After years of running a darknet Bitcoin Mining firm, Helix, the 38-year-old individual from Akron, Ohio, Larry Dean Harmon, has pleaded guilty in the federal court for laundering money and cryptocurrency.Harmon needs to give up 4,400 bitcoin units worth more than $200 million to the state government. As part of the punishment, Harmon might be jailed for 20 years and fined $500,000 subject to a three-year term of supervisory release along with restitution payments.