Last week, the FBI announced that it had shut down Silk Road. Silk Road was the Craigslist of illegal stuff, mainly illegal drugs. (For more about Silk Road, see Laura Dimon’s excellent article published last August.) The FBI also arrested the alleged administrator and owner of Silk Road, who went by the online moniker “Dread Pirate Roberts” or “DPR” for short. Given the inherent anonymity of Silk Road, positively identifying DPR was bound to be difficult. Indeed, the FBI devoted nine pages of its complaint to setting out the evidence that supposedly identifies DPR as San Francisco resident Ross William Ulbricht.