https://github.com/bitcoinbook/bitcoinbook/blob/develop/book.asciidoc
https://github.com/bitcoin/bips
https://github.com/bitcoin/bips/blob/master/bip-0018.mediawiki
https://bitcoin.org/en/developer-guide#block-chain
https://en.bitcoin.it/wiki/Bitcoin_Core_0.11_(ch_1):_Overview
https://www.gitbook.com/@programmingblockchain
https://en.bitcoin.it/wiki/Category:Technical
https://en.bitcoin.it/wiki/Help:FAQ
https://en.bitcoin.it/wiki/Protocol_rules
https://en.bitcoin.it/wiki/Main_Page
https://en.bitcoin.it/wiki/Help:Introduction
http://www.michaelnielsen.org/ddi/how-the-bitcoin-protocol-actually-works/
https://bitcoinbook.info/wp-content/translations/cmn/book.pdf
https://arstechnica.com/tech-policy/2017/12/how-bitcoin-works/
http://www.youdzone.com/signature.html
http://www.righto.com/2014/02/bitcoins-hard-way-using-raw-bitcoin.html
https://arstechnica.com/tech-policy/2017/12/bitcoin-a-beginners-guide/
https://www.gitbook.com/book/yeasy/blockchain_guide/details
https://www.raydbg.com/2018/Understand-Blockchain-and-Bitcoin/?from=groupmessage&isappinstalled=0
MATH