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Blockchain networks take a different approach. Recall that blockchains put software in charge, inverting the traditional relationship between hardware and software. This allows network designers to take full advantage of the expressivity of software. They can engineer blockchain networks to have persistent rules encoded in software that are resilient to changes in the underlying hardware. The rules can cover every aspect of the network, including who gets access, who pays fees, how much gets charged, how economic incentives are allocated, and who can modify the network under what circumstances. Blockchain network designers write the core network software but don’t need to worry about nodes in the network turning evil and undermining the system. They can instead rely on built-in consensus mechanisms to keep nodes in check.