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U.S. Sen. Elizabeth Warren (D-Mass.) is demanding to know how the Biden administration is doing in throttling the use of cryptocurrencies in the trafficking of fentanyl, according to a letter she and another lawmaker sent to the White House…

Stablecoins such as Tether’s USDT and Circle Internet Financial’s USDC, which are tokens tied to the value of the U.S. dollar, are a vital part of the crypto markets, used as steady means of transacting in other more volatile assets.…