You’ve probably heard about blockchain technology most often in the context of digital cryptocurrencies like Bitcoin, but the blockchain can be much more than that. In fact, the Defense Advanced Research Projects Agency (DARPA) is looking into an implementation of the blockchain that could fundamentally alter how sensitive military systems are secured. Blockchain technology could even help keep nuclear weapons safe and sound.
With Bitcoin, the blockchain is the universal record of all the transactions that take place. Although there are some ways to game the system in Bitcoin’s case, the blockchain is supposed to make sure bitcoins sent from one wallet to another are tracked and accounted for. That’s really all a blockchain is — a decentralized timeline of activity. Because of its distributed nature, it’s exceedingly difficult to modify data to hide activity, and that’s what makes blockchains so interesting in security. A centralized or distributed ledger is easier to hack.
http://www.extremetech.com/computing/237461-darpa-may-borrow-blockchain-tech-from-bitcoin-to-secure-military-networks
