Kraken, one of the world’s largest cryptocurrency exchanges, is under federal investigation, suspected of violating U.S. sanctions by allowing users in Iran and elsewhere to buy and sell digital tokens, according to five people affiliated with the company or with knowledge of the inquiry. The Treasury Department’s Office of ForeignContinue Reading

Seven of the largest Bitcoin mining companies in the United States are set up to use nearly as much electricity as the homes in Houston, according to data disclosed Friday as part of an investigation by congressional Democrats who say miners should be required to report their energy use. TheContinue Reading

SEOUL — Two South Koreans have been arrested on charges of stealing military secrets on behalf of a suspected North Korean spy agent who paid them in cryptocurrency, the police said on Thursday. A 38-year-old executive at a cyber-currency company met the agent through an online cryptocurrency community six yearsContinue Reading

But Peter Singer, a professor at the Center on the Future of War at Arizona State University, said Mr. Fedorov had been “incredibly effective” in calling for companies to rethink their Russia connections. “No celebrity, let alone nation, has ever been more effective than Ukraine at calling out corporate brandsContinue Reading

MOSCOW — When cybersleuths traced the millions of dollars American companies, hospitals and city governments have paid to online extortionists in ransom money, they made a telling discovery: At least some of it passed through one of the most prestigious business addresses in Moscow. The Biden administration has also zeroedContinue Reading