“Blackmail..... money from (a person) in return for not revealing compromising or injurious information about that person.......... extortion or coercion by threats especially of public exposure or criminal prosecution.”
Okay, very good.....ya call 911 and don’t pay the blackmail.
You don’t negotiate into a non-disclosure agreement or a publication agreement and then claim you’r a victim of blackmail. Call the cops..........
Even if you pay it this doesn’t protect the person from the fact they were blackmailing you.....it’s still a crime.