The simple answer is to combine blockchain with legacy methods of verifying that votes aren't sold or double voting occurs. So that probably still means going t

The simple answer is to combine blockchain with legacy methods of verifying that votes aren't sold or double voting occurs. So that probably still means going to a physical polling location for the forseeable future. The use of blockchain tech wouldn't initially replace that, it would just provide a 100% accurate paper and open trail of the vote.