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 resign 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 . <| sep |> Yeah , before I read the actual comments he edited I thought he added thoughtsopinions to user comments to change the message of the original author based on the sheer outrage . But then I saw it was a petty move to change the tag from his username to the sub mods ' in fuck you comments and was disappointed . But he fed the trolls a 10 course meal with his actions and that sub is excellent at brigading and blowing things out of proportion to match their agenda . Such a dumb , emotional , decision .