I don’t see why rental agreements can’t be registered with the county like house sales are. It would also eliminate the need for squatter laws, as it would be trivial for police to pull up the county website and see who belongs in the home.
Americans are too privacy focused to accept this, but I could easily see a cottage industry of "registered agents" popping up around it who sign leases on behalf of individuals and shield them from public scrutiny.
Alternatively we could keep the names private. A cryptographic solution would easily serve the need of authorities verifying the right person is in a place without identification, but good luck figuring out how to ensure the tenant has their keys somehow since in the US there are zero pieces of identification you can ensure every citizen has.
I think publishing your own rental contract is already legal?
(Unless the other party to the contract deliberately asks you in the contract to keep it quiet. But that's something you need to actively agree to.)
Well, a Torrens registry systems still isn't universal yet in the US.
Berlin wants to do that to enforce rent control more effectively.