I suspect that countries like El Salvador might accept Bitcoin for such proof.
In El Salvador, they might accept it as proof, but I can't say for sure that other countries would accept it like that.
How is the situation in your own country? My country will not accept Bitcoin because the government is anti-crypto.
There's no story to tell about the Bitcoin situation like other countries that have legalized Bitcoin. However, we are grateful that the government has not banned Bitcoin as a commodity asset even though Bitcoin is prohibited as a means of payment.
Except El Salvador, the rest of the countries are still hesitant to use it as a legal tender