diff --git a/public/views/create.html b/public/views/create.html
index 83f02975d..489808cf3 100644
--- a/public/views/create.html
+++ b/public/views/create.html
@@ -8,7 +8,7 @@
 
 <div class="content p20v" ng-controller="createController as create" ng-init="create.setTotalCopayers(1)">
 
-  <div class="onGoingProcess" ng-show="create.loading">
+  <div class="onGoingProcess" ng-show="create.loading && !create.ledger">
     <div class="onGoingProcess-content" ng-style="{'background-color':'#222'}">
     <div class="spinner">
       <div class="rect1"></div>
@@ -21,6 +21,19 @@
     </div>
   </div>
 
+  <div class="onGoingProcess" ng-show="create.ledger">
+    <div class="onGoingProcess-content" ng-style="{'background-color':'#222'}">
+    <div class="spinner">
+      <div class="rect1"></div>
+      <div class="rect2"></div>
+      <div class="rect3"></div>
+      <div class="rect4"></div>
+      <div class="rect5"></div>
+    </div>
+    <span translate>Connecting to Ledger Wallet...</span>
+    </div>
+  </div>
+
   <div class="create-tab small-only-text-center" ng-hide="create.hideTabs">
     <div class="row">
     <div class="tab-container small-6 medium-3 large-2">
@@ -87,12 +100,22 @@
             <i ng-if="!hideAdv" class="icon-arrow-up4"></i>
           </a>
         </div>
-        <div ng-hide="hideAdv" class="row">
+        <div ng-hide="hideAdv" class="row" ng-init="hideSlots=true">
           <div class="large-12 columns">
             <label for="network-name" class="line-b oh">
               <span translate>Testnet</span>
               <switch id="network-name" name="isTestnet" ng-model="isTestnet" class="green right m5t m10b"></switch>
             </label>
+            <label ng-show="create.isChromeApp()" for="hw-ledger" class="line-b oh">
+              <span translate>Use Ledger hardware wallet</span>
+              <switch id="hw-ledger" name="hwLedger" ng-model="hwLedger" class="green right m5t m10b" ng-change="hideSlots=false"></switch>
+            </label>
+            <div ng-hide="hideSlots">
+              <label class="line-b oh"><span translate>Select slot number for Ledger key</span>
+                <select class="m10t" ng-model="externalIndex" ng-options="externalIndex as externalIndex for externalIndex in create.externatIndexValues">
+                </select>
+              </label>
+            </div>         
             <label for="ext-master" class="m10t">
               <span translate>Master extended private key</span>
               <small translate>If not given, a secure key will be generated</small>
diff --git a/public/views/join.html b/public/views/join.html
index 7c4a19f8a..437a07fdc 100644
--- a/public/views/join.html
+++ b/public/views/join.html
@@ -6,7 +6,7 @@
 
 
 <div class="content p20v" ng-controller="joinController as join">
-  <div class="onGoingProcess" ng-show="join.loading">
+  <div class="onGoingProcess" ng-show="join.loading && !join.ledger">
     <div class="onGoingProcess-content" ng-style="{'background-color':'#222'}">
     <div class="spinner">
       <div class="rect1"></div>
@@ -19,6 +19,19 @@
     </div>
   </div>
 
+  <div class="onGoingProcess" ng-show="join.ledger">
+    <div class="onGoingProcess-content" ng-style="{'background-color':'#222'}">
+    <div class="spinner">
+      <div class="rect1"></div>
+      <div class="rect2"></div>
+      <div class="rect3"></div>
+      <div class="rect4"></div>
+      <div class="rect5"></div>
+    </div>
+    <span translate>Connecting to Ledger Wallet...</span>
+    </div>
+  </div>
+
   <div class="row">
     <div class="large-12 columns">
 
