This is a good overview about why estonia is the only country to do online voting. TL;DR: Cybersecurity is hard.
However if you are going to do evoting, you can check how estonia addresses:
- Voter anonymity : It is like absentee voting, in that you put your vote inside a voter declaration letter. So I am guessing that, you encrypt your vote then attach it to a database. Then it is sent via a network valve on vote count that only allows one vote per citizen though to the other side.
- Voter buyoff : You can vote multiple time, but only the last vote counts
Still it would be nice if Pirate Party has a more active internal voting system. At the moment its mostly just voting very occasionally. Have you guys checked with NewVote and their app system and if it can apply to the pirate party?