receipts.youSeal a screenshot→
The sealer · Folio II
runs in your browser · no upload
§ Drop, seal, share

Seal a screenshot

Drag a PNG or JPG below. Your browser hashes it locally and receives back a QR-stamped version + a public receipt URL. We only ever see the hash. The image itself never leaves your machine.

Drop a screenshot here
or click to pick · PNG, JPG, WebP · up to 25 MB
Your image is hashed in your browser. Only the SHA-256 hash (32 bytes) is sent. We never see the image.
We do not verify this URL. It's shown on the public receipt page as context only.
§ What just happened
  1. You picked an image. Your browser computed its SHA-256 hash. Only the 32-byte hash was sent to our Worker — never the image bytes.
  2. Our Worker signed the hash with our ECDSA P-256 key, minted a short receipt ID, and submitted the hash to the OpenTimestamps calendar for external timestamp anchoring.
  3. Your browser drew a QR code linking to the receipt page, composited it onto the original image, and hashed the result. The second hash (stamped) was sent back to lock the receipt against QR-paste fraud.
  4. You got the stamped image. Anyone who scans the QR lands at the public receipt page, drops the image, and finds out instantly whether it matches.