anchor.diff:  
     src = fetchurl {
       url = "https://download.electrum.org/${version}/Electrum-${version}.tar.gz";
  -    sha256 = "pAhsHKIMCB3OutJTrgGNT9PKfTcXcgxUj/x16uBK2Is=";
  +    sha256 = "sha256-vTZArTwbKcf6/vPQOvjubPecsg+h+QlZ6rdbl6qNfs0=";
     };
   
     postUnpack = ''
  
positive.code: }:
  
  let
    version = "4.3.1";
  
    libsecp256k1_name =
      if stdenv.isLinux then "libsecp256k1.so.0"
  
negative.code:     owner = "spesmilo";
      repo = "electrum";
      rev = version;
      sha256 = "sha256-z2/UamKmBq/5a0PTbHdAqGK617Lc8xRhHRpbCc7jeZo=";
  
      postFetch = ''
        mv $out ./all
  