Things like deeds and titles aren't necessarily locked away without visibility but are necessary to prove ownership in a court of law, the venue where doing that is most consequential. Technologically, it's redundant and unecessary to maintain shared ownership records of everyone else's assets. Practically, if you don't trust the state / your representative government to maintain & adjudicate property ownership rights or contract law disputes, it's a little silly to think conveniences like checking ubiquitous apps on mobiles or the internet itself will still work and that we won't be experiencing the complete breakdown of society by that point.