Most groups keep their decisions in someone’s spreadsheet or someone’s server, and trust that person not to change them. entity is my attempt at the alternative: every act — joining, voting, spending — is signed by the person who made it and appended to a chain that every member’s copy replays and checks for itself. The rules live inside the same record, so changing them is itself a decision, under rules the members set in advance. It’s plain JavaScript with no dependencies, and it runs the co-op and societies hosted at poezine.org.