diff --git a/backend/src/federation/client/1_1/FederationClient.ts b/backend/src/federation/client/1_1/FederationClient.ts
index 1c0ec4996..a8d7e1dff 100644
--- a/backend/src/federation/client/1_1/FederationClient.ts
+++ b/backend/src/federation/client/1_1/FederationClient.ts
@@ -18,9 +18,13 @@ export async function requestGetPublicKey(dbCom: DbCommunity): Promise<string |
       }
     }
   `
+  const variables = {}
 
   try {
-    const { data, errors, extensions, headers, status } = await graphQLClient.rawRequest(query)
+    const { data, errors, extensions, headers, status } = await graphQLClient.rawRequest(
+      query,
+      variables,
+    )
     logger.debug(`Response-Data:`, data, errors, extensions, headers, status)
     if (data) {
       logger.debug(`Response-PublicKey:`, data.getPublicKey.publicKey)
diff --git a/backend/src/federation/client/GraphQLGetClient.ts b/backend/src/federation/client/GraphQLGetClient.ts
index 7e2d89b6c..8086a95fa 100644
--- a/backend/src/federation/client/GraphQLGetClient.ts
+++ b/backend/src/federation/client/GraphQLGetClient.ts
@@ -1,8 +1,14 @@
 import { GraphQLClient } from 'graphql-request'
 import { PatchedRequestInit } from 'graphql-request/dist/types'
 
+type ClientInstance = {
+  url: string
+  // eslint-disable-next-line no-use-before-define
+  client: GraphQLGetClient
+}
+
 export class GraphQLGetClient extends GraphQLClient {
-  private static instance: GraphQLGetClient
+  private static instanceArray: ClientInstance[] = []
 
   /**
    * The Singleton's constructor should always be private to prevent direct
@@ -20,16 +26,19 @@ export class GraphQLGetClient extends GraphQLClient {
    * just one instance of each subclass around.
    */
   public static getInstance(url: string): GraphQLGetClient {
-    if (!GraphQLGetClient.instance) {
-      GraphQLGetClient.instance = new GraphQLGetClient(url, {
-        method: 'GET',
-        jsonSerializer: {
-          parse: JSON.parse,
-          stringify: JSON.stringify,
-        },
-      })
-    }
-
-    return GraphQLGetClient.instance
+    GraphQLGetClient.instanceArray.forEach(function (instance) {
+      if (instance.url === url) {
+        return instance.client
+      }
+    })
+    const client = new GraphQLGetClient(url, {
+      method: 'GET',
+      jsonSerializer: {
+        parse: JSON.parse,
+        stringify: JSON.stringify,
+      },
+    })
+    GraphQLGetClient.instanceArray.push({ url, client } as ClientInstance)
+    return client
   }
 }
diff --git a/backend/src/federation/validateCommunities.ts b/backend/src/federation/validateCommunities.ts
index f5a0c50ac..c06b2fd72 100644
--- a/backend/src/federation/validateCommunities.ts
+++ b/backend/src/federation/validateCommunities.ts
@@ -40,17 +40,16 @@ export async function validateCommunities(): Promise<void> {
         logger.info(
           `Federation: received publicKey=${pubKey} from endpoint=${dbCom.endPoint}/${dbCom.apiVersion}`,
         )
-        if (pubKey && pubKey === dbCom.publicKey.toString('hex')) {
+        if (pubKey && pubKey === dbCom.publicKey.toString()) {
           logger.info(`Federation: matching publicKey:  ${pubKey}`)
           DbCommunity.update({ id: dbCom.id }, { verifiedAt: new Date() })
           logger.debug(`Federation: updated dbCom:  ${JSON.stringify(dbCom)}`)
+        } else {
+          logger.warn(
+            `Federation: received not matching publicKey -> received: ${pubKey}, expected: ${dbCom.publicKey} `,
+          )
+          // DbCommunity.delete({ id: dbCom.id })
         }
-        /*
-        else {
-          logger.warn(`Federation: received unknown publicKey -> delete dbCom with id=${dbCom.id} `)
-          DbCommunity.delete({ id: dbCom.id })
-        }
-        */
       } catch (err) {
         if (!isLogError(err)) {
           logger.error(`Error:`, err)
diff --git a/federation/src/graphql/api/1_0/model/GetPublicKeyResult.ts b/federation/src/graphql/api/1_0/model/GetPublicKeyResult.ts
new file mode 100644
index 000000000..1582ad892
--- /dev/null
+++ b/federation/src/graphql/api/1_0/model/GetPublicKeyResult.ts
@@ -0,0 +1,11 @@
+import { Field, ObjectType } from 'type-graphql'
+
+@ObjectType()
+export class GetPublicKeyResult {
+  constructor(pubKey: string) {
+    this.publicKey = pubKey
+  }
+
+  @Field(() => String)
+  publicKey: string
+}
diff --git a/federation/src/graphql/api/1_0/resolver/PublicKeyResolver.ts b/federation/src/graphql/api/1_0/resolver/PublicKeyResolver.ts
new file mode 100644
index 000000000..53f0d0bd4
--- /dev/null
+++ b/federation/src/graphql/api/1_0/resolver/PublicKeyResolver.ts
@@ -0,0 +1,18 @@
+import { Field, ObjectType, Query, Resolver } from 'type-graphql'
+import { federationLogger as logger } from '@/server/logger'
+import { Community as DbCommunity } from '@entity/Community'
+import { GetPublicKeyResult } from '../model/GetPublicKeyResult'
+
+@Resolver()
+export class PublicKeyResolver {
+  @Query(() => GetPublicKeyResult)
+  async getPublicKey(): Promise<GetPublicKeyResult> {
+    logger.info(`getPublicKey()...`)
+    const homeCom = await DbCommunity.findOneOrFail({
+      foreign: false,
+      apiVersion: '1_0',
+    })
+    logger.info(`getPublicKey()... with publicKey=${homeCom.publicKey}`)
+    return new GetPublicKeyResult(homeCom.publicKey.toString())
+  }
+}