You don’t have to be an expert on digital currencies like bitcoin to be intrigued by the potential of the technology underlying them. Blockchain, as it’s called, is something new in computing. It mashes up cryptography and peer-to-peer networking to create what amounts to a shared database of transactions and other information—which can be open to all, controlled by no one. It’s not just for securely recording payments in crypto-coinage; a blockchain can handle complex transactions, even entire contracts. True believers say blockchain could reduce the need for businesses to organize as companies, which get work done via command and control. Using blockchain, they say, collaborators will be able to work together as free agents instead of under a hierarchy of bosses.