NFTs still hot! A digital-only artwork has sold at Christie's auction house for an eye-watering $69m (£50m) - but the winning bidder will not receive a sculpture, painting or even a print. Instead, they get a unique digital token known as an NFT - a non-fungible token. NFTs are "one-of-a-kind" assets in the digital world that can be bought and sold like any other piece of property, but they have no tangible form of their own. Twitter founder Jack Dorsey has promoted the first-ever NFT of the first ever tweet, with bids hitting $2.5m.
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