@@ -71,7 +84,20 @@
             <i ng-show="!join.hideAdv" class="icon-arrow-down4"></i>
             <i ng-show="join.hideAdv" class="icon-arrow-up4"></i>
           </a>
-          <div ng-show="join.hideAdv" class="row">
+          <div ng-show="join.hideAdv" class="row" ng-init="hideSlots=true">
+            <div class="large-12 columns" ng-show="join.isChromeApp()">
+              <label for="hw-ledger" class="line-b oh">
+                <span translate>Use Ledger hardware wallet</span>
+                <switch id="hw-ledger" name="hwLedger" ng-model="hwLedger" class="green right m5t m10b" ng-change="hideSlots=false"></switch>
+              </label>
+            </div>
+            <div class="large-12 columns" ng-hide="hideSlots">
+              <label class="line-b oh">
+                <span translate>Select slot number for Ledger key</span>
+                <select class="m10t" ng-model="externalIndex" ng-options="externalIndex as externalIndex for externalIndex in join.externatIndexValues">
+                </select>
+              </label>
+            </div>         
             <div class="large-12 columns">
               <label for="ext-master">{{'Master extended private key'|translate}}
               <small translate>If not given, a secure key will be generated</small>
diff --git a/public/views/preferences.html b/public/views/preferences.html
index 6f46dba1f..fdc3f250f 100644
--- a/public/views/preferences.html
+++ b/public/views/preferences.html
@@ -36,10 +36,17 @@
         <span ng-style="{'color':index.backgroundColor}">&block;</span>
       </span>      
     </li>
-    <li class="line-b p20">
+    <li class="line-b p20" ng-hide="preferences.externalIndex >= 0">
       <span translate>Encrypt Private Key</span>
       <switch id="network-name" name="encrypt" ng-model="encrypt" class="green right"></switch>
-  </li>
+    </li>
+    <li class="line-b p20" ng-show="preferences.externalIndex >= 0">
+      <span translate>Hardware wallet</span>
+      <span class="right text-gray">
+        {{preferences.externalSource}} 
+        (index {{preferences.externalIndex}})
+      </span>
+    </li>
  
     <h4 class="title m0">&nbsp;</h4>
     <li class="line-b p20" ng-click="$root.go('backup')">
diff --git a/src/js/controllers/create.js b/src/js/controllers/create.js
index 8ac67f68a..7bcf141b5 100644
--- a/src/js/controllers/create.js
+++ b/src/js/controllers/create.js
@@ -1,12 +1,12 @@
 'use strict';
 
 angular.module('copayApp.controllers').controller('createController',
-  function($scope, $rootScope, $location, $timeout, $log, lodash, go, profileService, configService, isMobile, isCordova, gettext) {
+  function($scope, $rootScope, $location, $timeout, $log, lodash, go, profileService, configService, isMobile, isCordova, gettext, isChromeApp, ledger) {
 
     var self = this;
     var defaults = configService.getDefaults();
     this.isWindowsPhoneApp = isMobile.Windows() && isCordova;
-
+   
     /* For compressed keys, m*73 + n*34 <= 496 */
     var COPAYER_PAIR_LIMITS = {
       1: 1,
@@ -35,6 +35,8 @@ angular.module('copayApp.controllers').controller('createController',
       $scope.requiredCopayers = Math.min(parseInt(n / 2 + 1), maxReq);
     };
 
+    this.externatIndexValues = lodash.range(0,20);
+    $scope.externalIndex = 0;
     this.TCValues = lodash.range(2, defaults.limits.totalCopayers + 1);
     $scope.totalCopayers = defaults.wallet.totalCopayers;
 
@@ -42,6 +44,10 @@ angular.module('copayApp.controllers').controller('createController',
       updateRCSelect(tc);
     };
 
+    this.isChromeApp = function() {
+      return isChromeApp;
+    };
+
     this.create = function(form) {
       if (form && form.$invalid) {
         this.error = gettext('Please enter the required fields');
@@ -53,14 +59,40 @@ angular.module('copayApp.controllers').controller('createController',
         name: form.walletName.$modelValue,
         extendedPrivateKey: form.privateKey.$modelValue,
         myName: $scope.totalCopayers > 1 ? form.myName.$modelValue : null,
-        networkName: form.isTestnet.$modelValue ? 'testnet' : 'livenet'
+        networkName: form.isTestnet.$modelValue ? 'testnet' : 'livenet',
       };
       self.loading = true;
 
