Crime isn’t supposed to pay, but sometimes the wages of sin are paid in bitcoin. Last week, Japanese police reported that 2018 saw a tenfold increase of cryptocurrency money laundering. In 2017, Japan’s National Police Agency discovered fewer than 700 instances of crypto money laundering. Last year, they found more than 7,000 cases. What is it about this new asset class, which is enabled by blockchain distributed ledger technology, that makes it so appealing to criminals? And what can be done to keep cryptocurrency clean?