From ecaf5ea1cfb9ab79a593571eacee6f0835295bea Mon Sep 17 00:00:00 2001
From: Andrew Chow <achow101-github@achow101.com>
Date: Mon, 5 Apr 2021 16:39:48 -0400
Subject: [PATCH] Use GetUnsignedTx when serializing in PSBTv0

If we are asked to make a PSBTv0, we may not necessarily have made an
unsigned transaction. So instead use GetUnsignedTx which will either
fetch one that already exists, or construct a new one from the stored
data. Internally we may be storing a PSBTv0 like a PSBTv2, but still
want to serialize those as v0.
---
 src/psbt.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/psbt.h b/src/psbt.h
index eeb47610c4..697d97a06d 100644
--- a/src/psbt.h
+++ b/src/psbt.h
@@ -761,7 +761,7 @@ struct PartiallySignedTransaction
 
             // Write serialized tx to a stream
             OverrideStream<Stream> os(&s, s.GetType(), s.GetVersion() | SERIALIZE_TRANSACTION_NO_WITNESS);
-            SerializeToVector(os, *tx);
+            SerializeToVector(os, GetUnsignedTx());
         }
 
         // Write xpubs