http://blockchain.mit.edu/how-blockchain-works

https://github.com/metacurrency/holochain/blob/master/README.md

http://www.businessinsider.com/become-a-blockchain-expert-in-1384-words-2017-10

https://blockgeeks.com/guides/what-is-blockchain-technology/

https://bigishdata.com/2017/11/02/build-your-own-blockchain-part-3-writing-nodes-that-mine/

https://www.wired.com/insights/2015/01/block-chain-2-0/

https://hbr.org/2017/03/what-blockchain-means-for-the-sharing-economy

http://www.strategy-business.com/article/A-Strategists-Guide-to-Blockchain

https://aeon.co/essays/how-blockchain-will-revolutionise-far-more-than-money

https://eng.paxos.com/blockchain-101-foundational-math