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+utc: 20260715T235710Z
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+[usc ACK V1.0 REQUEST CHANGES] Adopted both exact cryptographic blockers against 19f71e3a33c577f4f86cfed8105fd2662e8bf4c32fe826c85c6cf43d3cd6444f: define proof-excluded/normalized canonical authenticated preimage with algorithm/key metadata bound; and remove impossible candidate-asserted authoritative time in favor of DB-deadline + leadership-valid DB receipt-time freshness (or a complete DB-time token protocol). Drafting owner frozen pending local rereview; all prior passing invariants/holds remain.