China Bans Mining: The Great Migration
China hosted 65% of Bitcoin's hashrate. Then the government banned mining overnight. Half the network disappeared. Miners packed trucks and fled to Texas, Kazakhstan, and anywhere with cheap power.
In May 2021, China's State Council announced a crackdown on Bitcoin mining and trading. By June, provinces began enforcing shutdown orders. Within weeks, over half of Bitcoin's global hashrate vanished. Millions of mining rigs went dark. The largest forced migration of computing infrastructure in history had begun.
China had been Bitcoin mining's heartland for years. Cheap hydropower in Sichuan during wet season, cheap coal in Xinjiang and Inner Mongolia during dry season. By early 2021, Chinese miners controlled approximately 65% of global hashrate. Bitcoin's decentralized network was, in practice, heavily concentrated in a single authoritarian country. The irony was lost on nobody.
The ban was not sudden in hindsight. China had been tightening the screws for years. But the speed of enforcement in 2021 was unprecedented. Sichuan ordered all mining operations shut by June 20. Inner Mongolia, Xinjiang, Qinghai, and Yunnan followed. Power companies were ordered to cut electricity to mining facilities immediately. Some miners had hours to unplug.
The exodus was chaotic. Miners who could afford it shipped container loads of ASICs to the United States, Kazakhstan, Russia, and Canada. Texas became the top destination thanks to cheap energy and friendly regulators. Riot Platforms, Marathon Digital, and other US-listed miners expanded rapidly. Kazakhstan absorbed a flood of Chinese miners and briefly became the world's second-largest mining hub before its own grid started buckling under the load.
Bitcoin's hashrate fell roughly 50% between May and July 2021. The network adjusted automatically - difficulty dropped, block times normalized, and mining became temporarily more profitable for everyone still running. By December 2021, hashrate had fully recovered and exceeded pre-ban levels. Bitcoin did exactly what it was designed to do: survive the loss of its largest participant without skipping a beat.
The geographic redistribution was permanent. The US went from roughly 17% of hashrate in 2020 to over 40% by 2022. Bitcoin mining became a real industry in America with publicly listed companies, institutional investment, and political lobbyists. China's ban was intended to kill Bitcoin. Instead it Americanized it.
The Aftermath
China's share of Bitcoin hashrate went from 65% to near zero. The US rose to 40%+ of global hashrate. Bitcoin mining became a legitimate American industry with NYSE-listed companies. The network recovered in 6 months. China's ban achieved the opposite of its intent.
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