Last night after reading about the Parity Multi Sig attack I decided to finally try and read up on this subject, but quickly got annoyed with all the 'how bitcoin/blockchain works' videos that repeat the same high level points without scratching any of my technical itches. That was until I found this very concise gem of an introduction:
http://www.imponderablethings.com/2013/07/how-bitcoin-works-...
Via. https://blog.zeppelin.solutions/the-hitchhikers-guide-to-sma...