Nigeria follows Chinas footsteps in piloting digital currency Central banks control the circulation and supply of money globally, but the phenomenal rise of cryptocurrency poses a threat to those central banks’ authority, control and power. So a wave of central banks around the world are now producing their own digital currencies. In a groundbreaking move for the African continent, buffered by local activity and interest in cryptocurrency — after the U.S., it is the second-largest market for crypto trading — Nigeria joins that list this week. After being in the development phase for the last three years, its central bank...