We already know without complex diagrams that within a year, the price of bitcoin, after halving the remuneration of miners, should increase many times. This effect will increase significantly if we enter a period of severe global economic crisis. Therefore, we must systematically prepare for the growth of the cryptocurrency market. It will be especially good if this time the increase in the price of bitcoin and top altcoins is accompanied by a general increase in all altcoins, as it was at the end of 2017.