diff --git a/src/main/c/nativewrapper.c b/src/main/c/nativewrapper.c
index 353f264..fa489ae 100644
--- a/src/main/c/nativewrapper.c
+++ b/src/main/c/nativewrapper.c
@@ -1120,20 +1120,18 @@ JNIEXPORT jobject JNICALL Java_source_defra_DefraNode_RefreshViewNative(
 //=============================================================================
 
 // Bound under DefraNode (not DefraTransaction, despite the C symbol name
-// below being left as-is for now) with the 3-arg signature DefraNode.java
-// actually declares (TransactionCreateNative(long, boolean isConcurrent,
-// boolean isReadOnly)) - the previous 2-arg version here didn't match that
-// declaration's arity, and was registered under the wrong class name.
-// isConcurrent has no corresponding parameter in the C API and is accepted
-// but ignored.
+// below being left as-is for now) with the 2-arg signature DefraNode.java
+// actually declares (TransactionCreateNative(long, boolean isReadOnly)) - the
+// previous version here didn't match that declaration's arity, and was
+// registered under the wrong class name. isConcurrent was removed from both
+// this native method and the cbindings CreateTransaction API it wraps, which
+// never had a corresponding parameter for it.
 JNIEXPORT jobject JNICALL Java_source_defra_DefraNode_TransactionCreateNative(
     JNIEnv* env,
     jobject thiz,
     jlong nodePtr,
-    jboolean isConcurrent,
     jboolean isReadOnly
 ) {
-    (void)isConcurrent;
     int isReadOnlyC = (isReadOnly == JNI_TRUE) ? 1 : 0;
     NewTxnResult res = CreateTransaction((uintptr_t)nodePtr, isReadOnlyC);
     return returnDefraTransactionResult(env, res);
diff --git a/src/main/java/source/defra/DefraNode.java b/src/main/java/source/defra/DefraNode.java
index e90c7be..37a8228 100644
--- a/src/main/java/source/defra/DefraNode.java
+++ b/src/main/java/source/defra/DefraNode.java
@@ -102,7 +102,7 @@ public class DefraNode {
     private native DefraResult VerifyBlockSignatureNative(long nodePtr, String keyType, String publicKey, String cid, long identityPtr);
     
     // Transaction Methods
-    private native DefraTransactionResult TransactionCreateNative(long nodePtr, boolean isConcurrent, boolean isReadOnly);
+    private native DefraTransactionResult TransactionCreateNative(long nodePtr, boolean isReadOnly);
     
 	// Private members
     private long nodePtr;
@@ -1051,8 +1051,8 @@ public String verifyBlockSignature(String keyType, String publicKey, String cid,
     }
 
     // Function creates a new transaction
-    public DefraTransaction transactionCreate(boolean isConcurrent, boolean isReadOnly) throws DefraException {
-        DefraTransactionResult txnResult = TransactionCreateNative(this.nodePtr, isConcurrent, isReadOnly);
+    public DefraTransaction transactionCreate(boolean isReadOnly) throws DefraException {
+        DefraTransactionResult txnResult = TransactionCreateNative(this.nodePtr, isReadOnly);
         if (txnResult.status != 0) {
             throw new DefraException(txnResult.error);
         }