mining

The U.S. government's patience with Chinese crypto hardware on American soil is running thin - and Bitmain Technologies is now squarely in the crosshairs.

Key Takeaways
Senator Warren formally demanded Commerce Department records on Bitmain over espionage and power grid sabotage fears.A 2024 federal review flagged Bitmain hardware near U.S. military sites as a national security risk.Bitmain controls over 80% of the global Bitcoin mining hardware market - making any regulatory action a seismic event for the industry.The company is opening U.S. and Southeast Asian factories to outmaneuver tariffs and political pressure.
According to Bloomberg, Senator Elizabeth Warren sent a formal letter to Commerce Secretary Howard Lutnick this week, demanding documents related to how the department is handling what she calls "potential national security concerns" tied to Bitmain, the Beijing-based manufacturer that supplies the overwhelming majority of the world's Bitcoin mining rigs. The letter isn't a courtesy inquiry. It's a pressure campaign - and it lands on top of an already active federal investigation into whether Bitmain's machines could be leveraged for espionage or, worse, weaponized to disrupt the U.S. power grid.
This isn't Warren's first swing at the crypto industry, but it may be her most consequential.
The Actual Threat on the Table
The concern isn't theoretical. A May 2024 federal review specifically flagged Bitmain equipment deployed near sensitive U.S. military installations, raising what officials described as "significant national security concerns" about the potential for remote access by personnel based in China. Mining rigs - by design - are always-on, internet-connected machines drawing massive amounts of power. If that remote access is real and exploitable, the implications go well beyond lost Bitcoin.
The Department of Homeland Security has an active probe on this - internally dubbed Operation Red Sunset - examining whether Bitmain hardware could be used to conduct espionage or physically destabilize grid infrastructure. That kind of investigation doesn't get opened on a whim.
Bitmain, for its part, called reports of the federal probe "false news" and insisted it "strictly complies with U.S. and applicable laws." That's a standard denial, and it's unlikely to satisfy anyone in Washington right now.
Why Bitmain Is Impossible to Ignore
The scale of Bitmain's footprint is what makes this politically unavoidable. The company doesn't just participate in the Bitcoin mining hardware market - it dominates it, controlling upwards of 80% of global ASIC supply. Its mining pool, AntPool, currently accounts for roughly 18.3% of the entire Bitcoin network's hashrate. When American Bitcoin - a major U.S. mining operation - recently cut a $314 million deal to acquire 16,000 Bitmain rigs, it wasn't a business decision made in a vacuum. There simply isn't a meaningful alternative supplier at that scale.
That dependency is exactly what makes the national security argument complicated. Banning or severely restricting Bitmain hardware doesn't just inconvenience a few mining companies - it structurally destabilizes an industry that has become deeply embedded in U.S. energy markets and, increasingly, in AI infrastructure investment.
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Warren's office has previously documented just how embedded that energy footprint is. An investigation into seven large U.S. cryptomining operations found a combined capacity exceeding 1,045 megawatts - enough to power every residence in Houston. A separate study found that cryptomining in upstate New York alone pushed electricity bills up by roughly $165 million annually for small businesses and $79 million for individual ratepayers. The machines running most of that load are Bitmain machines.
The Political Layer Nobody Is Ignoring
Warren's letter did something notable beyond the national security framing - it asked pointed questions about whether Bitmain has had communications with members of the Trump family or with the Commerce Department under politically sensitive circumstances. She explicitly warned against "politically connected crypto interests" receiving preferential treatment.
That's a significant escalation. It reframes what could be a straightforward regulatory inquiry into something with a much sharper edge - suggesting that the concern isn't only about Chinese hardware on American soil, but about who in Washington might be running interference for it. Whether or not that allegation gains traction, it guarantees the story won't quietly disappear from the news cycle.
Bitmain's Next Move
What's worth noting is that Bitmain isn't behaving like a company expecting to be shut out of the American market. In fact, it's moving aggressively in the opposite direction.
The company is in the process of opening its first U.S. manufacturing facility - reportedly in Texas or Florida - with production expected to begin in 2026 and scale fully by year-end. The strategic logic is straightforward: a domestically manufactured product is a much harder target for national security restrictions than one shipped directly from China. It's also a hedge against the 25% tariffs currently making imports more expensive.
Simultaneously, Bitmain has opened assembly operations in Malaysia and Vietnam - a supply chain restructuring that mirrors what other Chinese tech manufacturers have been doing for years to keep products flowing into Western markets regardless of what happens to direct Chinese exports.
