It's fairly easy to verify the origins of statements here, especially since Jack is on Twitter announcing his NFT on his timeline. What more than that do you need?

Same as you verify any celebrities selling movie props on ebay or whatever, if they haven't announced the sale via some other channel where they are already verified, don't trust that it's the real deal in the marketplace.

> Which is why the Beeple NFT sale didn't happen somewhere in the nether of the internet, but through Christie's, a 300 year old seller of art, after buyer and seller had communicated personally.

This is a feature, not a drawback. You can make the sale however you want, via bank transfer, cash in hand or actually transfer Eth to a wallet. What matters in the end is who stands as the owner in the blockchain, but how it gets there, is irrelevant.

> Also as a sidenote, you have actually no idea whether this particular blockchain will still be around in the future. In fact given the volatility of tech that's not really that likely to be honest.

This is a separate issue from NFTs and applies to the whole cryptocurrency space. For now, the $1.5 trillion market is disagreeing with you that it can disappear in the future, as otherwise people wouldn't put so much money into the ecosystem.