diff --git a/bin/remixd.ts b/bin/remixd.ts
index 0308228884..c65e840a15 100644
--- a/bin/remixd.ts
+++ b/bin/remixd.ts
@@ -23,11 +23,10 @@ console.log('\x1b[33m%s\x1b[0m', '[WARN] You may now only use IDE at ' + program
 if (program.sharedFolder) {
   console.log('\x1b[33m%s\x1b[0m', '[WARN] Any application that runs on your computer can potentially read from and write to all files in the directory.')
   console.log('\x1b[33m%s\x1b[0m', '[WARN] Symbolic links are not forwarded to Remix IDE\n')
-  const remixdClient = new RemixdClient()
-  const websocketHandler = new WebSocket(65520, { remixIdeUrl: program.remixIde }, remixdClient)
+  const websocketHandler = new WebSocket(65520, { remixIdeUrl: program.remixIde }, new RemixdClient())
 
   websocketHandler.start()
-  killCallBack.push(websocketHandler.close)
+  killCallBack.push(websocketHandler.close.bind(websocketHandler))
 }
 
 // kill
diff --git a/lib/bin/remixd.d.ts b/lib/bin/remixd.d.ts
deleted file mode 100644
index b7988016da..0000000000
--- a/lib/bin/remixd.d.ts
+++ /dev/null
@@ -1,2 +0,0 @@
-#!/usr/bin/env node
-export {};
diff --git a/lib/bin/remixd.js b/lib/bin/remixd.js
deleted file mode 100755
index 8107adc8aa..0000000000
--- a/lib/bin/remixd.js
+++ /dev/null
@@ -1,42 +0,0 @@
-#!/usr/bin/env node
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });
-var websocket_1 = require("../src/websocket");
-var remixdClient_1 = require("../src/services/remixdClient");
-var program = require('commander');
-program
-    .usage('-s <shared folder>')
-    .description('Provide a two-way connection between the local computer and Remix IDE')
-    .option('--remix-ide  <url>', 'URL of remix instance allowed to connect to this web sockect connection')
-    .option('-s, --shared-folder <path>', 'Folder to share with Remix IDE')
-    .option('--read-only', 'Treat shared folder as read-only (experimental)')
-    .on('--help', function () {
-    console.log('\nExample:\n\n    remixd -s ./ --remix-ide http://localhost:8080');
-}).parse(process.argv);
-var killCallBack = [];
-if (!program.remixIde) {
-    console.log('\x1b[31m%s\x1b[0m', '[ERR] URL Remix IDE instance has to be provided.');
-}
-console.log('\x1b[33m%s\x1b[0m', '[WARN] You may now only use IDE at ' + program.remixIde + ' to connect to that instance');
-if (program.sharedFolder) {
-    console.log('\x1b[33m%s\x1b[0m', '[WARN] Any application that runs on your computer can potentially read from and write to all files in the directory.');
-    console.log('\x1b[33m%s\x1b[0m', '[WARN] Symbolic links are not forwarded to Remix IDE\n');
-    var remixdClient = new remixdClient_1.default();
-    var websocketHandler = new websocket_1.default(65520, { remixIdeUrl: program.remixIde }, remixdClient);
-    websocketHandler.start();
-    killCallBack.push(websocketHandler.close);
-}
-// kill
-function kill() {
-    for (var k in killCallBack) {
-        try {
-            killCallBack[k]();
-        }
-        catch (e) {
-            console.log(e);
-        }
-    }
-}
-process.on('SIGINT', kill); // catch ctrl-c
-process.on('SIGTERM', kill); // catch kill
-process.on('exit', kill);
diff --git a/lib/src/index.d.ts b/lib/src/index.d.ts
deleted file mode 100644
index e69de29bb2..0000000000
diff --git a/lib/src/index.js b/lib/src/index.js
deleted file mode 100644
index 84996a9542..0000000000
--- a/lib/src/index.js
+++ /dev/null
@@ -1,8 +0,0 @@
-'use strict';
-module.exports = {
-    Router: require('./router'),
-    utils: require('./utils'),
-    services: {
-        sharedFolder: require('./services/sharedFolder')
-    }
-};
diff --git a/lib/src/services/remixdClient.d.ts b/lib/src/services/remixdClient.d.ts
deleted file mode 100644
index 016ddd9fcc..0000000000
--- a/lib/src/services/remixdClient.d.ts
+++ /dev/null
@@ -1,42 +0,0 @@
-import WebSocket from '../websocket';
-import { PluginClient } from '@remixproject/plugin';
-export default class RemixdClient extends PluginClient {
-    trackDownStreamUpdate: {
-        [key: string]: string;
-    };
-    websocket: WebSocket | null;
-    currentSharedFolder: string;
-    readOnly: boolean;
-    setWebSocket(websocket: WebSocket): void;
-    sharedFolder(currentSharedFolder: string, readOnly: boolean): void;
-    list(args: {
-        [key: string]: string;
-    }, cb: Function): void;
-    resolveDirectory(args: {
-        [key: string]: string;
-    }, cb: Function): void;
-    folderIsReadOnly(args: {
-        [key: string]: string;
-    }, cb: Function): any;
-    get(args: {
-        [key: string]: string;
-    }, cb: Function): any;
-    exists(args: {
-        [key: string]: string;
-    }, cb: Function): void;
-    set(args: {
-        [key: string]: string;
-    }, cb: Function): any;
-    rename(args: {
-        [key: string]: string;
-    }, cb: Function): any;
-    remove(args: {
