diff --git a/cnutil/CMakeLists.txt b/cnutil/CMakeLists.txt
index 6d97dc3..ad3791e 100644
--- a/cnutil/CMakeLists.txt
+++ b/cnutil/CMakeLists.txt
@@ -16,7 +16,7 @@ include_directories("src/external/easylogging++")
 include_directories("src/external/unbound")
 
 # Build library
-add_library(${CXXLIB} SHARED src/main.cc src/cryptonote_basic/cryptonote_format_utils.cpp
+add_library(${CXXLIB} SHARED src/cnutil.cpp src/cryptonote_basic/cryptonote_format_utils.cpp
         src/crypto/tree-hash.c src/crypto/crypto.cpp src/crypto/crypto-ops.c src/crypto/crypto-ops-data.c
         src/crypto/hash.c src/crypto/slow-hash.c
         src/crypto/oaes_lib.c src/crypto/aesb.c
diff --git a/cnutil/cnutil.go b/cnutil/cnutil.go
index 6326954..ab3d819 100644
--- a/cnutil/cnutil.go
+++ b/cnutil/cnutil.go
@@ -3,6 +3,7 @@ package cnutil
 // #cgo CFLAGS: -std=c11 -D_GNU_SOURCE
 // #cgo LDFLAGS: -L${SRCDIR} -Wl,-rpath=\$ORIGIN/cnutil -lcnutil -Wl,-rpath ${SRCDIR} -lstdc++
 // #include <stdlib.h>
+// #include <string.h>
 // #include "src/cnutil.h"
 import "C"
 import "unsafe"
@@ -18,6 +19,18 @@ func ConvertBlob(blob []byte) []byte {
 	return output
 }
 
+func GenerateAuxBlob(blob []byte) []byte {
+	input := (*C.char)(unsafe.Pointer(&blob[0]))
+
+	size := (C.uint32_t)(len(blob))
+	var out *C.char
+	blobSize := C.convert_blob_to_auxpow_blob(input, size, &out)
+	defer C.free(unsafe.Pointer(out))
+	output := make([]byte, blobSize)
+	C.memcpy(unsafe.Pointer(&output[0]), unsafe.Pointer(out), (C.size_t)(blobSize))
+	return output
+}
+
 func ValidateAddress(addr string) bool {
 	input := C.CString(addr)
 	defer C.free(unsafe.Pointer(input))
diff --git a/cnutil/src/cnutil.cpp b/cnutil/src/cnutil.cpp
index 462d2db..e7a04fe 100644
--- a/cnutil/src/cnutil.cpp
+++ b/cnutil/src/cnutil.cpp
@@ -1,11 +1,193 @@
+#include <cmath>
 #include <stdint.h>
 #include <string>
+#include <algorithm>
+#include "cryptonote_basic/cryptonote_basic.h"
 #include "cryptonote_basic/cryptonote_format_utils.h"
+#include "cryptonote_basic/blobdatatype.h"
+#include "crypto/crypto.h"
+#include "crypto/hash.h"
 #include "common/base58.h"
+#include "serialization/binary_utils.h"
 
 using namespace cryptonote;
 
