If you need proof that cryptocurrencies are evil, here's Tim May, one of the idiological grand-pappies of bitcoin writing about one possible use for cryptocurrency in the Cyphernomicon:

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16.10.4. Will I be sad if anonymous methods allow untraceable markets for assassinations? It depends. In many cases, people deserve death--those who have escaped justice, those who have broken solemn commitments, etc. Gun grabbing politicians, for example should be killed out of hand. Anonymous rodent removal services will be a tool of liberty. The BATF agents who murdered Randy Weaver's wife and son should be shot. If the courts won't do it, a market for hits will do it. - (Imagine for a moment an "anonymous fund" to collect the money for such a hit. Interesting possibilities.) - "Crypto Star Chambers," or what might be called "digilantes," may be formed on-line, and untraceably, to mete out justice to those let off on technicalities. Not altogether a bad thing.

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If I believed in hell, I'd wish that Tim May was rotting in it.