-        [key: string]: string;
-    }, cb: Function): any;
-    isDirectory(args: {
-        [key: string]: string;
-    }, cb: Function): void;
-    isFile(args: {
-        [key: string]: string;
-    }, cb: Function): void;
-}
diff --git a/lib/src/services/remixdClient.js b/lib/src/services/remixdClient.js
deleted file mode 100644
index 194c819e43..0000000000
--- a/lib/src/services/remixdClient.js
+++ /dev/null
@@ -1,157 +0,0 @@
-"use strict";
-var __extends = (this && this.__extends) || (function () {
-    var extendStatics = function (d, b) {
-        extendStatics = Object.setPrototypeOf ||
-            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
-        return extendStatics(d, b);
-    };
-    return function (d, b) {
-        extendStatics(d, b);
-        function __() { this.constructor = d; }
-        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
-    };
-})();
-Object.defineProperty(exports, "__esModule", { value: true });
-var plugin_1 = require("@remixproject/plugin");
-var utils = require('../utils');
-var isbinaryfile = require('isbinaryfile');
-var fs = require('fs-extra');
-var RemixdClient = /** @class */ (function (_super) {
-    __extends(RemixdClient, _super);
-    function RemixdClient() {
-        return _super !== null && _super.apply(this, arguments) || this;
-    }
-    RemixdClient.prototype.setWebSocket = function (websocket) {
-        this.websocket = websocket;
-    };
-    RemixdClient.prototype.sharedFolder = function (currentSharedFolder, readOnly) {
-        this.currentSharedFolder = currentSharedFolder;
-        this.readOnly = readOnly;
-    };
-    RemixdClient.prototype.list = function (args, cb) {
-        try {
-            cb(null, utils.walkSync(this.currentSharedFolder, {}, this.currentSharedFolder));
-        }
-        catch (e) {
-            cb(e.message);
-        }
-    };
-    RemixdClient.prototype.resolveDirectory = function (args, cb) {
-        try {
-            var path_1 = utils.absolutePath(args.path, this.currentSharedFolder);
-            cb(null, utils.resolveDirectory(path_1, this.currentSharedFolder));
-        }
-        catch (e) {
-            cb(e.message);
-        }
-    };
-    RemixdClient.prototype.folderIsReadOnly = function (args, cb) {
-        return cb(null, this.readOnly);
-    };
-    RemixdClient.prototype.get = function (args, cb) {
-        var path = utils.absolutePath(args.path, this.currentSharedFolder);
-        if (!fs.existsSync(path)) {
-            return cb('File not found ' + path);
-        }
-        if (!isRealPath(path, cb))
-            return;
-        isbinaryfile(path, function (error, isBinary) {
-            if (error)
-                console.log(error);
-            if (isBinary) {
-                cb(null, { content: '<binary content not displayed>', readonly: true });
-            }
-            else {
-                fs.readFile(path, 'utf8', function (error, data) {
-                    if (error)
-                        console.log(error);
-                    cb(error, { content: data, readonly: false });
-                });
-            }
-        });
-    };
-    RemixdClient.prototype.exists = function (args, cb) {
-        var path = utils.absolutePath(args.path, this.currentSharedFolder);
-        cb(null, fs.existsSync(path));
-    };
-    RemixdClient.prototype.set = function (args, cb) {
-        if (this.readOnly)
-            return cb('Cannot write file: read-only mode selected');
-        var isFolder = args.path.endsWith('/');
-        var path = utils.absolutePath(args.path, this.currentSharedFolder);
-        if (fs.existsSync(path) && !isRealPath(path, cb))
-            return;
-        if (args.content === 'undefined') { // no !!!!!
-            console.log('trying to write "undefined" ! stopping.');
-            return;
-        }
-        this.trackDownStreamUpdate[path] = path;
-        if (isFolder) {
-            fs.mkdirp(path).then(function () { return cb(); }).catch(function (e) { return cb(e); });
-        }
-        else {
-            fs.ensureFile(path).then(function () {
-                fs.writeFile(path, args.content, 'utf8', function (error, data) {
-                    if (error)
-                        console.log(error);
-                    cb(error, data);
-                });
-            }).catch(function (e) { return cb(e); });
-        }
-    };
-    RemixdClient.prototype.rename = function (args, cb) {
-        if (this.readOnly)
-            return cb('Cannot rename file: read-only mode selected');
-        var oldpath = utils.absolutePath(args.oldPath, this.currentSharedFolder);
-        if (!fs.existsSync(oldpath)) {
-            return cb('File not found ' + oldpath);
-        }
-        var newpath = utils.absolutePath(args.newPath, this.currentSharedFolder);
-        if (!isRealPath(oldpath, cb))
