keep in mind that: governments and banks might not like bitcoin for some reason. maybe because they will lose profits or power or something else or all at once. this means that they wont like people who are using bitcoins because they like power and dont want to give it away. this means that they wont like such a country for the same reason. and you need friends in other countries so they not only will not invade you but will protect you from invasion from other hostile countries. which means any country who would like to have bitcoin as national currency would have to have strong army so nobody will come and say you shouldnt use bitcoins because if you do, people in our country will probably also want it and we dont really like that idea ... or even worse our people are migrating to your country which we also dont like ... and also i forgot to mention that you are terrorist since you are threating our peacefull country and ruining our well prospering economy so accept our few nukes that are heading toward your capital as a gift ...
as long as we dont have physical location as a country they cant bombard us, we have to destroy them first
Bah.
No goverment would give a frack about the currency. The problem is rather that very little new land is made.
If you conquer a country, they and their neighbours have an obligation to fight you and either kill you or throw you out.
It might be doable to buy up a part of a country and declare independence, but unless that land is considered worthless, you might get problems.
Only real-world possibilities are remote locations, very poor locations or the seasteading idea.
