Use public blocked moderation lists as -0.5 assertions when both soft-vouch flags are active. Preserve explicit precedence and one contribution per author-target pair. Import referenced lists without participant enrollment. Store original subscriptions, definitions, and memberships as cache dependencies. Apply snapshots atomically and retain replay tombstones for list events. Expose list provenance in paths and document delegated membership, record limits, and recovery risks. Cover ingestion, replay, snapshots, source precedence, cache invalidation, and account lifecycle. Task: tsk-23