In all likelihood it would just be part of a check box questionnaire when you register to become a "qualified investor".

Even with IP/ISP blocks you will get a few percent of US customers using a vpn to get what they want.

There are blacklists of countries IP address ranges you can add to the HTAccess file on the server.

When I had my business I never sold to some countries due to the nature of the product, since they were making up a lot of my bandwidth attempting to hack my ecommerce site I just blocked them. It cut down on 99% of hacking attempts. The remainder were likely using a proxy/vpn to try to get to it.


Interestingly here in Canada they are going to try their own crypto "Mintchip" this year....so it would be pretty hypocritical to ban cryptos and try to produce your own. (I wouldn't put it past our asshat PM to try to do so though.)  I think this is why they are staying so open to the idea of crypto currencies.