diff --git a/flutter-app/lib/bloc/auth_bloc.dart b/flutter-app/lib/bloc/auth_bloc.dart
index ad69fb8..df1188e 100644
--- a/flutter-app/lib/bloc/auth_bloc.dart
+++ b/flutter-app/lib/bloc/auth_bloc.dart
@@ -1,39 +1,54 @@
 import 'dart:async';
 import 'package:flatten/bloc/bloc_provider.dart';
-import 'package:flutter/foundation.dart';
-/// this is the user modal, and we can use this to access current user data
-/// once they are logged in
-class User implements BlocBase{
-  User({@required this.uid, @required this.preName, @required this.name, @required this.zip});
-  final String uid;
-  final String preName;
-  final String name;
-  final String zip;
+import 'package:flatten/bloc/user_bloc.dart';
+import 'package:flatten/models/api_response.dart';
+import 'package:flatten/services/qr_code_service.dart';
+import 'package:flatten/models/qr_code_add.dart';
+import 'package:flatten/models/qr_code.dart';
 
-  void dispose(){
-    
-  }
-  
-  Map<String, String> get userData => {'uid' : uid, 'preName': preName, 'name': name, 'zip': zip};
-}
-
-
-///this class can be modified to do authenticaion, once we have a database ready, we just have to 
+///this class can be modified to do authenticaion, once we have a database ready, we just have to
 ///add the sign-in logic in the singIn() method and enter the user details, we can also add a method here to
 ///check whether the user already exists in our database or not
-class Auth implements BlocBase {
-  StreamController _controller = StreamController<User>();
-  Stream get userStream => _controller.stream;
+class Auth_Bloc implements BlocBase {
+
+  StreamController _usercontroller = StreamController<User_Bloc>();
+  StreamController _isAuthenticating = StreamController<AuthState>();
+
+  Stream get userStream => _usercontroller.stream;
+  Stream get isAuthenticationStream => _isAuthenticating.stream;
 
-  void _setUser(User user) => _controller.add(user);
+  void _setUser(User_Bloc user) => _usercontroller.add(user);
+  void _setIsAuthenicating(AuthState authState) => _isAuthenticating.add(authState);
 
-  void dispose(){
-    _controller.close();
-  } 
- 
- void signIn(String uid, String preName, String name, String zip){
-   User user = User(name: name, uid: uid, preName: preName, zip: zip);
-   _setUser(user);
- }
-  
-}
\ No newline at end of file
+  void dispose() {
+    _usercontroller.close();
+    _isAuthenticating.close();
+  }
+
+  void signIn(String preName, String name, String zip) async{
+    final qr_code_for_add = QR_Code_For_Add(
+        name: name,
+        useCase: 1,
+        active: true,
+        additionalInformation: "",
+        gpsPosition: zip,
+        status: 1);
+    QR_Code_Service service = QR_Code_Service();
+    _setIsAuthenicating(AuthState(inProgress: true, errorOccured: false));
+   final APIResponse<QrCode> qrCodeData = await service.upLoadQR(qr_code_for_add);
+   final QrCode qrCode = qrCodeData.data;
+   if(!qrCodeData.error){
+    User_Bloc user = User_Bloc(name: qrCode.name, uid: qrCode.id, preName: preName, zip: zip);
+    _setIsAuthenicating(AuthState(inProgress : false, errorOccured: false));
+    _setUser(user);
+   }else{
+     _setIsAuthenicating(AuthState(inProgress:false, errorOccured: true));
+   }
+  }
+}
+
+class AuthState{
+  AuthState({this.inProgress, this.errorOccured});
+  bool inProgress;
+  bool errorOccured;
+}
diff --git a/flutter-app/lib/bloc/user_bloc.dart b/flutter-app/lib/bloc/user_bloc.dart
new file mode 100644
index 0000000..8bd6aca
--- /dev/null
+++ b/flutter-app/lib/bloc/user_bloc.dart
@@ -0,0 +1,21 @@
+
+import 'package:flatten/bloc/bloc_provider.dart';
+import 'package:flutter/foundation.dart';
+
+/// this is the user modal, and we can use this to access current user data
+/// once they are logged in
+
+
+class User_Bloc implements BlocBase{
+  User_Bloc({@required this.uid, @required this.preName, @required this.name, @required this.zip});
+  final String uid;
+  final String preName;
+  final String name;
+  final String zip;
+
+  void dispose(){
+    
+  }
+  
+  Map<String, String> get userData => {'uid' : uid, 'preName': preName, 'name': name, 'zip': zip};
+}
diff --git a/flutter-app/lib/main.dart b/flutter-app/lib/main.dart
index c3c7a94..68f0f13 100644
--- a/flutter-app/lib/main.dart
+++ b/flutter-app/lib/main.dart
@@ -16,8 +16,8 @@ void main() {
 class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    return BlocProvider<Auth>(
-        bloc: Auth(),
+    return BlocProvider<Auth_Bloc>(
+        bloc: Auth_Bloc(),
           child:  BlocProvider<HS_Info_Bloc>(
             bloc: HS_Info_Bloc(),
                       child: MaterialApp(
diff --git a/flutter-app/lib/models/api_response.dart b/flutter-app/lib/models/api_response.dart
new file mode 100644
index 0000000..882d37c
--- /dev/null
+++ b/flutter-app/lib/models/api_response.dart
@@ -0,0 +1,7 @@
+class APIResponse<T> {
+  T data;
+  bool error;
+  String errorMessage;
+
+  APIResponse({this.data, this.errorMessage, this.error=false});
+}
\ No newline at end of file
diff --git a/flutter-app/lib/models/qr_code.dart b/flutter-app/lib/models/qr_code.dart
index bac37e1..a4c9dbe 100644
--- a/flutter-app/lib/models/qr_code.dart
+++ b/flutter-app/lib/models/qr_code.dart
@@ -1,21 +1,25 @@
 class QrCode {
-  final String id;
-  final String createDateTime;
-  final String name;
-  final int useCase;
-  final String additionalInformation;
-  final bool active;
-  final int status;
+   String id;
+   String createDateTime;
+   String name;
+   int useCase;
+   String additionalInformation;
+   bool active;
+   int status;
 
