Hashed email addresses as persistent advertising identifiers

Dead Internet Theory: Hashing an email address changes its representation but does not necessarily make it anonymous: two systems that normalize and hash the same address can still produce the same value and match records together.

https://switchboardtechservices.com/articles/dit-hashed-email-addresses-as-persistent-advertising-identifiers/

By Switchboard Tech Services · Originally published 2026-05-19

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