SteMi Labs
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Prototype available • Looking for candid feedback

Authenticity for the AI Era

SteMi Labs • Early prototype

PixelSeal cryptographically seals a digital master image so any modification becomes detectable — even if metadata is removed.

Try the demo → How it works Q&A
Lossless formats: PNG / WebP (lossless) Deterministic verify: Valid / Modified Built for master files
What PixelSeal is

Tamper-evident protection for high-value images

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

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

PixelSeal protects the file itself

PixelSeal embeds a tamper-evident integrity seal directly into the image data. If the image changes, verification fails.

Core  Seal a lossless master image
Core  Verify integrity anytime
Optional  Cryptographic signing for stronger verification
How it works

Three simple steps

1

Seal

Seal a lossless master image (PNG/WebP lossless).

2

Share

Share the sealed image as your authoritative master copy.

3

Verify

Verify later to confirm the file is unchanged (Valid / 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 (e.g., 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 a lossless image.
  2. Seal it and download the sealed 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 (starter)

Quick answers

What formats are supported?

The prototype supports lossless formats (PNG and WebP in lossless mode).

Why not JPEG?

JPEG is lossy; saving/re-saving changes pixel values and breaks pixel-level integrity verification.

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.

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