-  QrCode(this.id, this.createDateTime, this.name, this.useCase,
-      this.additionalInformation, this.active, this.status);
+  QrCode({this.id, this.createDateTime, this.name, this.useCase,
+      this.additionalInformation, this.active, this.status});
 
-  QrCode.fromJson(Map<String, dynamic> json)
-      : id = json["id"],
-        createDateTime = json["createDateTime"],
-        name = json["name"],
-        useCase = json["useCase"],
-        additionalInformation = json["additionalInformation"],
-        active = json["active"],
-        status = json["status"];
+  factory QrCode.fromJson(Map<String, dynamic> json){
+      return QrCode(
+         id: json["id"],
+        createDateTime: json["createDateTime"],
+        name: json["name"],
+        useCase :json["useCase"],
+        additionalInformation : json["additionalInformation"],
+        active: json["active"],
+        status: json["status"]
+      );
+  
+  }
 }
diff --git a/flutter-app/lib/models/qr_code_add.dart b/flutter-app/lib/models/qr_code_add.dart
new file mode 100644
index 0000000..29bd723
--- /dev/null
+++ b/flutter-app/lib/models/qr_code_add.dart
@@ -0,0 +1,30 @@
+import 'package:flutter/foundation.dart';
+
+class QR_Code_For_Add {
+  String name;
+  int useCase;
+  String gpsPosition;
+  String additionalInformation;
+  bool active;
+  int status;
+
+  QR_Code_For_Add({
+    @required this.name,
+    @required this.useCase,
+    @required this.gpsPosition,
+    @required this.additionalInformation,
+    @required this.active,
+    @required this.status,
+  });
+
+  Map<String, dynamic> toJson() {
+    return {
+      "name": name,
+      "useCase": useCase,
+      "gpsPosition": gpsPosition,
+      "additionalInformation": additionalInformation,
+      "active": active,
+      "status": status
+    };
+  }
+}
diff --git a/flutter-app/lib/services/qr_code_service.dart b/flutter-app/lib/services/qr_code_service.dart
new file mode 100644
index 0000000..3ef4cbd
--- /dev/null
+++ b/flutter-app/lib/services/qr_code_service.dart
@@ -0,0 +1,28 @@
+import 'dart:convert';
+import 'package:flatten/bloc/user_bloc.dart';
+import 'package:flatten/models/api_response.dart';
+import 'package:flatten/models/qr_code.dart';
+import 'package:flatten/models/qr_code_add.dart';
+import 'package:http/http.dart' as http;
+import 'dart:async';
+
+class QR_Code_Service {
+  static const API = 'https://api.flatten-app.de';
+  static const headers = {'Content-Type': 'application/json'};
+
+  Future<APIResponse<QrCode>> upLoadQR(QR_Code_For_Add item) {
+    print('upLoad called');
+    return http
+        .post(API + '/flatten/qr-codes',
+            headers: headers, body: json.encode(item.toJson())).timeout(Duration(seconds: 5))
+        .then((data) {
+      print('statusCode: ' + '${data.statusCode}');
+      if (data.statusCode == 201) {
+        final jsonData = json.decode(data.body);
+        return APIResponse<QrCode>(data: QrCode.fromJson(jsonData));
+      }
+      return APIResponse<QrCode>(error: true, errorMessage: 'An error occured');
+    }).catchError((_) =>
+            APIResponse<QrCode>(error: true, errorMessage: 'An error occured'));
+  }
+}
diff --git a/flutter-app/lib/ui/handshake/handshake_screen.dart b/flutter-app/lib/ui/handshake/handshake_screen.dart
index eda2d7f..deb0b40 100644
--- a/flutter-app/lib/ui/handshake/handshake_screen.dart
+++ b/flutter-app/lib/ui/handshake/handshake_screen.dart
@@ -1,3 +1,4 @@
+import 'package:flatten/bloc/user_bloc.dart';
 import 'package:flutter/material.dart';
 import 'package:flatten/ui/handshake/widgets/camera_view.dart';
 import 'package:line_awesome_icons/line_awesome_icons.dart';
@@ -20,7 +21,7 @@ class HandshakeScreen extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final user = BlocProvider.of<User>(context); //this gives the current logged in user
+    final user = BlocProvider.of<User_Bloc>(context); //this gives the current logged in user
     return SingleChildScrollView(
           child: Container(
         height: MediaQuery.of(context).size.height/1.2,
diff --git a/flutter-app/lib/ui/handshake/widgets/qr_view.dart b/flutter-app/lib/ui/handshake/widgets/qr_view.dart
index a028281..4b088de 100644
--- a/flutter-app/lib/ui/handshake/widgets/qr_view.dart
+++ b/flutter-app/lib/ui/handshake/widgets/qr_view.dart
@@ -1,4 +1,5 @@
 import 'package:flatten/bloc/bloc_provider.dart';
+import 'package:flatten/bloc/user_bloc.dart';
 import 'package:flutter/material.dart';
 import 'package:qr_flutter/qr_flutter.dart';
 import 'package:flatten/bloc/auth_bloc.dart';
@@ -11,7 +12,7 @@ class QrCodeView extends StatelessWidget {
 
