diff --git a/proto/dlt_connector.proto b/proto/dlt_connector.proto
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+++ b/proto/dlt_connector.proto
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+// Copyright 2021-2023 H2020 TeraFlow (https://www.teraflow-h2020.eu/)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+package dlt;
+
+import "context.proto";
+
+service DltConnectorService {
+  rpc RecordAllDevices (context.Empty    ) returns (context.Empty) {}
+  rpc RecordDevice     (context.DeviceId ) returns (context.Empty) {}
+
+  rpc RecordAllServices(context.Empty    ) returns (context.Empty) {}
+  rpc RecordService    (context.ServiceId) returns (context.Empty) {}
+
+  rpc RecordAllSlices  (context.Empty    ) returns (context.Empty) {}
+  rpc RecordSlice      (context.SliceId  ) returns (context.Empty) {}
+}