> Dear Mr. Federal Reserve Board Governor,
>
> If you want to see your pet poodle Fluffy again, encrypt the decisions
> of the next 3 board meetings to this public key (xxxyyyzzz...) and
> post to alt.ransom.payments before the decisions are made public.
Yeah, that works, but only against that one guy.
You can also commit the fraud against the owner of the coin issuing
bank/mint. Coerce (or blackmail) him into participating in the coin
withdrawal protocol without requiring a deposit. Payer untraceability
is all you need if you're the one doing the withdrawal.
If lots of banks issue their own coins, you have more victims (bankers) to
choose from. Plus, rich people in general often have close relationships
with a banker. They could be coerced into getting the banker to help
out by participating in the coin withdrawal protocol, while charging it
to the rich guy's account.