Bitcoin miner Antminer-s9 is most efficient. This method was first used in 2009 by Satoshi Nakamoto. In this method you compete with others to earn more bitcoins. It has a mining rate of 14 TH/s.The Antminer-s9 generates 1.6 bitcoins monthly. It is a very fast process.
http://www.antminer-s9.com/
