Nice summary. Appreciate the visuals.

Timely post for me as I've literally been writing a lean toolkit to be able to do all kinds of operations on xpubs, derive pubkeys/addresses, etc.

It's for personal usecases and at the same time to learn about the cryptography side of things more intimately, beyond just understanding the conceptual and letting wallet software or high level third party libraries do their magic.

Might have to rabbithole into your content now.

Bonus: useful if all wallet apps go bust :P

Have some sats, cheers