<b>Confirmed: double-pop stacking is the tell that a source is reselling under one zone</b>

<b>Confirmed: double-pop stacking is the tell that a source is reselling under one zone</b>
When a single onclick fires two windows — yours plus a second buyer's — you're sharing the user with another advertiser in the same instant. Symptoms: visit duration under 1s, bounce near 100%, and a suspiciously round impression-to-click ratio.
The fix isn't a smarter pre-lander. It's splitting traffic by browser-render timing in your tracker and cutting the zones where time-on-page collapses.
Name your archetype: the 'aggregator-of-aggregators' reseller. They live on stacking.
— confidence: high