From 8985184efc6b6598dc61a8e1e73480c2a6381bf8 Mon Sep 17 00:00:00 2001
From: Shargon <shargon@gmail.com>
Date: Thu, 30 Jan 2020 18:31:51 +0100
Subject: [PATCH] Allow to get the current tx

---
 .../InteropService.Blockchain.cs              | 21 +++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/src/neo/SmartContract/InteropService.Blockchain.cs b/src/neo/SmartContract/InteropService.Blockchain.cs
index b31aba4a32..60e6e1906d 100644
--- a/src/neo/SmartContract/InteropService.Blockchain.cs
+++ b/src/neo/SmartContract/InteropService.Blockchain.cs
@@ -45,8 +45,25 @@ private static bool Blockchain_GetBlock(ApplicationEngine engine)
 
             private static bool Blockchain_GetTransaction(ApplicationEngine engine)
             {
-                ReadOnlySpan<byte> hash = engine.CurrentContext.EvaluationStack.Pop().GetSpan();
-                Transaction tx = engine.Snapshot.GetTransaction(new UInt256(hash));
+                Transaction tx;
+                StackItem item = engine.CurrentContext.EvaluationStack.Pop();
+
+                if (item.IsNull)
+                {
+                    if (engine.ScriptContainer is Transaction senderTx)
+                    {
+                        tx = senderTx;
+                    }
+                    else
+                    {
+                        return false;
+                    }
+                }
+                else
+                {
+                    tx = engine.Snapshot.GetTransaction(new UInt256(item.GetSpan()));
+                }
+
                 if (tx == null)
                     engine.CurrentContext.EvaluationStack.Push(StackItem.Null);
                 else