[sly010]

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.

[throwaway2016a]

They can sell there vote not, they just need to show up to the polls in order to do it.