+      if (form.hwLedger.$modelValue) {
+        self.ledger = true;
+        ledger.getXPubKey($scope.externalIndex, function(data) {
+          self.ledger = false;
+          $scope.$apply();
+          if (data.success) {
+            opts.extendedPublicKey = data.xpubkey;
+            opts.externalSource = 'ledger';
+            opts.externalIndex = $scope.externalIndex;
+            self._create(opts);
+          } else {
+            self.loading = false;
+            $log.debug(data.message);
+            self.error = data.message;
+            $scope.$apply();
+          }
+        });
+      } else {
+        self._create(opts);
+      }
+    };
+
+    this._create = function (opts) {
       $timeout(function() {
         profileService.createWallet(opts, function(err, secret) {
           self.loading = false;
           if (err) {
+            if (err == "Error creating wallet" && opts.extendedPublicKey) {
+              err = "This xpub index is already used by another wallet. Please select another index."
+            }
             $log.debug(err);
             self.error = err;
             $timeout(function() {
@@ -72,7 +104,7 @@ angular.module('copayApp.controllers').controller('createController',
           }
         });
       }, 100);
-    };
+    }
     
     this.formFocus = function(what) {
       if (!this.isWindowsPhoneApp) return
@@ -82,7 +114,7 @@ angular.module('copayApp.controllers').controller('createController',
         this.hideTabs = true;
       }
       else if (what && what == 'wallet-name'){
-        this.hideTabs = true;
+        this.hideTabs = true;
       }
       else {
         this.hideWalletName = false;
diff --git a/src/js/controllers/join.js b/src/js/controllers/join.js
index 1ca442f8c..a5e732030 100644
--- a/src/js/controllers/join.js
+++ b/src/js/controllers/join.js
@@ -1,9 +1,15 @@
 'use strict';
 
 angular.module('copayApp.controllers').controller('joinController',
-  function($scope, $rootScope, $timeout, go, isMobile, notification, profileService, isCordova, $modal, gettext) {
+  function($scope, $rootScope, $timeout, go, isMobile, notification, profileService, isCordova, isChromeApp, $modal, gettext, lodash, ledger) {
 
     var self = this;
+    this.externatIndexValues = lodash.range(0,20);
+    $scope.externalIndex = 0;
+
+    this.isChromeApp = function() {
+      return isChromeApp;
+    };
 
     //TODO : make one function - this was copied from topbar.js
     var cordovaOpenScanner = function() {
@@ -145,12 +151,37 @@ angular.module('copayApp.controllers').controller('joinController',
       }
       self.loading = true;
 
+      var opts = {
+        secret: form.secret.$modelValue,
+        extendedPrivateKey: form.privateKey.$modelValue,
+        myName: form.myName.$modelValue
+      }
+
+      if (form.hwLedger.$modelValue) {
+        self.ledger = true;
+        ledger.getXPubKey($scope.externalIndex, function(data) {
+          self.ledger = false;
+          $scope.$apply();
+          if (data.success) {
+            opts.extendedPublicKey = data.xpubkey;
+            opts.externalSource = 'ledger';
+            opts.externalIndex = $scope.externalIndex;
+            self._join(opts);
+          } else {
+            self.loading = false;
+            $log.debug(data.message);
+            self.error = data.message;
+            $scope.$apply();
+          }
+        });
+      } else {
+        self._join(opts);
+      }
+    };
+
+    this._join = function(opts) {
       $timeout(function() {
-        profileService.joinWallet({
-          secret: form.secret.$modelValue,
-          extendedPrivateKey: form.privateKey.$modelValue,
-          myName: form.myName.$modelValue
-        }, function(err) {
+        profileService.joinWallet(opts, function(err) {
           if (err) {
             self.loading = false;
             self.error = err;
@@ -162,5 +193,5 @@ angular.module('copayApp.controllers').controller('joinController',
           }, 2000);
         });
       }, 100);
-    }
+    };
   });
diff --git a/src/js/controllers/preferences.js b/src/js/controllers/preferences.js
index c26db89e3..34130559d 100644
--- a/src/js/controllers/preferences.js
+++ b/src/js/controllers/preferences.js
@@ -13,8 +13,11 @@ angular.module('copayApp.controllers').controller('preferencesController',
     $scope.glideraEnabled = config.glidera.enabled;
     $scope.glideraTestnet = config.glidera.testnet;
     var fc = profileService.focusedClient;
-    if (fc)
+    if (fc) {
       $scope.encrypt = fc.hasPrivKeyEncrypted();
+      this.externalSource = fc.getPrivKeyExternalSourceName() == 'ledger' ? "Ledger" : null;
+      this.externalIndex = fc.getExternalIndex();
+    }
 
     var unwatchSpendUnconfirmed = $scope.$watch('spendUnconfirmed', function(newVal, oldVal) {
       if (newVal == oldVal) return;
diff --git a/src/js/controllers/walletHome.js b/src/js/controllers/walletHome.js
index 3707b758a..4bc7599b6 100644
--- a/src/js/controllers/walletHome.js
+++ b/src/js/controllers/walletHome.js
@@ -1,6 +1,6 @@
 'use strict';
 
