User review of the v3.15 Sanity Sample subsection revealed that the
paper's claim of "inter-rater agreement with the classifier in all 30
cases" (Results IV-G.4) was not backed by any data artifact in the
repository. Script 19 exports a 30-signature stratified sample to
reports/pixel_validation/sanity_sample.csv, but that CSV contains
only classifier output fields (stratum, sig_id, cosine, dhash_indep,
pixel_identical, closest_match) and no human-annotation column, and
no subsequent script computes any human--classifier agreement metric.
User confirmed that the only human annotation in the project was
the YOLO training-set bounding-box labeling; signature classification
(stamped vs hand-signed) was done entirely by automated numerical
methods. The 30/30 sanity-sample claim was therefore factually
unsupported and has been removed.
Investigation additionally revealed that the "independent visual
inspection of randomly sampled Firm A reports reveals pixel-identical
signature images...for many of the sampled partners" framing used as
the first strand of Firm A's replication-dominated evidence (Section
III-H first strand, Section V-C first strand, and the Conclusion
fourth contribution) had the same provenance problem: no human
visual inspection was performed. The underlying FACT (that Firm A
contains many byte-identical same-CPA signature pairs) is correct
and fully supported by automated byte-level pair analysis (Script 19),
but the "visual inspection" phrasing misrepresents the provenance.
Changes:
1. Results IV-G.4 "Sanity Sample" subsection deleted entirely
(results_v3.md L271-273).
2. Methodology III-K penultimate paragraph describing the 30-signature
manual visual sanity inspection deleted (methodology_v3.md L259).
3. Methodology Section III-H first strand (L152) rewritten from
"independent visual inspection of randomly sampled Firm A reports
reveals pixel-identical signature images...for many of the sampled
partners" to "automated byte-level pair analysis (Section IV-G.1)
identifies 145 Firm A signatures that are byte-identical to at
least one other same-CPA signature from a different audit report,
distributed across 50 distinct Firm A partners (of 180 registered); 35 of these byte-identical matches span different fiscal years."
All four numbers verified directly from the signature_analysis.db
database via pixel_identical_to_closest = 1 filter joined to
accountants.firm.
4. Discussion V-C first strand (L41) rewritten analogously to refer
to byte-level pair evidence with the same four verified numbers.
5. Conclusion fourth contribution (L21) rewritten to "byte-level
pair analysis finding of 145 pixel-identical calibration-firm
signatures across 50 distinct partners (Section IV-G.1)."
6. Abstract (L5): "visual inspection and accountant-level mixture
evidence..." rewritten as "byte-level pixel-identity evidence
(145 signatures across 50 partners) and accountant-level mixture
evidence..." Abstract now at 250/250 words.
7. Introduction (L55): "visual-inspection evidence" relabeled
"byte-level pixel-identity evidence" for internal consistency.
8. Methodology III-H penultimate (L164): "validation role is played
by the visual inspection" relabeled "validation role is played
by the byte-level pixel-identity evidence" for consistency.
All substantive claims are preserved and now back-traceable to
Script 19 output and the signature_analysis.db pixel_identical_to_closest
flag. This correction brings the paper's descriptive language into
strict alignment with its actual methodology, which is fully
automated (except for YOLO training annotation, disclosed in
Methodology Section III-B).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
gbanyan
0471e36fd4