added and connected bitcoin core system module

src/system/machines/server/system.nix

@@ -2,7 +2,7 @@
 
 { system.stateVersion = "23.11";
 
-  imports = [ ../modules ];
+  imports = [ ../../modules ];
 
   users.users = {
     ${config.user.name} = {

src/system/modules/bitcoin/default.nix

@@ -0,0 +1,68 @@
+{ pkgs, lib, config, ... }:
+
+with lib;
+let
+  cfg = config.modules.system.bitcoin;
+  version = "27.0";
+
+  home = /var/lib/bitcoind;
+  #conf = pkgs.writeText "bitcoin.conf" (import ./config);
+
+
+in
+{ options.modules.system.bitcoin = { enable = mkEnableOption "system.bitcoin"; };
+  config = mkIf cfg.enable {
+    #nixpkgs.overlays = [
+    #  (final: prev: {
+    #    bitcoind = prev.bitcoind.overrideAttrs (old: {
+    #      src = fetchTarball {
+    #        url = ''
+    #          https://bitcoincore.org/bin/bitcoin-core-${version}/bitcoin-${version}-x86_64-linux-gnu.tar.gz
+    #        '';
+    #        sha256 = ''
+    #          sha256-05i4zrdwr2rnbimf4fmklbm1mrvxg1bnv3yrrx44cp66ba0nd3jg
+    #        '';
+    #      };
+    #    });
+    #  })
+    #];
+
+    users = {
+      users = {
+        "bitcoind" = {
+          inherit home;
+          description = "bitcoind system user";
+          isSystemUser = true;
+          group = "bitcoin";
+          createHome = true;
+        };
+      };
+      #groups = {
+      #  "bitcoin" = {
+      #    members = [
+      #    ];
+      #  };
+      #};
+    };
+
+    networking.firewall.allowedTCPPorts = [ 8333 ];
+
+    services.bitcoind = {
+      "bitcoind" = {
+        enable = true;
+        user = "bitcoind";
+        group = "bitcoin";
+        #configFile = conf;
+
+        rpc = {
+          port = 8332;
+          #users = {
+          #  config.user.name = {
+          #    passwordHMAC = "";
+          #  };
+          #};
+        };
+      };
+    };
+  };
+}

src/system/modules/default.nix

@@ -0,0 +1,5 @@
+{
+  imports = [
+    ./bitcoin
+  ];
+}