The United States has for the first time banned the usage of a smart contract running on the ethereum network called Tornado Cash.

The zk tech based mixer, which hides asset ownership identity, was used to launder $7 billion the US Treasury said, including “over $455 million stolen by the Lazarus Group, a Democratic People’s Republic of Korea (DPRK) state-sponsored hacking group that was sanctioned by the U.S. in 2019.”