What proof of play is
Proof of play is the record that an ad actually appeared. Every time a screen renders your creative, that display, a play, is captured as a log entry: which screen, at what moment, in what place, showing which ad. Collect those entries across a campaign and you have proof of play, a delivery record you can read line by line instead of a promise that the campaign "ran for two weeks."
The distinction is between an estimate and a receipt. Classic out-of-home billing rented a screen for a fixed window and reported an audience estimate; there was no display-level confirmation that your specific ad ran when it should. Digital out-of-home changed that, because the screen's media player can report back each time it plays. Proof of play is simply those confirmations gathered up. It is what turns "we booked the screen" into "here are the displays that were delivered."
Why proof of play matters
It matters for two things a campaign lives or dies on: honest billing and real attribution.
On billing, proof of play means you pay for what ran. If a screen was offline for part of a day, the missing plays are not in the log, so they are not on the invoice. The number you are charged is a count of delivered displays, not a rate card for a window that may or may not have delivered. That is the difference between paying for exposure and paying for airtime.
On attribution, the play log is the anchor. Because each entry is time-stamped and tied to a place, you can line it up against what happened next: store visits near those screens, web sessions from those areas, sales in that window. Without a verified play log there is nothing solid to line up against, so measurement collapses back into a guess. The measuring a DOOH campaign guide shows how the log feeds foot-traffic and web-lift measurement, and the attribution guide for D2C brands ties it through to sales.
How Blindspot delivers it
0
verified plays, one worldwide flight
0
days, delivered in full
0M+
screens reporting plays
0%
more plays than planned
On Blindspot, proof of play is built in rather than bolted on. Because the platform prices and bills per play, it has to know exactly how many plays ran, so every screen's player reports its displays back into a delivery log tied to your plan. You watch the plays accumulate against the schedule you set, screen by screen and hour by hour, in the live campaign view. There is no separate reconciliation exercise at the end; the log is the campaign.
That log is also the honest floor under the numbers we quote. On one worldwide tourism flight the platform recorded 2,146,892 verified plays across more than four thousand screens over 51 days, and delivered 87% more plays than planned, and every one of those was a logged display rather than a modelled figure. The full breakdown is in the Visit Maharashtra case study. It is the same discipline at any budget: whether the plan is one screen or a global flight, you can point to the exact displays your money bought. Open the map and build a plan in the booking flow.
Not "we booked the screen," but here are the displays that ran.
Proof of play, in one line