-angular.module('copayApp.controllers').controller('walletHomeController', function($scope, $rootScope, $timeout, $filter, $modal, $log, notification, txStatus, isCordova, profileService, lodash, configService, rateService, storageService, bitcore, isChromeApp, gettext, gettextCatalog, nodeWebkit, addressService, feeService, bwsError, txFormatService) {
+angular.module('copayApp.controllers').controller('walletHomeController', function($scope, $rootScope, $timeout, $filter, $modal, $log, notification, txStatus, isCordova, profileService, lodash, configService, rateService, storageService, bitcore, isChromeApp, gettext, gettextCatalog, nodeWebkit, addressService, ledger, feeService, bwsError, utilService) {
 
   var self = this;
   $rootScope.hideMenuBar = false;
@@ -258,6 +258,33 @@ angular.module('copayApp.controllers').controller('walletHomeController', functi
           return;
         };
 
+        if (fc.isPrivKeyExternal()) {
+          if (fc.getPrivKeyExternalSourceName() == 'ledger') {
+            $log.debug('Requesting Ledger Chrome app to sign the transaction');
+            self.setOngoingProcess(gettext('Requesting Ledger Wallet to sign'));
+            $scope.loading = true;
+            $scope.error = null;
+            ledger.signTx(txp, fc.getExternalIndex(), function(result) {
+              if (result.success) {
+                txp.signatures = [];
+                for (var i=0; i<result.signatures.length; i++) {
+                  txp.signatures.push(result.signatures[i].substring(0, result.signatures[i].length - 2));
+                }
+                $scope._doSign(txp);
+              } else {
+                $scope.loading = false;
+                $scope.error = result.message;
+                self.setOngoingProcess();
+                $scope.$digest();
+              }
+            });
+          }
+        } else {
+          $scope._doSign(txp);
+        }
+      };
+
+      $scope._doSign = function(txp) {
         self.setOngoingProcess(gettext('Signing payment'));
         $scope.loading = true;
         $scope.error = null;
@@ -804,6 +831,30 @@ angular.module('copayApp.controllers').controller('walletHomeController', functi
 
