BlockProve – Certified Proof

BlockProveDev

About this app

A photo can be disputed. A BlockProve proof can be verified.

A landlord keeping your deposit, an insurer disputing a claim, a design copied, harassing messages deleted: once the dispute starts, it is too late to create evidence. With BlockProve, you create it yourself, right away, from your phone or your computer.

CAPTURE OR IMPORT
• Certified photo, video and audio, captured inside the app
• Import any document: PDF, contract, image, ZIP archive
• Several files grouped into a single deposit
• GPS location added if you allow it

SEALED ON YOUR DEVICE
• AES-256-GCM encryption before anything is sent: no one can read your files, not even us
• Post-quantum ML-DSA signature (NIST FIPS 204), designed to withstand tomorrow's computers
• Qualified eIDAS timestamp (RFC 3161) from a European trust service provider: the date is presumed accurate throughout the European Union

STORED FOREVER ON THE BLOCKCHAIN
• Anchored on the Arweave blockchain, built for permanent storage
• "Full archive" mode: the encrypted file itself is kept on-chain, not just its fingerprint
• Your proofs remain accessible and verifiable even if BlockProve ever disappeared

A CERTIFICATE READY TO SHOW
• PDF certificate: SHA-256 fingerprint, transaction ID, qualified date and time
• Free verification by anyone, without an account, using open-source tools
• PCAP proof protocol, with a public specification

FOR PROFESSIONALS
• Web capture report on Mac and Windows following the NF Z67-147 method: environment audit, browsing, captures, sealing
• Shared workspaces, end-to-end encrypted, for your team's case files
• Prior art for your designs, contracts, plans and source code

YOU KEEP THE KEYS
• Your identity relies on a 12-word phrase (BIP-39) generated on your device
• Your private keys never leave your device
• Encrypted local vault, biometric unlock, mandatory two-factor authentication

SIMPLE
Your first deposit is free. 1 BPV credit = 1 deposit kept for life (up to 30 MB), with no subscription needed to keep your proofs.

BlockProve SAS, a French start-up based in Le Mans, supported by Le Mans Innovation.

The weight of evidence is assessed by the judge. BlockProve provides technical guarantees of integrity and date; the app does not replace legal advice.

What’s new

Fixes the SMS sent during sign-up.