[thoughtexprmnt]

Isn't the "value" of a currency in it's relative stability over time? That is, the confidence by those who use it that it will be exchangeable for roughly the same amount of goods and services today, tomorrow, six months or a year from now (accounting for nominal inflation, of course).

If you accept that premise of what a viable currency should be, then it seems like the volatility of Bitcoin and other cryptocurrencies have thus far made them failures. I mean, if a national currency had similarly rapid changes in value, wouldn't we see financial chaos, riots, and revolution?