Trying to Update UwU

I just installed Nyarch on a ThinkPad T480s and I'm getting the error

'libngtcp2: signature from "kpcyrd git@rxv.cc" is unknown trust
:: File /var/cache/pacman/pkg/libngtcp2-1.17.0-1-x86_64.pkg.tar.zst is corrupted (invalid or corrupt package (PGP signature)).

Any idea on what I should do?