The largest cryptocurrency exchange in the world can trace its origins to a dimly lit hot pot restaurant on the southern edge of Chengdu. It was June 2017, and Chandler Guo, an early Chinese cryptocurrency mogul who made his fortune mining Bitcoin, was hosting a wedding anniversary party for his wife. Guo remembers it as a raucous event — beer was flowing, and guests spilled out onto the sidewalk, where the restaurant had to set up extra tables and chairs. “All the big people in the Chinese