{
  "manageEntity": {
    "action": "Save",
    "entityId": "21384602",
    "entityType": "Track",
    "nonce": "0xcaca90c1cf03b904484020c491c3af66254c1948a74700bf2a97f0645ac8c5bb",
    "signature": "0x88bf316b5c0561ce76c6f521d02d48b4b1cd37e30082282f3a31012716502dc173f01c3b8368e1695abdf0d3beb8ae432c2daf2102e673e22c5b97bb8d0dc3551c",
    "signer": "0xf954E35976C0aAaEC2968197F2a371Cc99E7C81A",
    "userId": "102143"
  }
}