1852ca1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}