- Remove appendix dedicated to `bx`. They had already been slated for
deletion, as I wrote to a reviewer on 2023-07-27: "I'm also probably
going to delete the library/tool focused appendixes as I don't think
they add anything". After the disclosure of CVE-2023-39910 on August
8th, it's clear that this appendix was worse than useless: it was
harmful.
- Remove other mentions of `bx` in the book. I had not previously
intended this because it looked like a pain, but mentions of a tool
often come across as endorsements to readers and no tool created by
the team behind Libbitcoin is one I would ever want to endorse. I
regret that I didn't remove the mentions earlier in the process of
updating the book.
- Remove appendix dedicated to pycoin. I'm now aware of any problems
with pycoin, but I don't think these sort of short detached tutorials
add anything. Programming Bitcoin is an entire book built on pycoin,
and all of these tools have their own webpages that get updated more
frequently than the book.