QED is the keystone inscription of Scott Duke Kominers’s puzzleart practice on Bitcoin. Kominers is an economist and mathematician, as well as a semi-professional puzzle creator. His “πdentities” series is a mathematical portraiture project exploring how structure shapes identity – treating the digits of π as both subject and material. This πdentity doublet paints Kominers’s self-portrait via digits of π starting with “QED” at position 1152, and using colors from his 1337 Ordinal (#9859). Created by Kominers on August 16, 2025, and inscribed by ORDINALLY. Each representation is 45 x 45 (= 2025), recognizing the fact that 2025 is a perfectly square year.