From 3e693e1ef6e2da69847a30a14808b327aa07060e Mon Sep 17 00:00:00 2001
From: lightclient <14004106+lightclient@users.noreply.github.com>
Date: Wed, 29 Jun 2022 11:58:59 +0200
Subject: [PATCH] internal/ethapi: return chain id for EIP-155 legacy txs
 (#25155)

---
 internal/ethapi/api.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index b05c9a08d3797..b45c1f123f589 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -1284,6 +1284,11 @@ func newRPCTransaction(tx *types.Transaction, blockHash common.Hash, blockNumber
 		result.TransactionIndex = (*hexutil.Uint64)(&index)
 	}
 	switch tx.Type() {
+	case types.LegacyTxType:
+		// if a legacy transaction has an EIP-155 chain id, include it explicitly
+		if id := tx.ChainId(); id.Sign() == 0 {
+			result.ChainID = (*hexutil.Big)(id)
+		}
 	case types.AccessListTxType:
 		al := tx.AccessList()
 		result.Accesses = &al