Larry Dean Harmon, the Helix and Coin Ninja crypto-tumbling chief who in February was arrested for allegedly mixing bitcoin for criminals must pay $60 million in civil penalties, prosecutors at the Financial Crimes Enforcement Network (FinCEN) demanded Monday.

• Harmon's bitcoin mixing services allegedly laundered tens of millions of dollars in crypto for darknet markets including Abraxas, Agora, Hansa, Hydra, and Wall Street Market.
• Defunct former darknet giant AlphaBay is alleged to have forged particularly close ties to Helix. Prosecutors claim that Helix laundered $27 million in bitcoin for AlphaBay by integrating its mixing services on-site.
• Harmon's family has denied that Larry had any ties to AlphaBay.
• Prosecutors allege that Harmon was running an unregistered money services business in violation of the Banking Secrecy Act. They say he had a responsibility to file suspicious activity reports and systemically flouted U.S. money laundering laws.
• FinCEN hailed its penalty as the "first" action against a bitcoin mixer.
• Harmon's case is notable because it is the first time the U.S. Department of Justice explicitly called bitcoin mixing a "crime." Such a classification could spell far-reaching legal troubles for any service that uses obfuscation tactics to conceal bitcoin's publicly accessible path.
• Harmon also faces criminal proceedings in U.S. federal court.