Content:
http://www.8btc.com/blockchain

Explanation:
https://www.zhihu.com/question/37290469

Extension:
http://www.8btc.com/core-vs-classic

Contract:
http://www.8btc.com/bitcoin_contracts
Contract Ethernum
https://github.com/ethereum/wiki/wiki/%5B%E4%B8%AD%E6%96%87%5D-%E4%BB%A5%E5%A4%AA%E5%9D%8A%E7%99%BD%E7%9A%AE%E4%B9%A6
http://ethfans.org/posts/blockchain-slides

Flaw:
big int
http://8btc.com/thread-23642-1-1.html
https://bitcointalk.org/index.php?topic=822.0
51%
http://www.8btc.com/51attack

BTC faq:
https://bitcoin.org/zh_CN/faq

Coursera(Princeton University):
https://www.coursera.org/learn/cryptocurrency

DAO:
https://github.com/ethereum/wiki/wiki/%5B%E4%B8%AD%E6%96%87%5D-%E4%BB%A5%E5%A4%AA%E5%9D%8A%E7%99%BD%E7%9A%AE%E4%B9%A6#%E5%8E%BB%E4%B8%AD%E5%BF%83%E5%8C%96%E8%87%AA%E6%B2%BB%E7%BB%84%E7%BB%87

應用發展:
https://zhuanlan.zhihu.com/p/21292059
Factom: http://factom.org/