{
  nix = {
    settings = {
      substituters = [
        "https://numtide.cachix.org"
      ];
      trusted-public-keys = [
        "numtide.cachix.org-1:2ps1kLBUWjxIneOy1Ik6cQjb41X0iXVXeHigGmycPPE="
      ];
    };
  };
}