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This work is focused on the recently-implemented digital currency of Bit-coin, since the first appearance of the idea of a fully decentralized encrypted payment system in 1982 by David Lee Chaum, until its successful implementation in 2008 by a group of developers whose identity is concealed, aside the pseudonym Satoshi Nakamoto, to date. Based on a large number of bibliographic and news articles in order to follow its course and impact, I will refer to the idea of bitcoin and its post-successful implementation. The following paper describes the nature of the digital coin of bit-coin and how it can be used. The following chapters will analyze the methods and criteria for acquiring the digital currency, the way in which transactions are completed, the underlying and threatening risks but also personal security proposals, and finally its impact on the world and the rate at which it is adopted by more and more users.