diff --git a/backend/src/auth/auth.ts b/backend/src/auth/auth.ts
new file mode 100644
index 000000000..0d9014b15
--- /dev/null
+++ b/backend/src/auth/auth.ts
@@ -0,0 +1,21 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+
+import { AuthChecker } from 'type-graphql'
+import decode from '../jwt/decode'
+import { apiGet } from '../apis/loginAPI'
+import CONFIG from '../config'
+
+/* eslint-disable-next-line @typescript-eslint/no-unused-vars */
+export const isAuthorized: AuthChecker<any> = async ({ root, args, context, info }, roles) => {
+  if (context.token) {
+    const decoded = decode(context.token)
+    if (decoded.sessionId && decoded.sessionId !== 0) {
+      const result = await apiGet(
+        `${CONFIG.LOGIN_API_URL}checkSessionState?session_id=${decoded.sessionId}`,
+      )
+      context.sessionId = decoded.sessionId
+      return result.success
+    }
+  }
+  return false
+}
diff --git a/backend/src/graphql/inputs/GdtInputs.ts b/backend/src/graphql/inputs/GdtInputs.ts
index 1404fbf14..e11ce24c1 100644
--- a/backend/src/graphql/inputs/GdtInputs.ts
+++ b/backend/src/graphql/inputs/GdtInputs.ts
@@ -17,9 +17,6 @@ export class GdtTransactionInput {
 
 @ArgsType()
 export class GdtTransactionSessionIdInput {
-  @Field(() => Number)
-  sessionId: number
-
   @Field(() => Int, { nullable: true })
   currentPage?: number
 
diff --git a/backend/src/graphql/inputs/LoginUserInput.ts b/backend/src/graphql/inputs/LoginUserInput.ts
index 716b19403..4a60d00e1 100644
--- a/backend/src/graphql/inputs/LoginUserInput.ts
+++ b/backend/src/graphql/inputs/LoginUserInput.ts
@@ -41,9 +41,6 @@ export class ChangePasswordArgs {
 
 @ArgsType()
 export class UpdateUserInfosArgs {
-  @Field(() => Number)
-  sessionId!: number
-
   @Field(() => String)
   email!: string
 
diff --git a/backend/src/graphql/inputs/TransactionInput.ts b/backend/src/graphql/inputs/TransactionInput.ts
index 7f83cd82d..a62d86a65 100644
--- a/backend/src/graphql/inputs/TransactionInput.ts
+++ b/backend/src/graphql/inputs/TransactionInput.ts
@@ -2,9 +2,6 @@ import { ArgsType, Field, Int } from 'type-graphql'
 
 @ArgsType()
 export class TransactionListInput {
-  @Field(() => Number)
-  sessionId: number
-
   @Field(() => Int)
   firstPage: number
 
@@ -17,9 +14,6 @@ export class TransactionListInput {
 
 @ArgsType()
 export class TransactionSendArgs {
-  @Field(() => Number)
-  sessionId: number
-
   @Field(() => String)
   email: string
 
diff --git a/backend/src/graphql/models/GdtEntry.ts b/backend/src/graphql/models/GdtEntry.ts
index 09ee35a70..7935d4181 100644
--- a/backend/src/graphql/models/GdtEntry.ts
+++ b/backend/src/graphql/models/GdtEntry.ts
@@ -15,6 +15,7 @@ export enum GdtEntryType {
 @ObjectType()
 export class GdtEntry {
   constructor(json: any) {
+    this.id = json.id
     this.amount = json.amount
     this.date = json.date
     this.email = json.email
@@ -27,6 +28,9 @@ export class GdtEntry {
     this.gdt = json.gdt
   }
 
+  @Field(() => Number)
+  id: number
+
   @Field(() => Number)
   amount: number
 
diff --git a/backend/src/graphql/models/LoginResponse.ts b/backend/src/graphql/models/LoginResponse.ts
deleted file mode 100644
index 258784b75..000000000
--- a/backend/src/graphql/models/LoginResponse.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-/* eslint-disable @typescript-eslint/no-explicit-any */
-/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
-import { ObjectType, Field } from 'type-graphql'
-import { User } from './User'
-
-// temporaray solution until we have JWT implemented
-
-@ObjectType()
-export class LoginResponse {
-  constructor(json: any) {
-    this.sessionId = json.session_id
-    this.user = new User(json.user)
-  }
-
-  @Field(() => Number)
-  sessionId: number
-
-  @Field(() => User)
-  user: User
-}
diff --git a/backend/src/graphql/resolvers/BalanceResolver.ts b/backend/src/graphql/resolvers/BalanceResolver.ts
index 1eea71e66..aafa767b0 100644
--- a/backend/src/graphql/resolvers/BalanceResolver.ts
+++ b/backend/src/graphql/resolvers/BalanceResolver.ts
@@ -1,13 +1,17 @@
-import { Resolver, Query, /* Mutation, */ Arg } from 'type-graphql'
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
+
+import { Resolver, Query, Ctx, Authorized } from 'type-graphql'
 import CONFIG from '../../config'
 import { Balance } from '../models/Balance'
 import { apiGet } from '../../apis/HttpRequest'
 
 @Resolver()
 export class BalanceResolver {
+  @Authorized()
   @Query(() => Balance)
-  async balance(@Arg('sessionId') sessionId: number): Promise<Balance> {
-    const result = await apiGet(CONFIG.COMMUNITY_API_URL + 'getBalance/' + sessionId)
+  async balance(@Ctx() context: any): Promise<Balance> {
+    const result = await apiGet(CONFIG.COMMUNITY_API_URL + 'getBalance/' + context.sessionId)
     if (!result.success) throw new Error(result.data)
     return new Balance(result.data)
   }
diff --git a/backend/src/graphql/resolvers/GdtResolver.ts b/backend/src/graphql/resolvers/GdtResolver.ts
index 6ff8b7ae4..18365e9f9 100644
--- a/backend/src/graphql/resolvers/GdtResolver.ts
+++ b/backend/src/graphql/resolvers/GdtResolver.ts
@@ -1,5 +1,7 @@
-// import jwt from 'jsonwebtoken'
-import { Resolver, Query, /* Mutation, */ Args } from 'type-graphql'
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
+
+import { Resolver, Query, Args, Ctx, Authorized } from 'type-graphql'
 import CONFIG from '../../config'
 import { GdtEntryList } from '../models/GdtEntryList'
 import { GdtTransactionSessionIdInput } from '../inputs/GdtInputs'
@@ -7,14 +9,16 @@ import { apiGet } from '../../apis/HttpRequest'
 
 @Resolver()
 export class GdtResolver {
+  @Authorized()
   @Query(() => GdtEntryList)
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   async listGDTEntries(
     @Args()
-    { currentPage = 1, pageSize = 5, order = 'DESC', sessionId }: GdtTransactionSessionIdInput,
+    { currentPage = 1, pageSize = 5, order = 'DESC' }: GdtTransactionSessionIdInput,
+    @Ctx() context: any,
   ): Promise<GdtEntryList> {
     const result = await apiGet(
-      `${CONFIG.COMMUNITY_API_URL}listGDTTransactions/${currentPage}/${pageSize}/${order}/${sessionId}`,
+      `${CONFIG.COMMUNITY_API_URL}listGDTTransactions/${currentPage}/${pageSize}/${order}/${context.sessionId}`,
     )
     if (!result.success) {
       throw new Error(result.data)
diff --git a/backend/src/graphql/resolvers/TransactionResolver.ts b/backend/src/graphql/resolvers/TransactionResolver.ts
index 40dd9eb6f..d18c7c300 100644
--- a/backend/src/graphql/resolvers/TransactionResolver.ts
+++ b/backend/src/graphql/resolvers/TransactionResolver.ts
@@ -1,4 +1,7 @@
-import { Resolver, Query, Args } from 'type-graphql'
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
+
+import { Resolver, Query, Args, Authorized, Ctx } from 'type-graphql'
 import CONFIG from '../../config'
 import { TransactionList } from '../models/Transaction'
 import { TransactionListInput, TransactionSendArgs } from '../inputs/TransactionInput'
@@ -6,23 +9,27 @@ import { apiGet, apiPost } from '../../apis/HttpRequest'
 
