If I want the maximum anonymity while buying it?
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You don’t have to use the registrar’s DNS system.
I use LuaDNS. They even offer a fully functional free tier that might be enough for your needs.
They have an API that can be used with certbot, and you can manage your zones with git.
Ah right, sorry, switched things up. Indeed, I also use my registrar’s DNS system, but if I switched to something that has an API supported by certbot (e.g. dns zones that cost 0.5 eur in large cloud providers) it would work.
I use cloudns for nameserving. It’s free