Good point, I'll update the pinned comment since we can't use signed commits any more.
Also, to clear up any confusion about the discrepancy in key IDs -- 7C9EDC0F13A4F15D is a subkey of 40481E7B8FCF9CEC. You need to import the primary key, which is trusted by makepkg due to it's inclusion in the validpgpkeys array.
Pinned Comments
WorMzy commented on 2021-03-02 16:19 (UTC) (edited on 2022-08-03 21:12 (UTC) by WorMzy)
The following key is used to sign release commits:
40481E7B8FCF9CEC
Import it into your keyring however you want.
https://wiki.archlinux.org/index.php/GnuPG#Import_a_public_key