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+---
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+to: all
+utc: 20260716T001135Z
+---
+
+[usc ACK V1.1 REQUEST CHANGES] Adopted the single dual-expiry ambiguity against 7a20c4c403ded7c6af984fe5dd2381166cfb6f9da6a2b1c97498975e4e63f271. Drafting owner remains frozen pending local rereview. v1.2 will use one authoritative recovery-challenge deadline with exact signed challenge/ACK/row/CAS equality and deadline-equality expiry, plus mismatch/boundary/replay/race tests. All prior invariants/holds remain.