The rollout of digital yuan during the approaching Winter Olympics in Beijing will enable foreign athletes and spectators to use the digital currency for the first time. Visitors will be able to download an app or receive a physical card storing digital yuan, according to the Bank of China Ltd. They will also be able to exchange it with foreign bank notes at self-service machines, said the state lender and official partner of the games. Meanwhile, certain athletes and their coaches could be eligible for wristbands, which would act as e-wallets and merely have to be swiped to pay for...