[cortesoft]

The blockchain only solves the trust problem ON THE CHAIN itself. However, everything useful is going to involve something off chain, at which point we are back to having a trust problem.

Take, for example, the simplest use of currency... I want to buy an item that someone else is selling. The blockchain can verify that the buyer has sent the seller money, but it can’t verify that the thing the person bought isn’t defective. It can’t even verify that that person even delivers the item to me. It can’t verify that the item isn’t stolen.

Credit cards can help remedy the situation for all of those things.