According to libertarian writings (not an expert), ownership of scarce goods is first attained by being first to put thing to productive use. After that, mutual agreement/trade for chain of ownership.
But yeah, in practice not so much
Discussion
Yeah, sounds good in theory. Not a fan of the libertarians, not an enemy either. I don't see a world where that ideology would succeed. State is cancer, therefore no amount would be acceptable. Sadly the state will persist until the end of times.