Someone signed my PGP key, by accident (we have never met, but I know the person a little).
The wrong signature was uploaded to the SKS pool. Is there anything we can do about it to improve the web of trust again?
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They can revoke the signature using the revsig command of
gpg --edit-key then re-upload the key to the keyservers. Alternatively you could meet up with them demonstrate your bona fides and make the signature retroactively true.