What is Bitcoin?
Bitcoin - 1st cryptocurrency, laid the foundation of digital currencies’ idea, working on cryptographic methods. Its “father” and implementer (with the blockchain’s one) is Satoshi Nakamoto (nobody knows about his identity or can be confident in his existence). At its start (March 2010) bitcoin cost $0.003. The world starts using bitcoin seriously: as Nikkei noted, ~40% of bitcoin trade in Japan within the last 4 months of 2017 was paired with the yen.