OKCoin exchange, one of the worldโs largest digital asset exchanges, launched its fiat-to-crypto trading services in the U.S. today. The company had filed for a MSB registration with the U.S. FinCEN back in the fall. For now, the exchange is only servicing Californian residents, with plans to further expand services in the U.S. The U.S. expansion follows on the heels of OKEx's commitment to Malta, signifying OK's aggressive global expansion.