No browser, no app, no SDK. SSP fires 1 on the content loop; context shifts the trigger. dooh replaces site/app in OpenRTB 23; imp.qty.multiplier scales viewer count per play. Unlike 9, render lags win by hours. 6 proof-of-play: async, ≤48h.
FIELD NOTES
- imp.qty.multiplier can be <1 (3 AM empty hall) or 100+ (Times Square)
- Billing = (price/1000) x multiplier — not per-play
- nurl fires at win; burl fires at render — split can be hours apart