Does defamation constitute a violation of negative rights?
why would it?
Where there is no property there is no justice; a proposition as certain as any demonstration in Euclid
Fools! not to see that what they madly desire would be a calamity to them as no hands but their own could bring
If it is manifested as fraud, then I suppose yes.
To paraphrase Marc Faber: We're all doomed, but that doesn't mean that we can't make money in the process. Rabbi Lapin: "Let's make bricks!" Stephan Kinsella: "Say you and I both want to make a German chocolate cake."
You do not own your reputation, so no.