Well all of them are known to me, I have used a lot of currency for investment but I prefer to use bitcoin only, I am saying the truth only I have not found any better investment than bitcoin, power of bitcoin is very high and it is not hard for bitcoin to make a poorest person the richest within few months, so we should have faith for bitcoin instead of waiting to me a miracle happen, I never ever prefer any other currency but the bitcoin only that is certain to give us profit and bright future.