anchor.diff:    passthru = {
       srcVerification = fetchurl rec {
         failEarly = true;
  -      pgpsigUrls = map (n: "${n}.asc") (tarballUrls "4219");
  +      pgpsigUrls = map (n: "${n}.asc") (tarballUrls "4231");
         pgpKeyFingerprint = "F5E1 1B9F FE91 1146 F41D  953D 78A1 B4DF E8F9 C57E";
         inherit (src) urls outputHashAlgo outputHash;
       };
  
positive.code:   inherit name;
  
    src = fetchurl {
      urls = tarballUrls "4218";
      hashOutput = false;
      multihash = "QmVhzTQMANuMwnCjkn3uwm4G5TQEGwAAFPyRfKHf8XQqWh";
      sha256 = "a660e269606986cb94840ad5ba802ffb0cd23dd12b98f69a35035e0deb9dd137";
    };
  
    nativeBuildInputs = [
  
negative.code: }:
  
  let
    name = "ccid-1.4.28";
  
    tarballUrls = id: [
      "https://alioth.debian.org/frs/download.php/file/${id}/${name}.tar.bz2"
  