He could host the image himself. He could even just show you the image and transaction proving that he's the owner (of course you'll have to consult the blockch

He could host the image himself. He could even just show you the image and transaction proving that he's the owner (of course you'll have to consult the blockchain to check if he hasn't sold it afterwards). That said, (a) NFT infrastructure is notoriously bad and doesn't work as it is now and (b) why on Earth would you do all that just to prove you own a picture of monkey.