A U.S. Republican lawmaker is urging the Treasury Department to investigate Bitmain and Cango, citing national security concerns related to opaque ownership and potential foreign government ties.

Executive Summary

Republican lawmaker Zachary Nunn has requested the Treasury Department to investigate Bitmain and its Bitcoin mining affiliate Cango due to national security concerns. The request centers on opaque ownership structures, financing arrangements, and potential ties to foreign government actors. This development introduces regulatory uncertainty and bearish sentiment for both companies.

The Event in Detail

Representative Zachary Nunn of Iowa, a member of the House Select Committee on the Chinese Communist Party, sent a letter to Treasury Secretary Scott Bessent requesting a CFIUS investigation into Bitmain and Cango. Nunn cited risks related to Cango's energy usage, potential affiliations with foreign governments, and concerns over surveillance using foreign-made chips. He also noted that Bitmain controls over 80% of the global Bitcoin mining hardware market.

Cango, formerly an auto services platform, has recently pivoted to Bitcoin mining and become a top five player, producing 664 BTC in August, surpassing CleanSpark and becoming the third-largest miner after MARA and IREN. Cango's entry into mining was financed by Antalpha, Bitmain's financial arm, which has become its majority owner, effectively making Cango a mining proxy for Bitmain.

Market Implications

The investigation request could negatively impact Bitmain and Cango's operations and valuations. The potential for increased regulatory scrutiny introduces uncertainty for investors. CFIUS has previously blocked Chinese firms from acquiring or operating sensitive infrastructure, as seen in the case of a crypto mining facility near a strategic Air Force base in Wyoming.

Expert Commentary

Nunn stated that Bitmain and Cango "appear to be scaling operations in the U.S. through complex ownership structures and financing arrangements that may not be fully transparent to regulators or the public." He insisted a review is necessary to protect “American energy, digital asset markets, and financial sovereignty.”

Broader Context

The request for investigation arrives shortly after American Bitcoin Corp purchased over $300 million in mining machines from Bitmain's U.S. subsidiary. Major Chinese manufacturers like Bitmain, Canaan, and MicroBT have shifted production to the U.S. to avoid tariffs, increasing America's share of Bitcoin's hashrate from 4% in 2019 to 38% today. This trend highlights the growing presence of Chinese-linked entities in the U.S. Bitcoin mining sector and the increasing regulatory scrutiny they face.