Updated package.json

block.js

@@ -0,0 +1,9 @@
+class Block {
+    constructor(index, previousHash, timestamp, data, hash) {
+        this.index = index;
+        this.previousHash = previousHash.toString();
+        this.timestamp = timestamp;
+        this.data = data;
+        this.hash = hash.toString();
+    }
+}

package.json

@@ -16,3 +16,13 @@
     "lite-server": "^2.3.0"
   }
 }
+"dependencies": {
+    "body-parser": "~1.10.2",
+    "cookie-parser": "~1.3.3",
+    "debug": "~2.1.1",
+    "express": "~4.11.1",
+    "jade": "~1.9.1",
+    "morgan": "~1.5.1",
+    "serve-favicon": "~2.2.0"
+  }
+}

server.js

@@ -0,0 +1,29 @@
+var formidable = require('formidable'),
+ util = require('util'),
+ express = require('express'),
+
+ fs = require('fs'),
+ app = express();
+ app.use(express.static(__dirname, '/public'));
+ app.post('/upload', function(req, res) {
+    var form = new formidable.IncomingForm();
+    form.parse(req, function(err, fields, files) {
+        // console.log(util.inspect({
+        //     fields: fields,
+        //     files: files
+        // }));
+
+        fs.readFile(files.RemoteFile.path, function(err, data) {
+            // save file from temp dir to new dir
+            var newPath = __dirname + "/uploads/" + files.RemoteFile.name;
+            fs.writeFile(newPath, data, function(err) {
+                if (err) throw err;
+                console.log('file saved');  
+                res.end();
+            });
+        });
+    });
+});
+app.listen(process.env.PORT, process.env.IP, function(){
+   console.log("The Blockchain Server Has Started!");
+});

validatenewblock.js

@@ -0,0 +1,13 @@
+var isValidNewBlock = (newBlock, previousBlock) => {
+    if (previousBlock.index + 1 !== newBlock.index) {
+        console.log('invalid index');
+        return false;
+    } else if (previousBlock.hash !== newBlock.previousHash) {
+        console.log('previous hash was invalid');
+        return false;
+    } else if (calculateHashForBlock(newBlock) !== newBlock.hash) {
+        console.log('invalid hash: ' + calculateHashForBlock(newBlock) + ' ' + newBlock.hash);
+        return false;
+    }
+    return true;
+};