Cryptocurrency mining giants are once again thrust into the spotlight amid US investigations into Chinese hardware manufacturers. The focus is on Bitmain, the dominant player in Bitcoin ASIC manufacturing, which is now under federal scrutiny in the United States over national security concerns. This investigation raises questions about the geopolitical risks inherent in the global crypto infrastructure and could significantly impact the industry’s landscape.

Bitmain, China’s leading Bitcoin ASIC producer, faces an US security review over fears of remote control capabilities in its hardware.
The investigation, called “Operation Red Sunset,” is led by the US Department of Homeland Security and examines potential risks to US national security.
Authorities have previously scrutinized Bitmain for alleged links to Huawei and disrupted ASIC shipments to the US, raising ongoing concerns.
Bitmain controls over 80% of the Bitcoin mining ASIC market, with Chinese firms holding a combined 97% of the global share.
The investigation includes disassembly of ASICs to look for malicious features, though no findings have been publicly disclosed.

The United States has escalated its scrutiny of Chinese-based companies in the crypto space, with a focus on Bitmain, the world’s largest Bitcoin mining hardware manufacturer. According to a recent Bloomberg report, the Department of Homeland Security is investigating whether Bitmain’s ASICs could be exploited remotely for espionage or to sabotage critical US infrastructure. Known as “Operation Red Sunset,” the inquiry is part of broader efforts to secure American technological assets amid rising geopolitical tensions.

Previously, US authorities examined links between Bitmain-linked chip designer Xiamen Sophgo and Huawei, a Chinese tech giant under US sanctions. In October 2024, US Customs and Border Protection temporarily halted the shipment of thousands of Bitmain ASIC units, only resuming deliveries this past March. Investigators reportedly disassembled some ASICs during their probe, seeking evidence of malicious functionalities. However, specific findings remain undisclosed.

A Bitmain spokesperson refuted allegations of malicious control, asserting that the company “strictly complies with US and applicable laws,” and denied any involvement in activities threatening national security. The spokesperson emphasized that the company is unaware of any ongoing investigation and categorically dismisses the claims.

Implications for US Crypto Mining Industry

Bitmain’s dominant position in the crypto mining industry—over 80% of the market—means that any restrictions or disruptions could have far-reaching consequences. Chinese companies, including MicroBT, control approximately 97% of the global market share for Bitcoin ASICs, underscoring China’s leadership in the sector.

Mining hardware distribution by manufacturer chart. Source: Cambridge Digital Mining Industry

The US industry could experience disruptions as authorities investigate whether malicious capabilities are embedded within hardware that is vital for Bitcoin’s security infrastructure. Some ASICs have already been subjected to disassembly, but whether any malicious features have been uncovered remains unconfirmed. Bitmain has publicly denied any malicious intent, asserting its compliance with legal standards and emphasizing its innocence in the ongoing investigation.

Political and Industry Ramifications

The inquiry intersects with broader concerns about the security of American crypto infrastructure, especially given the involvement of US-based firms like American Bitcoin, which ordered over 16,000 Bitmain miners and inherited substantial ASIC holdings. Industry experts warn that these investigations could lead to delays in hardware shipments and increased regulatory scrutiny, further complicating US-China trade tensions within the cryptocurrency sector.

As the investigation develops, the stability of the global crypto mining industry remains uncertain. The outcome could reshape supply chains, influence hardware deployment, and heighten regulatory vigilance—factors crucial to the ongoing health and security of blockchain networks worldwide.