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VerifBox is a free file time-stamping service. It lets anyone prove that a file existed, byte for byte, no later than a given date — without ever uploading it. Your browser computes the file's SHA-256 fingerprint; only that fingerprint is sent. VerifBox adds the date and time and signs the whole twice, with Ed25519 and with ML-DSA-65, a standardised post-quantum signature (FIPS 204). The fingerprint and the signed attestation are then anchored separately in the Bitcoin blockchain through the open OpenTimestamps protocol, and the fingerprint receives an RFC 3161 time-stamp token from IIC TSA. No account, no cookies, no tracking, and no file stored: VerifBox keeps no copy of your file or of your proof. Every proof can be checked by anyone, on verifbox.com or offline, with standard tools such as OpenSSL and OpenTimestamps and with open-source verifiers published on GitHub. Transparency: VerifBox is published by HTTPS CARD — Internet Identity Card Limited (England and Wales, no. 09168431, London), which also operates IIC TSA; IIC TSA is therefore not an independent third party. A VerifBox proof is a simple electronic time stamp, not a qualified one under the EU eIDAS Regulation: it shows that a file existed at a date, not who created or owns it, and its evidential value is assessed by the court. Typical uses: designs and artwork, contracts and drafts, source code, manuscripts, evidence photos, research data.
Contact info
Kemp House 124 City Road, EC1V 2NX, London, United Kingdom
- contact@verifbox.com
- verifbox.com
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