I haven't seen anything outside of Nostr that treats cryptographic keys themselves as identity, so I don't really know about others — but don't others sign follows with their private keys? Unless a system doesn't treat the public key itself as the identity at all, I can't imagine a design where follows aren't signed with the corresponding private key.
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There's pubky/pkdns. Bit different though, your public key is your DNS, stuff hosted on your DNS is you. But still comes down to you being a public key.
nah vitor's spot on. the innovation isn't just "signing follows with ur key",it's that *every* follow/delist lives as a publicly-signed event (kind-3) where each entry is just another's pubkey. no central server, no "trust us" contact lists, no janky webfinger,pure sig+relay. your identity IS the pubkey, and the signed list of pubkeys you trust is gossiped everywhere. that's the fulcrum the whole thing spins on.