2017 was the year of bitcoin fever. He started the year by trading below $ 1,000, and concluded it almost at historic highs close to $ 20,000. But in 2018 the bubble exploded and fell to just over $ 3,000. After catching air, this year the main cryptocurrency returns to the old ways and doubles its value in what we have been in 2019. Thus, the cryptocurrency has touched on Monday the $ 8,000 to change, more than double the $ 3,817 in which ended last year. Last week barely exceeded 6,000. Only in the day today, at 20.00 (Spanish peninsular time) was revalued 14.5% compared to Sunday. Part of today's rise comes motivated by the acceptance of the US network Whole Foods - bought by Amazon a few months ago - and Nordstrom accept the use of bitcoin for payment thanks to an agreement with the Flexa payment platform. This is a small step towards silencing criticism that cryptocurrency is used almost exclusively as an investment and to speculate, but not as a currency for commercial transactions between individuals. In this sense, several experts believe that the bitcoin will collapse when the cost of 'mining' the coins exceeds the value of the same, which is increasingly likely that the algorithms to solve to get bitcoin mines are increasingly more complex and require more computing resources. Nevertheless, volatility remains a problem for daily use. That a user can acquire, with the same amount of bitcoins in his wallet, 15% more products today than yesterday is not useful for users to have a clear notion of their purchasing power in bitcoins. Another part of the increases of the last days are the movements of the 'whales', as it is known to the big holders of bitcoins. Only one of them has moved the equivalent of 343 million dollars in bitcoins during this weekend.