Bitmain, a privately held Chinese company, controls an estimated 80% of the global market for cryptocurrency mining hardware. The application-specific integrated circuits it manufactures — the ASICs that power the overwhelming majority of Bitcoin mining operations worldwide — are physically present inside data centers scattered across the United States, operating at sustained high power loads, networked to the internet, and in many cases located in states with significant military or defense infrastructure. In November 2025, the Department of Homeland Security opened a formal investigation into whether Bitmain’s equipment can be remotely controlled for surveillance, espionage, or grid disruption purposes.

In December 2021, the United States held approximately 38% of the global Bitcoin mining hashrate, China held 21%, and Kazakhstan held 13%. By 2024, a Cambridge Centre for Alternative Finance survey covering roughly 48% of the Bitcoin network’s hashrate found that the United States accounted for 75.4% of reported power consumption among the top five countries, with Canada at 7.1%, Paraguay at 3.4%, Norway at 2.8%, and Kazakhstan at 2.6%. The redistribution was rapid and largely involuntary — driven by China’s 2021 ban on all cryptocurrency transactions rather than by any deliberate U.S. policy decision to absorb the activity.