If you're using Guix System, you can use the cuirass.genenetwork.org substitute server completing the following:

1. Add https://cuirass.genenetwork.org to the list of substitute servers (using the substitute-urls field of guix-configuration passed to the guix-daemon service).

2. Adjust guix-daemon ACLs to include the following public key (using the authorized-keys field of guix-configuration passed to the guix-daemon service).

   (public-key
    (ecc
     (curve Ed25519)
     (q #9578AD6CDB23BA51F9C4185D5D5A32A7EEB47ACDD55F1CCB8CEE4E0570FBF961#)
     )
   )
   

   In the future, we hope to work with Guix maintainers to include this substitute server as one of the provided Guix System defaults.

When using Guix on a foreign distribution, you'll need to do the following to enable substitutes from cuirass.genenetwork.org:

1. Add the public key (provided above) for cuirass.genenetwork.org to the guix-daemon ACLs.

   sudo guix archive --authorize < cuirass.genenetwork.org.pub
   

2. Add the substitute url using the --substitute-urls option to guix-daemon. Assuming your foreign distribution uses systemd, this can be done using the following.

   sudo systemctl edit --full guix-daemon
   

   If you want to just use ci.guix.gnu.org, or cuirass.genenetwork.org for that matter, you'll need to adjust the substitute URLs configuration for the guix-daemon to just refer to the substitute servers you want to use. Once edited and saved, restart the guix daemon.

   sudo systemctl restart guix-daemon.service