{
  "manageEntity": {
    "action": "Save",
    "entityId": "505699",
    "entityType": "Track",
    "nonce": "0xc970c4138bea4cbddc87d15bf8a50507a79e908e6b974b7bdc2864e6badcf263",
    "signature": "0x993493664d6bf9427d692e4655442adb03a0d767bc3b69f2c7ec21548351e7b141c3c306c11be312e76f92d87c8557bce62e6fd8cc906e8119c8704fea25aa451c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}