Ross Ulbricht – who set up and ran online illegal drugs emporium Silk Road – has been sentenced in New York to life imprisonment.
Prosecutors said that his dark website sold more than $US200m of drugs anonymously.
He was found guilty of charges including conspiracy to commit drug trafficking – money laundering and computer hacking.
The site was shut down in 2013 after police arrested Ulbricht.
In February he was convicted by a federal court in New York of operating the site for nearly three years from 2011.
Users used the online currency Bitcoin to purchase drugs such as heroin – cocaine and LSD.
The untraceable deals earned him at least $18m.