zamanibitcoin on Nostr: Good catch, adding it. Bitcoin duplicates the last hash at any odd level, so a 3-tx ...

Good catch, adding it. Bitcoin duplicates the last hash at any odd level, so a 3-tx block still builds a 2-level tree. I'll also put a one-line footnote that this duplication is why CVE-2012-2459 existed (two different tx lists could give the same root), so readers don't assume "same root = same list" when they draw their own trees.