What is the origin of Bitcoin and how many crypto currencies are there?

The creation of the first virtual currency dates from 2009
Bitcoin was born in 2009. Its inventor wanted to create a fully peer-to-peer electronic money system that allows online payments to be made directly from one third to another without going through a financial institution.
This project has been emulated since there are several hundred competing virtual currencies or not.
Constant increase in cryptocurrency since early 2017
This Wednesday, December 13, Bitcoin has reached a peak of $ 17000 and its value continues to increase since early 2017. (Since the shooting of the video three weeks ago, the value of bitcoin has simply doubled).
The total valuation of cryptocurrencies exceeds 350 billion dollars, it has been multiplied by 30 for 24 months.
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