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diff --git a/src/messenger/gnunet-service-messenger_operation_store.h b/src/messenger/gnunet-service-messenger_operation_store.h
new file mode 100644
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+++ b/src/messenger/gnunet-service-messenger_operation_store.h
@@ -0,0 +1,131 @@
+/*
+   This file is part of GNUnet.
+   Copyright (C) 2021 GNUnet e.V.
+
+   GNUnet is free software: you can redistribute it and/or modify it
+   under the terms of the GNU Affero General Public License as published
+   by the Free Software Foundation, either version 3 of the License,
+   or (at your option) any later version.
+
+   GNUnet is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+   SPDX-License-Identifier: AGPL3.0-or-later
+ */
+/**
+ * @author Tobias Frisch
+ * @file src/messenger/gnunet-service-messenger_operation_store.h
+ * @brief GNUnet MESSENGER service
+ */
+
+#ifndef GNUNET_SERVICE_MESSENGER_OPERATION_STORE_H
+#define GNUNET_SERVICE_MESSENGER_OPERATION_STORE_H
+
+#include "platform.h"
+#include "gnunet_container_lib.h"
+#include "gnunet_crypto_lib.h"
+#include "gnunet_scheduler_lib.h"
+#include "gnunet_time_lib.h"
+
+struct GNUNET_MESSENGER_SrvRoom;
+
+struct GNUNET_MESSENGER_OperationStore
+{
+  struct GNUNET_MESSENGER_SrvRoom *room;
+
+  struct GNUNET_CONTAINER_MultiHashMap *operations;
+};
+
+/**
+ * Initializes an operation <i>store</i> as fully empty with a given <i>room</i>.
+ *
+ * @param[out] store Operation store
+ * @param[in/out] room Room
+ */
+void
+init_operation_store (struct GNUNET_MESSENGER_OperationStore *store, struct GNUNET_MESSENGER_SrvRoom *room);
+
+/**
+ * Clears an operation <i>store</i>, stops all operations and deallocates its memory.
+ *
+ * @param[in/out] store Operation store
+ */
+void
+clear_operation_store (struct GNUNET_MESSENGER_OperationStore *store);
+
+/**
+ * Loads operations from a <i>directory</i> into an operation <i>store</i>.
+ *
+ * @param[out] store Operation store
+ * @param[in] directory Path to a directory
+ */
+void
+load_operation_store (struct GNUNET_MESSENGER_OperationStore *store,
+                      const char *directory);
+
+/**
+ * Saves operations from an operation <i>store</i> into a <i>directory</i>.
+ *
+ * @param[in] store Operation store
+ * @param[in] directory Path to a directory
+ */
+void
+save_operation_store (const struct GNUNET_MESSENGER_OperationStore *store,
+                      const char *directory);
+
+/**
+ * Retruns the type of the active operation under a given <i>hash</i> in
+ * a specific operation <i>store</i>. If there is no active operation under
+ * the given <i>hash</i>, #GNUNET_MESSENGER_OP_UNKNOWN gets returned instead.
+ *
+ * @param[in] store Operation store
+ * @param[in] hash Hash of message
+ * @return Type of operation or #GNUNET_MESSENGER_OP_UNKNOWN
+ */
+enum GNUNET_MESSENGER_OperationType
+get_store_operation_type (const struct GNUNET_MESSENGER_OperationStore *store,
+                          const struct GNUNET_HashCode *hash);
+
+/**
+ * Tries to use an operation under a given <i>hash</i> in a specific
+ * operation <i>store</i>. The operation will use the selected <i>type</i>
+ * if successful. The operation will be delayed by a given <i>delay</i>.
+ *
+ * If the selected type is #GNUNET_MESSENGER_OP_DELETE any active operation
+ * under the given hash will be stopped and replaced.
+ *
+ * If the new operation could be started successfully the method returns
+ * #GNUNET_OK, otherwise #GNUNET_SYSERR.
+ *
+ * @param[in/out] store Operation store
+ * @param[in] hash Hash of message
+ * @param[in] type Operation type
+ * @param[in] delay Delay
+ * @return #GNUNET_OK on success, otherwise #GNUNET_SYSERR
+ */
+int
+use_store_operation (struct GNUNET_MESSENGER_OperationStore *store,
+                     const struct GNUNET_HashCode *hash,
+                     enum GNUNET_MESSENGER_OperationType type,
+                     struct GNUNET_TIME_Relative delay);
+
+/**
+ * Stops any active operation under a given <i>hash</i> in a specific
+ * operation <i>store</i>.
+ *
+ * Beware that calling this method will also implicitly free the memory
+ * of any active operation under the given hash!
+ *
+ * @param[in/out] store Operation store
+ * @param[in] hash Hash of message
+ */
+void
+cancel_store_operation (struct GNUNET_MESSENGER_OperationStore *store,
+                        const struct GNUNET_HashCode *hash);
+
+#endif //GNUNET_SERVICE_MESSENGER_OPERATION_STORE_H