It doesn't. There is no such thing as fair and anonymous voting, digital or otherwise. If you can't tie a person to their vote, you will never know if they sol

It doesn't. There is no such thing as fair and anonymous voting, digital or otherwise. If you can't tie a person to their vote, you will never know if they sold their vote, at best you can limit the number of total votes. Bitcoin makes it very hard to tie a physical person to a digital identity, therefore makes it very easy to sell your vote.