A little more than two years after the first Bitcoin transaction in January 2009, the digital currency passed a major milestone. It was on February 9, 2011, in fact, that Bitcoin first reached parity with the U.S. dollar on leading exchange MtGox – an achievement that arguably now marked it out as a legitimate force to be reckoned with in the worlds of international commerce and finance. In the following two years, moreover, the upward trend largely continued, culminating in the price of one Bitcoin rocketing to over $1,100 in late 2013. And while the cryptocurrency has suffered from market volatility since then, it’s worth noting that, in December 2017, a single Bitcoin became worth over $20,000. Anyone who invested in Bitcoin back in February 2009, then, may well now be sitting on a digital goldmine.
Source: http://www.businesspundit.com/history-of-cryptocurrency/