1.) how do you prevent bad actors from voting multiple times?  What limits are there on making an account?

2.) In this system you will be able to verify to a 3rd party what your vote was, and with that it becomes far easier to buy/sell votes.  This has already been a problem in some places, Hong Kong for example https://www.reddit.com/r/worldnews/comments/53bq34/hong_kong_election_ballot_papers_outnumbered/d7rtxyj

I only see this getting worse in this kind of system, do you have any solution in mind for that?