Dealing with the US is always tough because they have a very wide reach in financial cases. They often classify crypto issues as money laundering or fraud. It is definitely possible for them to send a request if they think their laws were broken. You should check out https://extraditionlawyers.net/ as they have specific experience with crypto-related charges and US extradition. It is all about the "double criminality" rule - whether the act is a crime in both countries. You need a solid defense strategy right from the start. Do not wait for the arrest warrant to arrive. These cases are complex and require lawyers who understand both the tech and the international treaties. It is better to be prepared for the worst.