arch linux – How do I handle PGP issues when installing gnome

I have just finished a fresh installation of Arch Linux in the same way I have many times, and in accordance with the Arch Linux installation wiki. I am trying to install gnome and am using the command pacman -S gnome as a super user. I get the following errors when I install gnome;

error: libspeech: signature from "Alexander Epaneshikov <email@alex19ep.me>" is unknown trust
Do you want to delete it [Y/n]
error: speechdispatcher: signature from "Alexander Epaneshnikov <email@alex19ep.me>" is unknown trust
Do you want to delete it [Y/n]
error: failed to commit transaction (invalid or corrupted package)
Errors occurred, no packages were upgraded

I have to imagine I am not the only person trying to download gnome that is getting this error. are these packages that can be merely ignored, or do I need to find a solution to these failed downloads?