 @Resolver()
 export class TransactionResolver {
+  @Authorized()
   @Query(() => TransactionList)
   async transactionList(
-    @Args() { sessionId, firstPage = 1, items = 25, order = 'DESC' }: TransactionListInput,
+    @Args() { firstPage = 1, items = 25, order = 'DESC' }: TransactionListInput,
+    @Ctx() context: any,
   ): Promise<TransactionList> {
     const result = await apiGet(
-      `${CONFIG.COMMUNITY_API_URL}listTransactions/${firstPage}/${items}/${order}/${sessionId}`,
+      `${CONFIG.COMMUNITY_API_URL}listTransactions/${firstPage}/${items}/${order}/${context.sessionId}`,
     )
     if (!result.success) throw new Error(result.data)
     return new TransactionList(result.data)
   }
 
+  @Authorized()
   @Query(() => String)
   async sendCoins(
-    @Args() { sessionId, email, amount, memo }: TransactionSendArgs,
+    @Args() { email, amount, memo }: TransactionSendArgs,
+    @Ctx() context: any,
   ): Promise<string> {
     const payload = {
-      session_id: sessionId,
+      session_id: context.sessionId,
       target_email: email,
       amount: amount * 10000,
       memo,
diff --git a/backend/src/graphql/resolvers/UserResolver.ts b/backend/src/graphql/resolvers/UserResolver.ts
index 87979c353..4d887286b 100644
--- a/backend/src/graphql/resolvers/UserResolver.ts
+++ b/backend/src/graphql/resolvers/UserResolver.ts
@@ -1,8 +1,9 @@
-// import jwt from 'jsonwebtoken'
-import { Resolver, Query, Args, Arg, UseMiddleware } from 'type-graphql'
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
+import { Resolver, Query, Args, Arg, Authorized, Ctx, UseMiddleware } from 'type-graphql'
 import CONFIG from '../../config'
 import { CheckUsernameResponse } from '../models/CheckUsernameResponse'
-import { LoginResponse } from '../models/LoginResponse'
+import { User } from '../models/User'
 import { LoginViaVerificationCode } from '../models/LoginViaVerificationCode'
 import { SendPasswordResetEmailResponse } from '../models/SendPasswordResetEmailResponse'
 import { UpdateUserInfosResponse } from '../models/UpdateUserInfosResponse'
@@ -16,13 +17,14 @@ import {
 import { apiPost, apiGet } from '../../apis/HttpRequest'
 import { KlicktippController } from '../../apis/KlicktippController'
 import { registerMiddleware } from '../../middleware/registerMiddleware'
+import encode from '../../jwt/encode'
 
 @Resolver()
 export class UserResolver {
   private connector: KlicktippController = new KlicktippController(CONFIG.KLICKTTIPP_API_URL)
 
-  @Query(() => LoginResponse)
-  async login(@Args() { email, password }: UnsecureLoginArgs): Promise<LoginResponse> {
+  @Query(() => String)
+  async login(@Args() { email, password }: UnsecureLoginArgs): Promise<string> {
     email = email.trim().toLowerCase()
     const result = await apiPost(CONFIG.LOGIN_API_URL + 'unsecureLogin', { email, password })
 
@@ -31,21 +33,10 @@ export class UserResolver {
       throw new Error(result.data)
     }
 
-    // temporary solution until we have JWT implemented
-    return new LoginResponse(result.data)
-
-    // create and return the json web token
-    // The expire doesn't help us here. The client needs to track when the token expires on its own,
-    // since every action prolongs the time the session is valid.
-    /*
-    return jwt.sign(
-      { result, role: 'todo' },
-      CONFIG.JWT_SECRET, // * , { expiresIn: CONFIG.JWT_EXPIRES_IN } ,
-    )
-    */
-    // return (await apiPost(CONFIG.LOGIN_API_URL + 'unsecureLogin', login)).result.data
-    // const loginResult: LoginResult = await loginAPI.login(data)
-    // return loginResult.user ? loginResult.user : new User()
+    const data = result.data
+    const sessionId = data.session_id
+    delete data.session_id
+    return encode({ sessionId, user: new User(data.user) })
   }
 
   @Query(() => LoginViaVerificationCode)
@@ -63,9 +54,10 @@ export class UserResolver {
     return new LoginViaVerificationCode(result.data)
   }
 
+  @Authorized()
   @Query(() => String)
-  async logout(@Arg('sessionId') sessionId: number): Promise<string> {
-    const payload = { session_id: sessionId }
+  async logout(@Ctx() context: any): Promise<string> {
+    const payload = { session_id: context.sessionId }
     const result = await apiPost(CONFIG.LOGIN_API_URL + 'logout', payload)
     if (!result.success) {
       throw new Error(result.data)
@@ -128,11 +120,11 @@ export class UserResolver {
     return 'sucess'
   }
 
+  @Authorized()
   @Query(() => UpdateUserInfosResponse)
   async updateUserInfos(
     @Args()
     {
-      sessionId,
       email,
       firstName,
       lastName,
@@ -142,9 +134,10 @@ export class UserResolver {
       password,
       passwordNew,
     }: UpdateUserInfosArgs,
+    @Ctx() context: any,
   ): Promise<UpdateUserInfosResponse> {
     const payload = {
-      session_id: sessionId,
+      session_id: context.sessionId,
       email,
       update: {
         'User.first_name': firstName || undefined,
diff --git a/backend/src/index.ts b/backend/src/index.ts
index 6e51ed2f4..067403508 100644
--- a/backend/src/index.ts
+++ b/backend/src/index.ts
@@ -1,3 +1,5 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+
 import 'reflect-metadata'
 import express from 'express'
 import { buildSchema } from 'type-graphql'
@@ -8,17 +10,30 @@ import connection from './database/connection'
 import CONFIG from './config'
 
 // TODO move to extern
-// import { BookResolver } from './graphql/resolvers/BookResolver'
 import { UserResolver } from './graphql/resolvers/UserResolver'
 import { BalanceResolver } from './graphql/resolvers/BalanceResolver'
 import { GdtResolver } from './graphql/resolvers/GdtResolver'
 import { TransactionResolver } from './graphql/resolvers/TransactionResolver'
 
+import { isAuthorized } from './auth/auth'
+
 // TODO implement
 // import queryComplexity, { simpleEstimator, fieldConfigEstimator } from "graphql-query-complexity";
 
 const DB_VERSION = '0001-init_db'
 
+const context = (req: any) => {
+  const authorization = req.req.headers.authorization
+  let token = null
+  if (authorization) {
+    token = req.req.headers.authorization.replace(/^Bearer /, '')
+  }
+  const context = {
+    token,
+  }
+  return context
+}
+
 async function main() {
   // check for correct database version
   const con = await connection()
@@ -34,6 +49,7 @@ async function main() {
   // const connection = await createConnection()
   const schema = await buildSchema({
     resolvers: [UserResolver, BalanceResolver, TransactionResolver, GdtResolver],
+    authChecker: isAuthorized,
   })
 
   // Graphiql interface
@@ -46,7 +62,7 @@ async function main() {
   const server = express()
 
   // Apollo Server
-  const apollo = new ApolloServer({ schema, playground })
+  const apollo = new ApolloServer({ schema, playground, context })
   apollo.applyMiddleware({ app: server })
 
