U.S. officials have spent months investigating whether Bitcoin-mining machines made by Beijing-based Bitmain Technologies pose espionage or sabotage risks, according to people familiar with the probe.
Bitmain supplies most of the world's mining rigs, including 16,000 units sold to a project backed by two of President Donald Trump's sons.
A federal review last year flagged "significant national security concerns" after Bitmain equipment was deployed near a U.S. military base, Bloomberg reported Saturday.
In July, the Senate Intelligence Committee warned the company's devices could be remotely manipulated from China and contain "disturbing vulnerabilities."
Bitmain denies any security risk.
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