Hash: SHA256
If you would like to validate that the binaries you download are exactly the same as those provided and built by the Qtum team, then you can compare your binaries to the following sha256sum hashes:
a3e76c855b7f424d67fd690611b767a16d6f3967e70d7a662dce21cc3a21682e ./Qtum-electrum-v4.0.21-portable.exe
ba7eb458741d941eb2f1ec269c36ec8e8a9ce96f5444a66986027f538d84610b ./Qtum-electrum-v4.0.21-setup.exe
27956c707c2cd4e08649b9558caaa5417118d56029fad1082fa74599b662ac5a ./Qtum-electrum-v4.0.21.dmg