Box Office Carbon Copy Afteruse Receipt Mechanic

The carbon-copy afteruse review is opened by state pressure: a later reader attempts to spend the duplicate receipt as clean proof. The review must show the seat row, carbon pressure pattern, cashier witness or explicit absence, sponsor reversal claim, proof bridge, selected posture, after-state, and future route effect.

The mechanic rejects fixed-turn triggers and raw receipt-count triggers. It progresses only when a branch mutates named counters and future route flags that later payment, identity, or custody readers can consume.