An anonymous reader writes: A typo in the Zerocoin source code allowed an attacker to steal 370,000 Zerocoin, which is about $592,000 at today's price. According to the Zcoin team, one extra character left inside Zerocoin's source code was the cause of the bug. The hacker exploited the bugs for weeks, by initiating a transaction and receiving the money many times over.
According to the Zcoin team, the attacker (or attackers) was very sophisticated and took great care to hide his tracks. They say the attacker created numerous accounts at Zerocoin exchanges and spread transactions across several weeks so that traders wouldn't notice the uneven transactions volume. The Zcoin team says they worked with various exchanges to attempt and identify the attacker but to no avail.
Out of the 370,000 Zerocoin he stole, the attacker has already sold 350,000. The Zcoin team estimates the attacker made a net profit of 410 Bitcoin ($437,000).