Blockchain
Blockchain Revolution: How the Technology Behind Bitcoin and Other Cryptocurrencies is Changing the World
amazon.com

Blockchains loosen up trust, which has been in the hands of central institutions (e.g., banks, policy makers, clearinghouses, governments, large corporations), and allows it to evade these old control points. For example, what if counterparty validation can be done on the blockchain, instead of by a clearinghouse?
