{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
  };

  outputs = { self, nixpkgs, ... }:
    let
      system = "x86_64-linux";
    in {
      nixosConfigurations.tobserver = nixpkgs.lib.nixosSystem {
        inherit system;
        modules = [
          ./hardware-configuration.nix
          ./configuration.nix
          ./modules/bitcoin.nix
          ./modules/electrs.nix
          ./modules/mempool.nix
          ./modules/nextcloud.nix
          ./modules/totap.nix
        ];
      };
    };
}