Desktop exclusive · macOS & Windows

Web capture compliant with the NF Z67-147 standard.

Freeze the state of any web page at a given moment — screenshot, source code, DNS, eIDAS qualified timestamp — and anchor it all for life on the Arweave blockchain. Court-admissible evidence whose integrity and date are technically verifiable.

Download the desktop app See the use cases

Why not just a screenshot?

Because it proves nothing: a screenshot can be fabricated or retouched in two clicks, and courts know it. The BlockProve web capture records the entire page — URL, visual rendering, full HTML source, DNS resolution — in an audited environment, then seals everything cryptographically. It is no longer an image: it is a coherent body of technical evidence.

AFNOR Standard NF Z67-147

The French standard for online evidence, made operational.

The NF Z67-147 standard defines the reference protocol for building digital evidence on the internet: a neutral, audited capture environment, reliable timestamping and full traceability. BlockProve applies this protocol automatically, step by step — and adds eIDAS qualified timestamping (RFC 3161; qualified timestamping under Articles 41 and 42 of the regulation) and blockchain immutability.

The process in 3 steps

Step 1

Capture environment audit

Before any browsing, BlockProve automatically audits the capture workstation — a key requirement of the NF Z67-147 standard: proving the report was made in a neutral, unmanipulated environment. The audit report is embedded in the final proof and visible in the exported certificate.

Data collected What it proves
Public IP addressThe network from which the capture is performed
NTP clock offsetThe machine clock is synchronized (pool.ntp.org) — timestamps are accurate
Proxy / VPN detectionNo intermediary filters or alters the visible web content
Operating systemThe type and version of the capture workstation
Session start UTC timestampThe precise moment the session began
Step 2

Browsing and captures

A secure browser is embedded directly in BlockProve. Browse normally and capture as many pages as needed — each capture joins a visual timeline with thumbnails, building a multi-page file: homepage + product page + legal notices + evidence of the dispute.

Automatically recorded for every captured page:

  • The full URL of the page
  • A high-resolution screenshot (PNG)
  • The complete HTML source code, as rendered — verifiable line by line
  • The DNS resolution: the domain genuinely points to the server hosting the page
  • The precise UTC timestamp of each individual capture
  • The browser User-Agent, as seen by the remote server
Step 3

Cryptographic sealing and blockchain anchoring

Give your report a title and click “Finalize the attestation”: BlockProve automatically chains five operations.

  1. 1

    Structured ZIP archive
    Screenshots, source code and metadata are bundled into a single archive.

  2. 2

    AES-256-GCM encryption
    Key derived from your BIP-39 mnemonic phrase (Argon2id). Only you can decrypt your report — not even BlockProve (zero-access encryption).

  3. 3

    CRYSTALS-Dilithium-5 signature
    The SHA-256 fingerprint of the archive is signed post-quantum: any later alteration would be immediately detectable.

  4. 4

    eIDAS qualified timestamp
    An RFC 3161 token is issued by a Qualified Trust Service Provider (QTSP). This date has legal value across the European Union.

  5. 5

    Anchoring on the Arweave blockchain
    The sealed archive is engraved permanently and immutably. The generated TXID can be verified by anyone in the world, forever.

The guarantees of the web capture

Guarantee Technical mechanism
IntegrityDilithium-5 signature — the content cannot have been altered
Certain dateRFC 3161 eIDAS timestamp — date with reinforced legal value
Capture neutralityNTP / IP / proxy audit report embedded in the proof
PermanenceArweave blockchain — the report exists forever, independently of BlockProve
ConfidentialityAES-256-GCM encryption — only you can read your report
Quantum resistanceDilithium-5 — valid against future quantum computers
Public verifiabilityAnyone can verify integrity from Arweave with the TXID

Integrity verification can be re-run at any time from the report's detail view, inside the application.

Qualified eIDAS timestamp
Provided by Lleida.net — a qualified trust service provider (QTSP) listed on the European Union trusted list.

The exported PDF certificate

At any time, export your report as a signed PDF (PAdES-T), ready to be filed:

  • Environment audit report (IP, NTP, proxy, OS)
  • All captures with their URL, DNS and timestamp
  • SHA-256 fingerprint of the archive
  • Dilithium-5 signature and public key
  • eIDAS timestamp token with the QTSP provider name
  • Arweave TXID for independent verification

Who is the web capture for?

Lawyers & legal teams

Defamation, counterfeiting, unfair competition, e-commerce disputes: admissible online-content evidence.

Businesses

Digital contract breaches, misleading advertising, brand impersonation: document it before it disappears.

Individuals

Online harassment, illegal content, scams: freeze the evidence in a few clicks.

Agencies & creatives

Protect your creations published online and date their disclosure.

Insurers & HR

Build court-admissible documentary files, traceable end to end.

Concrete use cases

Brand counterfeiting

A site copies your visuals and your name. Capture the offending pages with DNS proof that the domain belongs to the counterfeiter — and produce the report in court.

Online defamation

Fraudulent reviews, defamatory posts on a forum: capture before deletion. Arweave proves the content existed on that date.

E-commerce dispute

Capture the product page and the promised specifications before delivery. In a dispute, you prove what was displayed at the time of purchase.

Digital identity theft

An account is impersonating you? Freeze the profile with its date and exact URL.

Contractual documentation

Freeze the state of a web page — terms, prices, commercial offer — at the moment a contract is signed.

Ready to draw up your first web capture report?

The web capture is available in the BlockProve desktop applications for macOS and Windows.

Download the desktop app

Desktop-exclusive feature: the precision and completeness of the capture require a full-size embedded browser.