Sadly. It would be nice if there was a way to do conversion attribution without the tracking cookies. One idea I've been thinking about lately: * in server-s

Sadly. It would be nice if there was a way to do conversion attribution without the tracking cookies. One idea I've been thinking about lately: * in server-side access logs, include visitor's fingerprint as hash(client_ip + user_agent + maybe_salt) * Look for access log entries with ad campaign specific Referrer values. Call these "Set A". * Look for access log entries with the conversion event (user signs up, user upgrades to paid plan, user makes purchase, ...). Call these "Set B" If any given visitor's fingerprint appears in both the Set A and the Set B, we can assume they came from an ad campaign and converted. Of course, user's IP can change, and many users can have the same IP. So this would be imprecise. But could be better than nothing. And, IMO at least, better than having the tracking cookies, cookie warnings, consent screens, extra sections in privacy policies etc.