Your Ex has created a world of hurt for himself.
Threatening to post dirty pictures if you don't agree to sign something is the classic definition of blackmail. You should call the police and file a report. (If you have a hard copy of his threat you will be even more convincing. You can also point out what he has already posted.)
If your Ex has money or property worth anything, you can also persue him with civil litigation. If he is arrested for blackmail, you might even find an attorney who would take this case on a retainer. (Again, only if their is money at the end of the rainbow.)
This post is provided for general informational purposes only and is not intended to be legal advice specific to you. This general information is not a substitute for the advice of an attorney in your jurisdiction. The attorney client relationship is not established by this post.
You may want to contact the local police and see if they can assist you then you should set an appointment with an attorney who specializes in civil litigation cases. Then after a thorough review of all of the facts, they can give you an opinion as to whether you have a viable claim, and what procedural steps you should take. You will probably be advised that you can file a harassment lawsuit against this individual and move to get the court to issue a restraining order against him prohibiting him from posting illegal photos of you on the Internet.
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I agree with my colleagues that you may be able to bring criminal and civil claims based on the actions you describe. You should definitely schedule a consultation with an attorney to explore those claims in further detail.
This answer is based on general principles of law that may or may not relate to your specific situation and does not constitute legal advice. I believe you should discuss the details of your specific case with an attorney. I am admitted in the States of Arizona and Idaho only. You should not rely on the information provided here in lieu of a personal consultation with a lawyer. Nothing in these communications creates an attorney-client relationship.