 	@override
 	Widget build(BuildContext context) {
-     final user = BlocProvider.of<User>(context); //this gives the current logged in user
+     final user = BlocProvider.of<User_Bloc>(context); //this gives the current logged in user
 		TextStyle titleStyle = TextStyle(
 			fontWeight: FontWeight.bold,
 			fontSize: 24,
@@ -25,7 +26,7 @@ class QrCodeView extends StatelessWidget {
            //earlier this was showing
                 // AppLocalizations.of(context).pvhtitel,
                 //this is changed temporarily to check user login:
-                "Prename: ${user.userData['preName']}\nName: ${user.userData['name']}\nZIP: ${user.userData['zip']}",
+                "uid: ${user.userData['uid']}\nName: ${user.userData['name']}\nZIP: ${user.userData['zip']}",
                 /*Later this can be changed to a unique is for every user, which is stored in the User class
                 and can be accessed though user.userData['uid']
                 */
@@ -34,7 +35,7 @@ class QrCodeView extends StatelessWidget {
 				Padding(
 					padding: const EdgeInsets.only(left: 48, right: 48),
 					child: QrImage(
-						data: "nkldsfkldsfdknflsnkldfs",
+						data: user.userData['uid'],
 						foregroundColor: Color(0xFF08A388),
 					),
 				),
diff --git a/flutter-app/lib/ui/home_page.dart b/flutter-app/lib/ui/home_page.dart
index e2a8093..b031331 100644
--- a/flutter-app/lib/ui/home_page.dart
+++ b/flutter-app/lib/ui/home_page.dart
@@ -1,5 +1,6 @@
 import 'package:flatten/bloc/auth_bloc.dart';
 import 'package:flatten/bloc/bloc_provider.dart';
+import 'package:flatten/bloc/user_bloc.dart';
 import 'package:flutter/material.dart';
 import 'package:flatten/ui/create/create_qr_screen.dart';
 import 'encounters/encounter_list_screen.dart';
@@ -12,7 +13,7 @@ import 'package:flatten/ui/handshake/handshake_decider.dart';
 
 class HomePage extends StatefulWidget {
   HomePage({@required this.user});
-  User user;
+  User_Bloc user;
   @override
   _HomePageState createState() => _HomePageState();
 }
@@ -56,7 +57,7 @@ class _HomePageState extends State<HomePage> {
         break;
     }
 
