On a norms, dollar be like central exchange currency, because for our stuck markets and exchange points, if you go with your local currency to do international transactions, them go still convert am to dollar for you, na the reason why the OP say make we sell 50% of our bitcoin, and I see am as a very good advice, if dollar fall or rise bitcoin go still dey the wey e dey but as you dey exchange am to your local currency na you go see am say you loss as the dollar dey fall. For me those wey still keep all their bitcoin I still dey advice you, because dollar go still go down pass like this wey e day for sure, and if na by then you sell you go loss well well.