Key Highlights DOJ seizes $400M tied to Helix, a crypto mixer that laundered $300M from darknet markets between 2014–2017. Helix hid Bitcoin trails, helped major hacks and darknet sales, showing how mixers fuel crypto crime globally. DOJ, FBI, and IRS work with Belize highlights strong intl. effort against crypto laundering and illicit funds. The U.S. Department of Justice (DOJ) has forfeited over $400 million in cryptocurrencies, real estate, and monetary assets tied to the notorious darknet mixing service, Helix. Announced last week, this operation marks one of the largest counter-efforts against money laundering using cryptocurrencies. As per the DOJ release , Helix hid where coins came from and where they went, moving over $300 million in illegal funds between 2014 and 2017. The platform was run by Larry Dean Harmon, who pleaded guilty to a conspiracy to commit money laundering in August 2021. In November 2024, he was sentenced to three years in prison, three years of supervised release, and his assets were seized. On January 21, a judge formally gave the government ownership of the assets, finalizing the DOJ’s claim. Helix’s role in darknet money laundering Helix was a key tool for cleaning money from illegal online drug sales. It mixed cryptocurrency from many users, making it very hard to trace. Court records show Helix processed transactions of about 354,468 Bitcoin (BTC)—worth around $300 million back then—much of it moving through major darknet markets. Harmon took a cut as fees, earning money from these illegal transactions. Harmon also connected Helix to Grams, a search engine for the darknet, and made it easy for markets to automatically move Bitcoin. Investigators traced tens of millions of dollars through Helix, showing how important it was to illegal online operations. Officials from the DOJ, Federal Bureau of Investigation (FBI), and Internal Revenue Service (IRS) emphasized the teamwork involved in taking down the platform. The government also worked with authorities in Belize, showing strong international cooperation. Broader context of crypto mixers and sanctions The Helix case is an example of a broader crackdown on crypto mixers. The Treasury has in the past sanctioned Tornado Cash for facilitating the movement of billions of dollars in illegal transactions. However, the sanctions on Tornado Cash were removed in 2025 due to legal and policy challenges. Other crypto mixers, like Blender, have also been sanctioned for helping launder money from hacks. For example, the North Korean-backed Lazarus Group used Blender to move over $20.5 million stolen from the Ronin Network. The DOJ records show Helix helped launder more than $455 million in Lazarus Group funds, $96 million from the Harmony Bridge hack, and at least $7.8 million from the Nomad hack. Similar cases and industry impact Not just Helix, but the team behind Samourai Wallet also went to prison for helping criminals hide $237 million in stolen funds. Its CTO William Lonergan Hill got four years , while CEO Keonne Rodriguez got five. They also had to give up millions. As seen, these are just some of the cases where the authorities are cracking down hard on crypto mixers in order to stop money laundering and help the victims of hacks and online scams. The seizure of the DOJ is evidence that authorities are monitoring crypto mixers more closely than ever. As people are trying to launder money using digital currencies, authorities all over the world are working together to protect the financial system. Also Read: Midnight Takes Privacy Off the Internet With Satellite Messaging