{
  "manageEntity": {
    "action": "Save",
    "entityId": "1866356520",
    "entityType": "Track",
    "nonce": "0x2d76830e089490ea80a949677d68f9e7b9f5dac0d3eb50cc720f8fe957a010b3",
    "signature": "0xb41cc0e9020db77e070674a6905474d63264caeaf46d50dead53ae16e11d001d70135fede952a6d267ee77a50e4a4d9795d2e24df439b01be551612a6dd1b66b1b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}