Bitcoin is the very first decentralized virtual currency that uses cryptography for security. Bitcoin is not linked to any fiat currencies or real assets — BTC value is regulated only by demand and supply factors. Bitcoin is a global payment system which allows to conduct Bitcoin transactions. Its key distinction from classic payment systems is that Bitcoin system has neither processing center nor Manager— all transactions are conducted solely online amid network users on an equal basis. The cryptocurrency blockchain was launched in 2009 (its development started in 2007), by a computer programmer or a group of programmers known by the alias Satoshi Nakamoto. The Bitcoin Network's source code was published in 2009 that marked Bitcoin start time.