   // Start Server
diff --git a/backend/src/jwt/decode.ts b/backend/src/jwt/decode.ts
new file mode 100644
index 000000000..a414e0c41
--- /dev/null
+++ b/backend/src/jwt/decode.ts
@@ -0,0 +1,23 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
+
+import jwt from 'jsonwebtoken'
+import CONFIG from '../config/'
+
+export default (token: string): any => {
+  if (!token) return null
+  let sessionId = null
+  const email = null
+  try {
+    const decoded = jwt.verify(token, CONFIG.JWT_SECRET)
+    sessionId = decoded.sub
+    // email = decoded.email
+    return {
+      token,
+      sessionId,
+      email,
+    }
+  } catch (err) {
+    return null
+  }
+}
diff --git a/backend/src/jwt/encode.ts b/backend/src/jwt/encode.ts
new file mode 100644
index 000000000..477644dc7
--- /dev/null
+++ b/backend/src/jwt/encode.ts
@@ -0,0 +1,18 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
+
+import jwt from 'jsonwebtoken'
+import CONFIG from '../config/'
+
+// Generate an Access Token
+export default function encode(data: any): string {
+  const { user, sessionId } = data
+  const { email, language, firstName, lastName } = user
+  const token = jwt.sign({ email, language, firstName, lastName, sessionId }, CONFIG.JWT_SECRET, {
+    expiresIn: CONFIG.JWT_EXPIRES_IN,
+    // issuer: CONFIG.GRAPHQL_URI,
+    // audience: CONFIG.CLIENT_URI,
+    subject: sessionId.toString(),
+  })
+  return token
+}
diff --git a/community_server/src/Template/StateBalances/overview_gdt.ctp b/community_server/src/Template/StateBalances/overview_gdt.ctp
index eb67626b0..f076e26c8 100644
--- a/community_server/src/Template/StateBalances/overview_gdt.ctp
+++ b/community_server/src/Template/StateBalances/overview_gdt.ctp
@@ -21,7 +21,7 @@ $this->assign('title', __('GDT Kontoübersicht'));
 $header = '<h3>' . __('Zur Verfügung: ') . '</h3>';
 
 if($gdtSum > 0){
-  $header .= '<h2>'.$this->element('printGDT', ['number' => $gdtSum]).'</h2>';
+  $header .= '<h2>'.$this->element('printGDT', ['number' => $gdtSum*100.0]).'</h2>';
 }
 if($moreEntrysAsShown) {
   $header .= '<span>'. __('Nur die letzten 100 Einträge werden angezeigt!') . '</span>';
@@ -56,7 +56,7 @@ $this->assign('header', $header);
         <?= $this->Number->format($entry['factor2']) ?>
       <?php endif; ?>
       </div>
-      <div class="cell c3"><?= $this->element('printGDT', ['number' => $entry['gdt']]) ?></div>
+      <div class="cell c3"><?= $this->element('printGDT', ['number' => $entry['gdt']*100.0]) ?></div>
     </div>
     <?php endforeach; ?>
   </div>
@@ -98,7 +98,7 @@ $this->assign('header', $header);
           <?= $this->Number->format($gdtEntry['factor2']) ?>
         <?php endif; ?>
       </div>
-      <div class="cell c3"><?= $this->element('printGDT', ['number' => $gdtEntry['gdt']]) ?></div>
+      <div class="cell c3"><?= $this->element('printGDT', ['number' => $gdtEntry['gdt'] * 100.0]) ?></div>
     </div>
     <?php endforeach; ?>
   </div>
diff --git a/docu/Concepts/Snippets/1-Blockchain/Roles.md b/docu/Concepts/Snippets/1-Blockchain/Roles.md
new file mode 100644
index 000000000..d21b3814a
--- /dev/null
+++ b/docu/Concepts/Snippets/1-Blockchain/Roles.md
@@ -0,0 +1,53 @@
+# Roles
+User Roles also handled by blockchain and node servers
+
+My Goal is to save not only the gradido transactions in blockchain but also 
+who is allowed to create new gradidos,
+who allow joining new user to the group,
+who allow connect to another group and 
+how the community decide which one is allowed to do this things.
+
+## Why?
+If this would be handled only by community-server everyone could be easly 
+overwrite this rules by using a modified client to send his transactions direct over
+hedera or iota bypassing the community-server rules. 
+With hedera it is possible to only allow sending messages to a topic with the correct admin key,
+but then is the admin the single point of failure. Also must the key saved on server to allow everyone 
+sending gradidos or the transactions will only be proccessed, when admin is logging in.
+If we don't use blockchain technologie at all, we have a big single point of failure. 
+The Community-Server and everyone who has direct access to server and the admins of course.
+But it would be much much simpler of course :)
+
+In summary it is to make sure that the community is in power and no one can take over.
+
+## How?
+There is a special type of transactions with which users determine who can determine what.
+This transaction control which signatures are neccessary for things like creation and so one.
+For this I think different types are needed.
+- *one*: The founder of group (or someone other choosen) decide everything, this is default from start
+- *some*: a number of user must sign, set absolute count or relative count
+- *most*: more than 1/2 or 3/4 must sign
+- *all*: all member must sign, default for choose which mode will be used 
+- *one-council*: one member of council
+- *some-council*: absolute or relative number of council members must sign
+- *most-council*: more than 1/2 or 3/4 from council members must sign
+- *all-council*: all members of council must sign
+
+this configuration can be done for different types of action,
+so the voting-mode for creation may differ from voting mode for
+add new members to community. Also the council members for different actions
+may differ.
+Also how to vote for council members is an extra type of action.
+
+## Veto
+Especially for *some* and *some-council* maybe also for other types.
+The users there could vote but haven't yet and not all need to vote,
+can make a Veto with Explanation which reset all existing signs of current vote,
+and is needed to sign by all which again vote for the case.
+
+## Summary
+With that setup all community consense models should be possible except Democracy.
+Democracy needs a secret ballot. The votes on blockchain are open (at least if someone knows which 
+public-key belongs to which user). A secret ballot on blockchain is really hard. By my last
+recherche I haven't found on. But maybe this can do the trick: https://secure.vote/
+
diff --git a/docu/Concepts/Snippets/Iota/ColoredCoins.md b/docu/Concepts/Snippets/Iota/ColoredCoins.md
new file mode 100644
index 000000000..33d3a891e
--- /dev/null
+++ b/docu/Concepts/Snippets/Iota/ColoredCoins.md
@@ -0,0 +1,42 @@
+# Wie Colored Coins in Iota funktionieren
+## Schöpfung
+- Colored Coins werden bei Iota mit einer speziellen Transaktion erzeugt
+- Die Farbe des neuen Coins wird durch den Transaktionshash beschrieben
+- Die einmal erzeugte Menge von Colored Coins ist fest
+- Um die Menge zu erhöhen müssten neue Colored Coin erzeugt werden und die alten damit ausgetauscht werden (z.B. mittels SmartContract)
+
+## Geldmenge
+- Colored Coins basierend auf den normalen Iota-Coins somit werden soviele Iota-Coins benötigt wie man Colored-Coins braucht
+- 2.779.530.283.000.000 Iota maximale Coinmenge
+- Weltbevölkerung 2021: 7.915.559.780
+- Pro Kopf Geldmenge Gradido: 53.476
+- Benötigte Iota Coins für Gradido mit 4 Nachkommastellen mit 25% Puffer: 
+- 7.915.559.780 * 534.760.000 * 1.25 = 5.291.155.935.000.000.000
+- Vorhandene Iota coins:                   2.779.530.283.000.000
+- Es sind nicht genügend Iota Coins vorhanden im die ganze Welt mit Gradido auf Basis von Iota versorgen zu können
+
+## Kosten 
+- Kurs am 30.08.2021: 1 Miota = 0,84
+- Bei Verwendung von 4 Nachkommastellen braucht es 10 Miota für 1.000 Colored Coins (Gradido) also Miota im Wert von 8,40€
+- Aktuell (30.08.2021) geschöpfte Gradido Cent: 17.001.990.500
+- Notwendige Miota: 17.002.0, Wert: 14.286,73 €
+- Solange die Benutzer Kontrolle über ihre Keys haben können sie mit einem regulärem Iota Wallet die Gradidos wieder in Iota umwandeln (um z.B. der Vergänglichkeit zu entgehen)
+- Mit 2 Nachkommastellen wird die Vergänglichkeit schon bei 100 Gradido und 1 Stunde ungenau 
+- 1 Stunde,	100 Gradido, Vergänglichkeit: 0,00576, Gradidos nach einer Stunde: 99,99424 GDD
+- 1 Minute,	100 Gradido, Vergänglichkeit: 0,000096, Gradidos nach einer Minute:	99,999904 GDD
+
+## Dust-Protection
+- Iota erlaubt bei leeren Adressen nur Transaktionen von mindestens 1 Miota
+- Nachdem 1 Miota da ist sind bis zu 10 Transaktione < 1 Miota erlaubt, bevor ein weitere Transaktion mit mindestens 1 Miota eingehen muss
+- Bei Verwendung von 4 Nachkommastellen entspricht das 100 GDD, bei 2 Nachkommastellen 10.000 GDD
+
+## Lösung
+Wir können nur 3 Nachkommastellen verwenden. 
+### Kosten
+- 0,84 € für 1.000 GDD
+- 1.428 Euro für alle bisherigen geschöpften Gradidos
+### Dust-Protection
+- 1.000 GDD entspricht 1 Miota, die erste Schöpfung muss also zwangsläufig 1k Gradido betragen
+- Jeder kann nur maximal 10 Transaktionen < 1k GDD empfangen bevor er die GDD weitergesendet haben muss um neue erhalten zu können oder eine neue Schöpfung von 1k GDD bekommen hat
+
+
diff --git a/docu/Concepts/Snippets/images/classes.drawio b/docu/Concepts/Snippets/images/classes.drawio
new file mode 100644
index 000000000..ad4f88aa2
--- /dev/null
+++ b/docu/Concepts/Snippets/images/classes.drawio
@@ -0,0 +1 @@
+<mxfile host="7d619c52-f8a9-4b9d-82fe-1aa45d350dea" modified="2021-08-07T11:49:26.921Z" agent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Code/1.58.2 Chrome/89.0.4389.128 Electron/12.0.13 Safari/537.36" etag="5tat3B3yItVGc6mcvaQ1" version="12.2.4" pages="1"><diagram id="1SuIEZF2QCnWeueF3Zz_" name="Page-1">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</diagram></mxfile>
\ No newline at end of file
diff --git a/docu/Concepts/Snippets/images/classes.png b/docu/Concepts/Snippets/images/classes.png
new file mode 100644
index 000000000..1cf30c437
Binary files /dev/null and b/docu/Concepts/Snippets/images/classes.png differ
diff --git a/docu/Concepts/Snippets/images/example_blockchain.drawio b/docu/Concepts/Snippets/images/example_blockchain.drawio
new file mode 100644
index 000000000..ac043b21b
--- /dev/null
+++ b/docu/Concepts/Snippets/images/example_blockchain.drawio
@@ -0,0 +1 @@
+<mxfile host="11f51089-224b-4c51-8025-2a587ac1ee54" modified="2021-08-08T15:21:15.636Z" agent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Code/1.58.2 Chrome/89.0.4389.128 Electron/12.0.13 Safari/537.36" etag="Ph0quYraKNcgZ1LpaOqw" version="12.2.4" pages="1"><diagram id="svTVmLC50Oi8Ao2eC_wi" name="Page-1">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</diagram></mxfile>
\ No newline at end of file
diff --git a/docu/Concepts/Snippets/images/example_blockchain.png b/docu/Concepts/Snippets/images/example_blockchain.png
new file mode 100644
index 000000000..f2771b388
Binary files /dev/null and b/docu/Concepts/Snippets/images/example_blockchain.png differ
diff --git a/docu/Concepts/Snippets/images/iota.drawio b/docu/Concepts/Snippets/images/iota.drawio
new file mode 100644
index 000000000..5e491aefa
--- /dev/null
+++ b/docu/Concepts/Snippets/images/iota.drawio
@@ -0,0 +1 @@
+<mxfile host="c8c9d8b1-9d45-405b-9350-947d02163aae" modified="2021-08-13T14:14:22.645Z" agent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Code/1.59.0 Chrome/91.0.4472.124 Electron/13.1.7 Safari/537.36" etag="M5WsFcVCZVYdDRxEgPr7" version="12.2.4" pages="1"><diagram id="4VYGDKFA-XGvTikjH5B0" name="Page-1">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</diagram></mxfile>
\ No newline at end of file
diff --git a/docu/Concepts/Snippets/images/iota.png b/docu/Concepts/Snippets/images/iota.png
new file mode 100644
index 000000000..b8f7fb7e5
Binary files /dev/null and b/docu/Concepts/Snippets/images/iota.png differ
diff --git a/frontend/package.json b/frontend/package.json
index 4bc621916..59b34cc9d 100755
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -72,6 +72,7 @@
     "vue-good-table": "^2.21.3",
     "vue-i18n": "^8.22.4",
     "vue-jest": "^3.0.7",
+    "vue-jwt-decode": "^0.1.0",
     "vue-loading-overlay": "^3.4.2",
     "vue-moment": "^4.1.0",
     "vue-qrcode": "^0.3.5",
diff --git a/frontend/src/components/LanguageSwitch.spec.js b/frontend/src/components/LanguageSwitch.spec.js
index 72771bd37..afe98b357 100644
--- a/frontend/src/components/LanguageSwitch.spec.js
+++ b/frontend/src/components/LanguageSwitch.spec.js
@@ -15,7 +15,6 @@ describe('LanguageSwitch', () => {
   let wrapper
 
