anchor.diff:    src = fetchurl {
       urls = map (n: "${n}/node-v${version}.tar.xz") dirUrls;
       hashOutput = false;
  -    sha256 = "0bdd8d1305777cc8cd206129ea494d6c6ce56001868dd80147aff531d6df0729";
  +    sha256 = "e16c3c76c2d6756bbfd711189cbdaf5676049b443e6817007bb537f243ca899a";
     };
   
     nativeBuildInputs = [
  
positive.code: }:
  
  let
    version = "6.9.1";
  
    dirUrls = [
      "https://nodejs.org/dist/v${version}"
  
negative.code:       sha256Urls = map (n: "${n}/SHASUMS256.txt.asc") dirUrls;
        #pgpsigSha256Urls = map (n: "${n}.asc") sha256Urls;
        pgpKeyFingerprints = [
          # Rod Vagg
          "DD8F 2338 BAE7 501E 3DD5  AC78 C273 792F 7D83 545D"
          # Evan Lucas
          "B9AE 9905 FFD7 803F 2571  4661 B63B 535A 4C20 6CA9"
          # Jeremiah Senkpiel
          "FD3A 5288 F042 B685 0C66  B31F 09FE 4473 4EB7 990E"
          # Colin Ihrig
          "94AE 3667 5C46 4D64 BAFA  68DD 7434 390B DBE9 B9C5"
          # Myles Borins
          "C4F0 DFFF 4E8C 1A82 3640  9D08 E73B C641 CC11 F4C8"
          # James M Snell
          "71DC FD28 4A79 C3B3 8668  286B C97E C7A0 7EDE 3FC1"
        ];
        inherit (src) urls outputHash outputHashAlgo;
      };
  