{
  nix = {
    settings = {
      substituters = [
        "https://helix.cachix.org"
      ];
      trusted-public-keys = [
        "helix.cachix.org-1:ejp9KQpR1FBI2onstMQ34yogDm4OgU2ru6lIwPvuCVs="
      ];
    };
  };
}