diff --git a/hosts/chunk/attic.nix b/hosts/chunk/attic.nix
index 7749d79..14e1604 100644
--- a/hosts/chunk/attic.nix
+++ b/hosts/chunk/attic.nix
@@ -15,7 +15,7 @@
 
       storage = {
         type = "s3";
-        region = "default";
+        region = "auto";
         bucket = "cy7";
         endpoint = "https://e3e97aac307d106a7becea43cef8fcbd.r2.cloudflarestorage.com";
       };
diff --git a/hosts/common.nix b/hosts/common.nix
index 24c4556..0de34d5 100644
--- a/hosts/common.nix
+++ b/hosts/common.nix
@@ -5,6 +5,9 @@
       experimental-features = "nix-command flakes";
       auto-optimise-store = true;
       flake-registry = "";
+      trusted-users = [ "root" "@wheel" ];
+      trusted-public-keys = [ "central:zOr/tVH4EqkIgnClJJzYkHYHbCTtG1aUsA2OZjObAt0=" ];
+      substituters = [ "https://cache.cything.io" ];
     };
     channel.enable = false;
     optimise = {
@@ -17,6 +20,10 @@
       persistent = true;
       options = "--delete-older-than 14d";
     };
+    extraOptions = ''
+	    builders-use-substitutes = true
+	  '';
+
   };
   time.timeZone = "America/Toronto";
   networking.firewall.logRefusedConnections = false;