{
  "manageEntity": {
    "action": "Save",
    "entityId": "123907",
    "entityType": "Track",
    "nonce": "0xbe9f26660d064aca1ea54fc3dd17cf8bd3d775b986ce65d3b5e04330b96a366f",
    "signature": "0xd89f896f60494d9a661d4da6e7878e1bf7172d0a1915c66bb9bef6899bfea18a2654e243d52848cec78370aa6a1f502b663736fa60cf86730e054e9bdb610d7b1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}