I'm pretty sure the US can already do both, and that neither of those would be easier with a US backed cryptocoin.
Literal American cash dollars (which tend to work everywhere, even anti-American regimes) under the table would be more secure. But then assets in other countries are probably just paid through shell companies in those countries with local currency or something.
Literal American cash dollars (which tend to work everywhere, even anti-American regimes) under the table would be more secure. But then assets in other countries are probably just paid through shell companies in those countries with local currency or something.