Re: [blink-dev] Fwd: Intent to Extend Experiment: Protected Audience Bidding & Auction Services

Wed, 26 Jun 2024 10:53:51 -0700 

Hi Russ,

I'm trying to refresh my memory on the history of this experiment.
Experiment first approved on 10/19/23 for M119 to M121, https://groups.google.com/a/chromium.org/g/blink-dev/c/2bwMHd3Yz7I/m/BzI3_qoCAwAJ
Request on 4/4/24 to renew from M124 to M127, https://groups.google.com/a/chromium.org/g/blink-dev/c/2bwMHd3Yz7I/m/xaJHFJ_uAAAJ
Approved 4/12/24 (“for another 3 milestones”), https://groups.google.com/a/chromium.org/g/blink-dev/c/2bwMHd3Yz7I/m/Pm842qm_AAAJ
Requesting M127 to M130 on 6/20/24, https://groups.google.com/a/chromium.org/g/blink-dev/c/2bwMHd3Yz7I/m/RigQFZilAgAJ
Question: what happened between M122 and M124? Was the experiment not running? 


On 6/20/24 2:52 PM, 'Russ Hamilton' via blink-dev wrote:

(Now *To* blink-dev instead of just CC)


        Contact emails

pauljen...@chromium.org, behamil...@google.com


        Explainer
Chrome: https://github.com/WICG/turtledove/blob/main/FLEDGE_browser_bidding_and_auction_API.md <https://github.com/WICG/turtledove/blob/main/FLEDGE_browser_bidding_and_auction_API.md>
Services: https://github.com/privacysandbox/fledge-docs/blob/main/bidding_auction_services_api.md <https://github.com/privacysandbox/fledge-docs/blob/main/bidding_auction_services_api.md>
Note that this explainer has a helpful onboarding section <https://github.com/privacysandbox/fledge-docs/blob/main/bidding_auction_services_api.md#onboarding-and-alpha-testing-guide>for setting up the services. 


        Specification
A work-in-progress pull request <https://pr-preview.s3.amazonaws.com/brusshamilton/turtledove/pull/1200.html>on the Protected Audience spec <https://wicg.github.io/turtledove/>describes some of the changes to the W3C spec. We are reaching out to the IETF ART Area Directors for assistance beginning the standardization process for some of the server-side aspects of this API. 


        Summary
We propose extending the Bidding and Auction Services origin trial currently operating on 1% stable. 

Recent changes:

 *

    Prompted by developer concerns about scalability, we have recently
    added support in M127 for limiting the size of the Bidding and
    Auction request payload

 *

    We also added controls to enable sellers to select which buyers
    are included in the payload when it doesn’t affect the outwardly
    visible size of the encrypted data.

 *

    Additionally the Bidding and Auction server has recently added
    support for features such as buyerReportingId and bid currency.
We have decided to extend the experiment to give developers time to experiment with the new features. We would like to request extending the end milestone from M127 to M130. 


        Blink component
Blink>InterestGroups <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EInterestGroups> 


        TAG review
For Protected Audience: https://github.com/w3ctag/design-reviews/issues/723 <https://github.com/w3ctag/design-reviews/issues/723> 


        TAG review status

Completed for Protected Audience, resolved unsatisfied.


        Interoperability and Compatibility


        Gecko & WebKit: No signal on parent proposal, Protected
        Audience. Asked in the Mozilla forumhere
        <https://github.com/mozilla/standards-positions/issues/770>,
        and in the Webkit forum here
        <https://github.com/WebKit/standards-positions/issues/158>.


        Edge: Microsoft has proposed their Ad Selection API
        (https://github.com/WICG/privacy-preserving-ads/
        <https://github.com/WICG/privacy-preserving-ads/tree/main>) as
        a similar TEE on-server auction API. That API looks like it
        would have an identical Web Platform API as the Bidding and
        Auction Services API. We have biweekly meetings with
        Microsoft, and are open to collaborating on specifying the API.

WPT Tests
We have started to implement some tests <https://chromium-review.googlesource.com/c/chromium/src/+/5622101?>, but work is still ongoing. 


        Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/4649601971257344 <https://chromestatus.com/feature/4649601971257344> 


        Links to previous Intent discussions
Intent to prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CABQTWrnSdvf7RgK2wxsmC6rWc8eRoqDZOvgwVFuEx1r2nqmAJg%40mail.gmail.com <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CABQTWrnSdvf7RgK2wxsmC6rWc8eRoqDZOvgwVFuEx1r2nqmAJg%40mail.gmail.com> 


        Intent to Experiment:
https://groups.google.com/a/chromium.org/g/blink-dev/c/2bwMHd3Yz7I <https://groups.google.com/a/chromium.org/g/blink-dev/c/2bwMHd3Yz7I/m/BwMKwPP6GQAJ> 


Intent to Extend Experiment:
https://groups.google.com/a/chromium.org/g/blink-dev/c/2bwMHd3Yz7I/m/xaJHFJ_uAAAJ <https://groups.google.com/a/chromium.org/g/blink-dev/c/2bwMHd3Yz7I/m/xaJHFJ_uAAAJ> 


Thanks,


–Benjamin “Russ” Hamilton

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