From 0804fc3cb11089000d3b0e8bed41df0b0bf5fff1 Mon Sep 17 00:00:00 2001
From: ishaanam <ishaana.misra@gmail.com>
Date: Tue, 8 Jul 2025 15:10:00 -0400
Subject: [PATCH] wallet: throw error at conflicting tx versions in
 pre-selected inputs

---
 src/wallet/spend.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/wallet/spend.cpp b/src/wallet/spend.cpp
index 91cdc4a894c..b65317b8e07 100644
--- a/src/wallet/spend.cpp
+++ b/src/wallet/spend.cpp
@@ -283,6 +283,14 @@ util::Result<PreSelectedInputs> FetchSelectedInputs(const CWallet& wallet, const
             if (input_bytes == -1) {
                 input_bytes = CalculateMaximumSignedInputSize(txout, &wallet, &coin_control);
             }
+            const CWalletTx& parent_tx = txo->GetWalletTx();
+            if (wallet.GetTxDepthInMainChain(parent_tx) == 0) {
+                if (parent_tx.tx->version == TRUC_VERSION && coin_control.m_version != TRUC_VERSION) {
+                    return util::Error{strprintf(_("Can't spend unconfirmed version 3 pre-selected input with a version %d tx"), coin_control.m_version)};
+                } else if (coin_control.m_version == TRUC_VERSION && parent_tx.tx->version != TRUC_VERSION) {
+                    return util::Error{strprintf(_("Can't spend unconfirmed version %d pre-selected input with a version 3 tx"), parent_tx.tx->version)};
+                }
+            }
         } else {
             // The input is external. We did not find the tx in mapWallet.
             const auto out{coin_control.GetExternalOutput(outpoint)};