One of the things blockchain could do is become a digital proof of ownership, augmenting or replacing things like property deeds and car titles. We already agree that a written record of ownership of such things is legally binding (even if the writing is stored digitally), but transfer of that ownership to another person is still a very manual process. Imagine an NFT that represents ownership of your house, and when you want to sell your house, you transfer that NFT to someone else's custody - adding their ownership information to it. It would record the entire chain of ownership, and specific details about the piece of property involved.