I published episode 02.3 of "making minipgp6"
https://codeberg.org/minipgp6/making
The new episode covers cryptographic verification of OpenPGP "detached data signatures":
https://codeberg.org/minipgp6/making/src/branch/main/02.3-signatures_1.md
The next episode will cover adding support for ML-DSA-65+Ed25519 from RFC 9980.
The full video series, including this episode, is available on https://clip.place/c/minipgp6/videos
(Many thanks to @nlnet for supporting this project!)