A Simpler Bitcoin Voting Protocol

Abstract

Recently, Zhao and Chan proposed a Bitcoin voting protocol where n voters could fund Bitcoins to one of two candidates determined by majority voting. Their protocol preserves the privacy of individual ballot while they cast ballots by Bitcoin transactions. However, their protocol supports only two candidates and relies on a threshold signature scheme. We extend their method to produce a ballot by a voter selecting at least kmin, at most kmax from L candidates. We also redesign a vote casting protocol without threshold signatures to reduce transaction numbers and protocol complexities. We also introduce new polices to make the Bitcoin Voting protocol more fair.