   const state = {
-    sessionId: 1234,
     email: 'he@ho.he',
     language: null,
   }
@@ -123,7 +122,6 @@ describe('LanguageSwitch', () => {
         expect(updateUserInfosQueryMock).toBeCalledWith(
           expect.objectContaining({
             variables: {
-              sessionId: 1234,
               email: 'he@ho.he',
               locale: 'en',
             },
@@ -136,7 +134,6 @@ describe('LanguageSwitch', () => {
         expect(updateUserInfosQueryMock).toBeCalledWith(
           expect.objectContaining({
             variables: {
-              sessionId: 1234,
               email: 'he@ho.he',
               locale: 'de',
             },
diff --git a/frontend/src/components/LanguageSwitch.vue b/frontend/src/components/LanguageSwitch.vue
index e6f9c86c3..f0528a935 100644
--- a/frontend/src/components/LanguageSwitch.vue
+++ b/frontend/src/components/LanguageSwitch.vue
@@ -32,13 +32,13 @@ export default {
       localeChanged(locale)
     },
     async saveLocale(locale) {
+      // if (this.$i18n.locale === locale) return
       this.setLocale(locale)
-      if (this.$store.state.sessionId && this.$store.state.email) {
+      if (this.$store.state.email) {
         this.$apollo
           .query({
             query: updateUserInfos,
             variables: {
-              sessionId: this.$store.state.sessionId,
               email: this.$store.state.email,
               locale: locale,
             },
diff --git a/frontend/src/graphql/queries.js b/frontend/src/graphql/queries.js
index e7cfa2182..eacdc7618 100644
--- a/frontend/src/graphql/queries.js
+++ b/frontend/src/graphql/queries.js
@@ -2,23 +2,13 @@ import gql from 'graphql-tag'
 
 export const login = gql`
   query($email: String!, $password: String!) {
-    login(email: $email, password: $password) {
-      sessionId
-      user {
-        email
-        firstName
-        lastName
-        language
-        username
-        description
-      }
-    }
+    login(email: $email, password: $password)
   }
 `
 
 export const logout = gql`
-  query($sessionId: Float!) {
-    logout(sessionId: $sessionId)
+  query {
+    logout
   }
 `
 
