A cryptographically sealed, tamper-evident record of a co-presence confirmation event — timestamped at the moment it occurs, independently held, independently verifiable by any party with the record and Vurno's published public key.
89% of UK consumers rely on reviews when choosing services. Fake reviews are sold for $5 each on Telegram. The platforms that act earliest will win consumer trust — and pre-empt enforcement.
The Digital Markets, Competition and Consumers Act 2024 designates fake reviews as a banned practice under UK consumer law, with fines up to 10% of global annual turnover. The CMA completed a review of 100+ websites in July 2025 and wrote to 54 firms citing non-compliance. In March 2026 it opened five new investigations including Autotrader, Feefo, and Just Eat. The CMA's concern is not that platforms verify every review — it is that platforms take no reasonable structural steps to prevent manipulation. A Vurno co-presence record is that evidence.
The co-presence record is created at the moment the visit occurs — before any review is written. It cannot be retrospectively fabricated.
Your platform registers the job and parties via the Vurno API when the visit is scheduled.
When the tradesperson arrives, your platform signals the start of the confirmation window.
The consumer scans a QR code shown by the tradesperson on their device at the job site.
Vurno sends a 6-digit OTP to the phone number provided by your platform. The consumer confirms on the Vurno OTP confirmation page.
Vurno writes an Ed25519-signed certificate to the append-only chain — each entry canonically serialised before signing. The certificate is delivered to your platform by webhook and email.
Vurno is not a directory. It has no listings, no tradesperson profiles, and no commercial relationship with any party on your platform. Its only function is to record whether a visit occurred.
That independence is the product. A co-presence record attached to a review is credible precisely because Vurno has no incentive to favour one platform, tradesperson, or outcome over another.
Stripe processes payments for Shopify and all of Shopify's competitors simultaneously. Shopify trusts Stripe because Stripe has no incentive to favour one merchant over another. Vurno is the same model for review integrity.
Vurno raises the cost and friction of fraud. It does not eliminate it. That framing is accurate, defensible, and the limit of what we claim.
Vurno never receives, stores, displays, or moderates review content. Its records are about whether a visit occurred — not what was said.
No listings, no consumer search interface, no tradesperson profiles. Vurno is backend infrastructure — invisible to end users except for a single OTP confirmation moment.
One or two fabricated records are theoretically possible. At scale, the co-presence pattern breaks immediately and is visible in the audit trail. Fraud becomes economically prohibitive, not impossible.
No consumer accounts. Consumers interact with Vurno once — the OTP confirmation page — then never again. The API is strictly backend-to-backend.
We run a 30-minute introduction call with engineering and product leads at qualifying marketplaces. We cover the API integration path, the compliance evidence trail the co-presence record produces, and what a design partner engagement looks like. No sales deck. Bring your questions.
Book an introduction callTo discuss a design partner arrangement — hi@vurno.co.uk