-            return;
-        fs.move(oldpath, newpath, function (error, data) {
-            if (error)
-                console.log(error);
-            cb(error, data);
-        });
-    };
-    RemixdClient.prototype.remove = function (args, cb) {
-        if (this.readOnly)
-            return cb('Cannot remove file: read-only mode selected');
-        var path = utils.absolutePath(args.path, this.currentSharedFolder);
-        if (!fs.existsSync(path)) {
-            return cb('File not found ' + path);
-        }
-        if (!isRealPath(path, cb))
-            return;
-        fs.remove(path, function (error) {
-            if (error) {
-                console.log(error);
-                return cb('Failed to remove file/directory: ' + error);
-            }
-            cb(error, true);
-        });
-    };
-    RemixdClient.prototype.isDirectory = function (args, cb) {
-        var path = utils.absolutePath(args.path, this.currentSharedFolder);
-        cb(null, fs.statSync(path).isDirectory());
-    };
-    RemixdClient.prototype.isFile = function (args, cb) {
-        var path = utils.absolutePath(args.path, this.currentSharedFolder);
-        cb(null, fs.statSync(path).isFile());
-    };
-    return RemixdClient;
-}(plugin_1.PluginClient));
-exports.default = RemixdClient;
-function isRealPath(path, cb) {
-    var realPath = fs.realpathSync(path);
-    var isRealPath = path === realPath;
-    var mes = '[WARN] Symbolic link modification not allowed : ' + path + ' | ' + realPath;
-    if (!isRealPath) {
-        console.log('\x1b[33m%s\x1b[0m', mes);
-    }
-    if (cb && !isRealPath)
-        cb(mes);
-    return isRealPath;
-}
diff --git a/lib/src/websocket.d.ts b/lib/src/websocket.d.ts
deleted file mode 100644
index ba7774563c..0000000000
--- a/lib/src/websocket.d.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-/// <reference types="node" />
-import * as WS from 'ws';
-import * as http from 'http';
-import RemixdClient from './services/remixdClient';
-export default class WebSocket {
-    port: number;
-    opt: {
-        [key: string]: string;
-    };
-    server: http.Server;
-    wsServer: WS.Server;
-    remixdClient: RemixdClient;
-    constructor(port: number, opt: {
-        [key: string]: string;
-    }, remixdClient: RemixdClient);
-    start(callback?: Function): void;
-    close(): void;
-}
diff --git a/lib/src/websocket.js b/lib/src/websocket.js
deleted file mode 100644
index 5a56511900..0000000000
--- a/lib/src/websocket.js
+++ /dev/null
@@ -1,36 +0,0 @@
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });
-var WS = require("ws");
-var http = require("http");
-var buildWebsocketClient = require('@remixproject/plugin-ws').buildWebsocketClient;
-var WebSocket = /** @class */ (function () {
-    function WebSocket(port, opt, remixdClient) {
-        this.port = port;
-        this.opt = opt;
-        this.remixdClient = remixdClient;
-    }
-    WebSocket.prototype.start = function (callback) {
-        var obj = this;
-        this.server = http.createServer(function (request, response) {
-            console.log((new Date()) + ' Received request for ' + request.url);
-            response.writeHead(404);
-            response.end();
-        });
-        var loopback = '127.0.0.1';
-        this.server.listen(this.port, loopback, function () {
-            console.log((new Date()) + ' Remixd is listening on ' + loopback + ':65520');
-        });
-        this.wsServer = new WS.Server({ server: this.server });
-        this.wsServer.on('connection', function connection(ws) {
-            var client = buildWebsocketClient(ws, obj.remixdClient);
-            if (callback)
-                callback(client);
-        });
-    };
-    WebSocket.prototype.close = function () {
-        console.log('this.server: ', this.server);
-        this.server.close();
-    };
-    return WebSocket;
-}());
-exports.default = WebSocket;
diff --git a/package.json b/package.json
index de235610ad..4045533899 100644
--- a/package.json
+++ b/package.json
@@ -8,10 +8,10 @@
   },
   "scripts": {
     "test": "echo \"Error: no test specified\"",
-    "start": "./lib/bin/remixd.js -s ./shared --remix-ide http://127.0.0.1:8080",
+    "start": "./lib/bin/remixd.js",
     "npip": "npip",
     "lint": "eslint ./src",
-    "build": "tsc -p ./; chmod +x ./lib/bin/remixd.js",
+    "build": "tsc -p ./ && chmod +x ./lib/bin/remixd.js",
     "dev": "nodemon"
   },
   "repository": {
diff --git a/src/services/remixdClient.ts b/src/services/remixdClient.ts
index 7f1dbf9a00..458a618ca0 100644
--- a/src/services/remixdClient.ts
+++ b/src/services/remixdClient.ts
@@ -1,14 +1,14 @@
 import WebSocket from '../websocket'
 import { PluginClient } from '@remixproject/plugin'
+import { SharedFolderArgs, TrackDownStreamUpdate } from '../../types'
 
