I'm not sure if the USA has capital gains taxes for crypto purchases yet - not that the government would exempt it, but I'm not sure that the leaden feet of the legislature have caught up with crypto yet and whether it's an "asset" (like a security) or a "currency" (like "yen"). AFAIK, USA doesn't tax gains in currencies - I've been abroad many times and never felt that I needed to declare my pitifully small currency exchanges to the government.