One of the most important features of retargeting is how recently the user agent has become a member of an interest group. And more generally speaking there are obviously many other features similar to that one.
This proposal doesn't address, probably due to scope, how or if those would be implemented in some form even post 3rd party cookies and limits itself to adSignals which look to be relatively simple stuff.
Considering that the auction is running locally and in the browser, would it be possible to introduce the notion of signals provided by the browser? These signals can be quantized or binned to increase the number of members of that group to a minimum non-identifiable way and then would be passed in the auction function.
For example membership of the group could be setup as UAs that joined the group less than: 1, 4, 7, 14, 21, 28 days ago. The browser could potentially provide the number of groups that it is a member of for a given owner and so on. Effectively a way to have some form of modeling of the UA within the browser, in a write only way and read only locally that would be preserving of privacy.
Lastly, with the understanding that it may be too risky to do, what would be the risk of providing global lists of memberships not tied to a specific domain but limited in number (for example you can only set 100 global groups on a browser assigned to my ad network domain). And those are only usable in the auction if enough browsers are members of those groups.
One of the most important features of retargeting is how recently the user agent has become a member of an interest group. And more generally speaking there are obviously many other features similar to that one.
This proposal doesn't address, probably due to scope, how or if those would be implemented in some form even post 3rd party cookies and limits itself to adSignals which look to be relatively simple stuff.
Considering that the auction is running locally and in the browser, would it be possible to introduce the notion of signals provided by the browser? These signals can be quantized or binned to increase the number of members of that group to a minimum non-identifiable way and then would be passed in the auction function.
For example membership of the group could be setup as UAs that joined the group less than: 1, 4, 7, 14, 21, 28 days ago. The browser could potentially provide the number of groups that it is a member of for a given owner and so on. Effectively a way to have some form of modeling of the UA within the browser, in a write only way and read only locally that would be preserving of privacy.
Lastly, with the understanding that it may be too risky to do, what would be the risk of providing global lists of memberships not tied to a specific domain but limited in number (for example you can only set 100 global groups on a browser assigned to my ad network domain). And those are only usable in the auction if enough browsers are members of those groups.