IP? MAC? Same

Unique fingerprint? Most likely the same with your “private” stuff.

He’s so cute.

It was a joke

Narrator: Of course, it wasn’t.

Well that’s pretty inconvenient. Thanks.

What are the issues?

The goal is only to know if the OP edited it or not. It doesn’t really matter who edited it if it wasn’t the OP. The only important information would be that it wasn’t the OP.

OP can edit comment, sign with a different key and claim his comment was edited by the admins.

So we can’t know who really edited the comment unless in the default boring situation: it was OP and he signed it with the correct key which is the same as him just telling “yeah, it was me” or not saying anything at all since it’s the default.

Can’t the admins just edit it and sign with a new key? Either way there won’t be a way to know for sure who edited the comment, you could know if the original poster did it, but well they can just tell you that.