One or more PGP signatures could not be verified

  
gpg -recv-key <KEYID>

https://bbs.archlinux.org/viewtopic.php?id=191954

Two PGP Keyrings for Package Management in Arch Linux

http://allanmcrae.com/2015/01/two-pgp-keyrings-for-package-management-in-arch-linux/embed/#?secret=zQHTu5bbvd