@@ -39,7 +29,6 @@ export const loginViaEmailVerificationCode = gql`
 
 export const updateUserInfos = gql`
   query(
-    $sessionId: Float!
     $email: String!
     $firstName: String
     $lastName: String
@@ -50,7 +39,6 @@ export const updateUserInfos = gql`
     $locale: String
   ) {
     updateUserInfos(
-      sessionId: $sessionId
       email: $email
       firstName: $firstName
       lastName: $lastName
@@ -66,8 +54,8 @@ export const updateUserInfos = gql`
 `
 
 export const transactionsQuery = gql`
-  query($sessionId: Float!, $firstPage: Int = 1, $items: Int = 25, $order: String = "DESC") {
-    transactionList(sessionId: $sessionId, firstPage: $firstPage, items: $items, order: $order) {
+  query($firstPage: Int = 1, $items: Int = 25, $order: String = "DESC") {
+    transactionList(firstPage: $firstPage, items: $items, order: $order) {
       gdtSum
       count
       balance
@@ -115,8 +103,8 @@ export const resgisterUserQuery = gql`
 `
 
 export const sendCoins = gql`
-  query($sessionId: Float!, $email: String!, $amount: Float!, $memo: String!) {
-    sendCoins(sessionId: $sessionId, email: $email, amount: $amount, memo: $memo)
+  query($email: String!, $amount: Float!, $memo: String!) {
+    sendCoins(email: $email, amount: $amount, memo: $memo)
   }
 `
 
@@ -137,10 +125,11 @@ export const checkUsername = gql`
 `
 
 export const listGDTEntriesQuery = gql`
-  query($currentPage: Int!, $pageSize: Int!, $sessionId: Float!) {
-    listGDTEntries(currentPage: $currentPage, pageSize: $pageSize, sessionId: $sessionId) {
+  query($currentPage: Int!, $pageSize: Int!) {
+    listGDTEntries(currentPage: $currentPage, pageSize: $pageSize) {
       count
       gdtEntries {
+        id
         amount
         date
         comment
diff --git a/frontend/src/locales/de.json b/frontend/src/locales/de.json
index 5db4bc337..ae1822396 100644
--- a/frontend/src/locales/de.json
+++ b/frontend/src/locales/de.json
@@ -18,6 +18,7 @@
     "de": "Deutsch",
     "en": "English"
   },
+  "select_language": "Bitte wähle eine Sprache für die App und Newsletter",
   "decay": {
     "decay": "Vergänglichkeit",
     "decay_since_last_transaction":"Vergänglichkeit seit der letzten Transaktion",
diff --git a/frontend/src/locales/en.json b/frontend/src/locales/en.json
index 323f96b4d..4bd04116d 100644
--- a/frontend/src/locales/en.json
+++ b/frontend/src/locales/en.json
@@ -18,6 +18,7 @@
     "de": "Deutsch",
     "en": "English"
   },
+  "select_language": "Please choose a language for the app and newsletter",
   "decay": {
     "decay": "Decay",
     "decay_since_last_transaction":"Decay since the last transaction",
diff --git a/frontend/src/main.js b/frontend/src/main.js
index 31ccd8de7..823df516c 100755
--- a/frontend/src/main.js
+++ b/frontend/src/main.js
@@ -3,7 +3,7 @@ import DashboardPlugin from './plugins/dashboard-plugin'
 import App from './App.vue'
 import i18n from './i18n.js'
 import { loadAllRules } from './validation-rules'
-import ApolloClient from 'apollo-boost'
+import { ApolloClient, ApolloLink, InMemoryCache, HttpLink } from 'apollo-boost'
 import VueApollo from 'vue-apollo'
 import CONFIG from './config'
 
@@ -11,7 +11,21 @@ import { store } from './store/store'
 
 import router from './routes/router'
 
+const httpLink = new HttpLink({ uri: CONFIG.GRAPHQL_URI })
+
+const authLink = new ApolloLink((operation, forward) => {
+  const token = store.state.token
+  operation.setContext({
+    headers: {
+      Authorization: token && token.length > 0 ? `Bearer ${token}` : '',
+    },
+  })
+  return forward(operation)
+})
+
 const apolloClient = new ApolloClient({
+  link: authLink.concat(httpLink),
+  cache: new InMemoryCache(),
   uri: CONFIG.GRAPHQL_URI,
 })
 
@@ -26,7 +40,7 @@ Vue.config.productionTip = false
 loadAllRules(i18n)
 
 router.beforeEach((to, from, next) => {
-  if (to.meta.requiresAuth && !store.state.sessionId) {
+  if (to.meta.requiresAuth && !store.state.token) {
     next({ path: '/login' })
   } else {
     next()
diff --git a/frontend/src/store/store.js b/frontend/src/store/store.js
index 03be5e75c..77c7096ad 100644
--- a/frontend/src/store/store.js
+++ b/frontend/src/store/store.js
@@ -1,6 +1,8 @@
 import Vue from 'vue'
 import Vuex from 'vuex'
 import createPersistedState from 'vuex-persistedstate'
+import VueJwtDecode from 'vue-jwt-decode'
+
 Vue.use(Vuex)
 
 export const mutations = {
@@ -10,9 +12,6 @@ export const mutations = {
   email: (state, email) => {
     state.email = email
   },
-  sessionId: (state, sessionId) => {
-    state.sessionId = sessionId
-  },
   username: (state, username) => {
     state.username = username
   },
@@ -25,43 +24,47 @@ export const mutations = {
   description: (state, description) => {
     state.description = description
   },
+  token: (state, token) => {
+    state.token = token
+  },
 }
 
 export const actions = {
-  login: ({ dispatch, commit }, data) => {
-    commit('sessionId', data.sessionId)
-    commit('email', data.user.email)
-    commit('language', data.user.language)
-    commit('username', data.user.username)
-    commit('firstName', data.user.firstName)
-    commit('lastName', data.user.lastName)
-    commit('description', data.user.description)
+  login: ({ dispatch, commit }, token) => {
+    const decoded = VueJwtDecode.decode(token)
+    commit('token', token)
+    commit('email', decoded.email)
+    commit('language', decoded.language)
+    commit('username', decoded.username)
+    commit('firstName', decoded.firstName)
+    commit('lastName', decoded.lastName)
+    commit('description', decoded.description)
   },
   logout: ({ commit, state }) => {
-    commit('sessionId', null)
+    commit('token', null)
     commit('email', null)
     commit('username', '')
     commit('firstName', '')
     commit('lastName', '')
     commit('description', '')
-    sessionStorage.clear()
+    localStorage.clear()
   },
 }
 
 export const store = new Vuex.Store({
   plugins: [
     createPersistedState({
-      storage: window.sessionStorage,
+      storage: window.localStorage,
     }),
   ],
   state: {
-    sessionId: null,
     email: '',
     language: null,
     firstName: '',
     lastName: '',
     username: '',
     description: '',
+    token: null,
   },
   getters: {},
   // Syncronous mutation of the state
diff --git a/frontend/src/store/store.test.js b/frontend/src/store/store.test.js
index a67dff5ce..99a37451e 100644
--- a/frontend/src/store/store.test.js
+++ b/frontend/src/store/store.test.js
@@ -1,6 +1,17 @@
 import { mutations, actions } from './store'
+import VueJwtDecode from 'vue-jwt-decode'
 
-const { language, email, sessionId, username, firstName, lastName, description } = mutations
+jest.mock('vue-jwt-decode')
+VueJwtDecode.decode.mockReturnValue({
+  email: 'user@example.org',
+  language: 'de',
+  username: 'peter',
+  firstName: 'Peter',
+  lastName: 'Lustig',
+  description: 'Nickelbrille',
+})
+
+const { language, email, token, username, firstName, lastName, description } = mutations
 const { login, logout } = actions
 
 describe('Vuex store', () => {
@@ -21,11 +32,11 @@ describe('Vuex store', () => {
       })
     })
 
-    describe('sessionId', () => {
-      it('sets the state of sessionId', () => {
-        const state = { sessionId: null }
-        sessionId(state, '1234')
-        expect(state.sessionId).toEqual('1234')
+    describe('token', () => {
+      it('sets the state of token', () => {
+        const state = { token: null }
+        token(state, '1234')
+        expect(state.token).toEqual('1234')
       })
     })
 
@@ -66,41 +77,31 @@ describe('Vuex store', () => {
     describe('login', () => {
       const commit = jest.fn()
       const state = {}
-      const commitedData = {
-        sessionId: 1234,
-        user: {
-          email: 'someone@there.is',
-          language: 'en',
-          username: 'user',
-          firstName: 'Peter',
-          lastName: 'Lustig',
-          description: 'Nickelbrille',
-        },
-      }
+      const commitedData = 'token'
 
       it('calls seven commits', () => {
         login({ commit, state }, commitedData)
         expect(commit).toHaveBeenCalledTimes(7)
       })
 
