[bmelton]

It's kind of naive to say that currencies are entirely based on belief, and I think you had it more right with your initial statement.

The only big distinction between the US Dollar and Bitcoin, from a practical perspective, is that Bitcoin doesn't have any armies willing to defend its status as legal tender. Even if everybody stopped 'believing' in the dollar, its buying power might tank, but it's still legally required to be accepted as payment for all debts, public and private. That legality is implemented through force of law, not good natured belief.