3268 changes the default network from Bitcoin testnet to Bitcoin mainnet. Also included is our regular section about notable changes to popular Bitcoin infrastructure projects. This week’s newsletter requests help testing the next version of LND, summarizes a discussion about soft fork activation mechanisms, and describes a few notable changes to popular Bitcoin infrastructure software. Independent code archaeology by Gregory Maxwell indicates that the main culprit was probably the BitPay Bitcore software which introduced a bug around July 2014 and released a fix about a month later. ● Publication of videos and study material from schnorr/taproot workshop: Optech published a blog post with links to videos, Jupyter notebooks, GitHub repositories, and more information produced for the schnorr and taproot workshops held in San Francisco and https://youtu.be/yyUiB7kcQls New York City last month.