Why not just allow everyone to vote online, with no registration? Just type in your full name and select a candidate, no email or password required. It'd guarantee 100% turnout - maybe even >100% turnout, if enough bots join the fun!
The problem with digital voting is that it cannot be made sufficiently secure. It's not a matter of "there are problems we haven't solved yet", but rather "there are problems that we provably cannot solve".