-      it('commits sessionId', () => {
+      it('commits token', () => {
         login({ commit, state }, commitedData)
-        expect(commit).toHaveBeenNthCalledWith(1, 'sessionId', 1234)
+        expect(commit).toHaveBeenNthCalledWith(1, 'token', 'token')
       })
 
       it('commits email', () => {
         login({ commit, state }, commitedData)
-        expect(commit).toHaveBeenNthCalledWith(2, 'email', 'someone@there.is')
+        expect(commit).toHaveBeenNthCalledWith(2, 'email', 'user@example.org')
       })
 
       it('commits language', () => {
         login({ commit, state }, commitedData)
-        expect(commit).toHaveBeenNthCalledWith(3, 'language', 'en')
+        expect(commit).toHaveBeenNthCalledWith(3, 'language', 'de')
       })
 
       it('commits username', () => {
         login({ commit, state }, commitedData)
-        expect(commit).toHaveBeenNthCalledWith(4, 'username', 'user')
+        expect(commit).toHaveBeenNthCalledWith(4, 'username', 'peter')
       })
 
       it('commits firstName', () => {
@@ -128,9 +129,9 @@ describe('Vuex store', () => {
         expect(commit).toHaveBeenCalledTimes(6)
       })
 
-      it('commits sessionId', () => {
+      it('commits token', () => {
         logout({ commit, state })
-        expect(commit).toHaveBeenNthCalledWith(1, 'sessionId', null)
+        expect(commit).toHaveBeenNthCalledWith(1, 'token', null)
       })
 
       it('commits email', () => {
@@ -159,7 +160,7 @@ describe('Vuex store', () => {
       })
 
       // how to get this working?
-      it.skip('calls sessionStorage.clear()', () => {
+      it.skip('calls localStorage.clear()', () => {
         const clearStorageMock = jest.fn()
         global.sessionStorage = jest.fn(() => {
           return {
diff --git a/frontend/src/views/Layout/DashboardLayout_gdd.spec.js b/frontend/src/views/Layout/DashboardLayout_gdd.spec.js
index f0f08f6a2..614ddf9c4 100644
--- a/frontend/src/views/Layout/DashboardLayout_gdd.spec.js
+++ b/frontend/src/views/Layout/DashboardLayout_gdd.spec.js
@@ -41,7 +41,6 @@ describe('DashboardLayoutGdd', () => {
     },
     $store: {
       state: {
-        sessionId: 1,
         email: 'user@example.org',
       },
       dispatch: storeDispatchMock,
@@ -128,16 +127,17 @@ describe('DashboardLayoutGdd', () => {
 
       describe('logout', () => {
         beforeEach(async () => {
+          await apolloMock.mockResolvedValue({
+            data: {
+              logout: 'success',
+            },
+          })
           await wrapper.findComponent({ name: 'sidebar' }).vm.$emit('logout')
           await flushPromises()
         })
 
         it('calls the API', async () => {
-          expect(apolloMock).toBeCalledWith(
-            expect.objectContaining({
-              variables: { sessionId: 1 },
-            }),
-          )
+          await expect(apolloMock).toBeCalled()
         })
 
         it('dispatches logout to store', () => {
@@ -196,7 +196,6 @@ describe('DashboardLayoutGdd', () => {
           expect(apolloMock).toBeCalledWith(
             expect.objectContaining({
               variables: {
-                sessionId: 1,
                 firstPage: 2,
                 items: 5,
               },
diff --git a/frontend/src/views/Layout/DashboardLayout_gdd.vue b/frontend/src/views/Layout/DashboardLayout_gdd.vue
index 4081f4ceb..35e7bb8af 100755
--- a/frontend/src/views/Layout/DashboardLayout_gdd.vue
+++ b/frontend/src/views/Layout/DashboardLayout_gdd.vue
@@ -92,7 +92,6 @@ export default {
       this.$apollo
         .query({
           query: logout,
-          variables: { sessionId: this.$store.state.sessionId },
         })
         .then(() => {
           this.$sidebar.displaySidebar(false)
@@ -111,7 +110,6 @@ export default {
         .query({
           query: transactionsQuery,
           variables: {
-            sessionId: this.$store.state.sessionId,
             firstPage: pagination.firstPage,
             items: pagination.items,
           },
diff --git a/frontend/src/views/Pages/AccountOverview.spec.js b/frontend/src/views/Pages/AccountOverview.spec.js
index b890f1471..df964ed2c 100644
--- a/frontend/src/views/Pages/AccountOverview.spec.js
+++ b/frontend/src/views/Pages/AccountOverview.spec.js
@@ -16,12 +16,12 @@ describe('AccountOverview', () => {
 
   const mocks = {
     $t: jest.fn((t) => t),
+    $n: jest.fn((n) => String(n)),
     $store: {
       state: {
-        sessionId: 1,
+        email: 'sender@example.org',
       },
     },
-    $n: jest.fn((n) => String(n)),
     $apollo: {
       query: sendMock,
     },
@@ -93,7 +93,6 @@ describe('AccountOverview', () => {
           expect(sendMock).toBeCalledWith(
             expect.objectContaining({
               variables: {
-                sessionId: 1,
                 email: 'user@example.org',
                 amount: 23.45,
                 memo: 'Make the best of it!',
diff --git a/frontend/src/views/Pages/AccountOverview.vue b/frontend/src/views/Pages/AccountOverview.vue
index b89955a6a..8e5362d8c 100644
--- a/frontend/src/views/Pages/AccountOverview.vue
+++ b/frontend/src/views/Pages/AccountOverview.vue
@@ -107,10 +107,7 @@ export default {
       this.$apollo
         .query({
           query: sendCoins,
-          variables: {
-            sessionId: this.$store.state.sessionId,
-            ...this.transactionData,
-          },
+          variables: this.transactionData,
         })
         .then(() => {
           this.error = false
diff --git a/frontend/src/views/Pages/AccountOverview/GddSend.spec.js b/frontend/src/views/Pages/AccountOverview/GddSend.spec.js
index c7005ddf5..15beac511 100644
--- a/frontend/src/views/Pages/AccountOverview/GddSend.spec.js
+++ b/frontend/src/views/Pages/AccountOverview/GddSend.spec.js
@@ -8,11 +8,6 @@ describe('GddSend', () => {
 
   const mocks = {
     $t: jest.fn((t) => t),
-    $store: {
-      state: {
-        sessionId: 1234,
-      },
-    },
     $i18n: {
       locale: jest.fn(() => 'en'),
     },
diff --git a/frontend/src/views/Pages/AccountOverview/GdtTransactionList.spec.js b/frontend/src/views/Pages/AccountOverview/GdtTransactionList.spec.js
index 5ad12be97..a3c737d10 100644
--- a/frontend/src/views/Pages/AccountOverview/GdtTransactionList.spec.js
+++ b/frontend/src/views/Pages/AccountOverview/GdtTransactionList.spec.js
@@ -57,11 +57,6 @@ describe('GdtTransactionList', () => {
     $t: jest.fn((t) => t),
     $n: jest.fn((n) => n),
     $d: jest.fn((d) => d),
-    $store: {
-      state: {
-        sessionId: 1,
-      },
-    },
     $toasted: {
       error: toastErrorMock,
     },
@@ -89,7 +84,6 @@ describe('GdtTransactionList', () => {
         expect(apolloMock).toBeCalledWith(
           expect.objectContaining({
             variables: {
-              sessionId: 1,
               currentPage: 1,
               pageSize: 25,
             },
diff --git a/frontend/src/views/Pages/AccountOverview/GdtTransactionList.vue b/frontend/src/views/Pages/AccountOverview/GdtTransactionList.vue
index 8193717cf..3bdc9f42c 100644
--- a/frontend/src/views/Pages/AccountOverview/GdtTransactionList.vue
+++ b/frontend/src/views/Pages/AccountOverview/GdtTransactionList.vue
@@ -163,10 +163,19 @@
 import { listGDTEntriesQuery } from '../../../graphql/queries'
 import PaginationButtons from '../../../components/PaginationButtons'
 
