anchor.diff:    src = fetchurl {
       urls = tarballUrls version;
       hashOutput = false;
  -    sha256 = "f7c139a0c77a1f0012619003e542060ba8f94799a0ef463026db390680e4d798";
  +    sha256 = "4b34e92ae36fa493e0d94366c767f06d5f9951e3d8581d10fd935d738db1574d";
     };
   
     buildInputs = [
  
positive.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "0.23.15";
        fullOpts = {
          pgpsigUrls = map (n: "${n}.sig") urls;
          pgpKeyFingerprints = [
  
negative.code: }:
  
  let
    version = "0.23.16.1";
  
    tarballUrls = version: [
      "https://github.com/p11-glue/p11-kit/releases/download/${version}/p11-kit-${version}.tar.gz"
  