OFAC sanctions the mixer Tornado Cash (2022)
The US Treasury's Office of Foreign Assets Control blacklisted Tornado Cash, a tool that mixes crypto to hide its trail, saying North Korea's Lazarus Group used it to launder over $455 million. It was the first time the US sanctioned software rather than a person or firm.
Major exchanges and infrastructure providers cut off the tool within days, and a developer was arrested in the Netherlands.
A US court later found Treasury overstepped by sanctioning immutable code, narrowing how far authorities can reach into open protocols.
It showed the limits regulators hit when they target crypto infrastructure directly, the same challenge the EU faces with offshore platforms it cannot license or seize.
