The U.S. Department of Justice has taken legal title to more than $400 million in seized cryptocurrency, real estate and cash tied to Helix, a once-popular darknet bitcoin mixing service, the agency announced on Thursday.
Mixers like Helix are built to obscure the origin and destination of crypto transactions by pooling and redistributing funds—a feature that has long drawn scrutiny from law enforcement and regulators. According to DOJ court filings, Helix became one of the most widely used mixers on the darknet, especially by online drug sellers looking to launder illicit proceeds.
Investigators say Helix processed at least 354,468 bitcoin—valued at roughly $300 million at the time—much of it connected to darknet drug markets. The DOJ alleges Helix’s operator, Larry Dean Harmon, earned commissions and fees from those transactions and enabled large-scale money laundering through the service’s infrastructure.
Harmon pleaded guilty in August 2021 to conspiracy to commit money laundering. In November 2024 he was sentenced to 36 months in prison, followed by three years of supervised release, and was hit with a forfeiture money judgment along with the forfeiture of seized assets. Harmon also ran Grams, a darknet search engine, and Helix offered an API that allowed darknet marketplaces to integrate the mixer directly into bitcoin withdrawal systems—streamlining the laundering process for users.
The seizure is part of a broader push by the DOJ’s Criminal Division. Since 2020, the Computer Crime and Intellectual Property Section (CCIPS) says it has secured more than 180 cybercrime convictions and won court orders returning over $350 million to victims.
This action underscores continued law enforcement focus on services that facilitate the conversion and concealment of criminal proceeds in crypto, and signals that authorities are intensifying efforts to disrupt the infrastructure that fuels darknet markets.
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