How to kill bitcoin:
1. Declare it illegal within a country. Local banks can't cooperate with exchanges and it makes buying bitcoins more difficult.
2. If 1 is not possible, require users to hand over passport/driver's license info to trade. Many people feel uncomfortable with this (hello MtGox).
3. Declare bitcoins a commodity for tax purposes. This means calculating capital gains tax every time the user buys or sells. Accounting nightmare for most people.
4. Launch campaign against bitcoin stating it's used for little else but trading drugs, child porn, and funding terrorism.
5. Ask the NSA to build a mining cluster and launch a 51% attack. Instantly force the value of everyone's bitcoins to zero as no one will want to trade a commodity that is invalidated by a third party.
#5 is the nuclear option. Don't see it happening unless whole countries start using bitcoin and the USD$ is threatened.
This is excellent concept seem like all can happen in some sort of scenario only which one.
Hope that no of this will happen
