Silk Road founder's top lieutenant sentenced to 20 years for role in dark web drug market

Roger Thomas Clark served as security consultant and advisor to Silk Road founder Ross Ulbricht.
Clark played pivotal role in building and running Silk Road, the first dark web drug market.
He was involved in murder-for-hire plot against a Silk Road employee, though killing was faked.
Clark argued Silk Road reduced violence and sale of tainted drugs, but judge gave 20 year sentence.
Clark was extradited from Thailand and forfeited over $1.6 million in crime proceeds.