A US court in Texas has issued a permanent ban on the Treasury Department's Office of Foreign Assets Control (OFAC) from re-sanctioning Tornado Cash, a decentralized cryptocurrency mixer. This ruling effectively prohibits the agency from enforcing sanctions on services related to Tornado Cash. This decision follows a previous US court of appeals ruling which deemed the initial sanctions on Tornado Cash as exceeding the Treasury Department's authority. The current ruling goes further by permanently preventing future sanctions. The lawsuit argued that all sanctions should be deemed illegal and invalidated, based on the previous court of appeals ruling. The Texas court agreed, stating that OFAC's sanctions on Tornado Cash are illegal and permanently prohibiting the agency from imposing them. This landmark decision has significant implications for the regulation of cryptocurrency mixers and the government's ability to sanction decentralized technologies. ```