It would be /var/opt/nix since it's data. Payload in /opt/nix and configuration ...

		Annatar on Feb 11, 2020 \| parent \| context \| favorite \| on: I Was Wrong about Nix It would be /var/opt/nix since it's data. Payload in /opt/nix and configuration in /etc/opt/nix. That's what the specification states.