One year ago, an artwork was sold for US$69 million (£52.6 million) by the prestigious auction house Christie’s. This was no lost Matisse or rarely seen Van Gogh. Instead, it was a composite collection of digital art by the then relatively unknown artist Beeple. What makes this piece, Everydays: the First 5000 Days, truly remarkable, is that it was sold as a non-fungible token (NFT). In the year since that sale, NFTs have gone from a relatively obscure tech-world phenomenon to the mainstream. NFTs are tokens that exist on a secure record-keeping system called a blockchain. These tokens are akin…

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