T he United States has supplanted China as the world’s largest center for Bitcoin mining after Beijing announced that the practice would be forbidden. The U.S. now accounts for more than 35% of the global share of Bitcoin mining, a figure far higher than just a year ago, when it accounted for just 4.2%, according to research published on Wednesday by Britain’s Cambridge Centre for Alternative Finance. Kazakhstan is now the world’s second-largest source of Bitcoin mining, followed by Russia. Bitcoin mined in China had previously dominated the global supply. The country accounted for nearly 67% of Bitcoin mining worldwide...