-    return BlocProvider<User>(
+    return BlocProvider<User_Bloc>(
       bloc: widget.user,
           child: Scaffold(
         appBar: AppBar(
diff --git a/flutter-app/lib/ui/landing_page.dart b/flutter-app/lib/ui/landing_page.dart
index c001a94..b52c323 100644
--- a/flutter-app/lib/ui/landing_page.dart
+++ b/flutter-app/lib/ui/landing_page.dart
@@ -1,5 +1,6 @@
 import 'package:flatten/bloc/bloc_provider.dart';
 import 'package:flatten/bloc/hs_info_block.dart';
+import 'package:flatten/bloc/user_bloc.dart';
 import 'home_page.dart';
 import 'package:flutter/material.dart';
 import 'package:flatten/bloc/auth_bloc.dart';
@@ -9,7 +10,7 @@ import 'package:flatten/ui/sign_in_page.dart';
 class LandingPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    final Auth auth = BlocProvider.of<Auth>(context);
+    final Auth_Bloc auth = BlocProvider.of<Auth_Bloc>(context);
     return StreamBuilder(
       stream: auth.userStream,
       initialData: null,
@@ -17,7 +18,7 @@ class LandingPage extends StatelessWidget {
       //  this can be used to show a progress indicator when we authenticate from database,
       //  we can un-comment this.
       //  if(snapshot.connectionState == ConnectionState.active){
-          User user = snapshot.data;
+          User_Bloc user = snapshot.data;
           if(user == null){
             return SignInPage();
           }
diff --git a/flutter-app/lib/ui/sign_in_page.dart b/flutter-app/lib/ui/sign_in_page.dart
index a819568..dace629 100644
--- a/flutter-app/lib/ui/sign_in_page.dart
+++ b/flutter-app/lib/ui/sign_in_page.dart
@@ -5,6 +5,9 @@ import 'sign_in_components/validator.dart';
 import 'sign_in_components/constants.dart';
 import 'sign_in_components/information_texts.dart';
 import 'package:flatten/bloc/auth_bloc.dart';
+import 'package:flatten/services/qr_code_service.dart';
+import 'package:flatten/models/qr_code_add.dart';
+
 
 class SignInPage extends StatefulWidget with FeildValidator {
   @override
@@ -12,6 +15,7 @@ class SignInPage extends StatefulWidget with FeildValidator {
 }
 
 class _SignInPageState extends State<SignInPage> {
+
   String get _preName => _preNameController.text;
 
   String get _name => _nameController.text;
@@ -28,7 +32,7 @@ class _SignInPageState extends State<SignInPage> {
 
   bool _submitted = false;
 
-  void _submit() {
+  void _submit() async {
     ///this method signs in the user only if all the feilds are valid
     ///we dont have to add the sign in logic here, we have to do that in the Auth()
     ///class in the 'services' directory
@@ -38,102 +42,108 @@ class _SignInPageState extends State<SignInPage> {
     if (widget.zipValidator.isValid(_zip) &&
         widget.nameValidator.isValid(_name) &&
         widget.preNameValidator.isValid(_preName)) {
-      final Auth auth = BlocProvider.of<Auth>(context);
-      auth.signIn('some uid', _preName, _name, _zip);
+       final Auth_Bloc auth = BlocProvider.of<Auth_Bloc>(context);
+       auth.signIn(_preName, _name, _zip);
     }
   }
 
