Thử nghiệm · đánh giá C2PA · Hàn 3/2027 · Nhật 6/2027 · luật Hàn

Bản quyền C-2026-036487 · Đơn bằng sáng chế 10-2026-0100026 (chưa đăng ký)

Five-step pipeline · re-identification path

XMSE media provenance stack

Watermark → forensic marking → perceptual hash → C2PA signature → anchor. Each step shows what it inspects and its evidence field.

Plain words · exact workings

Trust that links into one line (the XMSE stack)

Stamp → fingerprint → tamper check → certificate → (optional) registry. Each one you add gives others more clues to check.

The simple story

Imagine adding, in order, to a homework drawing: (1) an invisible stamp, (2) a fingerprint number, (3) a tamper check, (4) the teacher’s stamp (C2PA) and (5) a school registry entry (NFT).
Even one helps, but with several layers it becomes much harder to fake.

How it works, exactly

Run order (bottom → top): watermark → forensic → fingerprint → C2PA → chain/NFT.
The UI labels show them as 1 → 5.

Easy to mix up

This is not a page that just lists technology names. Try the samples below yourself.

Switch tabs to play an image, video, music or document, then press the check buttons.

Demo · see it for yourself

Samples you can try

Play photos, video, music and documents, take their fingerprint number, and check their Content Credentials (C2PA). XenLook holds thousands of character media files; these few samples were picked to show the idea and the check simply.

The invisible stamp

Left and middle look the same to the eye. Right is a magnifier that blows ε up 40×.

what you see ≈ original + ε

Real VideoSeal encoding uses a smarter pattern. This is a lesson in why it stays invisible.

1 Watermark

NFT metadata preview (stub before minting)

{
  "name": "The invisible stamp",
  "image_or_animation_url": "/xmse-demo/demo-still-epsilon.png",
  "mime": "image/png",
  "sha256": "(filled in after the fingerprint check)",
  "c2pa": null,
  "xmse_pipeline": "watermark→forensic→fingerprint→c2pa→chain"
}

Why the layers stack

No single signal closes provenance. Watermark, marking, hash, signature, and anchor read different axes — we do not merge them into one score.

Invisible mark

Axis	Invisible mark axis
Requirement	Decoder/policy match · invisible default
Evidence	WM extract log · policy SSOT

Invisible to humans; readable by detectors.

Status: wired-unverified

Invisible mark →

Forensic marking

Axis	Tamper trace axis
Requirement	Sigil (Apache-2.0) · TruFor excluded
Evidence	Sigil (Apache-2.0) · forensic heatmap

Surfaces tamper traces. Reprocessing strength vocabulary only.

Status: wired-unverified

Forensic marking →

Work fingerprint

Axis	Perceptual hash similarity
Requirement	PDQ/pHash distance · re-identification path
Evidence	Fingerprint DB · recall@FPR

Find similar images by perceptual hash — not embedding.

Status: in-progress

Work fingerprint →

C2PA signature

Axis	Manifest · certificate
Requirement	Immutable conformance pack · AL1 target
Evidence	Manifest · OCSP/CRL

Internal signing live. Conformance packs are not mutated during audit.

Status: verified

C2PA signature →

Permissioned hash anchor

Axis	Transparency log
Requirement	C1 Merkle · C2 inclusion proof · C3 closed chain · Crystal
Evidence	Transparency log · /api/portal/transparency/proof

Media on CDN+C2PA. On-chain: hashes and proofs only.

Status: wired-unverified

Permissioned hash anchor →

Apply status

Item	Status	Note
Commercial OSS catalog	verified	MIT/Apache only
C2PA generator	verified · internal signing live · AL1 target · audit pending	portal live
Soft pipeline	wired-unverified	pre-sign hooks · C2PA soft binding planned
Neural encode	wired-unverified	torch weights pending
Issuance record anchor	planned	public mainnet not adopted

NFT credentials C2PA generator