-const iconsByType = {
-  1: { icon: 'heart', classes: 'gradido-global-color-accent' },
-  4: { icon: 'person-check', classes: 'gradido-global-color-accent' },
-  7: { icon: 'gift', classes: 'gradido-global-color-accent' },
+function iconByType(typeId) {
+  switch (typeId) {
+    case 1:
+    case 2:
+    case 3:
+    case 5:
+    case 6:
+      return { icon: 'heart', classes: 'gradido-global-color-accent' }
+    case 4:
+      return { icon: 'person-check', classes: 'gradido-global-color-accent' }
+    case 7:
+      return { icon: 'gift', classes: 'gradido-global-color-accent' }
+  }
 }
 
 export default {
@@ -199,7 +208,6 @@ export default {
         .query({
           query: listGDTEntriesQuery,
           variables: {
-            sessionId: this.$store.state.sessionId,
             currentPage: this.currentPage,
             pageSize: this.pageSize,
           },
@@ -216,7 +224,7 @@ export default {
         })
     },
     getIcon(givenType) {
-      const type = iconsByType[givenType]
+      const type = iconByType(givenType)
       if (type)
         return {
           icon: type.icon,
diff --git a/frontend/src/views/Pages/Login.spec.js b/frontend/src/views/Pages/Login.spec.js
index 7cbe5f003..20eead7a3 100644
--- a/frontend/src/views/Pages/Login.spec.js
+++ b/frontend/src/views/Pages/Login.spec.js
@@ -6,12 +6,7 @@ const localVue = global.localVue
 
 const loginQueryMock = jest.fn().mockResolvedValue({
   data: {
-    login: {
-      sessionId: 1,
-      user: {
-        name: 'Peter Lustig',
-      },
-    },
+    login: 'token',
   },
 })
 
@@ -159,10 +154,7 @@ describe('Login', () => {
 
         describe('login success', () => {
           it('dispatches server response to store', () => {
-            expect(mockStoreDispach).toBeCalledWith('login', {
-              sessionId: 1,
-              user: { name: 'Peter Lustig' },
-            })
+            expect(mockStoreDispach).toBeCalledWith('login', 'token')
           })
 
           it('redirects to overview page', () => {
diff --git a/frontend/src/views/Pages/Register.spec.js b/frontend/src/views/Pages/Register.spec.js
index 83ff177d3..1a9549d41 100644
--- a/frontend/src/views/Pages/Register.spec.js
+++ b/frontend/src/views/Pages/Register.spec.js
@@ -85,6 +85,13 @@ describe('Register', () => {
       it('has password repeat input fields', () => {
         expect(wrapper.find('input[name="form.passwordRepeat"]').exists()).toBeTruthy()
       })
+      it('has Language selected field', () => {
+        expect(wrapper.find('#selectedLanguage').exists()).toBeTruthy()
+      })
+      it('selected Language value de', async () => {
+        wrapper.find('#selectedLanguage').findAll('option').at(1).setSelected()
+        expect(wrapper.find('#selectedLanguage').element.value).toBe('de')
+      })
 
       it('has 1 checkbox input fields', () => {
         expect(wrapper.find('#registerCheckbox').exists()).toBeTruthy()
@@ -126,9 +133,16 @@ describe('Register', () => {
         wrapper.find('#Email-input-field').setValue('max.mustermann@gradido.net')
         wrapper.find('input[name="form.password"]').setValue('Aa123456')
         wrapper.find('input[name="form.passwordRepeat"]').setValue('Aa123456')
+        wrapper.find('#selectedLanguage').findAll('option').at(1).setSelected()
         wrapper.find('input[name="site.signup.agree"]').setChecked(true)
       })
 
+      it('reset selected value language', async () => {
+        await wrapper.find('button.ml-2').trigger('click')
+        await flushPromises()
+        expect(wrapper.find('#selectedLanguage').element.value).toBe('')
+      })
+
       it('resets the firstName field after clicking the reset button', async () => {
         await wrapper.find('button.ml-2').trigger('click')
         await flushPromises()
@@ -173,6 +187,7 @@ describe('Register', () => {
         wrapper.find('#Email-input-field').setValue('max.mustermann@gradido.net')
         wrapper.find('input[name="form.password"]').setValue('Aa123456')
         wrapper.find('input[name="form.passwordRepeat"]').setValue('Aa123456')
+        wrapper.find('#selectedLanguage').findAll('option').at(1).setSelected()
       })
 
       describe('server sends back error', () => {
diff --git a/frontend/src/views/Pages/Register.vue b/frontend/src/views/Pages/Register.vue
index 2680c5ecf..f8e7eefd0 100755
--- a/frontend/src/views/Pages/Register.vue
+++ b/frontend/src/views/Pages/Register.vue
@@ -84,6 +84,18 @@
                     :register="register"
                   ></input-password-confirmation>
 
+                  <b-row>
+                    <b-col cols="12">
+                      {{ $t('language') }}
+                      <b-form-select
+                        id="selectedLanguage"
+                        v-model="selected"
+                        :options="options"
+                        class="mb-3"
+                      ></b-form-select>
+                    </b-col>
+                  </b-row>
+
                   <b-row class="my-4">
                     <b-col cols="12">
                       <b-form-checkbox
@@ -109,7 +121,10 @@
                     </span>
                   </b-alert>
 
