最新报道:Chinese Bitcoin mining firms like Bitmain and Canaan, dominating over 90% of global mining hardware production, are expanding U.S. operations amid tariff tensions, boosting the U.S. share of global hashrate from 4% in 2019 to 38% in 2025. However, their growth triggers national security concerns, prompting CFIUS reviews and regulatory scrutiny over energy use, foreign-state ties, and non-domestic chips in critical infrastructure. The U.S. holds 207,189 BTC ($17 billion) in its Digital Asset Stockpile, while strategic frameworks address risks from cross-border dependencies and cybersecurity vulnerabilities.