Guys,
I'm reposting my comment from another thread as it is relevant to this thread as well.
The pseudo-anonymous nature of bitcoin will prevent anyone from legally claiming that they lost it.
So, even genuine losses like hacks cannot be offset as losses for tax purposes. What effect this will have on bitcoin as a store of wealth is something unknown.
You're thinking too far ahead.
They have to prove you have them first.
If I'm a genuine business accepting bitcoins, paying my taxes and doing due diligence, then my addresses will be public knowledge. I don't understand what you're trying to say.
Imagine an anarcho-capitalist scenario, insurance covers damages and competitive courts act as arbitrers. Even there, I will not be able to genuinely claim I have been hacked as no one can genuinely say that the hackers address is not something I'm controlling with a sock-puppet. In the case of other stores of value, I can.