Maybe this sets up the exchange idk....

hosts/kvernberg/configuration.nix

@@ -5,8 +5,9 @@
     ./hardware-configuration.nix
     (fp /base)
     (fp /misc/metrics-exporters.nix)
-
     ./disks.nix
+
+    ./services/pvvvvvv
   ];
 
   sops.defaultSopsFile = fp /secrets/kvernberg/kvernberg.yaml;

hosts/kvernberg/services/pvvvvvv/default.nix

@@ -0,0 +1,11 @@
+{
+  imports = [
+    ./exchange.nix
+  ];
+
+  services.taler = {
+    settings = {
+      taler.CURRENCY = "SCHPENN";
+    };
+  };
+}

hosts/kvernberg/services/pvvvvvv/exchange.nix

@@ -0,0 +1,38 @@
+{ config, lib, fp, pkgs, ... }:
+let
+  cfg = config.services.taler;
+  inherit (cfg.settings.taler) CURRENCY;
+in {
+  sops.secrets.exchange-offline-master = {
+    format = "binary";
+    sopsFile = fp /secrets/kvernberg/exhange-offline-master.priv;
+  };
+
+  services.taler.exchange = {
+    enable = true;
+    debug = true;
+    openFirewall = true;
+    denominationConfig = ''
+      [COIN-${CURRENCY}-k1-1-0]
+      VALUE = ${CURRENCY}:1
+      DURATION_WITHDRAW = 7 days
+      DURATION_SPEND = 1 years
+      DURATION_LEGAL = 3 years
+      FEE_WITHDRAW = ${CURRENCY}:0
+      FEE_DEPOSIT = ${CURRENCY}:0
+      FEE_REFRESH = ${CURRENCY}:0
+      FEE_REFUND = ${CURRENCY}:0
+      RSA_KEYSIZE = 2048
+      CIPHER = RSA
+    '';
+    settings = {
+      exchange = {
+        MASTER_PUBLIC_KEY = "J331T37C8E58P9CVE686P1JFH11DWSRJ3RE4GVDTXKES9M24ERZG";
+        BASE_URL = "http://kvernberg.pvv.ntnu.no:8081/";
+      };
+      exchange-offline = {
+        MASTER_PRIV_FILE = config.sops.secrets.exchange-offline-master.path;
+      };
+    };
+  };
+}