That's according to Time, which in detailing the U.S. law enforcement take down of Silk Road, where users could buy everything from marijuana to heroin, noted the FBI seized approximately $3.6 million (about £2.2m, AU$3.8m) in Bitcoin.
That's quite a haul, but not the biggest - Mt. Gox, a Bitcoin exchange business, reportedly had more than $5 million (about £3m, AU$5.3m) seized by the U.S. government.
Does crime pay? In Bitcoins it seems.
- We have compiled a list of the best bitcoin exchanges