Re: [private-measurement] Interoperable Private Attribution (IPA) (#9)

Yes (1) makes sense and I think it's specified in the doc. (2) doesn't fully cover the second comment though. I could ask all my partner sites to pre-commit to use fb1.com / fb2.com as identity providers without doing any kind of rotation / switching. Then I just double up all my source / trigger events (one per each match key provider) and get effectively double counts for the same privacy budget.

I think what you might have to do (and maybe this is what you were implying with (2)) is that if you pre-commit to N match key providers, you would effectively have more noise added to your aggregations scaled with N to keep similar privacy guarantees and get closer to the user+site grain.

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Received on Thursday, 28 April 2022 01:53:22 UTC