   this.signAndBroadcast = function(txp, cb) {
     var fc = profileService.focusedClient;
+
+    if (fc.isPrivKeyExternal()) {
+      if (fc.getPrivKeyExternalSourceName() == 'ledger') {
+        $log.debug('Requesting Ledger Chrome app to sign the transaction');
+        self.setOngoingProcess(gettext('Requesting Ledger Wallet to sign'));
+        ledger.signTx(txp, fc.getExternalIndex(), function(result) {
+          if (result.success) {
+            txp.signatures = [];
+            for (var i=0; i<result.signatures.length; i++) {
+              txp.signatures.push(result.signatures[i].substring(0, result.signatures[i].length - 2));
+            }
+            self._doSignAndBroadcast(txp, cb);
+          } else {
+            return cb(result);
+          }
+        });
+      }
+    } else {
+      self._doSignAndBroadcast(txp, cb);
+    }
+  };
+
+  this._doSignAndBroadcast = function(txp, cb) {
+    var fc = profileService.focusedClient;
     self.setOngoingProcess(gettext('Signing transaction'));
     fc.signTxProposal(txp, function(err, signedTx) {
       profileService.lockFC();
diff --git a/src/js/services/ledger.js b/src/js/services/ledger.js
new file mode 100644
index 000000000..00c31542b
--- /dev/null
+++ b/src/js/services/ledger.js
@@ -0,0 +1,486 @@
+'use strict';
+
+angular.module('copayApp.services')
+  .factory('ledger', function(bwcService) {
+    var root = {};
+    var LEDGER_CHROME_ID = "kkdpmhnladdopljabkgpacgpliggeeaf";
+
+    root.callbacks = {};
+
+    root.hasSession = function() {
+      root._message({ command:"has_session" });
+    }
+
+    root.getXPubKey = function(index, callback) {
+      root.callbacks["get_xpubkey"] = callback;
+      root._messageAfterSession({ command:"get_xpubkey", path:root._getPath(index) })
+    };
+
+    root.signTx = function(txp, index, callback) {
+      root.callbacks["sign_p2sh"] = callback;
+      var redeemScripts = [];
+      var paths = [];
+      var tx = bwcService.getUtils().buildTx(txp);
+      for (var i=0; i<tx.inputs.length; i++) {
+        redeemScripts.push(new ByteString(tx.inputs[i].redeemScript.toBuffer().toString('hex'), GP.HEX).toString());
+        paths.push(root._getPath(index) + txp.inputs[i].path.substring(1));
+      }
+      var splitTransaction = root._splitTransaction(new ByteString(tx.toString(), GP.HEX));
+      var inputs = [];
+      for (var i=0; i<splitTransaction.inputs.length; i++) {
+        var input = splitTransaction.inputs[i];
+        inputs.push([
+          root._reverseBytestring(input.prevout.bytes(0, 32)).toString(),
+          root._reverseBytestring(input.prevout.bytes(32)).toString()
+        ]);
+      }
+      root._messageAfterSession({ 
+        command:"sign_p2sh", 
+        inputs: inputs, 
+        scripts: redeemScripts,
+        outputs_number: splitTransaction.outputs.length, 
+        outputs_script: splitTransaction.outputScript.toString(), 
+        paths: paths });                   
+    }
+
+    root._message = function(data) {
+      chrome.runtime.sendMessage(
+        LEDGER_CHROME_ID, 
+        { request: data }, 
+        function(response) { 
+          root._callback(response);
+        }
+      );
+    }
+
+    root._messageAfterSession = function(data) {
+      root._after_session = data;
+      root._message({ command:"launch" });
+      root._should_poll_session = true;
+      root._do_poll_session();
+    }
+
+    root._do_poll_session = function() {
+      root.hasSession();
+      if (root._should_poll_session) {
+        setTimeout(root._do_poll_session, 500);
+      }
+    }
+
+    root._callback = function(data) {
+      if (typeof data == "object") {
+        if (data.command == "has_session" && data.success) {
+          root._message(root._after_session);
+          root._after_session = null;
+          root._should_poll_session = false;
+        } else if (typeof root.callbacks[data.command] == "function") {
+          root.callbacks[data.command](data);
+        }
+      } else {
+        root._should_poll_session = false;
+        Object.keys(root.callbacks).forEach(function (key) { 
+          root.callbacks[key]({ success: false, message: "The Ledger Chrome application is not installed" });
+        });       
+      }
+    }
+
+    root._getPath = function(index) {
+      return bwcService.getUtils().PATHS.BASE_ADDRESS_DERIVATION + "/" + index;
+    }
+
+    root._splitTransaction = function(transaction) {
