There are quite a few permutations on liquid democracy, some of which stake out different points on openness vs. susceptibility to vote buying. For example, yo

There are quite a few permutations on liquid democracy, some of which stake out different points on openness vs. susceptibility to vote buying. For example, you could have only people who have delegates have open votes, while those that don't have anyone delegated to them can vote or delegate secretly. This isn't much worse than our current delegative system, which admittedly does have an issue with vote-buying!