{
  "manageEntity": {
    "action": "Save",
    "entityId": "77422224",
    "entityType": "Track",
    "nonce": "0x484ada119d4dffab855d43abba39cb08a738cbb129553adb1342babc3c074cb4",
    "signature": "0x458be54254e8ff623b22df6f9a8d9624a44a3080e89dbb981578c316eb481d1c123a85d0d6f2200f10745f724d4c414f476fbd47354934eab4cc20b897b84af41c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}