Well you do have an example of this in BTC. For physical property, it might be backed by a smart contract, then whoever takes your land, does so at the risk of being deplatformed. IOW, take my land, then the world around you becomes off-limits. Then you would have to be Alexander the Great to expand your world. Then antagonist is back into an energy expenditure issue. It's just not worth the energy cost to steal your land, so I don't.