diff --git a/src/include/taler_json_lib.h b/src/include/taler_json_lib.h
index 6adb76b24..16863803e 100644
--- a/src/include/taler_json_lib.h
+++ b/src/include/taler_json_lib.h
@@ -154,19 +154,6 @@ TALER_JSON_merchant_wire_signature_hash (const json_t *wire_s,
                                          struct GNUNET_HashCode *hc);
 
 
-/**
- * Compute the hash of the given wire details.   The resulting
- * hash is what is signed by the master public key.
- *
- * @param wire_s wire details to hash
- * @param hc[out] set to the hash
- * @return #GNUNET_OK on success, #GNUNET_SYSERR if @a wire_s is malformed
- */
-int
-TALER_JSON_exchange_wire_signature_hash (const json_t *wire_s,
-                                         struct GNUNET_HashCode *hc);
-
-
 /**
  * Check the signature in @a wire_s.
  *
diff --git a/src/json/json_wire.c b/src/json/json_wire.c
index 06d39118a..5052f458f 100644
--- a/src/json/json_wire.c
+++ b/src/json/json_wire.c
@@ -24,38 +24,6 @@
 #include "taler_json_lib.h"
 
 
-/**
- * Compute the hash of the given wire details.   The resulting
- * hash is what is put into the contract.
- *
- * @param wire_s wire details to hash
- * @param hc[out] set to the hash
- * @return #GNUNET_OK on success, #GNUNET_SYSERR if @a wire_s is malformed
- */
-int
-TALER_JSON_exchange_wire_signature_hash (const json_t *wire_s,
-                                         struct GNUNET_HashCode *hc)
-{
-  const char *payto_url;
-  struct GNUNET_JSON_Specification spec[] = {
-    GNUNET_JSON_spec_string ("url", &payto_url),
-    GNUNET_JSON_spec_end ()
-  };
-
-  if (GNUNET_OK !=
-      GNUNET_JSON_parse (wire_s,
-                         spec,
-                         NULL, NULL))
-  {
-    GNUNET_break_op (0);
-    return GNUNET_SYSERR;
-  }
-  TALER_exchange_wire_signature_hash (payto_url,
-                                      hc);
-  return GNUNET_OK;
-}
-
-
 /**
  * Compute the hash of the given wire details.   The resulting
  * hash is what is put into the contract.