It is called the Principauté de Monaco
Works somehow on a Proof of Stake model: show the dough, live there, pay zero taxes
It seems to be a good idea...Pay no taxes and live free. But believe me, it is not at all practical. In Such society, Only rich and Strong can survive, the Crime rate will increase like HELL. Taxes are somehow important to live free and safe.
I'm a liberal person but I think tax are needed to be in safe in a country. Police and other forces will be helping the harmony of the society and this will help us live in harmony. We can be free without tax but this might not be good.