They don't need to prove innocence. Under our legal system, a person is innocent until proven guilty. The onus is on the plaintiff to prove his allegations. The defendant then counter argues as to why he's not guilty of them.
If yours is ruled fake, you aren't a legitimate stockholder. Fake stock represents -0- ownership in a company. However, you can use that ruling to go after whoever you want.
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"We simply attempt to be fearful when others are greedy and to be greedy only when others are fearful."
-- Warren Buffett