Sophia is a robot of many talents -- she speaks, jokes, sings and even makes art. In March, she caused a stir in the art world when a digital work she created as part of a collaboration was sold at an auction for $688,888 in the form of a non-fungible token, or NFT. The sale highlighted a growing frenzy in the NFT market, where people can buy ownership rights to digital content. NFTs each have a unique digital code saved on blockchain ledgers that allow anyone to verify the authenticity and ownership of items. David Hanson, CEO of Hong Kong-based Hanson Robotics and Sophia's creator, has been developing robots for the past two and a half decades.