The first digital-only art auction by auction house Christie’s has sold a work by the artist Beeple for $69m (£50m). The digital artwork, The First 5000 Days, a montage of images made over the last 13 years and posted to Instagram, was sold as an NFT, a Non-Fungible Token – in other words the buyer gets no physical object, just the ownership of the art in the digital world. Beeple, real name Mike Winkelmann, has...