[throwaway2048]

If tomorrow somehow everyone's memory got wiped so they could no longer remember say, Mt. Rushmore, It would continue to exist.

If the same thing happened with Bezos's wealth, it would cease existing, or at least the concept of him owning it would cease existing.

That's the difference. Ownership of property is entirely within people's minds.

[zrm]

If tomorrow somehow everyone's memory got wiped so they could no longer remember how to make Pad Thai then it would cease to exist as well (unless someone independently reinvents it). That doesn't mean Pad Thai exists by consensus.

If so much as one person still remembers and can prove it to everyone else, or it's documented somewhere on paper, then it would still exist. Likewise all Bezos would need is that documentation. Which is really how it works in practice. There are only a handful of people and documents concerned with exactly what someone owns. The large majority of people have no idea who owns an arbitrary piece of land or share of stock. The information comes from an authority, not a consensus.

Whereas if we're talking about the concept of property rights in general rather than specific ownership records then we're back to them being enforced by a government which it is in principle possible for them to do via superior force independent of popular support.