 const utils = require('../utils')
 const isbinaryfile = require('isbinaryfile')
 const fs = require('fs-extra')
 
 export default class RemixdClient extends PluginClient {
-  trackDownStreamUpdate: {
-    [key: string]: string
-  }
+  methods: []
+  trackDownStreamUpdate: TrackDownStreamUpdate
   websocket: WebSocket | null
   currentSharedFolder: string
   readOnly: boolean
@@ -22,9 +22,7 @@ export default class RemixdClient extends PluginClient {
     this.readOnly = readOnly
   }
 
-  list (args: {
-    [key: string]: string
-  }, cb: Function) {
+  list (args: SharedFolderArgs, cb: Function) {
     try {
       cb(null, utils.walkSync(this.currentSharedFolder, {}, this.currentSharedFolder))
     } catch (e) {
@@ -32,27 +30,23 @@ export default class RemixdClient extends PluginClient {
     }
   }
 
-  resolveDirectory (args: {
-    [key: string]: string
-  }, cb: Function) {
+  resolveDirectory (args: SharedFolderArgs, cb: Function) {
     try {
       const path = utils.absolutePath(args.path, this.currentSharedFolder)
+      
       cb(null, utils.resolveDirectory(path, this.currentSharedFolder))
     } catch (e) {
       cb(e.message)
     }
   }
 
-  folderIsReadOnly (args: {
-    [key: string]: string
-  }, cb: Function) {
+  folderIsReadOnly (args: SharedFolderArgs, cb: Function) {
     return cb(null, this.readOnly)
   }
 
