Provenance that survives
the loss of metadata.
Contents Defence embeds an invisible watermark in an image so that its Content Credentials can be recovered even after the file has been re-encoded, re-uploaded, or stripped of its metadata along the way.
What the service does
Invisible watermarking
An identifier is embedded into the image itself. The result is visually indistinguishable from the original and travels with the file wherever it is redistributed.
Verification and attribution
A suspected image can be checked to recover the embedded identifier, which resolves to the issuing account and the moment of issue.
C2PA Content Credentials
Every issued image carries a signed C2PA manifest describing its origin, its creator, and its AI training preferences.
Soft binding
When a C2PA manifest is no longer attached to a file, the watermark acts as a soft binding: the identifier recovered from the image is used to locate the manifest that was issued with it. The identifier below is the algorithm reference used for that purpose.
com.museblossom.contentsdefence.1Media type: image · Type: watermark
C2PA conformance
Contents Defence is listed on the C2PA Conformance Program as a generator product, and both generates and validates Content Credentials.
| Applicant | MuseBlossom Co., Ltd. |
|---|---|
| Product | Contents Defence (Generator Product) |
| Specification | C2PA 2.2 — Assurance Level 1 |
| Conformance date | 11 June 2026 |
| Record ID | 019d9492-c448-76a4-b6a1-00f4f301299d |
Content Credentials
Manifests are issued for JPEG, PNG, TIFF and WebP — the formats covered by the conformance record, for both generation and validation.
Watermarking
Watermark embedding additionally accepts BMP and HEIC. These two are outside the scope of the conformance record and receive no manifest.
Who it is for
Webtoon and illustration studios
Trace which distribution channel a leaked episode came from, without altering how the artwork looks to readers.
Publishers and media desks
Attach verifiable authorship to published imagery, and state AI training preferences in a machine-readable form.
Platforms and marketplaces
Check submitted images for an existing credential before they are accepted, redistributed, or licensed onward.
Contact
For questions about the watermark, the soft binding identifier, or the conformance record.