Treasury Dept. blacklists crypto platform used in money laundering.

The Treasury Department on Monday

Americans from using the cryptocurrency platform Tornado Cash, saying the service has helped criminals launder more than $7 billion of virtual currencies.

The crackdown was the U.S. government’s latest effort to rein in the crypto industry, as lawmakers and regulators grow increasingly concerned over the volatility of virtual currencies and their role in facilitating hacking and other crimes….