And they should be. It's a direct threat to their monopoly on money.

Because of this, they're trying everything they can to crush bitcoin.

They're urging people not to buy it. They're calling it a bubble. They're even talking about launching their own rival digital currencies.

Regular readers know that I think these efforts will fail. But I couldn't help but wonder what Doug Casey thinks of this. So, I called him up a few days ago to get his take…

Justin: Doug, governments around the world seem to be waging a war on bitcoin.

Do you see expect to see more of this in the years ahead?

Doug: Absolutely. You can plan your life around governments doing everything they can to discourage not only bitcoin, but all the other private cryptocurrencies as well.