The U.S. Treasury Department is stepping up its scrutiny of crypto firms that may be enabling terrorist financing. This follows the revelation that digital currencies, such as Bitcoin (CRYPTO: BTC) and Ethereum (CRYPTO: ETH), may have been used to fund Hamas’s recent attack on Israel. U.S. Deputy Treasury Secretary Wally Adeyemo is scheduled to make a speech on Friday, warning these firms about their potential involvement in supporting terrorist organizations, reported The Washington Post. The address will be at London’s Royal United Services Institute, a foreign-policy think tank. Adeyemo’s w…