A foreign national from France, known on the dark net as OxyMonster, was sentenced to 20 years jail in the US for selling drugs such as fentanyl, online, and laundering the proceeds of crime. Gal Vallerius, 36, pleaded guilty to drug distribution and money laundering in Miami in June for selling cocaine, methamphetamine, fentanyl, oxycodone and other drugs on Dream Market where he was paid in Bitcoin.
Vallerius was arrested in August 2017, entering the US to attend a beard contest. In addition to selling illegal drugs online, he admitted to being an administrator of Dream Market. Part of the way he was detected was through his Twitter and Instagram accounts and by tracing his Bitcoin wallet addresses to Local Bitcoins.
Dream Market is a marketplace accessible on TOR, which has a tumbler service built in so that it is not possible to trace Bitcoin payments from buyer and seller.
He was arrested with 99.98 in Bitcoin and 121.98 in Bitcoin Cash under his control which was seized.