From 57275e661a763dc7eff126a30a9f476a8e3f0126 Mon Sep 17 00:00:00 2001
From: Geert G <117188496+cll-gg@users.noreply.github.com>
Date: Tue, 3 Mar 2026 12:33:34 +0000
Subject: [PATCH] OEV-851 Send dualBroadcast params in TxMessage

---
 pkg/txm/metrics.go      | 20 ++++++----
 pkg/txm/metrics_test.go | 83 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 96 insertions(+), 7 deletions(-)

diff --git a/pkg/txm/metrics.go b/pkg/txm/metrics.go
index d47de2cd5e..da78100d6b 100644
--- a/pkg/txm/metrics.go
+++ b/pkg/txm/metrics.go
@@ -134,14 +134,20 @@ func (m *txmMetrics) EmitTxMessage(ctx context.Context, txHash common.Hash, from
 		toAddress = tx.ToAddress
 	}
 
+	var dualBroadcastParams *string
+	if meta != nil && meta.DualBroadcast != nil && *meta.DualBroadcast {
+		dualBroadcastParams = meta.DualBroadcastParams
+	}
+
 	message := &svrv1.TxMessage{
-		Hash:        txHash.String(),
-		FromAddress: fromAddress.String(),
-		ToAddress:   toAddress.String(),
-		Nonce:       strconv.FormatUint(*tx.Nonce, 10),
-		CreatedAt:   time.Now().UnixMicro(),
-		ChainId:     m.chainID.String(),
-		FeedAddress: destAddress,
+		Hash:                txHash.String(),
+		FromAddress:         fromAddress.String(),
+		ToAddress:           toAddress.String(),
+		Nonce:               strconv.FormatUint(*tx.Nonce, 10),
+		CreatedAt:           time.Now().UnixMicro(),
+		ChainId:             m.chainID.String(),
+		FeedAddress:         destAddress,
+		DualBroadcastParams: dualBroadcastParams,
 	}
 
 	messageBytes, err := proto.Marshal(message)
diff --git a/pkg/txm/metrics_test.go b/pkg/txm/metrics_test.go
index 15faa1d895..a1207940dc 100644
--- a/pkg/txm/metrics_test.go
+++ b/pkg/txm/metrics_test.go
@@ -1,6 +1,7 @@
 package txm
 
 import (
+	"encoding/json"
 	"strconv"
 	"testing"
 
@@ -10,6 +11,7 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"github.com/smartcontractkit/chainlink-common/pkg/beholder/beholdertest"
+	"github.com/smartcontractkit/chainlink-common/pkg/sqlutil"
 	"github.com/smartcontractkit/chainlink-evm/pkg/testutils"
 	"github.com/smartcontractkit/chainlink-evm/pkg/txm/types"
 	svrv1 "github.com/smartcontractkit/chainlink-protos/svr/v1"
@@ -115,6 +117,87 @@ func TestEmitTxMessage(t *testing.T) {
 		assert.Equal(t, expectedChain.String(), actualMessage.ChainId)
 		assert.Equal(t, "", actualMessage.FeedAddress)
 	})
+
+	t.Run("populates dual_broadcast_params when tx is a dual-broadcast secondary tx", func(t *testing.T) {
+		// GIVEN
+		ctx := t.Context()
+		beholderTester := beholdertest.NewObserver(t)
+
+		toAddress := testutils.NewAddress()
+		fromAddress := testutils.NewAddress()
+		expectedNonce := uint64(7)
+		expectedChain := testutils.FixtureChainID
+		expectedParams := "hint=calldata&hint=logs&builder=flashbots"
+		isDualBroadcast := true
+
+		metaBytes, err := json.Marshal(types.TxMeta{
+			DualBroadcast:       &isDualBroadcast,
+			DualBroadcastParams: &expectedParams,
+		})
+		require.NoError(t, err)
+		meta := sqlutil.JSON(metaBytes)
+
+		txmMetrics, err := NewTxmMetrics(expectedChain)
+		require.NoError(t, err)
+
+		tx := &types.Transaction{
+			IsPurgeable: false,
+			FromAddress: fromAddress,
+			ToAddress:   toAddress,
+			Nonce:       &expectedNonce,
+			Meta:        &meta,
+		}
+
+		// WHEN
+		err = txmMetrics.EmitTxMessage(ctx, common.Hash{}, fromAddress, tx)
+		require.NoError(t, err)
+
+		// THEN
+		messages := beholderTester.Messages(t)
+		assert.Len(t, messages, 1)
+
+		var actualMessage svrv1.TxMessage
+		err = proto.Unmarshal(messages[0].Body, &actualMessage)
+		require.NoError(t, err)
+
+		require.NotNil(t, actualMessage.DualBroadcastParams)
+		assert.Equal(t, expectedParams, *actualMessage.DualBroadcastParams)
+	})
+
+	t.Run("does not set dual_broadcast_params for a primary (non-dual-broadcast) tx", func(t *testing.T) {
+		// GIVEN
+		ctx := t.Context()
+		beholderTester := beholdertest.NewObserver(t)
+
+		toAddress := testutils.NewAddress()
+		fromAddress := testutils.NewAddress()
+		expectedNonce := uint64(3)
+		expectedChain := testutils.FixtureChainID
+
+		txmMetrics, err := NewTxmMetrics(expectedChain)
+		require.NoError(t, err)
+
+		tx := &types.Transaction{
+			IsPurgeable: false,
+			FromAddress: fromAddress,
+			ToAddress:   toAddress,
+			Nonce:       &expectedNonce,
+		}
+
+		// WHEN
+		err = txmMetrics.EmitTxMessage(ctx, common.Hash{}, fromAddress, tx)
+		require.NoError(t, err)
+
+		// THEN
+		messages := beholderTester.Messages(t)
+		assert.Len(t, messages, 1)
+
+		var actualMessage svrv1.TxMessage
+		err = proto.Unmarshal(messages[0].Body, &actualMessage)
+		require.NoError(t, err)
+
+		assert.Nil(t, actualMessage.DualBroadcastParams)
+	})
 }
 
 func TestReachedMaxAttempts(t *testing.T) {