Every cell image, signed at the source.

CellProof takes a fingerprint of each microscope image and signs it with your lab's key. Change one pixel, or slip in a generated cell, and the proof no longer matches. Poisoned images get caught before they reach the AI.

Real blood smear with a neutrophil, as captured — Plate A · as captured · signed Checking
Verifying signature…

Same blood smear with one pixel changed — Plate B · same image · 1 pixel changed Checking
Verifying signature…

Real stained blood smear, image BloodImage_00000 from the BCCD Dataset (MIT license). Red blood cells around one neutrophil. Signed live in your browser with a throwaway "Demo Lab" key.

Step 1

Sign images

Sign images right after capture. Each signature records the image fingerprint (SHA-256), who signed it and when, using ECDSA P-256, the same signature family the C2PA standard uses.

Signer

Key IDGenerating…

Key created–

Drop microscope images to sign or tap to choose files · PNG, JPEG, TIFF · nothing leaves this browser

Signed images appear here.

Step 2

Verify images

Drop any images, for example a training set, to check them against the ledger. Green means signed and unchanged. Red means changed since signing. Amber means no signature was found.

Drop images to verify or tap to choose files

Verification results appear here.

Step 3

Ledger

Every signature this browser knows about. Copy it to share with another lab, or paste one in to check their images.

Image	Fingerprint (SHA-256)	Signer	Signed at

Paste signatures (JSON)