private void GetConfirmedTransactions(PaymentAddress address, UInt64 limit, UInt64 fromHeight, Action <ErrorCode, HashList> handler)
{
GCHandle handlerHandle = GCHandle.Alloc(handler);
IntPtr handlerPtr = (IntPtr)handlerHandle;
ChainNative.kth_chain_async_confirmed_transactions(nativeInstance_, handlerPtr, address.NativeInstance, limit, fromHeight, internalGetTxnsHandler_);
}