In reply to Martin.

I don’t GTM will work when using a proxy, it’s too dependent on external resources. I’ve tested it a few years back and didn’t get it to work. It might, though, depending on your use case.

As for the reputable sources; I get this question a lot, that’s why I’ve written up a piece about it in CAOS Pro’s documentation. In short, Cloudflare and the University of Oslo are working on a similar approach. However, Cloudflare’s approach is f-in expensive and the university’s approach requires NodeJS knowledge and isn’t fully anonymous (it still passes the UUID stored in everyone’s cookies).

If you (or anyone) have any questions about CAOS Pro, feel free to contact me!