anchor.diff:    src = fetchurl {
       urls = tarballUrls id version;
       hashOutput = false;
  -    multihash = "QmUCkePPFomf5KBJAHPNYfNtpNkGF7sDjeJ3CfXNhQtCvv";
  -    sha256 = "b22d32b018f6a1016adba91abfcc63876cca999daa472dd86e953ddd41d00905";
  +    multihash = "QmbPXMUFauSyofLi1Rn3mp52vhAoqYteQWqWdVEysh5AtP";
  +    sha256 = "ec7d0114016c788c1c09859c84860f6cec6c4595436d23245105154b9c046bb2";
     };
   
     nativeBuildInputs = optionals (!libOnly) [
  
positive.code: }:
  
  let
    id = "4179";
    version = "1.8.18";
  
    tarballUrls = id: version: [
      "https://alioth.debian.org/frs/download.php/file/${id}/pcsc-lite-${version}.tar.bz2"
  
negative.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "4203" "1.8.20";
        pgpsigUrls = map (n: "${n}.asc") (tarballUrls "4204" "1.8.20");
        pgpKeyFingerprint = "F5E1 1B9F FE91 1146 F41D  953D 78A1 B4DF E8F9 C57E";
        inherit (src) outputHashAlgo;
        outputHash = "b22d32b018f6a1016adba91abfcc63876cca999daa472dd86e953ddd41d00905";
  