Zerocoin has a ‘denial of service’ bug that allows for attackers to burn honest users’ coins. This fact has been known for almost two months now, but remains unfixed. The problem was first highlighted by Peter Todd in the aftermath of the Genesis Conference in London in February. As per Todd, while ZCoin could prove that attackers can’t steal coins, but they couldn’t prove that attackers can’t destroy the coins they don’t own. "A Tale of Zero Coins" #genesislondon TIL the original Zerocoin protocol is broken, even though it was "proven secure". They proved an attacker couldn't steal coins, but…
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