{
  "manageEntity": {
    "action": "Save",
    "entityId": "1567388629",
    "entityType": "Track",
    "nonce": "0xbaab9b94cda52a95a381c4e1ed539142cdc0e5bf032a325e33025e9089b8212c",
    "signature": "0x774d7e285b3731df83563b647c8c2157d1af792d0015a7944b18a34269537c7e6f0bdc1a231a06f339a901b6b17477eb1817fbedee974961dfcd3d8b3ff0a3011b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}