+/**
+ * Perform an asynchronous reverse lookup operation on the GNS.
+ *
+ * @param handle handle to the GNS service
+ * @param zone_key zone to find a name for
+ * @param root_key our zone
+ * @param proc processor to call on result
+ * @param proc_cls closure for @a proc
+ * @return handle to the request
+ */
+struct GNUNET_GNS_ReverseLookupRequest*
+GNUNET_GNS_reverse_lookup (struct GNUNET_GNS_Handle *handle,
+ const struct GNUNET_CRYPTO_EcdsaPublicKey *zone_key,
+ const struct GNUNET_CRYPTO_EcdsaPublicKey *root_key,
+ GNUNET_GNS_ReverseLookupResultProcessor proc,
+ void *proc_cls);
+