When bitcoin was first introduced, one of the concerns was that it was being used as a form of payment for questionable and/ or illegal transactions, such as those on the now-defunct marketplace Silk Road. The reason it was so popular for such transactions was because it provided an untraceable way to pay for items, but that seems to be changing. Researchers recently discovered that they were able to unmask some dark web users by linking them to bitcoin wallets that were used for transactions on the dark web. As a result, the anonymity once offered by bitcoin seems to...