.

flake.nix

@@ -1,3 +1,28 @@
+{
+  description = "BTCPay server, NBXplorer, Bitcoin Core, etc. as a NixOS system/container image";
+
+  inputs = {
+    nix-bitcoin.url = "github:fort-nix/nix-bitcoin/release";
+    nixpkgs.follows = "nix-bitcoin/nixpkgs";
+    nixos-generators.url = "github:nix-community/nixos-generators";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    nix-bitcoin,
+    nixos-generators,
+    flake-utils,
+    ...
+  }: let
+    system = "x86_64-linux";
+    pkgs = import nixpkgs {inherit system;};
+  in {
+    nixosConfigurations.btc-pay-server = nixpkgs.lib.nixosSystem {
+      inherit system;
+      modules = [
+        nix-bitcoin.nixosModules.default
         ({
           config,
           pkgs,
@@ -91,3 +116,24 @@
           # State version
           system.stateVersion = "25.05";
         })
+      ];
+    };
+
+    # Your devShell remains the same
+    devShells = flake-utils.lib.eachDefaultSystem (
+      system: let
+        pkgs = import nixpkgs {inherit system;};
+      in {
+        default = pkgs.mkShell {
+          buildInputs = [
+            nixos-generators.packages.${system}.nixos-generate
+            pkgs.just
+          ];
+          shellHook = ''
+            echo "💚 Devshell ready: nixos-generate, just available."
+          '';
+        };
+      }
+    );
+  };
+}