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Add com.etchv.watermark.1 (entry 61) - #93

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etchv-labs:add-com-etchv-watermark-1
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etchv-dev wants to merge 1 commit into
c2pa-org:mainfrom
etchv-labs:add-com-etchv-watermark-1

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@etchv-dev etchv-dev commented Oct 28, 2026 •

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Adds Etchv's invisible image watermark as a soft binding algorithm.

  • alg: com.etchv.watermark.1 (type watermark, images: JPEG, PNG, WebP, TIFF, GIF)
  • Binding value: base64 of the 32-byte watermark identifier, as carried in the manifest's c2pa.soft-binding assertion
  • Resolver: https://api.etchv.com/c2pa/v1 implements the Soft Binding Resolution API (matches/byBinding GET and POST, matches/byContent, manifests/{manifestId}, services/supportedAlgorithms). It is public and needs no credentials. matches/byReference is not implemented.
  • Documentation: https://etchv.com/docs/guides/content-credentials
  • Contact: security@etchv.com

Quick check:

curl https://api.etchv.com/c2pa/v1/services/supportedAlgorithms

We're happy to take a different identifier if 61 is taken first.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LEjSHBvJUTW2DxofZiUsDB
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