Understanding Bitcoin Source 21

**This will be the last session we'll have for Understanding Bitcoin Source before taking an indefinite break. Let me know if you'd be interested in a season 2!** Understanding Bitcoin Source (UBS) is a Socratic style seminar where we’ll dive into different aspects of the Bitcoin protocol and it’s relevant source code. Bitcoin Core will be used as our reference while the examination of other implementations, such as btcd and the unmaintained bitcore, will also serve as study material. For this s…