At least Bitcoin isn't a fractional reserve currency. Bitcoin itself is mined much like Gold and has a limited quantity. The value of each Bitcoin is created and strengthened by the vast quantity of miners around the globe. Bitcoin is a store of value which moves in the direction of the media, government, businesses and developers who support it.
Bitcoin has limited quantity but not the stable value like gold so the chances of using it as reserve for value to any currency is null and bitcoin itself a currency whereas gold is not.