The U.S. government has opened a sweeping national security investigation into Bitmain Technologies, China’s largest manufacturer of Bitcoin-mining machines, according to a Bloomberg report dated November 21, 2025. The probe, internally codenamed “Operation Red Sunset,” is being led by the Department of Homeland Security and focuses on whether Bitmain hardware poses espionage or infrastructure-sabotage risks inside the United States.
Fears of Remote Access and Espionage
Investigators are examining whether Bitmain’s mining rigs could be remotely controlled from China, potentially allowing manipulation of machines deployed on U.S. soil. These concerns trace back to a July 2025 Senate Intelligence Committee report warning of “disturbing vulnerabilities” in Bitmain devices and suggesting they could serve as vectors for cyber intrusions.
Proximity to Critical U.S. Infrastructure
National security worries intensified after U.S. officials identified Bitmain hardware running near power plants, military installations, and grid-adjacent facilities. In one flagged incident last year, a federal review found security risks tied to Bitmain miners operating close to a U.S. military base, prompting deeper scrutiny from homeland security officials.
Hardware Seizures and Technical Inspections
As part of the investigation, federal agencies detained Bitmain shipments at U.S. ports, disassembling machines to examine chips, firmware, and networking components for malicious capabilities. Investigators are checking whether any embedded backdoors, covert communications features, or remote-execution modules exist.
Bitmain Denies Allegations
Bitmain has pushed back forcefully, stating it cannot remotely access its machines and fully complies with U.S. regulations. The company said it was unaware of “Operation Red Sunset” and attributed past hardware detentions to routine Federal Communications Commission compliance checks, not national security concerns.
Spotlight on Trump-Linked Mining Venture
The probe has also drawn political attention because American Bitcoin, a mining company backed by President Trump’s sons, recently purchased 16,000 Bitmain rigs for $314 million. A spokesperson said the firm conducted its own cybersecurity tests and found “no vulnerabilities.”
Part of a Wider U.S. Crackdown on Chinese Tech
“Operation Red Sunset” fits into a broader U.S. strategy to scrutinize Chinese technology in sensitive sectors:
- In May 2024, the Biden administration forced a Chinese mining firm to divest from a site near a U.S. military base.
- In January 2025, the Commerce Department blacklisted Sophgo Technologies, Bitmain’s AI affiliate.
- Multiple bipartisan committees have warned of foreign-manufactured hardware embedded in critical U.S. systems.
Investigation Still Ongoing
Officials declined to comment on the current status or timeline of the probe. What is clear is that the investigation spans both the final Biden years and the early Trump administration, underscoring bipartisan concern over Chinese technology inside America’s digital and physical infrastructure.
The outcome of “Operation Red Sunset” could have far-reaching implications for the crypto-mining industry, U.S.–China tech relations, and the future of hardware security standards across digital asset infrastructure.
