MiniMax writes a TC260-PG-202511A SecurityData object with SM3withSM2
signatures. The label signature verifies on all four local MiniMax videos
against the guide's appendix A.1 message, and the Binding signature over the
compact Bindings entry; the SM3 content hash does not match a naive selection.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>