Bitmain, a leading Chinese supplier of Bitcoin mining equipment, is under a US federal investigation focusing on national security concerns. The months-long probe follows warnings raised in 2024 about the operation of its mining devices near US military bases and potential remote control capabilities from China. Authorities are assessing whether the equipment could enable espionage or disrupt power grids, amid broader US-China technology tensions. Bitmain has rejected the allegations, stating its products cannot be remotely controlled and comply with US regulations.