@fresh-football-47124: What do you thick of using seeds that have a similar assignment and storage (cookie) process as the tracking id for randomization. We could for example allow for tens of thousands of different seeds with millions of users. In that way a user cannot be identified by there seed, but we could use it for randomisation. I know that strictly speaking we are violating independence by that and should cluster in the analysis, but I would love to not track the seed at all, such that supervisory authorities can really not mistake it for an identifier. I also believe that with a lot of seeds and therefore clusters, the impact of actually clustering should be very small, right? FYI @mysterious-iron-16289 @microscopic-honey-15884