anchor.diff:    ###### implementation
   
     config = {
  +
  +    nix.binaryCachePublicKeys = [ "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" ];
   
       environment.etc."nix/nix.conf".source = nixConf;
   
  
positive.code:         '';
        };
  
      };
  
    };
  
negative.code:         build-chroot-dirs = ${toString cfg.chrootDirs} /bin/sh=${sh} $(echo $extraPaths)
          binary-caches = ${toString cfg.binaryCaches}
          trusted-binary-caches = ${toString cfg.trustedBinaryCaches}
          binary-cache-public-keys = ${toString cfg.binaryCachePublicKeys}
          ${optionalString cfg.requireSignedBinaryCaches ''
            signed-binary-caches = *
          ''}
          $extraOptions
          END
        '';
  