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warning: long post ahead; probably screenreader unfriendly

i wonder would it be possible to add some sort of "identity servers" to fedi so that, let's say i'm @lina@lina.moe even tho i'm using a mastodon instance hosted elsewhere

could see that as a hierarchy? of keypairs
let's say i use tech.lgbt as my mastodon server, meaning it has generated a keypair, perhaps `tech.lgbt/@lina@lina.moe#mainkey`
identity server would then sign the public key, so the Actor object would have this?
```
{
// ...
"identity": "https://lina.moe/lina",
"publicKeyPem": {
"id": "https://tech.lgbt/@lina@lina.moe#mainkey",
"publicKeyPem": "...",
"signature": "..."
}
}
```
and the identity server would be able to verify the signature to say "yes that's lina" or "no she's being impersonated"

please boost so that i get feedback on how weird and impossible this idea is and maybe if someone has actually implemented smth similar before 🥺