On the hardware side, the company is not coasting. Its 2026 lineup includes the Antminer S23 Hydro, which reaches an efficiency of 9.5 joules per terahash at 580 TH/s - a meaningful jump that directly targets the profitability squeeze miners are feeling as network difficulty climbs. The Antminer S21 XP is already shipping at scale. The company has also moved into AI server infrastructure, following a broader industry trend where major miners are repositioning themselves as AI data center operators.
None of this is the behavior of a company planning a quiet exit. Bitmain is digging in.
What Comes Next
The regulatory trajectory here is not hard to read. Warren is almost certain to continue pushing her Digital Asset Anti-Money Laundering Act, which targets loopholes that allow state actors - she specifically names North Korea and Iran - to use crypto infrastructure for sanctions evasion. New mandatory reporting requirements on energy usage and emissions, directed at mining operators and filed with the EPA and DOE, are increasingly likely.
The Commerce Department blacklisted Bitmain's AI affiliate, Sophgo Technologies, over alleged ties to Huawei - a move that signals the administration is willing to use existing trade enforcement tools against the Bitmain corporate family, even if direct action against the parent company remains politically complicated.
The core tension is this: the U.S. cannot easily replace Bitmain's hardware, but it also cannot indefinitely tolerate the national security exposure - real or perceived - that comes with Chinese-manufactured, always-on machines embedded across the American energy grid. Something has to give. Whether that's tighter oversight, mandatory hardware audits, accelerated domestic manufacturing incentives, or outright restrictions on Chinese-origin mining equipment, the window for the status quo is closing.
For the crypto industry, the next 12 months will likely define what operating in America actually looks like going forward. The era of regulatory ambiguity - Warren's "wild west" - appears to be ending, one letter to a cabinet secretary at a time.
Meanwhile, China Isn't Waiting
The Bitmain probe is one piece of a much larger picture. While Washington debates how much Chinese hardware is too much, Beijing has been quietly building something far more ambitious than a mining rig.
China's national "Chang'An Chain" initiative - formally known as ChainMaker - recently unveiled a domestically developed 96-core blockchain acceleration chip. The numbers are straightforward: smart contracts process 50 times faster than current standards, digital signature verification runs 20 times quicker, and on raw transaction throughput it matches Visa and Mastercard at peak load.
The more significant detail is what's underneath it. The chip runs on RISC-V - an open architecture that gives China complete domestic control with no foreign licensing dependencies. No external leverage points. It's part of what Beijing describes as its first fully homegrown blockchain software-hardware stack, and it's not a prototype - it's already operational across 16 central government ministries, 27 state-owned enterprises, and over 300,000 cross-border trade companies.
The U.S. is scrutinizing what Chinese hardware is doing inside its borders. China, meanwhile, is building the infrastructure to not need anyone else's.
#mining

MARA Holdings, the Bitcoin mining giant formerly known as Marathon Digital, just made its most consequential move in years: selling over 15,000 BTC in three weeks to clean up its balance sheet and accelerate a pivot into artificial intelligence infrastructure.

Key Takeaways
MARA Holdings sold 15,133 BTC for ~$1.1B to repurchase $1B in convertible debtThe company abandoned its HODL-only policy and is pivoting hard into AI infrastructureA 1 GW partnership with Starwood Digital puts MARA on a different path than MicroStrategyAcross the sector, Bitcoin miners are selling production and raising debt to fund AI pivots
According to a recent SEC filling, Between March 4 and March 25, 2026, the company offloaded 15,133 Bitcoin, pulling in roughly $1.1 billion in proceeds. The money went straight toward repurchasing $1 billion of its own 0% convertible senior notes - debt due in 2030 and 2031. Buying the notes back at a discount saves the company an estimated $88.1 million in cash and cuts its outstanding convertible debt by 30%.
The sale didn't happen in a vacuum. In early March, MARA revised its treasury policy to explicitly allow Bitcoin sales - a break from the HODL-first posture it had maintained on mined assets. That shift came on the heels of a brutal Q4 2025: a $1.7 billion net loss, driven largely by a $1.5 billion fair-value hit on its digital asset holdings.
