Interestingly, the NFTs are not just a static art. Each ball tracks match metadata and was linked to a 19 cm x 19 cm section on a tennis court. A winning shot that lands on any section of the court is linked to an owner’s NFT. If one of the 11 championship points landed on the plot, the owner of the connected NFT was rewarded with a physical ball used in the game, encased in a custom handcrafted case. Each ball sold for around 0.07 ETH (about $90 at the time).