{
  "manageEntity": {
    "action": "Save",
    "entityId": "321540",
    "entityType": "Track",
    "nonce": "0x54e68e154fac86e492aa1be8ca4f2779b992fca7e2e1b2224d2f9d243022d150",
    "signature": "0x5136835532dda73610ab3a9026095cd22fe6445201efe72f97346505ea97eaef11dd3548ac3d78439ffe81fd8dbc192cfef24228a124189a0c81f2c0ed6dd2e81c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}