diff --git a/login_server/src/cpp/controller/Group.cpp b/login_server/src/cpp/controller/Group.cpp
index d033d37f1..cbd023a3d 100644
--- a/login_server/src/cpp/controller/Group.cpp
+++ b/login_server/src/cpp/controller/Group.cpp
@@ -77,6 +77,23 @@ namespace controller {
 		}
 		return resultVector;
 	}
+
+	JsonRequest Group::createJsonRequest()
+	{
+		int port = 0;
+		port = ServerConfig::g_serverPort;
+		if (!port) {
+			if (ServerConfig::SERVER_TYPE_PRODUCTION == ServerConfig::g_ServerSetupType ||
+				ServerConfig::SERVER_TYPE_STAGING == ServerConfig::g_ServerSetupType) {
+				port = 443;
+			}
+			else {
+				port = 80;
+			}
+		}
+		auto model = getModel();
+		return JsonRequest(model->getUrl(), port);
+	}
 	
 }
 
diff --git a/login_server/src/cpp/controller/Group.h b/login_server/src/cpp/controller/Group.h
index a9b3ca55d..55b58906c 100644
--- a/login_server/src/cpp/controller/Group.h
+++ b/login_server/src/cpp/controller/Group.h
@@ -3,6 +3,8 @@
 
 #include "../model/table/Group.h"
 
+#include "../lib/JsonRequest.h"
+
 #include "Poco/SharedPtr.h"
 
 #include "TableControllerBase.h"
@@ -23,7 +25,7 @@ namespace controller {
 		inline bool deleteFromDB() { return mDBModel->deleteFromDB(); }
 
 		inline Poco::AutoPtr<model::table::Group> getModel() { return _getModel<model::table::Group>(); }
-
+		JsonRequest createJsonRequest();
 	
 	protected:
 		Group(model::table::Group* dbModel);
diff --git a/login_server/src/cpp/controller/User.cpp b/login_server/src/cpp/controller/User.cpp
index 271ddf0bf..5ea3594fc 100644
--- a/login_server/src/cpp/controller/User.cpp
+++ b/login_server/src/cpp/controller/User.cpp
@@ -591,4 +591,13 @@ namespace controller {
 		return mGroupBaseUrl;
 	}
 
+	Poco::AutoPtr<controller::Group> User::getGroup()
+	{
+		auto model = getModel();
+		if (!model->getGroupId()) {
+			return nullptr;
+		}
+		return controller::Group::load(model->getGroupId());
+	}
+
 }
diff --git a/login_server/src/cpp/controller/User.h b/login_server/src/cpp/controller/User.h
index 3cf9225be..94d52591f 100644
--- a/login_server/src/cpp/controller/User.h
+++ b/login_server/src/cpp/controller/User.h
@@ -8,6 +8,7 @@
 #include <shared_mutex>
 
 #include "TableControllerBase.h"
+#include "Group.h"
 
 enum UserState
 {
@@ -147,6 +148,7 @@ namespace controller {
 		inline int getBalance() { std::shared_lock<std::shared_mutex> _lock(mSharedMutex); return mGradidoCurrentBalance; }
 
 		std::string getGroupBaseUrl();
+		Poco::AutoPtr<controller::Group> getGroup();
 
 		// connection to other tables
 
diff --git a/login_server/src/cpp/lib/DataTypeConverter.h b/login_server/src/cpp/lib/DataTypeConverter.h
index 38249f740..3f02b961d 100644
--- a/login_server/src/cpp/lib/DataTypeConverter.h
+++ b/login_server/src/cpp/lib/DataTypeConverter.h
@@ -40,6 +40,9 @@ namespace DataTypeConverter {
 	
 	std::string binToBase64(const unsigned char* data, size_t size, int variant = sodium_base64_VARIANT_ORIGINAL);
 	inline std::string binToBase64(const MemoryBin* data, int variant = sodium_base64_VARIANT_ORIGINAL) { return binToBase64(data->data(), data->size(), variant); }
+	inline std::string binToBase64(const std::string& proto_bin, int variant = sodium_base64_VARIANT_ORIGINAL) {
+		return binToBase64((const unsigned char*)proto_bin.data(), proto_bin.size(), variant);
+	}
 	
 	std::string binToHex(const unsigned char* data, size_t size);
 	std::string binToHex(const Poco::Nullable<Poco::Data::BLOB>& nullableBin);
diff --git a/login_server/src/cpp/model/gradido/TransactionBody.cpp b/login_server/src/cpp/model/gradido/TransactionBody.cpp
index 5430ca53d..3a0cd38a6 100644
--- a/login_server/src/cpp/model/gradido/TransactionBody.cpp
+++ b/login_server/src/cpp/model/gradido/TransactionBody.cpp
@@ -319,5 +319,15 @@ namespace model {
 			}
 			return BLOCKCHAIN_UNKNOWN;
 		}
+
+		const char* TransactionBody::getBlockchainTypeString() const
+		{
+			switch (mBlockchainType) {
+			case BLOCKCHAIN_HEDERA: return "hedera";
+			case BLOCKCHAIN_MYSQL: return "mysql";
+			case BLOCKCHAIN_UNKNOWN: return "unknown";
+			}
+			return "invalid";
+		}
 	}
 }
\ No newline at end of file
diff --git a/login_server/src/cpp/model/gradido/TransactionBody.h b/login_server/src/cpp/model/gradido/TransactionBody.h
index 4451fc29b..198d0ca4b 100644
--- a/login_server/src/cpp/model/gradido/TransactionBody.h
+++ b/login_server/src/cpp/model/gradido/TransactionBody.h
@@ -82,6 +82,9 @@ namespace model {
 
 			static BlockchainType blockchainTypeFromString(const std::string& blockainTypeString);
 			inline void setBlockchainType(BlockchainType blockchainType) { mBlockchainType = blockchainType;}
+			inline bool isHederaBlockchain() { return mBlockchainType == BLOCKCHAIN_HEDERA; }
+			inline bool isMysqlBlockchain() { return mBlockchainType == BLOCKCHAIN_MYSQL; }
+			const char* getBlockchainTypeString() const;
 
 		protected:
 			TransactionBody();