[xyzzyz]

If there's nothing cheaper solution to cryptocurrency than proof of work, it seems to me that we just have to ban cryptocurrency altogether at the legislature level.

[devrandomguy]

Or, you could fund nuclear fusion research. That has better odds of success.

[jstanley]

If you ban it in your country, your country will fall behind.

Cryptocurrency is backed entirely by free market incentives. You can fight the market if you want, but you will lose.

[dogecoinbase]

Countries won't ban it -- countries love it. It's perfectly traceable non-anonymous currency. What they'll do is centralize it so they get the citizen-control benefits (and, of course, the ability to create and destroy it -- imagine EO6102 where they can remotely seize your gold!) without the unsustainable energy expenditure.