this isn’t just IAB, this was noted as standard behavior for large data brokers by a privacy researcher [1] years ago Email and phone number matching is part o

this isn’t just IAB, this was noted as standard behavior for large data brokers by a privacy researcher [1] years ago Email and phone number matching is part of their core service offered by Oracle’s Bluekai, one the largest data-broker platforms in the world [2]. They have most large global companies using their platform. > You can convert users' email addresses and phone numbers to SHA-256 hashed IDs called oHashes and send them to the platform. They will be synchronized with the network of user profiles that are linked together in the Oracle ID Graph, which is used to manage IDs and user attributes for all Oracle Data Cloud platform customers. > This synchronization optimizes the targeting and communication of your users across desktop and mobile devices and media execution platforms. oHashes enable you to increase your offline to online match rates, connect your Responsys platform to the Oracle Data Cloud platform, and execute cross-device targeting. … > the [normalization / oHash] function enforces UTF-8 character encoding, lowercases all characters in the email address, verifies that it has the “@” symbol, and removes all special characters, punctuation, and spaces. … Both Google and FaceBook also expect clients to send phone + email (hashed) to build retargeting lists from customer data. They each have a different name for the feature [3] [1]https://twitter.com/WolfieChristl/status/1288467207333318656?s=20 https://twitter.com/WolfieChristl/status/1288467207333318656... [3] https://twitter.com/WolfieChristl/status/1288252803341783041?s=20 https://twitter.com/WolfieChristl/status/1288252803341783041... [2]https://docs.oracle.com/en/cloud/saas/data-cloud/data-cloud-help-center/IntegratingBlueKaiPlatform/IDManagement/sending_ohashes.html https://docs.oracle.com/en/cloud/saas/data-cloud/data-cloud-...