Comment for hardcoding diff

lib/algoProperties.js

@@ -4,6 +4,8 @@ var util = require('./util.js');
 
 var algos = module.exports = global.algos = {
     sha256: {
+        //Uncomment diff if you want to use hardcoded truncated diff
+        //diff: new Buffer('00000000ffff0000000000000000000000000000000000000000000000000000', 'hex'),
         shift: 32,
         multiplier: Math.pow(2, 32),
         hash: function(){