This is just passing the overhead cost to whomever is mining the network though. The trustworthiness of a blockchain comes from it's ability to repel attacks w

This is just passing the overhead cost to whomever is mining the network though. The trustworthiness of a blockchain comes from it's ability to repel attacks with computing power, with more power meaning more trustiness. This means tremendous overhead for a blockchain that could just as easily be performed with the centralized system we have now.