if you don't want to involve title deeds changing hands (or legal documentation indicating ownership changes), you risk forfeiting protection of the law.
That's the goal of crypto, isn't it ? To forfeit "protection of the law" so that in the end, we can do away with law and state.
Anything else one does with crypto, begs the question. Essentially, trading stuff and being able to live off it, without depending on a public extortion system called taxes, and being able to enjoy economic freedom.
You buy your protection then also with crypto (that is to say, with smart contracts tying armed groups to your bought rights).