Add Mastodon-like public Account Verification to Lemmy

[DraconicNEO]

Requirements

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• Is this only a feature request? Do not put multiple feature requests in one issue.
• Is this a backend issue? Use the lemmy-ui repo for UI / frontend issues.
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Is your proposal related to a problem?

On Lemmy I have a lot of accounts, which isn't a bad thing but I have also faced issues with people impersonating me on Lemmy because they either sign up on an instance I never joined, or they sign up with a similar name to mine and just override with a display name. This has led to some confusion from others and while minor I don't think every occurrence of this will be minor in the future.

Describe the solution you'd like.

As related to #6024 I feel strongly that Lemmy should adopt a public account verification system where people can verify their accounts are actually theirs by embedding a link to it on their page. Could be a blog, could be a Github profile. Anything that applies or allows applying rel=me to the links to identify that the account is officially theirs.
Obviously this is an optional feature and people would not be required to do it but for those who want to or experience impersonation it is important.

Describe alternatives you've considered.

N/A

Additional context

I realize that impersonation attacks are relatively rare on Lemmy and that many people don't have multiple accounts either but I do feel that having this or some very similar form of decentralized public verification is still important on Lemmy.

This issue requires that number #6024 be completed in order for it to be done, since it requires being able to put links in the Link field to verify them.

[asudox]

I've been using Keyoxide for this. It's pretty good and allows afaik unlimited amount of proofs.

[DraconicNEO]

I've been using Keyoxide for this. It's pretty good and allows afaik unlimited amount of proofs.

That's really cool and I think I'll start using that even on my Mastodon accounts. Although I do think it's very important to have the feature natively in Lemmy because Keyoxide has the flaw that it requires extra steps for people to verify the account, and its something I know a lot of people just aren't going to do to check.
If lemmy had mastodon-like Link verification it shows a checkbox on the link within the Lemmy UI (or on the Lemmy apps people use when it's supported there) meaning that there's no extra work required for them to verify.
The link field will just show a checkmark if the page has an HTML link with rel=me and won't show anything.