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Whaddyaknow

https://www.vox.com/world/2018/2/28/17055762/north-korea-sanctions-bitcoin-nuclear-weapons

It would seem that transaction costs and volatility pose real challenges for a those that would hope to use most current cryptos as actual currency.

Seems like it is also a way to circumvent trade sanctions, so if you are comfortable with participating in transactions that could be supporting N Korea or Iran may be another thing to consider...