“To be clear, we weren’t caught by law enforcement–so far at least, our experiment last month in ordering small amounts of marijuana from three different Bitcoin-based online black markets hasn’t resulted in anyone getting arrested. But a few weeks after those purchases, I asked Sarah Meiklejohn, a Bitcoin-focused computer science researcher at the University of California at San Diego, to put the privacy of our black market transactions to the test by tracing the digital breadcrumbs that Bitcoin leaves behind. The result of her analysis: On Silk Road, and possibly on smaller competitor markets, our online drug buys were visible to practically anyone who took the time to look.”