+      var result = {};
+      var inputs = [];
+      var outputs = [];
+      var offset = 0;
+      var version = transaction.bytes(offset, 4);
+      offset += 4;
+      var varint = root._getVarint(transaction, offset);
+      var numberInputs = varint[0];
+      offset += varint[1];
+      for (var i=0; i<numberInputs; i++) {
+        var input = {};
+        input['prevout'] = transaction.bytes(offset, 36);
+        offset += 36;
+        varint = root._getVarint(transaction, offset);
+        offset += varint[1];
+        input['script'] = transaction.bytes(offset, varint[0]);
+        offset += varint[0];
+        input['sequence'] = transaction.bytes(offset, 4);
+        offset += 4;
+        inputs.push(input);
+      }   
+      varint = root._getVarint(transaction, offset);
+      var numberOutputs = varint[0];
+      offset += varint[1];
+      var outputStartOffset = offset;
+      for (var i=0; i<numberOutputs; i++) {
+        var output = {};
+        output['amount'] = transaction.bytes(offset, 8);
+        offset += 8;
+        varint = root._getVarint(transaction, offset);
+        offset += varint[1];
+        output['script'] = transaction.bytes(offset, varint[0]);
+        offset += varint[0];
+        outputs.push(output);
+      }
+      var locktime = transaction.bytes(offset, 4);
+      result['version'] = version;
+      result['inputs'] = inputs;
+      result['outputs'] = outputs;
+      result['locktime'] = locktime;
+      result['outputScript'] = transaction.bytes(outputStartOffset, offset - outputStartOffset);
+      return result;
+    }
+
+    root._getVarint = function(data, offset) {
+      if (data.byteAt(offset) < 0xfd) {
+        return [ data.byteAt(offset), 1 ];
+      }
+      if (data.byteAt(offset) == 0xfd) {
+        return [ ((data.byteAt(offset + 2) << 8) + data.byteAt(offset + 1)), 3 ];
+      }
+      if (data.byteAt(offset) == 0xfe) {
+        return [ ((data.byteAt(offset + 4) << 24) + (data.byteAt(offset + 3) << 16) + 
+            (data.byteAt(offset + 2) << 8) + data.byteAt(offset + 1)), 5 ];
+      }
+    }
+
+    root._reverseBytestring = function(x) {
+      var res = "";
+      for (var i=x.length - 1; i>=0; i--) {
+        res += Convert.toHexByte(x.byteAt(i));
+      }
+      return new ByteString(res, GP.HEX);
+    }
+
+    return root;
+  });
+
+var Convert = {}; 
+
+/**
+ * Convert a binary string to his hexadecimal representation
+ * @param {String} src binary string
+ * @static
+ * @returns {String} hexadecimal representation
+ */
+Convert.stringToHex = function(src) {
+  var r = "";
+  var hexes = new Array ("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");
+  for (var i=0; i<src.length; i++) {r += hexes [src.charCodeAt(i) >> 4] + hexes [src.charCodeAt(i) & 0xf];}
+  return r; 
+}
+
+/**
+ * Convert an hexadecimal string to its binary representation
+ * @param {String} src hexadecimal string
+ * @static
+ * @return {Array} byte array
+ * @throws {InvalidString} if the string isn't properly formatted
+ */
+Convert.hexToBin = function(src) {
+   var result = "";
+   var digits = "0123456789ABCDEF";
+   if ((src.length % 2) != 0) {
+  throw "Invalid string";
+   }
+   src = src.toUpperCase();
+   for (var i=0; i<src.length; i+=2) {
+  var x1 = digits.indexOf(src.charAt(i));
+        if (x1 < 0) {
+    return "";
+  }
+  var x2 = digits.indexOf(src.charAt(i + 1));
+  if (x2 < 0) {
+    return "";
+  }
+  result += String.fromCharCode((x1 << 4) + x2);
+   }
+   return result;
+}
+
+/**
+ * Convert a double digit hexadecimal number to an integer
+ * @static
+ * @param {String} data buffer containing the digit to parse
+ * @param {Number} offset offset to the digit (default is 0)
+ * @returns {Number} converted digit
+ */
+Convert.readHexDigit = function(data, offset) {
+  var digits = '0123456789ABCDEF';
+  if (typeof offset == "undefined") {
+    offset = 0;
+  }
+  return (digits.indexOf(data.substring(offset, offset + 1).toUpperCase()) << 4) + (digits.indexOf(data.substring(offset + 1, offset + 2).toUpperCase()));  
+}
+
+/**
+ * Convert a number to a two digits hexadecimal string (deprecated)
+ * @static
+ * @param {Number} number number to convert
+ * @returns {String} converted number
+ */
+Convert.toHexDigit = function(number) {
+  var digits = '0123456789abcdef';
+  return digits.charAt(number >> 4) + digits.charAt(number & 0x0F);
+}
+
+/**
+ * Convert a number to a two digits hexadecimal string (similar to toHexDigit)
