Isn't it obvious though that you're the only one who used that key before it was published?

No, you can backdate notes.

Hell no. Engrain notes in stone. I don't want all the little hucksters who come around every market cycle going around deleting receipts. Reputation matters. You wanna say something you own it. You can't take it back IRL, you shouldn't get to undo it online. Transparency. Reality. Truth.