When Yi He was a girl in the 1980s, she walked to the well for water and relied on kerosene lamps at times to light the house. Things are different now. Today, Yi He is a celebrity to millions of Chinese and a multibillionaire thanks to her reported 10% stake in the world’s largest cryptocurrency exchange, Binance, where she wields enormous influence as a cofounder and senior executive. Still, life has not been easy. Binance’s other cofounder, the flamboyant Changpeng Zhao, went to prison last y...