+ * @static
+ * @param {Number} number number to convert
+ * @returns {String} converted number
+ */
+Convert.toHexByte = function(number) {
+  return Convert.toHexDigit(number);
+}
+
+/**
+ * Convert a BCD number to a two digits hexadecimal string
+ * @static
+ * @param {Number} number number to convert
+ * @returns {String} converted number
+ */
+Convert.toHexByteBCD = function(numberBCD) {
+  var number = ((numberBCD / 10) * 16) + (numberBCD % 10);
+  return Convert.toHexDigit(number);
+}
+
+
+/**
+ * Convert a number to an hexadecimal short number
+ * @static
+ * @param {Number} number number to convert
+ * @returns {String} converted number
+ */
+Convert.toHexShort = function(number) {
+  return Convert.toHexDigit((number >> 8) & 0xff) + Convert.toHexDigit(number & 0xff);
+}
+
+/**
+ * Convert a number to an hexadecimal int number
+ * @static
+ * @param {Number} number number to convert
+ * @returns {String} converted number
+ */
+Convert.toHexInt = function(number) {
+  return Convert.toHexDigit((number >> 24) & 0xff) + Convert.toHexDigit((number >> 16) & 0xff) +
+       Convert.toHexDigit((number >> 8) & 0xff) + Convert.toHexDigit(number & 0xff);
+}
+
+
+var GP = {};
+GP.ASCII = 1;
+GP.HEX = 5;
+
+/**
+  * @class GPScript ByteString implementation
+  * @param {String} value initial value
+  * @param {HEX|ASCII} encoding encoding to use
+  * @property {Number} length length of the ByteString
+  * @constructs
+*/
+var ByteString = function(value, encoding) {
+    this.encoding = encoding;
+    this.hasBuffer = (typeof Buffer != 'undefined');
+    if (this.hasBuffer && (value instanceof Buffer)) {
+      this.value = value;
+      this.encoding = GP.HEX;     
+    }
+    else {
+      switch(encoding) {
+        case GP.HEX:
+          if (!this.hasBuffer) {
+            this.value = Convert.hexToBin(value);
+          }
+          else {
+            this.value = new Buffer(value, 'hex'); 
+          }
+          break;
+      
+        case GP.ASCII:
+          if (!this.hasBuffer) {
+            this.value = value;
+          }
+          else {
+            this.value = new Buffer(value, 'ascii'); 
+          }
+          break;
+        
+        default:
+          throw "Invalid arguments"; 
+      }
+    }
+    this.length = this.value.length;
+}
+
+/**
+ * Retrieve the byte value at the given index
+ * @param {Number} index index
+ * @returns {Number} byte value
+*/
+ByteString.prototype.byteAt = function(index) {
+    if (arguments.length < 1) {
+      throw "Argument missing";
+    }   
+    if (typeof index != "number") {
+      throw "Invalid index";
+    }   
+    if ((index < 0) || (index >= this.value.length)) {
+      throw "Invalid index offset";
+    }
+    if (!this.hasBuffer) {
+      return Convert.readHexDigit(Convert.stringToHex(this.value.substring(index, index + 1)));
+    }
+    else {
+      return this.value[index];
+    }
+}
+  
+/**
+ * Retrieve a subset of the ByteString
+ * @param {Number} offset offset to start at
+ * @param {Number} [count] size of the target ByteString (default : use the remaining length)
+ * @returns {ByteString} subset of the original ByteString 
+*/
+ByteString.prototype.bytes = function(offset, count) {
+    var result;
+    if (arguments.length < 1) {
+      throw "Argument missing";
+    }
+    if (typeof offset != "number") {
+      throw "Invalid offset";
+    }
+    //if ((offset < 0) || (offset >= this.value.length)) {
+    if (offset < 0) {
+      throw "Invalid offset";
+    }
+    if (typeof count == "number") {
+      if (count < 0) {
+        throw "Invalid count";
+      }
+      if (!this.hasBuffer) {
+        result = new ByteString(this.value.substring(offset, offset + count), GP.ASCII);
+      }
+      else {
+        result = new Buffer(count);
+        this.value.copy(result, 0, offset, offset + count);
+      }
+    }
+    else 
+    if (typeof count == "undefined") {
+      if (!this.hasBuffer) {
+        result = new ByteString(this.value.substring(offset), GP.ASCII);
+      }
+      else {
+        result = new Buffer(this.value.length - offset);
+        this.value.copy(result, 0, offset, this.value.length);
+      }
+    }
+    else {
+      throw "Invalid count";
+    }
+    if (!this.hasBuffer) {
+      result.encoding = this.encoding;
+      return result;      
+    }
+    else {
+      return new ByteString(result, GP.HEX);
+    }
+}
+
+/**
