{"id":"pbft-prepared-at-most-once","text":"A `(view, seq)` pair can transition to \"prepared\" at most once per node, enforced by the `prepared_requests` set guard at the top of `_check_prepared`.","truth_value":"IN","source":"entries/2026/05/29/byzantine-fault-tolerance-pbft-_check_prepared.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"pbft-prepared-at-most-once","truth_value":"IN","reason":"premise"}]}}