Receipt check

Check a receipt

DrawLab attaches a SHA-256 checksum to the exact receipt text. This page recomputes that checksum in your own browser. A match only proves that the supplied receipt and supplied checksum are internally consistent. It does not prove who created the receipt, when it was created, or independently replay the randomness and selection algorithm. Nothing you paste here leaves your device.

Receipt or receipt fileChecksum (optional, if not already in the file)

Runs entirely in your browser using the standard Web Crypto SHA-256. You can confirm it independently: run any SHA-256 tool over the exact receipt text and compare the digest. This is a checksum tool, not an authenticity signature.