sorry for this but you can eat gold.

Also, why does our currency need intrinsic value? It represents a debt owed and can be exchanged for things with intrinsic value. The reason dollars, yen, pounds, euros, silver, metal and gold have value is both a social and a legal contract. Cryptocurrencies may have some social contracts that give them value but they lack the legal contract. That's why I think they are doomed unless they open themselves to regulation.