Even after unloading that volume, MARA still holds over 38,689 BTC as of Q1 2026, keeping it among the largest public Bitcoin holders in the world. Wall Street's read is mixed - Clear Street cut its price target to $9, while the broader analyst consensus sits somewhere around a "Hold" or "Moderate Buy" with a median target in the $18.50–$20 range. Shares dropped 8.4% in early March following the strategy announcement, though the stock has since shown some divergence from Bitcoin's price movement - likely due to the AI infrastructure story gaining traction with certain investors.
The Starwood Deal And a Pivot to AI Infrastructure
The clearest signal of where MARA is headed is its joint venture with Starwood Capital Group through its platform Starwood Digital Ventures. The deal is structured around converting MARA's power-heavy mining sites into high-performance computing hubs capable of handling AI workloads.
Near-term targets call for 1 gigawatt of IT capacity, with a longer roadmap pointing past 2.5 GW. The sites will be built to toggle between Bitcoin mining and AI compute depending on which is more economical at any given time. MARA brings the power infrastructure and interconnection positions to the table; Starwood handles investment, design, construction, and tenant sourcing. MARA has the option to retain up to 50% ownership in the joint venture, giving it a potential stream of non-mining cash flow going forward.
The company's 64% stake in Exaion adds another layer to the play, positioning MARA to offer infrastructure-as-a-service and edge inference products to industrial clients.
The Rest of the Sector Is Moving the Same Direction
MARA isn't alone in this new venture outside of the crypto mining space. The shift from Bitcoin accumulation to AI infrastructure is visible across the mining industry.
Core Scientific sold its entire Bitcoin treasury - 2,537 BTC - in March 2026, then secured a $500 million loan from Morgan Stanley to fund AI data center construction. The company has moved aggressively toward hosting for CoreWeave, and analysts expect roughly 71% of its revenue to come from HPC and AI by end of year.
IREN, formerly Iris Energy, has essentially exited the Bitcoin reserve business and announced plans to raise $3.6 billion for AI expansion, targeting $3.4 billion in annualized revenue by 2026. It has deployed over 23,000 NVIDIA GPUs and secured an AI contract with Microsoft.
HIVE Digital Technologies is running a so-called "twin-engine" model - scaling HPC alongside mining - and recentlysigned $30 million in AI cloud contracts while expanding its renewable energy footprint across Paraguay, Canada, and Sweden.
TeraWulf has gone furthest in signaling an exit from mining. The company has signed over $12.8 billion in long-term AI customer contracts, and some analysts now expect it to shut down Bitcoin mining operations entirely by the end of 2026 to focus its 2.8 GW power capacity on AI demand.
CleanSpark sold 97% of its February Bitcoin production to fund an AI pivot and a Texas data center project. Riot Platforms posted a $663 million net loss in 2025 and is now under pressure from activist investor Starboard Value to accelerate $1.6 billion in AI data center investment. Bitfarms rebranded its infrastructure division as Keel Infrastructure and has laid out a full transition to AI and HPC by 2027.
Why Miners Are Struggling
The pivot makes more sense when you look at the economics. Mining costs for some operators have risen to an estimated $87,000 per Bitcoin. At the time of writing BTC is trading around $69,000 - significantly lower than the mining costs - meaning every block mined at current spot prices is a net loss. The post-halving environment has compressed margins, and the so-called "hashprice" - the daily revenue per unit of mining power - has fallen to levels that make pure-play mining increasingly hard to justify at scale.
The result is a structural shift: for the first time, production and accumulation have fully decoupled. Miners are now sellers of their own product to stay liquid, while firms like MicroStrategy absorb supply on the other side. That dynamic, combined with the capital intensity of AI infrastructure - GPU clusters, specialized cooling systems, Tier 3 data center standards - is also accelerating consolidation. CoreWeave's initial $9 billion bid for Core Scientific is an early example of what that M&A activity could look like.
What's Next
For MARA, the near-term question is execution. Deleveraging the balance sheet is straightforward enough; turning mining sites into competitive AI data centers - and finding enterprise tenants willing to commit - is harder. The Starwood partnership provides capital and expertise, but the AI infrastructure buildout timeline is long, and revenue from those operations won't arrive overnight.
The company still holds over 48,000 Bitcoin, so its fortunes remain tied to crypto markets in the interim. But the direction is clear: MARA is no longer betting exclusively on Bitcoin. Whether the AI bet pays off depends on how quickly it can fill that 1 GW pipeline and whether the broader enterprise demand for compute holds up long enough to matter.
#Mining