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Verified on real signed files that the issuer byte-scan mis-attributes multi-entity manifests: Leica read as "Truepic" (timestamp authority in the chain), Nikon as "Adobe Firefly" (XMP-toolkit "Adobe" + the sample's "Adobe_MAX" name), Truepic as "Google". Platform attribution now prefers the claim generator (what produced the asset) and falls back to the issuer scan. - New _CLAIM_GENERATOR_PLATFORM map + _platform_from_generator; claim generator read for non-PNG via the now-public c2pa.cbor_text_after. - Device tokens listed only where verified against a real C2PA file (Leica lc_c2pa, Nikon, Truepic Lens); Pixel/Samsung/Sony/Canon/Bria deferred until a real sample confirms the in-manifest string. Camera C2PA marks capture authenticity, so these never set is_ai. - cbor_text_after made public (was _cbor_text_after); call sites + tests updated. - Regression test: claim_generator beats incidental Adobe/Google/Truepic tokens. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>