There's lots of dislike about nano in HN and outside for some reason but on paper it does seem to do well as a currency. https://nano.org
What it needs is actual adoption in the real world. I want to be able to buy a pizza with it, but nobody seems to offer it as a payment option yet.
Perhaps what will make it take off is some video game or other digital economy adopting it as their in-game currency. It seems perfect for that.