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on Base Sepolia.

Timestamp a SHA-256 fingerprint onchain. Prove a file existed at this moment. The file never leaves your browser.

Choose a fileYour file stays in your browser. Only its SHA-256 fingerprint can leave. Max: 100 MB.

Base Sepolia testnet · No real funds required · Only the hash is written onchain

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Register a file fingerprinton Base Sepolia.