   @override
   Widget build(BuildContext context) {
-    final Auth auth = BlocProvider.of<Auth>(context);
-    return Scaffold(
-        body: SingleChildScrollView(
-      child: Container(
-        width: MediaQuery.of(context).size.width,
-        height: MediaQuery.of(context).size.height,
-        color: Color(0xFF88c7bc),
-        child: Column(
-          mainAxisAlignment: MainAxisAlignment.center,
-          crossAxisAlignment: CrossAxisAlignment.center,
-          children: <Widget>[
-            Spacer(
-              flex: 3,
-            ),
-            informationText(
-                'Scan your QR-Code which you have received by post', 250),
-            Spacer(
-              flex: 1,
-            ),
-            CustomRaisedButton(
-              color: Color(0xff408aff),
-              child: Text(
-                'Scan QR-Code',
-                style: TextStyle(fontSize: 20),
+    final Auth_Bloc auth = BlocProvider.of<Auth_Bloc>(context);
+    return StreamBuilder(
+        stream: auth.isAuthenticationStream,
+        initialData: AuthState(errorOccured: false,inProgress: false),
+        builder: (context, snapshot) => snapshot.data.inProgress == true && snapshot.data.errorOccured == false? 
+        Scaffold(body: Center(child: CircularProgressIndicator(),),)
+        : Scaffold(
+          body: SingleChildScrollView(
+        child: Container(
+          width: MediaQuery.of(context).size.width,
+          height: MediaQuery.of(context).size.height,
+          color: Color(0xFF88c7bc),
+          child: Column(
+            mainAxisAlignment: MainAxisAlignment.center,
+            crossAxisAlignment: CrossAxisAlignment.center,
+            children: <Widget>[
+              Spacer(
+                flex: 3,
+              ),
+              informationText(
+                  'Scan your QR-Code which you have received by post', 250),
+              Spacer(
+                flex: 1,
+              ),
+              CustomRaisedButton(
+                color: Color(0xff408aff),
+                child: Text(
+                  'Scan QR-Code',
+                  style: TextStyle(fontSize: 20),
+                ),
+                borderRadius: 50,
+                onPressed: () {},
+              ),
+              Spacer(
+                flex: 2,
+              ),
+              informationText(
+                  'You haven\'t received any post yer, or lost it?\nNo problem. Generate your new code here:',
+                  320),
+              Spacer(
+                flex: 1,
+              ),
+              SizedBox(width: 300, height: 80, child: _buildPreNameTextFeild()),
+              Spacer(
+                flex: 1,
               ),
-              borderRadius: 50,
-              onPressed: () {},
-            ),
-            Spacer(
-              flex: 2,
-            ),
-            informationText(
-                'You haven\'t received any post yer, or lost it?\nNo problem. Generate your new code here:',
-                320),
-            Spacer(
-              flex: 1,
-            ),
-            SizedBox(width: 300, height: 80, child: _buildPreNameTextFeild()),
-            Spacer(
-              flex: 1,
-            ),
-            SizedBox(width: 300, height: 80, child: _buildnameTextFeild()),
-            Spacer(
-              flex: 1,
-            ),
-            SizedBox(width: 300, height: 80, child: _buildZipTextFeild()),
-            Spacer(
-              flex: 1,
-            ),
-            CustomRaisedButton(
-              color: Color(0xff408aff),
-              child: Text(
-                'Generate',
-                style: TextStyle(fontSize: 20),
+              SizedBox(width: 300, height: 80, child: _buildnameTextFeild()),
+              Spacer(
+                flex: 1,
               ),
-              borderRadius: 50,
-              onPressed: () {
-                _submit();
-              },
-            ),
-            Spacer(
-              flex: 2,
-            ),
-            SizedBox(
-              width: 300,
-              child: Row(
-                children: <Widget>[
-                  Expanded(
-                    child: informationText(
-                        'What about people who do not have a smartphone', 200),
-                  ),
-                  IconButton(
-                    icon: Icon(
-                      Icons.help,
-                      size: 50,
-                      color: Colors.white,
+              SizedBox(width: 300, height: 80, child: _buildZipTextFeild()),
+              Spacer(
+                flex: 1,
+              ),
+              CustomRaisedButton(
+                color: Color(0xff408aff),
+                child: Text(
+                  'Generate',
+                  style: TextStyle(fontSize: 20),
+                ),
+                borderRadius: 50,
+                onPressed: () {
+                  _submit();
+                },
+              ),
+              Spacer(
+                flex: 2,
+              ),
+              SizedBox(
+                width: 300,
+                child: Row(
+                  children: <Widget>[
+                    Expanded(
+                      child: informationText(
+                          'What about people who do not have a smartphone', 200),
                     ),
-                    onPressed: () {},
-                  ),
-                ],
+                    IconButton(
+                      icon: Icon(
+                        Icons.help,
+                        size: 50,
+                        color: Colors.white,
+                      ),
+                      onPressed: () {},
+                    ),
+                  ],
+                ),
+              ),
+              Spacer(
+                flex: 1,
               ),
-            ),
-            Spacer(
-              flex: 1,
-            ),
-          ],
+            ],
+          ),
         ),
-      ),
-    ));
+      )),
+    );
   }
 
   TextField _buildZipTextFeild() {