A decentral domainname registry what would that look like? A domainname must be unique, that is for sure, or doesn't it?. But in a decentral system what would be the authority to claim a domainname? Maybe it is not really necessary to have a unique name.(many john smiths exist, and that works pretty well) In combination with a npub a domain can be made unique. A search of existing domainnames can be made as well, so that you can choose one that is as unique as possible