The U.S. Treasury on Friday lifted economic sanctions against Tornado Cash, a firm that makes cryptocurrency transactions harder to track, which the Biden administration had accused of helping launder more than $7 billion for North Korean and other cyber hackers. The Treasury Department's Office of Foreign Assets Control blacklisted Tornado Cash in 2022 after concluding it was helping launder the proceeds of cyber crimes, including more than $455 million stolen by Lazarus, a North Korean government-backed hacking group. Six users of Tornado Cash - a cryptocurrency "mixer" that obscures the origins and recipients of transactions - had filed a lawsuit to challenge the sanctions with the financial backing of the Coinbase crypto exchange.