I'm curious about the availability of Changelly in the United States. Is it legal to use Changelly for cryptocurrency transactions within the country? Are there any restrictions or limitations that users in the USA should be aware of when utilizing Changelly's services? Additionally, what measures does Changelly take to ensure compliance with regulations and laws in the USA? I'm interested in understanding the overall experience of using Changelly in the USA and any potential challenges or benefits associated with it.