anchor.diff:    src = fetchurl {
       urls = tarballUrls id version;
       allowHashOutput = false;
  -    multihash = "QmSwpmpyLUHMuCYVzmjkYP17eKS1hJfwNHRu8Hzdaug5yr";
  -    sha256 = "d72b6f8654024f2a1d2de70f8f1d39776bd872870a4f453f436fd93d4312026f";
  +    multihash = "QmUCkePPFomf5KBJAHPNYfNtpNkGF7sDjeJ3CfXNhQtCvv";
  +    sha256 = "b22d32b018f6a1016adba91abfcc63876cca999daa472dd86e953ddd41d00905";
     };
   
     nativeBuildInputs = optionals (!libOnly) [
  
positive.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "4173" "1.8.17";
        pgpsigUrls = map (n: "${n}.asc") (tarballUrls "4174" "1.8.17");
        pgpKeyFingerprint = "F5E1 1B9F FE91 1146 F41D  953D 78A1 B4DF E8F9 C57E";
        inherit (src) outputHashAlgo;
        outputHash = "d72b6f8654024f2a1d2de70f8f1d39776bd872870a4f453f436fd93d4312026f";
      };
    };
  
  
negative.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"
  