anchor.diff:  
     pytestFlagsArray = [ "electrum/tests" ];
   
  -  disabledTests = [
  -    "test_loop"  # test tries to bind 127.0.0.1 causing permission error
  -  ];
  -
     postCheck = ''
       $out/bin/electrum help >/dev/null
     '';
  
positive.code: }:
  
  let
    version = "4.3.0";
  
    libsecp256k1_name =
      if stdenv.isLinux then "libsecp256k1.so.0"
  
negative.code: 
    src = fetchurl {
      url = "https://download.electrum.org/${version}/Electrum-${version}.tar.gz";
      sha256 = "pAhsHKIMCB3OutJTrgGNT9PKfTcXcgxUj/x16uBK2Is=";
    };
  
    postUnpack = ''
  