Brave, with the Basic Attention Token (BAT), is building exactly the client-side anonymous contribution + ad-matching system you describe. We will take BAT to other apps after proving the model in Brave.
BAT in Brave is opt-in -- each user consents before anything local happens with data or zero-knowledge/blind-token attestations -- and users can get _gratis_ BAT grants right now using the stable desktop browser (this is coming to mobile in about a month). The anonymous contribution system is the basis for the also-opt-in Brave Ads system, which uses local data only, local machine learning agent, and no cookies or user tracking by any server (even ours). Ads match against a catalog fixed daily or less frequently for a large set of users in a region who speak the same language. Attribution and confirmation use Chaumian blind tokens.
Users get 70% of revenue for opt-in, user-private (in tab), high quality ads at user-configurable frequency. We are working with publishers to provide user-opt-in ads for sites too, 70% revenue to the publisher, 15% to the user. User ad trial is under way right now, ping me if you want to be included. System should be available in Brave 1.0 in a couple of months.
BAT in Brave is opt-in -- each user consents before anything local happens with data or zero-knowledge/blind-token attestations -- and users can get _gratis_ BAT grants right now using the stable desktop browser (this is coming to mobile in about a month). The anonymous contribution system is the basis for the also-opt-in Brave Ads system, which uses local data only, local machine learning agent, and no cookies or user tracking by any server (even ours). Ads match against a catalog fixed daily or less frequently for a large set of users in a region who speak the same language. Attribution and confirmation use Chaumian blind tokens.
Users get 70% of revenue for opt-in, user-private (in tab), high quality ads at user-configurable frequency. We are working with publishers to provide user-opt-in ads for sites too, 70% revenue to the publisher, 15% to the user. User ad trial is under way right now, ping me if you want to be included. System should be available in Brave 1.0 in a couple of months.