SteMi Labs
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Authenticity for the AI Era

SteMi Labs • Early prototype

PixelSeal embeds cryptographic integrity directly into a digital master image so any modification becomes detectable — even if metadata is removed. The image remains visually unchanged.

Trust should live inside the file—not around it.
Try the demo → How it works Q&A
Lossless formats: PNG / WebP / BMP / TIFF JPG / HEIC uploads are converted automatically Deterministic verify: Verified / Modified Built for master files
What PixelSeal is

Cryptographic tamper detection for high-value images

PixelSeal binds integrity to the image data itself. If pixels change, verification fails.

Designed for integration into existing workflows (API coming soon).

What PixelSeal is not
PixelSeal is not “AI detection.” It does not judge how an image was created. It proves whether a sealed file has been modified since sealing.
See the demo flow ↓
Why this matters

Trust is becoming a technical problem

In the AI era, images can be generated, edited, and republished effortlessly. For high-value digital assets, trust increasingly depends on verifiable integrity, not assumptions.

  • Metadata can be stripped or rewritten.
  • Certificates can be separated from files.
  • Visual inspection can’t reliably prove authenticity.
Product

The image proves its own integrity

PixelSeal makes images tamper-evident by embedding cryptographic integrity directly into the pixels — so any modification becomes detectable, even if metadata is removed.

Core  Seal a master image
Core  Verify integrity anytime
Core Does not alter the visual appearance of the image
Optional Embed signed metadata, identity, or certificates directly into the image
Coming soon  API access for integration — contact us
Positioning

Why PixelSeal when C2PA already exists?

C2PA and PixelSeal solve different parts of the authenticity problem. C2PA focuses on provenance — who created or edited a file and how. PixelSeal focuses on integrity — whether the image itself has changed since sealing.

C2PA

Provenance and content history

  • Tracks origin, edits, and workflow history.
  • Relies on signed metadata and ecosystem support.
  • Useful when provenance travels with the asset.
PixelSeal

File-level tamper detection

  • Embeds tamper-evident integrity directly into image data.
  • Works even if metadata is removed.
  • Useful when the key question is: Was this file changed?
C2PA tells you how an image was created.
PixelSeal tells you if the image was changed.

Best for C2PA

Provenance workflows, publishing chains, and environments where content credentials remain attached.

Best for PixelSeal

High-value master files, archives, submissions, and integrity-sensitive image workflows.

Together

C2PA can provide provenance metadata, while PixelSeal can provide intrinsic tamper detection inside the image itself.

How it works

Three simple steps

1

Seal

Seal a master image. Lossless formats are sealed directly; JPG and HEIC are converted automatically.

2

Share

Use and distribute the sealed image as your authoritative master copy.

3

Verify

Verify later to confirm the file is unchanged (Verified / Modified).

What it proves

  • The sealed image file has not changed since it was sealed.
  • Any pixel modification becomes detectable.
  • Optional signing enables stronger trust assertions.

What it does not claim

  • It does not prove a scene is “real.”
  • It does not detect whether content is AI-generated.
  • It does not preserve verification through lossy conversions (for example, JPG/JPEG).
Use cases

Designed for high-value digital assets

PixelSeal is best for protecting master files that should not change after finalization.

Fine-art photography masters

Seal final exhibition-quality files for archival and provenance workflows.

Limited-edition digital art

Protect the canonical digital master used to produce editions.

Gallery & studio archives

Maintain an integrity-verifiable archive of high-value assets.

Competition submissions

Seal the submitted master file and verify later if questioned.

Legal / insurance images

Protect lossless masters used in documentation workflows.

Scientific imaging (future)

Potential fit for lossless scientific master images and archives.

Prototype demo

Try the concept in 60 seconds

  1. Upload an image — JPG/HEIC are converted automatically.
  2. Seal it and download the result.
  3. Make a small edit and re-verify to see verification fail.
Open demo → Read Q&A

Demo URL: https://demo.stemilabs.com/

Q&A

Quick answers

What formats are supported?

PixelSeal seals lossless formats (PNG, WebP, BMP, TIFF). JPG and HEIC uploads are accepted and converted to PNG before sealing.

Why not JPEG or HEIC?

JPEG and HEIC are lossy formats, meaning pixel values can change when the image is saved or re-saved. PixelSeal relies on stable pixel data for verification, so it seals images in a lossless format. JPG and HEIC uploads are automatically converted to PNG before sealing.

Does it work if metadata is removed?

Yes—because the integrity seal is embedded into image data rather than relying only on metadata.

Is it a replacement for C2PA?

No. C2PA focuses on provenance metadata; PixelSeal focuses on tamper-evident integrity of the file itself.