-  get (args: {
-    [key: string]: string
-  }, cb: Function) {
+  get (args: SharedFolderArgs, cb: Function) {
     const path = utils.absolutePath(args.path, this.currentSharedFolder)
+
     if (!fs.existsSync(path)) {
       return cb('File not found ' + path)
     }
@@ -70,20 +64,17 @@ export default class RemixdClient extends PluginClient {
     })
   }
 
-  exists (args: {
-    [key: string]: string
-  }, cb: Function) {
+  exists (args: SharedFolderArgs, cb: Function) {
     const path = utils.absolutePath(args.path, this.currentSharedFolder)
 
     cb(null, fs.existsSync(path))
   }
 
-  set (args: {
-    [key: string]: string
-  }, cb: Function) {
+  set (args: SharedFolderArgs, cb: Function) {
     if (this.readOnly) return cb('Cannot write file: read-only mode selected')
     const isFolder = args.path.endsWith('/')
     const path = utils.absolutePath(args.path, this.currentSharedFolder)
+
     if (fs.existsSync(path) && !isRealPath(path, cb)) return
     if (args.content === 'undefined') { // no !!!!!
       console.log('trying to write "undefined" ! stopping.')
@@ -102,15 +93,15 @@ export default class RemixdClient extends PluginClient {
     }
   }
 
-  rename (args: {
-    [key: string]: string
-  }, cb: Function) {
+  rename (args: SharedFolderArgs, cb: Function) {
     if (this.readOnly) return cb('Cannot rename file: read-only mode selected')
     const oldpath = utils.absolutePath(args.oldPath, this.currentSharedFolder)
+
     if (!fs.existsSync(oldpath)) {
       return cb('File not found ' + oldpath)
     }
     const newpath = utils.absolutePath(args.newPath, this.currentSharedFolder)
+
     if (!isRealPath(oldpath, cb)) return
     fs.move(oldpath, newpath, (error: Error, data: string) => {
       if (error) console.log(error)
@@ -118,11 +109,10 @@ export default class RemixdClient extends PluginClient {
     })
   }
 
-  remove (args: {
-    [key: string]: string
-  }, cb: Function) {
+  remove (args: SharedFolderArgs, cb: Function) {
     if (this.readOnly) return cb('Cannot remove file: read-only mode selected')
     const path = utils.absolutePath(args.path, this.currentSharedFolder)
+
     if (!fs.existsSync(path)) {
       return cb('File not found ' + path)
     }
@@ -136,17 +126,13 @@ export default class RemixdClient extends PluginClient {
     })
   }
 
-  isDirectory (args: {
-    [key: string]: string
-  }, cb: Function) {
+  isDirectory (args: SharedFolderArgs, cb: Function) {
     const path = utils.absolutePath(args.path, this.currentSharedFolder)
 
     cb(null, fs.statSync(path).isDirectory())
   }
 
-  isFile (args: {
-    [key: string]: string
-  }, cb: Function) {
+  isFile (args: SharedFolderArgs, cb: Function) {
     const path = utils.absolutePath(args.path, this.currentSharedFolder)
 
     cb(null, fs.statSync(path).isFile())
@@ -157,6 +143,7 @@ function isRealPath (path: string, cb: Function) {
   const realPath = fs.realpathSync(path)
   const isRealPath = path === realPath
   const mes = '[WARN] Symbolic link modification not allowed : ' + path + ' | ' + realPath
+
   if (!isRealPath) {
     console.log('\x1b[33m%s\x1b[0m', mes)
   }
diff --git a/src/utils.ts b/src/utils.ts
index 36d6891e06..b914c7ce36 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,3 +1,5 @@
+import { ResolveDirectory } from '../types'
+
 const fs = require('fs-extra')
 const path = require('path')
 const isbinaryfile = require('isbinaryfile')
@@ -32,12 +34,12 @@ function absolutePath (path: string, sharedFolder:string) {
  * @param {String} sharedFolder - absolute shared path. platform dependent representation
  * @return {String} relative path (Unix style which is the one used by Remix IDE)
  */
-function relativePath (path: string, sharedFolder: string) {
-  const relative = pathModule.relative(sharedFolder, path)
+function relativePath (path: string, sharedFolder: string): string {
+  const relative = <string>pathModule.relative(sharedFolder, path)
   return normalizePath(relative)
 }
 
