During her confirmation hearing, the Treasury nominee said that blockchain-based financial networks are “a particular concern. CRYPTOCURRENCIES COULD COME under renewed regulatory scrutiny over the next four years if Janet Yellen, Joe Biden's pick to lead the Treasury Department, gets her way. During Yellen's confirmation hearing on Tuesday before the Senate Finance Committee, Senator Maggie Hassan (D-New Hampshire) asked Yellen about the use of cryptocurrency by terrorists and other criminals. "Cryptocurrencies are a particular concern," Yellen responded. "I think many are used—at least in a transactions sense—mainly for illicit financing." She said she wanted to "examine ways in which we can curtail their use and make sure that [money laundering] doesn't occur through those channels." Blockchain-based financial networks are attractive to criminals because they do not require users to identify themselves—as the law requires most conventi...