There are some issues need to be solved:
- System's user can have only one «account» (or «wallet») to vote. Nobody can vote twice.
- Nobody can't see your vote. To be clear, everyone can see it, but didn't know that it is YOU.
As I know, first issue is hard to implement, without making second one... But it is temporary problem =)
I agree, although block chain could actually solve some problems with electronic voting the data protection is a serious problem.
Forget about voting systems with block chain if data is not protected. BTW I have seen some ICOs who do promise to work with this kind of thing but that does not mean that they will solve the problems needed to implement this.
At the minimum I would like to see every ballot cryptographically secured, such that each ballot can be linked to the master key. None could then be independently printed or created.
Clearly paper ballots with blockchain would be superior to electronic voting machines.