This NFT is a certificate of attendance for "Proof of X," an art exhibition in which the unknown X is revealed together with artists and visitors. Proof of X visitors will receive the right to acquire this NFT, which they can own by entering their own name. The NFT visual is a generative artwork based on the main visual of the exhibition, and the graphic will be different for each owner. It is also a proof of visit that acts like a visitors' name book in a typical exhibition. We hope that this NFT will remain with the exhibition "Proof of X," which will continue to change its theme and reveal the unknown X in the future.