He went fishing, the bait was bitcoin and the whale swallowed it  .

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Unless you move completely to safe heaven it is not possible to get away avoiding the taxes, the authorities are planning to come up with rules and regulations and you think it will be easy like moving to another country cashing out and coming back in.

Suppose you open a bank account in Salvador and cash out everything you still want to move that money back to the US and how you are going to do that without showing the source of income especially if it is a huge amount. The best option is always to find a Chartered Accountant who knows how to file a tax with cryptocurrency and he will help you with filing the tax with the loopholes that is available without getting into trouble.