Another issue: This looks like a one round system, which means people who vote after the blind period are shut out from participating, especially if the blinding period is short. If the blinding period is long, then vote results won't be available for ranking or display for a long time. Both of these are bad for usability and user engagement. I prefer the attribute of the current system where even late votes still "count", although they may not numerically count for much (casual users are probably more influenced by the former). Add multiple rounds? Well, I'll not go there.