From 5634b75866d9ed8cded75e35455f3ad5991299a2 Mon Sep 17 00:00:00 2001
From: Daniel Liu <139250065@qq.com>
Date: Tue, 9 Dec 2025 13:32:24 +0800
Subject: [PATCH] core/types: add derived chain ID to LegacyTx JSON encoding
 #27452 (#1792)

---
 core/types/transaction_marshalling.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/core/types/transaction_marshalling.go b/core/types/transaction_marshalling.go
index f52e8df657..668dd906c5 100644
--- a/core/types/transaction_marshalling.go
+++ b/core/types/transaction_marshalling.go
@@ -66,6 +66,9 @@ func (tx *Transaction) MarshalJSON() ([]byte, error) {
 		enc.V = (*hexutil.Big)(itx.V)
 		enc.R = (*hexutil.Big)(itx.R)
 		enc.S = (*hexutil.Big)(itx.S)
+		if tx.Protected() {
+			enc.ChainID = (*hexutil.Big)(tx.ChainId())
+		}
 
 	case *AccessListTx:
 		enc.ChainID = (*hexutil.Big)(itx.ChainID)