Share producer identities across mark routing, attribution, and pinned signers.
Preserve nested Honor TC260 fields and report unsupported RSA signatures.
Document the Google Photos checks and public sample search.
Use an SDK-signed synthetic carrier for negative EKU checks after the original
Microsoft certificates expired. Skip boundary regex scans when no C2PA
soft-binding identifier is present.
MiniMax signs its TC260 label with SM3withSM2 per TC260-PG-202511A. A
verification-only SM3/SM2 (no dependency provides the SM2 curve) checks the
appendix A.1 label message; a signature under the pinned MiniMax key is a
high-confidence aigc_signature signal, a failing one is a caveat, and every
result is the aigc_signature metadata marker. Pinned by the GB/T 32905 SM3
vectors, OpenSSL's SM2 verify vectors and real MiniMax files. Over 411 local
files the only verdict-record change is the marker on nine MiniMax videos.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Victor Kuznetsov