Propagation kit · Builder's Library

The Consent Propagation Kit

Carry one consent decision all the way to the ad platforms — so attribution stays legal without going dark.

Consent Mode is usually bolted onto the browser and forgotten at the server — which is exactly where attribution breaks. The decision a visitor makes in a banner has to survive the trip to five ad platforms, each with its own field for it. The methodology explains the model; this kit is the propagation plumbing that keeps one decision intact end to end.

The trap is trusting the browser. A consent signal that arrives over the wire can be wrong, stale, or spoofed, so the kit re-derives region and the EEA-denied default server-side from the request itself, then translates that one resolved state into each platform's dialect — Consent Mode v2 for Google, Limited Data Use for Meta, the US-state signals for the rest.

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This kit ships with the playbook it came from: Consent Mode v2 + Meta Limited Data Use — propagating consent end-to-end through the edge fanout.

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