-extern "C" uint32_t convert_blob(const char *blob, size_t len, char *out) {
+#define HASH_SIZE 32
+
+/*******************************************************************************************/
+/* Helper functions for merged mining - for merkle tree branch compuation. */
+
+static size_t tree_depth(size_t count)
+{
+  size_t i;
+  size_t depth = 0;
+  assert(count > 0);
+  for (i = sizeof(size_t) << 2; i > 0; i >>= 1)
+  {
+    if (count >> i > 0)
+    {
+      count >>= i;
+      depth += i;
+    }
+  }
+  return depth;
+}
+
+static void tree_branch(const char (*hashes)[HASH_SIZE], size_t count, char (*branch)[HASH_SIZE])
+{
+  size_t i, j;
+  size_t cnt = 1;
+  size_t depth = 0;
+  char (*ints)[HASH_SIZE];
+  assert(count > 0);
+  for (i = sizeof(size_t) << 2; i > 0; i >>= 1)
+  {
+    if (cnt << i <= count)
+    {
+      cnt <<= i;
+      depth += i;
+    }
+  }
+  assert(cnt == 1ULL << depth);
+  assert(depth == tree_depth(count));
+  ints = reinterpret_cast<char(*)[HASH_SIZE]>(alloca((cnt - 1) * HASH_SIZE));
+  memcpy(ints, hashes + 1, (2 * cnt - count - 1) * HASH_SIZE);
+  for (i = 2 * cnt - count, j = 2 * cnt - count - 1; j < cnt - 1; i += 2, ++j)
+  {
+    crypto::cn_fast_hash(hashes[i], 2 * HASH_SIZE, ints[j]);
+  }
+  assert(i == count);
+  while (depth > 0)
+  {
+    assert(cnt == 1ULL << depth);
+    cnt >>= 1;
+    --depth;
+    memcpy(branch[depth], ints[0], HASH_SIZE);
+    for (i = 1, j = 0; j < cnt - 1; i += 2, ++j)
+    {
+      crypto::cn_fast_hash(ints[i], 2 * HASH_SIZE, ints[j]);
+    }
+  }
+}
+
+static void tree_hash_from_branch(const char (*branch)[HASH_SIZE], size_t depth, const char* leaf, const void* path, char* root_hash)
+{
+  if (depth == 0)
+  {
+    memcpy(root_hash, leaf, HASH_SIZE);
+  }
+  else
+  {
+    char buffer[2][HASH_SIZE];
+    int from_leaf = 1;
+    char *leaf_path, *branch_path;
+    while (depth > 0)
+    {
+      --depth;
+      if (path && (((const char*) path)[depth >> 3] & (1 << (depth & 7))) != 0)
+      {
+        leaf_path = buffer[1];
+        branch_path = buffer[0];
+      }
+      else
+      {
+        leaf_path = buffer[0];
+        branch_path = buffer[1];
+      }
+      if (from_leaf)
+      {
+        memcpy(leaf_path, leaf, HASH_SIZE);
+        from_leaf = 0;
+      }
+      else
+      {
+        crypto::cn_fast_hash(buffer, 2 * HASH_SIZE, leaf_path);
+      }
+      memcpy(branch_path, branch[depth], HASH_SIZE);
+    }
+    crypto::cn_fast_hash(buffer, 2 * HASH_SIZE, root_hash);
+  }
+}
+
+
+#if 0
+class CAuxPow
+{
+public:
+    // Cryptnote coinbase tx, which contains the block hash of kevacoin block.
+    cryptonote::transaction miner_tx;
+
+    // Merkle branch is used to establish that miner_tx is part of the
+    // merkel tree whose root is merkle_root.
+    std::vector<crypto::hash>  merkle_branch;
+
+    // load
+    template <template <bool> class Archive>
+    bool do_serialize(Archive<false>& ar)
+    {
+        FIELD(miner_tx)
+        FIELD(merkle_branch)
+        return true;
+    }
+
+    // store
+    template <template <bool> class Archive>
+    bool do_serialize(Archive<true>& ar)
+    {
+        FIELD(miner_tx)
+        FIELD(merkle_branch)
+        return true;
+    }
+};
+#endif
+
+class CAuxPow
+{
+public:
+    // Cryptnote coinbase tx, which contains the block hash of kevacoin block.
+    cryptonote::transaction miner_tx;
+
+    // Merkle branch is used to establish that miner_tx is part of the
+    // merkel tree whose root is merkle_root.
+    std::vector<crypto::hash>  merkle_branch;
+
+    // load
+    template <template <bool> class Archive>
+    bool do_serialize(Archive<false>& ar)
+    {
+        FIELD(miner_tx)
+        FIELD(merkle_branch)
+        return true;
+    }
+
+    // store
+    template <template <bool> class Archive>
+    bool do_serialize(Archive<true>& ar)
+    {
+        FIELD(miner_tx)
+        FIELD(merkle_branch)
+        return true;
+    }
+};
+
+
+// Merkle branch and the whole miner tx.
+static blobdata get_block_auxpow_blob(const block& b)
+{
+    CAuxPow auxPow;
+    auxPow.miner_tx = b.miner_tx;
+
+    std::vector<crypto::hash> transactionHashes;
+    transactionHashes.push_back(cryptonote::get_transaction_hash(b.miner_tx));
+    std::copy(b.tx_hashes.begin(), b.tx_hashes.end(), std::back_inserter(transactionHashes));
+    auxPow.merkle_branch.resize(tree_depth(b.tx_hashes.size() + 1));
+    tree_branch(reinterpret_cast<const char(*)[HASH_SIZE]>(transactionHashes.data()), transactionHashes.size(),
+            reinterpret_cast<char(*)[HASH_SIZE]>(auxPow.merkle_branch.data()));
+
+    return t_serializable_object_to_blob(auxPow);
+}
+
+extern "C" uint32_t convert_blob_to_auxpow_blob(const char *blob, uint32_t len, char** out) {
     std::string input = std::string(blob, len);
     std::string output = "";
 
@@ -14,7 +196,22 @@ extern "C" uint32_t convert_blob(const char *blob, size_t len, char *out) {
         return 0;
     }
 
