Depending on what you mean by money, there are unsolved problems. You need some kind of layer that maps real people to accounts, or people can just create lots

Depending on what you mean by money, there are unsolved problems. You need some kind of layer that maps real people to accounts, or people can just create lots of accounts for unlimited money. There was some crypto startup that wanted to do this and was going to different cities and doing retina scans. I wonder what happened to them? I suppose you could outsource it by donating to GiveDirectly, but that would require conversion to real money and then (by GiveDirectly) to mobile phone payments. In that case, the cryptocurrency isn't solving much of the problem.