> not only tokens but anything else that can be bought or sold.

Ownership is a combination of possession, control, and enforcement. Blockchain solves the issue with tokens, maybe helps with digital assets, but anything ?

I own my house, for example, because the county records show I own it. But more importantly the county will enforce my ownership and also enforce any related contracts using an armed sheriff.

All that said, I often find myself thinking about this quixotic problem.