Sotheby’s, the 277-year-old Brutish auction house, has revealed it’s accepting bitcoin ($BTC), ether ($ETH), and Tether’s $USDT stablecoin as payments for the sale of a rare 555.55-carat black diamond dubbed “The Enigma.” The diamond was declared the largest cut diamond in the world in the 2006 Guinness Book of World Records and was recently put […]