Bitcoin, any central bank, official organization, etc. is a non-electronic currency. Symbol: Semb. It can be divided into units up to 100-millionth step after a comma. It is also the currency of the Bitcoin Deep Web. Bitcoin network was launched on 3 January 2009. The author of the manifesto is Satoshi Nakamoto, but probably not his real name. Maximum number of bitcoins is limited to 21 million. As of July 22, 2013, the total value of the circulating Bitcoins was 1.2 billion dollars and as of June 4, 2014, this value reached USD 8.2 billion.