France
Cadastre
Property & housing
3 entries, read from France to Germany.
France
Notaire
Notar + Grundbuchamt
The register, not the notary, guarantees the title.
France
Service de la publicité foncière
Grundbuchamt
A court keeps it, and entry is what transfers ownership.
Each entry cites its sources and shows when it was last checked. Where no equivalent exists, the entry says so.