Sotheby's and Phillips have launched so-called NFT auctions, a month after Christie's sold a digital artwork for $69.3 million, as traditional auction houses seek to capitalise on the craze shaking up the art market. Three months ago, barely anyone had heard of a non-fungible token (NFT), a digital object such as a drawing, animation, piece of music, photo, or video with a certificate of authenticity created by blockchain technology. But ...