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Victor Kuznetsov
a0a349cc66
Earlier notes asserted BFL hosted output has no open DWT-DCT watermark. That was overstated: the test carriers were high-texture fox images where a clean encode->decode round-trip of a KNOWN-embedded watermark recovers only 28-35/48 bits (below the safe 44 gate), so the detector would miss a present mark there -- the None is inconclusive, not proof of absence. Verified positive-control (2026-06-19): imwatermark dwtDct round-trips 48/48 on synthetic carriers and on chatgpt-1.png (48/48) / firefly-1.png (45/48), but FAILS on flux-1.png (28/48) and doubao-1.png (39/48). So invisible_watermark detection is a positive-only signal: trust a hit, treat a miss on busy content as inconclusive. Affects all open SD/SDXL/FLUX DWT-DCT detection. C2PA stays the reliable FLUX identifier; whether BFL hosted embeds the open mark is unresolved (needs a low-texture hosted sample). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>