How Trump’s disruption of the crypto supply chain could be a security risk for the U.S.

The world’s three best-selling makers of bitcoin mining machines—all of Chinese origin—are setting up manufacturing footholds in the United States as President Donald Trump’s tariff war reshapes the cryptocurrency supply chain.

Bitmain, Canaan, and MicroBT build over 90% of global mining rigs—essentially computers dedicated to number-crunching that produces bitcoin. Establishing U.S. bases could shield them from tariffs but risks stoking security concerns the U.S. has with China in areas...