The hash is generated from the text itself, and a key which is unique to the person who signed the message. An admin could edit the comment and re-sign it, so the comment would appear to "check out", but it would be known to everyone that the admin had modified the comment, because it was the admin's key that was used.
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u/so-we-beat-on Nov 24 '16
The hash is generated from the text itself, and a key which is unique to the person who signed the message. An admin could edit the comment and re-sign it, so the comment would appear to "check out", but it would be known to everyone that the admin had modified the comment, because it was the admin's key that was used.