{
  "manageEntity": {
    "action": "Save",
    "entityId": "1491597591",
    "entityType": "Track",
    "nonce": "0x2b251440fd8b2689227b51b61ff5362b694249d223332015cae331f5484d9e89",
    "signature": "0x381ddb1dc56dd717f0182b6649ec76a8eb2f03f12b421744e3d75c3da2940e032e95fb77c55b88d900ad7e7bf75bb2a931700ac72eab313cfe1ed9341b748a871c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}