Real situations. Indisputable proof.
Rental disputes, stolen innovation, insurance claims, harassment, building permits, web content: six scenarios where evidence makes all the difference — and how BlockProve strengthens its probative value.
the cost of a single bailiff report — versus €29 for a one-time BlockProve deposit
blockchain timestamping admitted as evidence by the Marseille Judicial Court
data readable by our servers — local zero-access encryption
Your landlord is withholding the deposit for damage you never caused?
The legal trap
At move-in as at move-out, the photos attached to inspection reports or sent by email are systematically challenged before the housing-disputes judge. The opposing argument is always the same: possible retouching, EXIF metadata editable in a few clicks.
France's highest civil court regularly reiterates it: an uncertified photograph only counts as prima facie written evidence. The balance of power only shifts when the evidence is beyond dispute.
The BlockProve reflex
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On inspection day, photograph keys, meters, cracks and fixtures directly from the BlockProve mobile app.
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The app captures GPS location and network time, archives everything, encrypts it with AES-256-GCM and signs it with a post-quantum Dilithium key.
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The SHA-256 fingerprint is engraved for life on the Arweave blockchain. No one — not you, not the agency, not the landlord — can ever alter it.
Unlike a file stored on a real-estate agency's server, which can be altered, the SHA-256 fingerprint anchored on Arweave guarantees the judge that nothing has been modified since the day of the inspection.
A competitor is selling your innovation and claims they developed it before you?
The legal trap
To protect an algorithm, a formula or a process without filing a patent — and therefore without making it public — the 2018 trade-secrets act, derived from EU Directive 2016/943, requires two things: reasonable protection measures and a certain priority date.
The traditional tool, the INPI's Soleau envelope, is limited to a few megabytes and charges a fee for every deposit and every renewal. A complete code repository or 3D blueprints simply don't fit.
The BlockProve reflex
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Drag and drop your full folder — source code, blueprints, documentation — into the BlockProve desktop app, even if it weighs several gigabytes.
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AES-256 encryption with Argon2id key derivation runs locally: your sensitive data never leaves your machine unencrypted. Zero-access, end-to-end encryption.
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Post-quantum Dilithium signature, Arweave anchoring: your priority date is sealed for life, in a single deposit, with no renewal.
A lifetime, verifiable-integrity, post-quantum proof of priority, able to absorb volumes the Soleau envelope cannot handle — without anyone but you ever seeing the content.
Your insurer doubts the date of your photos after the storm?
The legal trap
After a loss, you have 5 days to declare it (Article L. 113-2 of the French Insurance Code) — and the contractual burden of proving its extent falls on you.
Insurers frequently reject claims: “you cleaned up before the adjuster”, “nothing proves when these photos were taken”. Without dated evidence, it is your word against theirs.
The BlockProve reflex
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Immediately after the loss, open BlockProve and freeze the scene: photos of the damage, videos, context.
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Each capture embeds network time and GPS location, then is encrypted and cryptographically sealed on your device.
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Instant blockchain anchoring proves the simultaneity between the weather event and the damage observed.
The consumer's self-defense tool against insurance adjusters: evidence timestamped by a qualified third party that the insurer cannot brush aside.
What if the perpetrator deleted every message before the courts ever saw them?
The legal trap
In cases of moral or sexual harassment and cyberbullying, the evidence rests on screenshots of messages or social media. Yet courts increasingly set them aside: apps can generate fake conversations that look more real than the originals.
And a screenshot, even anchored on a blockchain, proves only one thing: that the image existed at that moment. It does not prove the messages actually came from the site. France's highest court requires evidence whose integrity is guaranteed — and a bailiff's report is often unaffordable for a victim.
The BlockProve reflex
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From the desktop app, start a web capture and log into your account on the social network in question, inside an audited capture environment (public IP, NTP clock, no proxy).
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Browse to the offending messages, comments or profiles: every page is recorded with a screenshot, full HTML source code, DNS resolution and UTC timestamp — proof the content was actually displayed on the real site, from your authenticated session.
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Everything is sealed (post-quantum Dilithium-5 signature, qualified eIDAS timestamp) and anchored for life on Arweave — before the perpetrator deletes their messages or their account. In an emergency, a timestamped mobile capture remains a good complementary first reflex.
The web capture doesn't just prove the screenshot existed at a given moment: it proves the messages were actually published on the social network, backed by source code and origin, in line with the NF Z67-147 standard. The doctored-screenshot argument collapses — for a fraction of the cost of a bailiff's report.
Learn more about the web captureA neighbor claims your building-permit notice board was never displayed?
The legal trap
Every building permit requires a regulatory notice board visible from the public road for at least two months (Article R. 424-15 of the French Urban Planning Code). This display is what starts the neighbors' appeal period. If challenged, it is up to you to prove it stayed up continuously.
The Council of State (March 10, 2025, no. 472387) made it clear: plain smartphone photos, even with their metadata, are not enough — metadata can be modified. The classic workaround, a three-visit bailiff protocol, costs €200 to €400 every single time.
The BlockProve reflex
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On every site visit, photograph your notice board in place from the BlockProve mobile app.
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Precise GPS, atomic time, AES-256-GCM encryption, Dilithium signature: the photo is anchored for life on Arweave.
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One photo per week for two months is enough — around ten deposits at €29 each, well below the cost of the traditional three-visit bailiff protocol.
Where the Council of State rejects ordinary photos because their metadata can be modified, BlockProve answers with mathematical immutability: a strong body of evidence, for a fraction of the cost of a bailiff.
The site defaming or copying you can erase everything overnight?
The legal trap
Defamation, fraudulent reviews, a counterfeiting site, a misleading product page: evidence of online content is ephemeral by nature. The author can delete or edit the page at any time — and an ordinary screenshot has almost no evidential value, as it is trivially falsifiable.
The AFNOR NF Z67-147 standard sets the requirements for an admissible online report: an audited capture environment (IP, clock, no proxy), a complete record of the page and end-to-end traceability. This is precisely the protocol the BlockProve web capture applies.
The BlockProve reflex
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From the desktop app, start a web capture: BlockProve automatically audits the capture environment (public IP, NTP synchronization, proxy/VPN detection).
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Browse in the embedded browser and capture every relevant page: high-resolution screenshot, full HTML source code, DNS resolution and UTC timestamp are recorded.
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Finalize: AES-256-GCM encrypted archive, post-quantum Dilithium-5 signature, eIDAS qualified timestamp (RFC 3161) and permanent anchoring on Arweave.
A report compliant with the NF Z67-147 standard, timestamped by an eIDAS qualified provider and engraved for life on the blockchain: the content may disappear from the web — your evidence never will.
Learn more about the web captureEuropean law backs the trajectory.
The eIDAS v2 regulation officially introduces the notion of Qualified Electronic Ledgers and lays down a clear principle: an electronic ledger cannot be denied legal admissibility solely on the grounds that it is in electronic form or that it does not meet the requirements of a qualified ledger.
Combined with the Marseille Judicial Court ruling of March 20, 2025 — blockchain timestamping admitted as evidence under Article 1358 of the French Civil Code — the legal framework has never been more favorable to blockchain-anchored evidence. BlockProve sits exactly on this trajectory: a decentralized data timestamping and integrity service, harmonized across Europe.
One BlockProve deposit: €29, engraved for life.
1 BPV credit = 1 permanent deposit on Arweave (up to 50 MB). One-time deposit at €29, or Confort subscription at €49/month for regular needs.
The legal information presented on this page is provided for information purposes only and does not constitute legal advice. BlockProve provides a technical timestamping and integrity tool; the assessment of evidential value always rests with the judge.