Since blockchain first appeared in 2009 as the digital ledger for Bitcoin cryptocurrency transactions, it has steadily taken the online world by storm, in the process practically becoming a synonym for security. Even if a lot of people still don’t know what it is, they’re beginning to hear it more and more. IBM, for instance, has taken to mentioning “blockchain for security” in its TV ads. And in a sure sign of pending mainstream acceptance, a “Blockchain for Dummies” book is now available. […]