I've written and recorded the new episode 02.1 of "making minipgp6".
It covers reading and writing the contents of OpenPGP v6 public key packets.
https://codeberg.org/minipgp6/making#2-verifying-detached-data-signatures
Once completed, chapter 2 will cover cryptographic verification of detached OpenPGP data signatures.
(I'm writing the script for episode 02.2 now - it will cover Signature packets)