Proof-of-Display (PoD)
Vojo Harvester
Hard proof of what actually hit the glass, not what the schedule hoped.
The Vojo Harvester is a patented, independent camera sensor that watches a screen the way an advertiser would, not the software feeding it. It fingerprint-matches what actually displayed against the scheduled campaign, so every verified play becomes evidence, not a claim.
How it works
Read the screen. Match the campaign. Log the proof.
The Harvester runs the same three-step pipeline on every play: it reads the screen independently, matches what it sees to the scheduled content, and logs a verified record.
01 · Read
An independent sensor watches the glass
The Harvester is a separate device from the player. It observes the screen itself, the same way a passer-by would, rather than reading a software playback log.
02 · Match
Fingerprint matching against the campaign
What the sensor reads is matched against the content fingerprint for the scheduled campaign, confirming the right creative actually appeared, not just that something was sent.
03 · Proof
A verified Proof-of-Display record
A matched read is logged as a verified play, timestamped and tied back to the campaign and screen: evidence you can put in front of an advertiser.
Why a playback log isn't enough
What Proof-of-Display catches that a log can't
A scheduling log proves content was sent to a player. It can't prove a screen was on, showing the right creative, and actually seen. The Harvester measures the screen itself.
Wrong or missing content
Confirms the creative that appeared matches what was scheduled, not just that a play was dispatched.
Screen health, sampled continuously
Black, white and RGB channel sampling catches black screens, frozen frames and display faults that a playback log never sees.
Downtime a log can't show
Because it watches the glass independently of the player, the Harvester can tell the difference between content that played and a screen that quietly went dark.
From sensor to report
What data reaches your portal
Every Harvester reports back to the Vojo platform, feeding live fleet health and advertiser-grade reporting without any manual reconciliation.
- A verified Proof-of-Display record for every matched play, tied to the campaign and screen
- Screen-quality sampling (black, white and RGB) feeding fleet health monitoring
- Calibration and connection status per sensor, visible in the CMS
- Verified delivery rolled up into advertiser-grade reports
Vojo's Proof-of-Display technology is protected by granted patents in the United Kingdom (GB2583366, GB2597434) and the United States (US 12,176,999), with a European patent application pending.
Works with any player
No Vojo Player required
The Harvester watches the screen, not the software, so it verifies displays driven by any player or signage system you already run. Attach it to any screen you want to verify and premium-price, licensed per device. Run the Smart DOOH Player as well and you get playback, healing and verification managed in one place.
See verified play, live
Book a demo to see the Harvester verifying a real screen, or view a sample report to see what your advertisers receive. Full hardware specification is available on request.