Check a fingerprint
on Base Sepolia.
Public read. No wallet required. Hash a file locally and check whether its fingerprint exists in the onchain registry. Prove a file is unchanged since it was registered.
Choose a fileYour file stays in your browser. Only its SHA-256 fingerprint can leave. Max: 100 MB.
Receipt import
Validate a downloaded receipt
Import an OpenProof receipt JSON. Schema checked locally, hash checked onchain.
Drop receipt JSON or choose oneOpenProof validates the local JSON schema, then checks the receipt hash against Base Sepolia.
Receipt import
Import a downloaded OpenProof receipt JSON.