-function normalizePath (path: string) {
+function normalizePath (path: string): string {
   if (process.platform === 'win32') {
     return path.replace(/\\/g, '/')
   }
@@ -48,6 +50,7 @@ function walkSync (dir: string, filelist: {
   [key: string]: string
 }, sharedFolder: string) {
   const files: string[] = fs.readdirSync(dir)
+
   filelist = filelist || {}
   files.forEach(function (file) {
     var subElement = path.join(dir, file)
@@ -63,11 +66,10 @@ function walkSync (dir: string, filelist: {
   return filelist
 }
 
-function resolveDirectory (dir: string, sharedFolder: string) {
-  const ret: {
-    [key: string]: any
-  } = {}
+function resolveDirectory (dir: string, sharedFolder: string): ResolveDirectory {
+  const ret: ResolveDirectory = {}
   const files: string[] = fs.readdirSync(dir)
+
   files.forEach(function (file) {
     const subElement = path.join(dir, file)
     if (!fs.lstatSync(subElement).isSymbolicLink()) {
diff --git a/src/websocket.ts b/src/websocket.ts
index 965395571a..58fea0ac74 100644
--- a/src/websocket.ts
+++ b/src/websocket.ts
@@ -1,29 +1,20 @@
 import * as WS from 'ws'
 import * as http from 'http'
 import RemixdClient from './services/remixdClient'
+import { WebsocketOpt } from '../types'
+
 const { buildWebsocketClient } = require('@remixproject/plugin-ws')
 
 export default class WebSocket {
-  port: number
-  opt: { 
-    [key: string]: string
-  }
   server: http.Server
   wsServer: WS.Server
-  remixdClient: RemixdClient
-
-  constructor (port: number, opt: {
-    [key: string]: string
-  }, remixdClient: RemixdClient) {
-    this.port = port
-    this.opt = opt
-    this.remixdClient = remixdClient
-  }
+
+  constructor (public port: number, public opt: WebsocketOpt, public remixdClient: RemixdClient) {}
 
   start (callback?: Function) {
     const obj = this
 
-    this.server = http.createServer(function (request, response) {
+    this.server = http.createServer((request, response) => {
       console.log((new Date()) + ' Received request for ' + request.url)
       response.writeHead(404)
       response.end()
@@ -33,8 +24,18 @@ export default class WebSocket {
     this.server.listen(this.port, loopback, function () {
       console.log((new Date()) + ' Remixd is listening on ' + loopback + ':65520')
     })
-    this.wsServer = new WS.Server({ server: this.server })
-    this.wsServer.on('connection', function connection(ws) {
+    this.wsServer = new WS.Server({
+      server: this.server,
+      verifyClient: (info, done) => {
+        if (!originIsAllowed(info.origin, this)) {
+          done(false)
+          console.log((new Date()) + ' Connection from origin ' + info.origin + ' rejected.')
+          return
+        }
+        done(true)
+      }
+    })
+    this.wsServer.on('connection', function connection(ws, request) {
       const client = buildWebsocketClient(ws, obj.remixdClient)
 
       if(callback) callback(client)
@@ -42,7 +43,14 @@ export default class WebSocket {
   }
 
   close () {
-    console.log('this.server: ', this.server)
-    this.server.close()
+    if (this.wsServer) {
+      this.wsServer.close(() => {
+        this.server.close()
+      })
+    }
   }
 }
+
+function originIsAllowed (origin: string, self: WebSocket) {
+  return origin === self.opt.remixIdeUrl
+}
diff --git a/types/index.ts b/types/index.ts
new file mode 100644
index 0000000000..18fbfca1cb
--- /dev/null
+++ b/types/index.ts
@@ -0,0 +1,20 @@
+export type WebsocketOpt = {
+    remixIdeUrl: string
+}
+
+export type SharedFolderArgs = {
+    path: string,
+    [key: string]: string | number | boolean
+}
+
+export type KeyPairString = {
+    [key: string]: string
+}
+
+export type ResolveDirectory = {
+    [key: string]: {
+        isDirectory: boolean
+    }
+}
+
+export type TrackDownStreamUpdate = KeyPairString
\ No newline at end of file