Indeed, gold has been in existence before now and can be moved from one place to another. Gold is, however, a physical metal that can be used as jewelry, and it has a physical attribute attached to it, but as time goes on, it would be excess in circulation as the mining continues, and that would possibly or likely cause a price decline but I believe it would still be of value.
Bitcoin, as it is called, is a digital gold, limited in supply, and can never be minted again. This limited supply makes it of more value because when the adoption and demand for it increases, the value increases as well, making it a more scarce commodity and a digital resource. One thing I see special about Bitcoin is the fact that it can be carried from one place to another, which can not be done with gold as gold would attract eyes and possible attack on the holder while Bitcoin can never be detected by anybody as one moves about within from one place to another. Since bitcoin is mobile, it can be stored on our phones and other gadgets, which are mobile, and can be transferred from one place to another.