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diff --git a/src/contrib/service/abd/abd_serialization.h b/src/contrib/service/abd/abd_serialization.h
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index 000000000..21dc45a7b
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+++ b/src/contrib/service/abd/abd_serialization.h
@@ -0,0 +1,167 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2009-2013, 2016 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
+*/
+
+
+/**
+ * @file abd/abd_serialization.h
+ * @brief API to serialize and deserialize delegation chains
+ * and abds
+ * @author Martin Schanzenbach
+ */
+#ifndef ABD_SERIALIZATION_H
+#define ABD_SERIALIZATION_H
+
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_constants.h"
+#include "gnunet_abd_service.h"
+
+/**
+ * Calculate how many bytes we will need to serialize
+ * the given delegation record
+ *
+ * @param ds_count number of delegation chain entries
+ * @param dsr array of #GNUNET_ABD_Delegation
+ * @return the required size to serialize
+ */
+size_t
+GNUNET_ABD_delegation_set_get_size (
+  unsigned int ds_count,
+  const struct GNUNET_ABD_DelegationSet *dsr);
+
+/**
+ * Serizalize the given delegation record entries
+ *
+ * @param d_count number of delegation chain entries
+ * @param dsr array of #GNUNET_ABD_Delegation
+ * @param dest_size size of the destination
+ * @param dest where to store the result
+ * @return the size of the data, -1 on failure
+ */
+ssize_t
+GNUNET_ABD_delegation_set_serialize (
+  unsigned int d_count,
+  const struct GNUNET_ABD_DelegationSet *dsr,
+  size_t dest_size,
+  char *dest);
+
+
+/**
+ * Deserialize the given destination
+ *
+ * @param len size of the serialized delegation recird
+ * @param src the serialized data
+ * @param d_count the number of delegation chain entries
+ * @param dsr where to put the delegation chain entries
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+int
+GNUNET_ABD_delegation_set_deserialize (
+  size_t len,
+  const char *src,
+  unsigned int d_count,
+  struct GNUNET_ABD_DelegationSet *dsr);
+
+/**
+   * Calculate how many bytes we will need to serialize
+   * the given delegation chain and abd
+   *
+   * @param d_count number of delegation chain entries
+   * @param dd array of #GNUNET_ABD_Delegation
+   * @param c_count number of abd entries
+   * @param cd a #GNUNET_ABD_Delegate
+   * @return the required size to serialize
+   */
+size_t
+GNUNET_ABD_delegation_chain_get_size (
+  unsigned int d_count,
+  const struct GNUNET_ABD_Delegation *dd,
+  unsigned int c_count,
+  const struct GNUNET_ABD_Delegate *cd);
+
+/**
+   * Serizalize the given delegation chain entries and abd
+   *
+   * @param d_count number of delegation chain entries
+   * @param dd array of #GNUNET_ABD_Delegation
+   * @param c_count number of abd entries
+   * @param cd a #GNUNET_ABD_Delegate
+   * @param dest_size size of the destination
+   * @param dest where to store the result
+   * @return the size of the data, -1 on failure
+   */
+ssize_t
+GNUNET_ABD_delegation_chain_serialize (
+  unsigned int d_count,
+  const struct GNUNET_ABD_Delegation *dd,
+  unsigned int c_count,
+  const struct GNUNET_ABD_Delegate *cd,
+  size_t dest_size,
+  char *dest);
+
+
+/**
+   * Deserialize the given destination
+   *
+   * @param len size of the serialized delegation chain and cred
+   * @param src the serialized data
+   * @param d_count the number of delegation chain entries
+   * @param dd where to put the delegation chain entries
+   * @param c_count number of abd entries
+   * @param cd where to put the abd data
+   * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+   */
+int
+GNUNET_ABD_delegation_chain_deserialize (
+  size_t len,
+  const char *src,
+  unsigned int d_count,
+  struct GNUNET_ABD_Delegation *dd,
+  unsigned int c_count,
+  struct GNUNET_ABD_Delegate *cd);
+
+size_t
+GNUNET_ABD_delegates_get_size (
+  unsigned int c_count,
+  const struct GNUNET_ABD_Delegate *cd);
+
+ssize_t
+GNUNET_ABD_delegates_serialize (
+  unsigned int c_count,
+  const struct GNUNET_ABD_Delegate *cd,
+  size_t dest_size,
+  char *dest);
+
+
+int
+GNUNET_ABD_delegates_deserialize (size_t len,
+                                  const char *src,
+                                  unsigned int c_count,
+                                  struct GNUNET_ABD_Delegate *cd);
+
+int
+GNUNET_ABD_delegate_serialize (struct GNUNET_ABD_Delegate *cred,
+                               char **data);
+
+struct GNUNET_ABD_Delegate *
+GNUNET_ABD_delegate_deserialize (const char *data, size_t data_size);
+
+#endif
+/* end of abd_serialization.h */