BEST BEFORE - The Keys The Keys are the child inscriptions used to activate pieces in the BEST BEFORE collection. Each key unseals a sealed piece, triggering an irreversible chain of on-chain events: the key's inscription ID, combined with the confirmation block hash, determines the piece's palette, lifespan, and whether it lives forever or begins its countdown toward expiration. Any inscription can serve as a key — the content is entirely up to the collector. Together, the Keys form a community-built companion collection, each one a permanent record of the moment a piece's fate was revealed.