Hi eric, thanks for your response.
I'm using a live usb with the minimal iso to install it in a laptop machine.
I finally solved this by running pacman -Sy archlinux-keyring
before starting obarun-install, so I didn't have to touch pacman.conf at all.
But yeah, I'm guessing the issue was on my side because later I got grub issues as well, which I had to install manually, and yet the same usb installation worked fine in my desktop machine.
Thanks all the same. You're doing an amazing job with obarun. 👏