Could you give an example of how this works in the real world? Can I create a hash of a PNG of the Mona Lisa and sell that to the highest bidder, and who owns the Mona Lisa in that case? Can I change a single pixel in the PNG, create another hash and sell it again, over and over? Can I sell it once more as a JPEG or in a different resolution? Can I sell it on multiple blockchains? What happens to my ownership of Mona Lisa if I die and nobody knows my private key?