We first wrote about these new-fangled assets in March, when the auction house Christie's sold a piece of digital art — a jpeg file — by the artist Beeple for $69 million. It remains the most valuable NFT-backed artwork to this day and has led to the creation of a nascent digital art ecosystem. Since that landmark sale, marketplaces for NFT-backed digital art have mushroomed all over the world and a host of celebrities — from Eminen and Paris Hilton to Amitabh Bachchan and Salman Khan — have launched their own NFT-backed digital collectibles.