> Unfortunately, this solves the wrong problem. Spending money usually involves getting a good or service in return, which inherently requires "trust" (as does any human interaction). Your fancy blockchain is not going to help you if you order something with Bitcoin and no package arrives.
That problem already has solutions. The problems cryptocurrency is supposed to solve are, I want to buy subversive literature from someone I already trust not to rip me off, or for an amount I'm not worried about losing, without anyone requiring me to give them a government ID. Or I want to sell it to people without requiring them to give anyone an ID. I want to donate money to Wikileaks. I want to commission art or software from someone in South America who doesn't have access to US banks. I have the same name as someone on a list and I want a way to move money without the government ruining my life. I live in an oppressive country and I want to finance the rebellion, or buy contraception or some other thing which is banned by the baddies when it ought not to be.
It's for doing the things where the existing system fails you, not the things where it works. But it can do those things too. Cash works the same way. You're not worried about a restaurant stealing your money because by the time you pay them you've already eaten. You're not worried about Newegg sending you a brick with "lol" written on it instead of a GPU because they're a well-known company and if they did that it would cost them more in damage to their reputation than they'd gain from the theft and people would sue them independent of payment method.
You don't always need your trust in other people to come from the payment system when it can come from a dozen other things instead.