So blockchains make sense for databases that are shared by multiple writers who don’t entirely trust each other, and who modify that database directly. But that’s still not enough. Blockchains truly shine where there is some interaction between the transactions created by these writers.
— Avoiding the pointless blockchain project | MultiChain http://www.multichain.com/blog/2015/11/avoiding-pointless-blockchain-project/
This article has some of the best thinking I’ve seen about how to figure out what to do with blockchain. Blockchain all the things really isn’t a good idea here. This is a complex set of technologies that have any number of useful applications, but, like any tool, it needs to used properly.