Every action leaves a mark. Every mark is permanent.
In most systems, audit logging is an afterthought — a text file that grows until someone rotates it. In KEPOS, the Ledger is a foundational architectural component. An append-only data structure where every action performed by every module is permanently inscribed the moment it occurs. No deletion. No modification. No backdating. No exception. The Ledger does not care about storage costs or convenience. It cares about truth. Every API call, every authentication event, every data transformation, every decision made by every module — all of it is written once and preserved forever. When a regulator asks what happened, the Ledger does not reconstruct an answer. It simply opens the page. The answer was written in real time, at the moment the event occurred, and it has not changed since. This is not logging. This is permanent institutional memory.