According to BlockBeats, the U.S. Customs and Border Protection (CBP) has increased its efforts to seize Bitcoin ASIC mining machines. In addition to Bitmain, devices from MicroBT and Canaan have also been added to the seizure list. Last year, CBP confiscated Bitmain Antminer S21 and T21 miners, reportedly due to the inclusion of restricted AI chips from the chip manufacturer Sophgo. The current seizures are based on the regulation 19 USC 1595a(c)(2)(A), which pertains to unauthorized communication devices and equipment lacking FCC certification.