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

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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>
This commit is contained in:
test-user
2026-05-24 17:12:42 -07:00
parent 27ad5b7645
commit 3a1c5427c8
5 changed files with 29 additions and 2 deletions
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data/synthid_corpus/manifest.csv
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@@ -108,3 +108,5 @@ c86973424817f62510e2a312b85c52e05adf47ace87a8e717fd442607596f501,c8697342-aistud
1f81827c06d67cf6f6c7f5d53ec8f9738183942a6d1d2717b161fea0fdcc540a,1f81827c-Designer.png,pos,Microsoft Designer,dall-e (Designer),1024,1024,png,"OpenAI, Microsoft",yes,c2pa-metadata,2026-05-24T22:18:40Z,C2PA issuer OpenAI+Microsoft; synthid_source=OpenAI (DALL-E surface inherits OpenAI SynthID+C2PA)
f3ebe4683fc40aa2a0b80cc3ced3dc8062385ae32b488f4b33cb2330949e658d,f3ebe468-leonardo_lake.jpg,neg,Leonardo.ai,lucid-origin,1024,1024,jpeg,,,none,2026-05-24T22:22:15Z,non-SynthID AI; NO provenance metadata (no C2PA/IPTC/SynthID)
12775f4c0aec1ecd615e88c4941a788a053d0258d08d31ad34d330d3e21969bd,12775f4c-grok_original.jpg,neg,Grok (xAI),aurora,784,1168,jpeg,,,none,2026-05-24T22:47:46Z,full-res original via Download button; xAI non-adopter; NO C2PA/IPTC/SynthID (has benign EXIF block)
74b605deb102d74443a182f70fbea34a6a470bed381d62ae0bfa0083a6ecc5a3,74b605de-_e1f7984d-98e7-4cdc-91d2-f72314a4bc56.jpeg,neg,Bing Image Creator,MAI-Image-2e,1024,1024,jpeg,,,c2pa-metadata,2026-05-25T00:10:28Z,C2PA issuer Microsoft; non-SynthID; issuer-coverage fixture
f9bb6b1039ee228221d2eead7daebd46422a36a4a8959a74fa0198e1aa19f9b8,f9bb6b10-a_red_ceramic_coffee_mug_on_a_wooden_table_soft_morning_light_photorealistic_20260525000725_04.png,neg,Stability Brand Studio,Stable Image,1024,1024,png,Stability AI,,c2pa-metadata,2026-05-25T00:10:31Z,C2PA issuer Stability AI; non-SynthID; no imwatermark
1 sha256 filename label source model width height format c2pa_issuer synthid_metadata verified_via added notes
108 1f81827c06d67cf6f6c7f5d53ec8f9738183942a6d1d2717b161fea0fdcc540a 1f81827c-Designer.png pos Microsoft Designer dall-e (Designer) 1024 1024 png OpenAI, Microsoft yes c2pa-metadata 2026-05-24T22:18:40Z C2PA issuer OpenAI+Microsoft; synthid_source=OpenAI (DALL-E surface inherits OpenAI SynthID+C2PA)
109 f3ebe4683fc40aa2a0b80cc3ced3dc8062385ae32b488f4b33cb2330949e658d f3ebe468-leonardo_lake.jpg neg Leonardo.ai lucid-origin 1024 1024 jpeg none 2026-05-24T22:22:15Z non-SynthID AI; NO provenance metadata (no C2PA/IPTC/SynthID)
110 12775f4c0aec1ecd615e88c4941a788a053d0258d08d31ad34d330d3e21969bd 12775f4c-grok_original.jpg neg Grok (xAI) aurora 784 1168 jpeg none 2026-05-24T22:47:46Z full-res original via Download button; xAI non-adopter; NO C2PA/IPTC/SynthID (has benign EXIF block)
111 74b605deb102d74443a182f70fbea34a6a470bed381d62ae0bfa0083a6ecc5a3 74b605de-_e1f7984d-98e7-4cdc-91d2-f72314a4bc56.jpeg neg Bing Image Creator MAI-Image-2e 1024 1024 jpeg c2pa-metadata 2026-05-25T00:10:28Z C2PA issuer Microsoft; non-SynthID; issuer-coverage fixture
112 f9bb6b1039ee228221d2eead7daebd46422a36a4a8959a74fa0198e1aa19f9b8 f9bb6b10-a_red_ceramic_coffee_mug_on_a_wooden_table_soft_morning_light_photorealistic_20260525000725_04.png neg Stability Brand Studio Stable Image 1024 1024 png Stability AI c2pa-metadata 2026-05-25T00:10:31Z C2PA issuer Stability AI; non-SynthID; no imwatermark