> You may not mind yourself -- Visa is useful -- but adding this kind of closure isn't cost-free (look at Wikileaks) and the fundamental innovation in how to do this without introducing any trusted third parties is a big deal.

A Bitcoin transaction costs a few hundred dollars once you price in both the direct transaction fees and the socialized fees (block reward). I'll stick with Visa.

note: Of course Bitcoin still has trusted third parties - just lots of them.