Jimmy Zhong appeared to have pulled off the perfect crime. In December 2012, he stumbled upon a software bug that allowed him to steal 50,000 bitcoins from a site on the dark web called the Silk Road. WSJ’s Robert McMillan explains how Zhong’s stolen crypto stayed hidden until investigators developed better ways to track down crypto criminals.  Further Reading: - The U.S. Cracked a $3.4 Billion Crypto Heist — and Bitcoin’s Anonymity  Further Listening: - How The Government Tied One Couple to Billions in Stolen Bitcoin  Learn more about your ad choices. Visit megaphone.fm/adchoices