diff --git a/src/cc/channels.cpp b/src/cc/channels.cpp
index 9269096cc..4ee2d73e1 100644
--- a/src/cc/channels.cpp
+++ b/src/cc/channels.cpp
@@ -811,4 +811,4 @@ UniValue ChannelsInfo(uint256 channeltxid)
         result.push_back(Pair("Error","Channel not found!"));
     }
     return(result);
-}
\ No newline at end of file
+}
diff --git a/src/komodo-tx.cpp b/src/komodo-tx.cpp
index 3165023e0..b1b478972 100644
--- a/src/komodo-tx.cpp
+++ b/src/komodo-tx.cpp
@@ -177,6 +177,37 @@ static void RegisterLoad(const std::string& strInput)
     RegisterSetJson(key, valStr);
 }
 
+
+int32_t komodo_nextheight()
+{
+    return(100000000);
+}
+
+
+// Set default values of new CMutableTransaction based on consensus rules at given height.
+CMutableTransaction CreateNewContextualCMutableTransaction(const Consensus::Params& consensusParams, int nHeight)
+{
+    CMutableTransaction mtx;
+    
+    bool isOverwintered = NetworkUpgradeActive(nHeight, consensusParams, Consensus::UPGRADE_OVERWINTER);
+    if (isOverwintered) {
+        mtx.fOverwintered = true;
+        mtx.nExpiryHeight = nHeight + 60;
+        
+        if (NetworkUpgradeActive(nHeight, consensusParams, Consensus::UPGRADE_SAPLING)) {
+            mtx.nVersionGroupId = SAPLING_VERSION_GROUP_ID;
+            mtx.nVersion = SAPLING_TX_VERSION;
+        } else {
+            mtx.nVersionGroupId = OVERWINTER_VERSION_GROUP_ID;
+            mtx.nVersion = OVERWINTER_TX_VERSION;
+            mtx.nExpiryHeight = std::min(
+                                         mtx.nExpiryHeight,
+                                         static_cast<uint32_t>(consensusParams.vUpgrades[Consensus::UPGRADE_SAPLING].nActivationHeight - 1));
+        }
+    }
+    return mtx;
+}
+
 static void MutateTxVersion(CMutableTransaction& tx, const std::string& cmdVal)
 {
     int64_t newVersion = atoi64(cmdVal);