-    output = get_block_hashing_blob(b);
+    output = get_block_auxpow_blob(b);
+    *out = (char*)malloc(output.length());
+    output.copy(*out, output.length(), 0);
+    return output.length();
+}
+
+extern "C" uint32_t convert_blob(const char *blob, uint32_t len, char *out) {
+    std::string input = std::string(blob, len);
+    blobdata output = "";
+
+    block b = AUTO_VAL_INIT(b);
+    if (!cryptonote::parse_and_validate_block_from_blob(input, b)) {
+        return 0;
+    }
+
+    output = cryptonote::get_block_hashing_blob(b);
     output.copy(out, output.length(), 0);
     return output.length();
 }
@@ -25,3 +222,13 @@ extern "C" bool validate_address(const char *addr, size_t len) {
     uint64_t prefix;
     return tools::base58::decode_addr(addr, prefix, output);
 }
+
+
+extern "C" void cryptonight_hash(const char* input, char* output, uint32_t len) {
+    const int variant = input[0] >= 7 ? input[0] - 6 : 0;
+    crypto::cn_slow_hash(input, len, output, variant, 0, 0);
+}
+
+extern "C" void cryptonight_fast_hash(const char* input, char* output, uint32_t len) {
+    crypto::cn_fast_hash(input, len, output);
+}
diff --git a/cnutil/src/cnutil.h b/cnutil/src/cnutil.h
index fbe7033..9b0e43e 100644
--- a/cnutil/src/cnutil.h
+++ b/cnutil/src/cnutil.h
@@ -6,6 +6,7 @@ extern "C" {
 #endif
 
 uint32_t convert_blob(const char *blob, uint32_t len, char *out);
+uint32_t convert_blob_to_auxpow_blob(const char *blob, uint32_t len, char** out);
 bool validate_address(const char *addr, uint32_t len);
 
 void cryptonight_hash(const char* input, char* output, uint32_t len);
diff --git a/cnutil/src/main.cc b/cnutil/src/main.cc
deleted file mode 100644
index 3879181..0000000
--- a/cnutil/src/main.cc
+++ /dev/null
@@ -1,44 +0,0 @@
-#include <cmath>
-#include <stdint.h>
-#include <string>
-#include <algorithm>
-#include "cryptonote_basic/cryptonote_basic.h"
-#include "cryptonote_basic/cryptonote_format_utils.h"
-#include "cryptonote_basic/blobdatatype.h"
-#include "crypto/crypto.h"
-#include "crypto/hash.h"
-#include "common/base58.h"
-#include "serialization/binary_utils.h"
-
-using namespace cryptonote;
-
-extern "C" uint32_t convert_blob(const char *blob, size_t len, char *out) {
-    std::string input = std::string(blob, len);
-    blobdata output = "";
-
-    block b = AUTO_VAL_INIT(b);
-    if (!cryptonote::parse_and_validate_block_from_blob(input, b)) {
-        return 0;
-    }
-
-    output = cryptonote::get_block_hashing_blob(b);
-    output.copy(out, output.length(), 0);
-    return output.length();
-}
-
-extern "C" bool validate_address(const char *addr, size_t len) {
-    std::string input = std::string(addr, len);
-    std::string output = "";
-    uint64_t prefix;
-    return tools::base58::decode_addr(addr, prefix, output);
-}
-
-
-extern "C" void cryptonight_hash(const char* input, char* output, uint32_t len) {
-    const int variant = input[0] >= 7 ? input[0] - 6 : 0;
-    crypto::cn_slow_hash(input, len, output, variant, 0, 0);
-}
-
-extern "C" void cryptonight_fast_hash(const char* input, char* output, uint32_t len) {
-    crypto::cn_fast_hash(input, len, output);
-}
\ No newline at end of file
diff --git a/rpc/rpc.go b/rpc/rpc.go
index 4c5ec46..e4924d0 100644
--- a/rpc/rpc.go
+++ b/rpc/rpc.go
@@ -94,8 +94,8 @@ func (r *RPCClient) GetInfo() (*GetInfoReply, error) {
 	return reply, err
 }
 
-func (r *RPCClient) SubmitBlock(hash string) (*JSONRpcResp, error) {
-	return r.doPost(r.Url.String(), "submitblock", []string{hash})
+func (r *RPCClient) SubmitBlock(hash string, auxBlock string) (*JSONRpcResp, error) {
+	return r.doPost(r.Url.String(), "submitblock", []string{hash, auxBlock})
 }
 
 func (r *RPCClient) doPost(url, method string, params interface{}) (*JSONRpcResp, error) {
diff --git a/stratum/miner.go b/stratum/miner.go
index ee188a7..ac730bd 100644
--- a/stratum/miner.go
+++ b/stratum/miner.go
@@ -169,7 +169,9 @@ func (m *Miner) processShare(s *StratumServer, cs *Session, job *Job, t *BlockTe
 	block := hashDiff.Cmp(t.difficulty) >= 0
 
 	if block {
-		_, err := r.SubmitBlock(hex.EncodeToString(shareBuff))
+		// Testing, force AuxPow
+		auxBuf := cnutil.GenerateAuxBlob(shareBuff)
+		_, err := r.SubmitBlock(hex.EncodeToString(shareBuff), hex.EncodeToString(auxBuf))
 		if err != nil {
 			atomic.AddInt64(&m.rejects, 1)
 			atomic.AddInt64(&r.Rejects, 1)