+ * Appends two ByteString
+ * @param {ByteString} target ByteString to append
+ * @returns {ByteString} result of the concatenation
+*/
+ByteString.prototype.concat = function(target) {
+    if (arguments.length < 1) {
+      throw "Not enough arguments";
+    }   
+    if (!(target instanceof ByteString)) {
+      throw "Invalid argument";
+    }
+    if (!this.hasBuffer) {
+      var result = this.value + target.value;
+      var x = new ByteString(result, GP.ASCII);
+      x.encoding = this.encoding;
+      return x;         
+    }
+    else {
+      var result = Buffer.concat([this.value, target.value]);
+      return new ByteString(result, GP.HEX);
+    }
+}
+  
+/**
+ * Check if two ByteString are equal
+ * @param {ByteString} target ByteString to check against
+ * @returns {Boolean} true if the two ByteString are equal
+*/
+ByteString.prototype.equals = function(target) {
+    if (arguments.length < 1) {
+      throw "Not enough arguments";
+    }   
+    if (!(target instanceof ByteString)) {
+      throw "Invalid argument";
+    }
+    if (!this.hasBuffer) {
+      return (this.value == target.value);
+    }
+    else {
+      return Buffer.equals(this.value, target.value);
+    }
+}
+  
+  
+/**
+ * Convert the ByteString to a String using the given encoding
+ * @param {HEX|ASCII|UTF8|BASE64|CN} encoding encoding to use
+ * @return {String} converted content
+*/
+ByteString.prototype.toString = function(encoding) {
+    var targetEncoding = this.encoding;
+    if (arguments.length >= 1) {
+      if (typeof encoding != "number") {
+        throw "Invalid encoding";
+      }
+      switch(encoding) {
+        case GP.HEX:
+        case GP.ASCII:
+          targetEncoding = encoding;
+          break;
+        
+        default:
+          throw "Unsupported arguments";
+      }
+      targetEncoding = encoding;
+    }
+    switch(targetEncoding) {
+      case GP.HEX:
+        if (!this.hasBuffer) {
+          return Convert.stringToHex(this.value);
+        }
+        else {
+          return this.value.toString('hex');
+        }
+      case GP.ASCII:
+        if (!this.hasBuffer) {
+          return this.value;
+        }
+        else {
+          return this.value.toString();
+        }
+      default:
+        throw "Unsupported";
+    }   
+  }
+  
+ByteString.prototype.toStringIE =  function(encoding) {
+  return this.toString(encoding);
+}
+
+ByteString.prototype.toBuffer = function() {
+  return this.value;
+}
diff --git a/src/js/services/profileService.js b/src/js/services/profileService.js
index 0afbef3b8..c0bfe7ec7 100644
--- a/src/js/services/profileService.js
+++ b/src/js/services/profileService.js
@@ -1,6 +1,6 @@
 'use strict';
 angular.module('copayApp.services')
-  .factory('profileService', function profileServiceFactory($rootScope, $location, $timeout, $filter, $log, lodash, storageService, bwcService, configService, notificationService, isChromeApp, isCordova, gettext, nodeWebkit, bwsError) {
+  .factory('profileService', function profileServiceFactory($rootScope, $location, $timeout, $filter, $log, lodash, storageService, bwcService, configService, notificationService, isChromeApp, isCordova, gettext, nodeWebkit, bwsError, ledger) {
 
     var root = {};
 
@@ -193,6 +193,12 @@ angular.module('copayApp.services')
         } catch (ex) {
           return cb(gettext('Could not create using the specified extended private key'));
         }
+      } else if (opts.extendedPublicKey) {
+        try {
+          walletClient.seedFromExternalWalletPublicKey(opts.extendedPublicKey, opts.externalSource, opts.externalIndex);
+        } catch (ex) {
+          return cb(gettext('Could not create using the specified extended public key'));
+        }
       }
       walletClient.createWallet(opts.name, opts.myName || 'me', opts.m, opts.n, {
         network: opts.networkName
@@ -219,8 +225,13 @@ angular.module('copayApp.services')
         } catch (ex) {
           return cb(gettext('Could not join using the specified extended private key'));
         }
-      }
-
+      } else if (opts.extendedPublicKey) {
+        try {
+          walletClient.seedFromExternalWalletPublicKey(opts.extendedPublicKey, opts.externalSource, opts.externalIndex);
+        } catch (ex) {
+          return cb(gettext('Could not create using the specified extended public key'));
+        }
+      }      
 
       try {
         var walletData = this.getUtils().fromSecret(opts.secret);