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In August 2022, the U.S. Treasury Department’s Office of Foreign Assets Control (OFAC) sanctioned Tornado Cash, a decentralized cryptocurrency mixing service on the Ethereum blockchain. The service, which enhances transaction privacy by obfuscating the origin of funds, was accused of facilitating money laundering, including over $7 billion in cryptocurrency, some linked to North Korean cyberattacks. OFAC added Tornado Cash to its Specially Designated Nationals list, prohibiting U.S. persons from interacting with it. The sanctions sparked controversy, raising concerns about privacy, open-source software, and regulatory overreach. Critics argued it unfairly targeted a neutral tool, while supporters emphasized the need to combat illicit finance.