this post was submitted on 21 Jun 2023
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There is DID which tries to do some of that. Many methods of registering your identifier have been registered (blockchain, bitcoin, crypto keys, purpose-built software, etc). Linking identities to some entity like this would prove ownership, but getting it implemented in places, encouraging users to use/check it (e.g. almost nobody GPG signs email), not trust similar usernames/domains, etc are all hard problems that having a spec alone doesn't solve.