Please, though Chaotic has HTTPS, never suggest this.
@siapa, looks like you (or some app) recreated your pacman-keyring and forgot to populate chaotic.
The solution is to recreate it once more, and with all the populates:
sudo rm -rf /etc/pacman.d/gnupg
sudo pacman-key --init
sudo pacman-key --populate archlinux
sudo pacman-key --populate chaotic
# repeate this last command with other repos you may have added.
You can check for other available repo's keyrings to populate in /usr/share/pacman/keyrings/