diff --git a/src/Makefile.zcash.include b/src/Makefile.zcash.include
index 341ba2736..59aeb861f 100644
--- a/src/Makefile.zcash.include
+++ b/src/Makefile.zcash.include
@@ -1,5 +1,6 @@
 bin_PROGRAMS += \
-  zcash/GenerateParams 
+  zcash/GenerateParams \
+  zcash/CreateJoinSplit
 
 # tool for generating our public parameters
 zcash_GenerateParams_SOURCES = zcash/GenerateParams.cpp
@@ -9,3 +10,13 @@ zcash_GenerateParams_LDADD = \
   $(LIBBITCOIN_UTIL) \
   $(LIBBITCOIN_CRYPTO) \
   $(LIBZCASH_LIBS)
+
+# tool for profiling the creation of joinsplits
+zcash_CreateJoinSplit_SOURCES = zcash/CreateJoinSplit.cpp
+zcash_CreateJoinSplit_LDADD = \
+  $(LIBBITCOIN_COMMON) \
+  $(LIBBITCOIN_UTIL) \
+  $(LIBBITCOIN_CRYPTO) \
+  $(LIBZCASH) \
+  $(BOOST_LIBS) \
+  $(LIBZCASH_LIBS)
diff --git a/src/zcash/CreateJoinSplit.cpp b/src/zcash/CreateJoinSplit.cpp
new file mode 100644
index 000000000..65dc7f65c
--- /dev/null
+++ b/src/zcash/CreateJoinSplit.cpp
@@ -0,0 +1,32 @@
+// Copyright (c) 2016 The Zcash developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "../util.h"
+#include "primitives/transaction.h"
+#include "zcash/JoinSplit.hpp"
+
+using namespace libzcash;
+
+int main(int argc, char **argv)
+{
+    auto p = ZCJoinSplit::Unopened();
+    p->loadVerifyingKey((ZC_GetParamsDir() / "sprout-verifying.key").string());
+    p->setProvingKeyPath((ZC_GetParamsDir() / "sprout-proving.key").string());
+    p->loadProvingKey();
+
+    // construct a proof.
+
+    for (int i = 0; i < 5; i++) {
+        uint256 anchor = ZCIncrementalMerkleTree().root();
+        uint256 pubKeyHash;
+
+        JSDescription jsdesc(*p,
+                             pubKeyHash,
+                             anchor,
+                             {JSInput(), JSInput()},
+                             {JSOutput(), JSOutput()},
+                             0,
+                             0);
+    }
+}