Vojo Harvester™
The glass doesn't lie.
An independent sensor watches the screen itself. That is Proof of Display: proof from the glass that a playback log can never invent.
It ships with Passport and goes on the panels that need hard proof, adding to the same play and its vTrust Score. No special setup.
Why a log is not enough
The log says it played. The glass says otherwise.
A scheduling log proves content was sent. It cannot prove the screen was on, lit, and showing the right creative. Harvester can.
The screen was off
- Playback log
- status: played_in_full ✓
- The glass
- Dark panel. Nobody saw anything.
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The frame was frozen
- Playback log
- status: played_in_full ✓
- The glass
- One still image held for the whole slot.
SUNLARK
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The wrong creative ran
- Playback log
- status: played_in_full ✓
- The glass
- A different advertiser's spot on the glass.
In every one of these the log does not go quiet. It reports a successful play. That is the difference between evidence that is incomplete and evidence that is wrong, and it is only visible to something watching the screen rather than the software.
- Wrong or missing creative
- Confirms the creative on the glass matches what was booked, not only that a play was dispatched.
- Screen faults a log never sees
- Black screens, frozen frames and display faults show up in continuous sampling, while the playback log stays quiet.
- Downtime vs delivered play
- Because it watches the glass, Harvester can tell delivered content from a panel that quietly went dark.
How it works
Read. Match. Prove.
Think of a security camera for the ad. Not for the people walking by: for the panel itself. The same three beats run on every play it covers.
Read the glass
A separate sensor on the screen watches the panel itself. Separate from the player, separate from the software log.
Match the campaign
What the sensor sees is matched to the content fingerprint for the scheduled campaign. Right creative, right panel.
Log Proof of Display
A matched read becomes a Proof of Display record, timestamped and tied to campaign and screen. It joins the same play Passport already carries.
The sensor samples the panel itself.
Awaiting match
campaign · screen · timestamp
The sensor is separate from the player and from the playback log, so the record does not depend on the thing being checked. Colours shown are illustrative.
Truly independent
Independent of everything, including us
Independence has two halves: who is doing the reporting, and where they are standing. An operator log fails both. Passport is a real third-party report, but it reports from inside the render.
Only a sensor stands outside the playback path entirely. Whatever put the picture there, our stack or somebody else's, it either appeared on the glass or it did not. That is why Proof of Display is the ceiling.
Patented · UK & US
Vojo's Proof of Display method is granted in the UK and US, with a European application pending. The practical point for buyers: this is not a software ping dressed up as glass proof.
Always with Passport
Passport carries the ad. Harvester proves the glass.
Harvester always ships with Passport. Passport runs on every screen; fit Harvesters where Proof of Display counts, and it joins the same play automatically.
Passport · inside the ad · every screen
Watches from inside your ad
Content-level check-in that travels with the creative. Nothing to install on the operator side.
More on PassportHarvester · on the glass · where fitted
Watches the glass from outside
That is Proof of Display. It sits on top of Passport on the screens with a Harvester. No special wrap, no second creative path.
Proof of Play vs Proof of DisplayThe honest ceiling. Harvester does not replace Passport's proof; it adds to it on the same play. vTrust Score rolls both layers into one comparable number and scores only the layers really there, so a screen without a Harvester gets no invented glass credit.
Where it fits
Screens where the proof pays for itself
A sensor per screen is a real cost. It earns that back where verified delivery changes what the slot is worth, or what an argument costs you.
Rate-card upside
Premium and large-format
Roadside, retail flagship, stadium bowl. Slots priced high enough that a buyer will ask what actually ran, and where verified delivery lifts the rate.
Fewer disputes
Networks that get audited
Agency or brand buyers reconcile your numbers against their own. When the count is provable you can stop padding campaigns with free impressions to cover the margin of error.
Ground truth
Estates you inherited
Mixed hardware, uneven maintenance, no reliable picture of which panels are really lit. The sensor tells you what the logs will not.
No site visits
Screens that are hard to reach
Place-based screens in remote, secured or spread-out locations, where sending someone to check a panel costs more than the slot earns. The sensor checks it every play, so nobody has to travel to find out.
Proof of notice
Compliance messaging
Hospitals, transport hubs, venues and workplaces where a notice has to be on the screen and someone may later ask whether it was. The sensor shows it was visible, not just scheduled.
See what the glass recorded on a live panel, next to what the log claimed.
How it compares
What people usually compare it to
Logs, reports and tags all have a place. Two questions separate them: who is reporting, and where they stand.
| Evidence | Who reports | Where it stands | Good for | What it misses |
|---|---|---|---|---|
| Player / CMS playback logs | The seller's own software | Inside the playback path | Operations and basic delivery tracking inside one network. | Cannot prove the panel was on, lit, or showing the right creative. It reports success either way. |
| Operator report alone | The seller | Their own systems | Fast when relationships are close and stakes are low. | Advertisers increasingly want third-party glass evidence. |
| Creative tags, no glass sensor | A third party (this is where Passport sits) | Inside the player's render | Content-level check-in across networks, with no hardware. | Inherits whatever the render does. Not an independent eye on the glass. |
| Harvester, on top of Passport | A third party | Outside the playback path, watching the glass | Proof of Display from the glass on the screens where it is fitted. | A sensor per screen is a real cost. Fit it where proof is worth it. |
Questions
Before you book a demo
- Can I buy Harvester without Passport?
- No. A Harvester always ships with Passport: Passport carries the play and proves it from inside the ad, and Harvester adds Proof of Display from the glass on top. Fit Harvesters on the panels that need hard proof.
- Does every screen need a Harvester?
- No. Passport runs on every screen. Harvester goes on the screens where buyers need Proof of Display, typically premium, large-format or audited inventory.
- Do I need a particular player?
- No. Harvester watches the screen, not the software. It works with the standards-based players and signage systems you already run.
- Does Passport need a special setup for Harvester?
- No. If a Harvester is fitted on that screen, Proof of Display joins the same Passport play automatically. No special wrap, no second creative path.
- Is Proof of Display the same as Passport?
- No. Passport proves the play from inside the creative. Proof of Display adds proof from outside, from Harvester watching the glass. Two levels of proof that work together on the same play.
- How does this relate to vTrust Score?
- vTrust Score scores all the proof that is really there: Passport's from inside the ad, plus Proof of Display where a Harvester is fitted. Without a Harvester, glass credit is not invented.
Proof of Display
The glass doesn't lie. Prove it that way.
Fit Harvester where buyers need hard glass proof. It adds proof from the glass to the same Passport play, and the vTrust Score counts it, with no change to the creative.
- Independent of the player
- Proof of Display from the glass
- Auto-joins Passport
20 minutes. Live panel or sample report. Plain answers.