In the digital-age that we are living, Crypto-currencies are the most practical store of value as long as the internet exists. If we are at the point where the internet is no longer and the world is in total chaos, then what good is gold and silver anyway? People will be more worried about food and survival each day. Carrying gold and silver around will do you no good. You can argue that Food is a better store of value than Gold when SHTF.