**Guest Speaker**: [Dave Harding](https://dtrt.org/) * Co-author of the Bitcoin Optech weekly [newsletter](https://bitcoinops.org/en/newsletters/) (2018-23), [Mastering Bitcoin, 3E](https://learning.oreilly.com/library/view/mastering-bitcoin-3rd/9781098150082/) (2023), 21.co Bitcoin Computer [tutorials](https://web.archive.org/web/20170606062213/https:/21.co/learn/) (2015-17),