There are various proposals they are working under the umbrella of the Privacy Sandbox project, couple of key ones here: https://github.com/google/ads-privacy/

There are various proposals they are working under the umbrella of the Privacy Sandbox project, couple of key ones here: https://github.com/google/ads-privacy/tree/master/proposals/dovekey https://github.com/google/ads-privacy/tree/master/proposals/... https://github.com/WICG/turtledove https://github.com/WICG/turtledove