-                  <div class="text-center" v-if="namesFilled && emailFilled && form.agree">
+                  <div
+                    class="text-center"
+                    v-if="namesFilled && emailFilled && form.agree && languageFilled"
+                  >
                     <div class="text-center">
                       <b-button class="ml-2" @click="resetForm()">{{ $t('form.reset') }}</b-button>
                       <b-button type="submit" variant="primary">{{ $t('signup') }}</b-button>
@@ -147,6 +162,12 @@ export default {
           passwordRepeat: '',
         },
       },
+      selected: null,
+      options: [
+        { value: null, text: this.$t('select_language') },
+        { value: 'de', text: this.$t('languages.de') },
+        { value: 'en', text: this.$t('languages.en') },
+      ],
       submitted: false,
       showError: false,
       messageError: '',
@@ -168,8 +189,7 @@ export default {
         },
         agree: false,
       }
-      this.form.password.password = ''
-      this.form.password.passwordRepeat = ''
+      this.selected = null
       this.$nextTick(() => {
         this.$refs.observer.reset()
       })
@@ -183,7 +203,7 @@ export default {
             firstName: this.form.firstname,
             lastName: this.form.lastname,
             password: this.form.password.password,
-            language: this.$store.state.language,
+            language: this.selected,
           },
         })
         .then(() => {
@@ -192,6 +212,7 @@ export default {
           this.form.lastname = ''
           this.form.password.password = ''
           this.form.password.passwordRepeat = ''
+          this.selected = null
           this.$router.push('/thx/register')
         })
         .catch((error) => {
@@ -207,6 +228,7 @@ export default {
       this.form.lastname = ''
       this.form.password.password = ''
       this.form.password.passwordRepeat = ''
+      this.selected = null
     },
   },
   computed: {
@@ -221,6 +243,9 @@ export default {
     emailFilled() {
       return this.form.email !== ''
     },
+    languageFilled() {
+      return this.selected !== null
+    },
   },
 }
 </script>
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.spec.js b/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.spec.js
index 847185741..b3e014e57 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.spec.js
+++ b/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.spec.js
@@ -17,7 +17,6 @@ describe('UserCard_FormUserData', () => {
     $t: jest.fn((t) => t),
     $store: {
       state: {
-        sessionId: 1,
         email: 'user@example.org',
         firstName: 'Peter',
         lastName: 'Lustig',
@@ -118,7 +117,6 @@ describe('UserCard_FormUserData', () => {
           expect(mockAPIcall).toBeCalledWith(
             expect.objectContaining({
               variables: {
-                sessionId: 1,
                 email: 'user@example.org',
                 firstName: 'Petra',
                 lastName: 'Lustiger',
@@ -167,7 +165,6 @@ describe('UserCard_FormUserData', () => {
           expect(mockAPIcall).toBeCalledWith(
             expect.objectContaining({
               variables: {
-                sessionId: 1,
                 email: 'user@example.org',
                 firstName: 'Petra',
                 lastName: 'Lustiger',
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.vue b/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.vue
index 369d30074..3726b5298 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.vue
+++ b/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.vue
@@ -85,7 +85,6 @@ export default {
   data() {
     return {
       showUserData: true,
-      sessionId: this.$store.state.sessionId,
       form: {
         firstName: this.$store.state.firstName,
         lastName: this.$store.state.lastName,
@@ -118,7 +117,6 @@ export default {
         .query({
           query: updateUserInfos,
           variables: {
-            sessionId: this.$store.state.sessionId,
             email: this.$store.state.email,
             firstName: this.form.firstName,
             lastName: this.form.lastName,
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_FormUserMail.spec.js b/frontend/src/views/Pages/UserProfile/UserCard_FormUserMail.spec.js
index 93477bdfa..06f26877a 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_FormUserMail.spec.js
+++ b/frontend/src/views/Pages/UserProfile/UserCard_FormUserMail.spec.js
@@ -14,7 +14,6 @@ describe('UserCard_FormUserMail', () => {
     $t: jest.fn((t) => t),
     $store: {
       state: {
-        sessionId: 1,
         email: 'user@example.org',
         firstName: 'Peter',
         lastName: 'Lustig',
@@ -76,7 +75,6 @@ describe('UserCard_FormUserMail', () => {
           expect(mockAPIcall).toHaveBeenCalledWith(
             expect.objectContaining({
               variables: {
-                sessionId: 1,
                 email: 'user@example.org',
                 newEmail: 'test@example.org',
               },
@@ -106,7 +104,6 @@ describe('UserCard_FormUserMail', () => {
           expect(mockAPIcall).toHaveBeenCalledWith(
             expect.objectContaining({
               variables: {
-                sessionId: 1,
                 email: 'user@example.org',
                 newEmail: 'test@example.org',
               },
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_FormUserMail.vue b/frontend/src/views/Pages/UserProfile/UserCard_FormUserMail.vue
index b5c4f30bb..ed88425c7 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_FormUserMail.vue
+++ b/frontend/src/views/Pages/UserProfile/UserCard_FormUserMail.vue
@@ -48,7 +48,6 @@ export default {
         .query({
           query: updateUserInfos,
           variables: {
-            sessionId: this.$store.state.sessionId,
             email: this.$store.state.email,
             newEmail: this.newEmail,
           },
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.spec.js b/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.spec.js
index c44f7d300..fa4aceb0c 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.spec.js
+++ b/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.spec.js
@@ -17,7 +17,6 @@ describe('UserCard_FormUserPasswort', () => {
     $t: jest.fn((t) => t),
     $store: {
       state: {
-        sessionId: 1,
         email: 'user@example.org',
       },
     },
@@ -175,7 +174,6 @@ describe('UserCard_FormUserPasswort', () => {
             expect(changePasswordProfileMock).toHaveBeenCalledWith(
               expect.objectContaining({
                 variables: {
-                  sessionId: 1,
                   email: 'user@example.org',
                   password: '1234',
                   passwordNew: 'Aa123456',
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.vue b/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.vue
index a9be983c1..4678defaf 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.vue
+++ b/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.vue
@@ -81,7 +81,6 @@ export default {
         .query({
           query: updateUserInfos,
           variables: {
-            sessionId: this.$store.state.sessionId,
             email: this.$store.state.email,
             password: this.form.password,
             passwordNew: this.form.newPassword.password,
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.spec.js b/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.spec.js
index b6ab05902..8a69ee7eb 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.spec.js
+++ b/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.spec.js
@@ -25,7 +25,6 @@ describe('UserCard_FormUsername', () => {
     $t: jest.fn((t) => t),
     $store: {
       state: {
-        sessionId: 1,
         email: 'user@example.org',
         username: '',
       },
@@ -111,7 +110,6 @@ describe('UserCard_FormUsername', () => {
               expect.objectContaining({
                 variables: {
                   email: 'user@example.org',
-                  sessionId: 1,
                   username: 'username',
                 },
               }),
@@ -151,7 +149,6 @@ describe('UserCard_FormUsername', () => {
               expect.objectContaining({
                 variables: {
                   email: 'user@example.org',
-                  sessionId: 1,
                   username: 'username',
                 },
               }),
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.vue b/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.vue
index 1c269ba53..f6587b968 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.vue
+++ b/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.vue
@@ -90,7 +90,6 @@ export default {
         .query({
           query: updateUserInfos,
           variables: {
-            sessionId: this.$store.state.sessionId,
             email: this.$store.state.email,
             username: this.form.username,
           },
diff --git a/frontend/src/views/Pages/UserProfileTransactionList.spec.js b/frontend/src/views/Pages/UserProfileTransactionList.spec.js
index 484dd10f1..8e4235fbe 100644
--- a/frontend/src/views/Pages/UserProfileTransactionList.spec.js
+++ b/frontend/src/views/Pages/UserProfileTransactionList.spec.js
@@ -13,11 +13,6 @@ describe('UserProfileTransactionList', () => {
     $i18n: {
       locale: jest.fn(() => 'en'),
     },
-    $store: {
-      state: {
-        sessionId: 1,
-      },
-    },
   }
 
   const stubs = {
diff --git a/frontend/yarn.lock b/frontend/yarn.lock
index eff78ada1..c910ea9de 100644
--- a/frontend/yarn.lock
+++ b/frontend/yarn.lock
@@ -13576,6 +13576,13 @@ vue-jest@^3.0.5, vue-jest@^3.0.7:
     tsconfig "^7.0.0"
     vue-template-es2015-compiler "^1.6.0"
 
+vue-jwt-decode@^0.1.0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/vue-jwt-decode/-/vue-jwt-decode-0.1.0.tgz#f9caf7b9030d5459cc567b1c3117d9d1f291458f"
+  integrity sha512-4iP0NzYHkAF7G13tYPc/nudk4oNpB8GCVZupc7lekxXok1XKEgefNaGTpDT14g7RKe5H9GaMphPduDj4UVfZwQ==
+  dependencies:
+    vue "^2.3.3"
+
 vue-loader@^15.7.0:
   version "15.9.6"
   resolved "https://registry.yarnpkg.com/vue-loader/-/vue-loader-15.9.6.tgz#f4bb9ae20c3a8370af3ecf09b8126d38ffdb6b8b"
@@ -13655,6 +13662,11 @@ vue@^2.2.6, vue@^2.5.17, vue@^2.6.11:
   resolved "https://registry.yarnpkg.com/vue/-/vue-2.6.12.tgz#f5ebd4fa6bd2869403e29a896aed4904456c9123"
   integrity sha512-uhmLFETqPPNyuLLbsKz6ioJ4q7AZHzD8ZVFNATNyICSZouqP2Sz0rotWQC8UNBF6VGSCs5abnKJoStA6JbCbfg==
 
+vue@^2.3.3:
+  version "2.6.14"
+  resolved "https://registry.yarnpkg.com/vue/-/vue-2.6.14.tgz#e51aa5250250d569a3fbad3a8a5a687d6036e235"
+  integrity sha512-x2284lgYvjOMj3Za7kqzRcUSxBboHqtgRE2zlos1qWaOye5yUmHn42LB1250NJBLRwEcdrB0JRwyPTEPhfQjiQ==
+
 vuex-persistedstate@^4.0.0-beta.3:
   version "4.0.0-beta.3"
   resolved "https://registry.yarnpkg.com/vuex-persistedstate/-/vuex-persistedstate-4.0.0-beta.3.tgz#89dd712de72d28e85cc95467d066002c1405f277"