Age verification is a 1-bit proof problem. zkPassport uses ICAO-signed ePassport chips to prove over-18 without revealing DoB; Privado ID does the same over W3C credential attestations. Both have been deployable for 2+ years — the EU has specified neither. When the privacy-preserving stack exists and gets routed around for a centralized phone-home architecture, the design choice is the policy choice.

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