{
  "manageEntity": {
    "action": "Save",
    "entityId": "45019743",
    "entityType": "Track",
    "nonce": "0x3ce2330437497179e3f1a1dc37085a7aef10b2c8d8706e2b8fa4eaa42f5b9e73",
    "signature": "0x8a5f3ea48eab1e53b5439bb628af33e0e757b76ab9d57508b6bfbf546d852bc022ad12fcd22447136bcc6ff408a61b6a1d9dedb3a43c044146e585aefe5692ba1b",
    "signer": "0x7848c1438a663A70aF2A2B1e61f7A9229dcc818e",
    "userId": "490080902"
  }
}