How? I wonder... Why should anyone make the effort to get verified (idendity) at a bitcoin exchange, to buy a cryptocurrencie with fees, with which he/she then can buy something on the internet? It is so much easier to use a credit card, it is already established and everyone knows how it works. Also the fluctuation of the price prevents normal people to even consider buying ordinary stuff on the internet. Imho cryptocurrencies will only get used if the merchants credits you the saved fees of the credit card fees, or if you have to hide something (like porn or drugs from darknetmarkets). How and why do you think cryptocurrencies will ever become mainstream?