the decline in bitcoin prices that occurred this year is indeed so big and we all certainly feel it when we see the price of bitcoin at the end of 2017, but it must be known that this is an investment, where sometimes there is a fairly high price increase and sometimes a fairly low price decline. if you want to buy bitcoin and plan to save it for a long period of time, I think this is the time to buy, because surely the next few years the price will rise again, even though we never know when the price hike arrived.