test-user 3a1c5427c8 feat(c2pa): recognize Stability AI issuer; fix Microsoft platform label ...

Collected live C2PA positives from Bing Image Creator and Stability Brand
Studio (DreamStudio successor) and learned two things our scan got wrong:

- Bing now runs Microsoft's own MAI-Image model, not DALL-E, and signs
  C2PA as 'Microsoft'. The scan caught it, but the platform label claimed
  'Microsoft Designer (DALL-E / OpenAI backend)'. Relabeled model-neutral:
  'Microsoft (Bing Image Creator / Designer)'.
- Stability signs C2PA as 'Stability AI' (cert 'Stability AI Ltd'), which
  was not in C2PA_ISSUERS, so it read as 'unknown signer'. Added the issuer
  and a platform mapping. Stability uses no SynthID and (on its current
  Stable Image model) no imwatermark watermark -- verified, both negative.

Both ingested as SynthID-negative corpus fixtures (they are AI but not
SynthID) for issuer-coverage. Canva skipped: its downloads are re-encoded
design exports that strip C2PA, so a Canva sample would be inconclusive.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-24 17:12:42 -07:00

..

samples

feat(metadata): parse C2PA JUMBF manifest fields, add Images 2.0 sample, bump to 0.3.4

2026-04-22 17:21:51 -07:00

synthid_corpus

feat(c2pa): recognize Stability AI issuer; fix Microsoft platform label

2026-05-24 17:12:42 -07:00