In bitcoin trading, bitcoin exchanges, who own bitcoin mining machines, allow everyone to invest in bitcoin and in returns they charge you a small or reasonable fee. (ilainfo.com)
However, Chinese companies now control the bulk of the world's most powerful, industrial - sized bitcoin mining machines. (ibtimes.com)
John McAfee, an American computer programmer and creator of the (notoriously) popular antivirus software, has led his Bitcoin company MGT Capital to launch its first bank of Bitcoin mining machines. (coinfox.info)