anchor.diff:    src = fetchurl {
       url = "${baseUrl}/${name}.tar.xz";
       hashOutput = false;
  -    sha256 = "9d3a3c7033293e0c97f0ad0501fd5b4d4913ae497cbf70cca06633ccc54b5734";
  +    sha256 = "a0f72ca2c824a5a555dc8924413dfe947eca23ab2e30bcff54eaafefe5fe301d";
     };
   
     buildInputs = [
  
positive.code: 
  let
    channel = "2.0";
    version = "${channel}.4";
  
    baseUrl = "mirror://kernel/linux/utils/cryptsetup/v${channel}";
  in
  
negative.code:   passthru = {
      srcVerification = fetchurl {
        failEarly = true;
        inherit (src)
          urls
          outputHash
          outputHashAlgo;
        fullOpts = {
          pgpDecompress = true;
          pgpsigUrl = "${baseUrl}/${name}.tar.sign";
          pgpKeyFingerprint = "2A29 1824 3FDE 4664 8D06  86F9 D9B0 577B D93E 98FC";
        };
      };
    };
  
  