diff --git a/driver/chain_syncer/chain_syncer_test.go b/driver/chain_syncer/chain_syncer_test.go
index 8fe500d85..b8a8b7a5c 100644
--- a/driver/chain_syncer/chain_syncer_test.go
+++ b/driver/chain_syncer/chain_syncer_test.go
@@ -1,6 +1,7 @@
 package chainSyncer
 
 import (
+	"bytes"
 	"context"
 
 	"os"
@@ -64,6 +65,7 @@ func (s *ChainSyncerTestSuite) SetupTest() {
 		PseZkevmTierFee:               common.Big256,
 		MaxTierFeePriceBumpIterations: 3,
 		TierFeePriceBump:              common.Big2,
+		ExtraData:                     "test",
 	})))
 
 	s.p = prop
@@ -97,7 +99,7 @@ func (s *ChainSyncerTestSuite) TestAheadOfProtocolVerifiedHead2() {
 
 	l2Head, err := s.RpcClient.L2.HeaderByNumber(context.Background(), nil)
 	s.Nil(err)
-
+	s.Equal("test", string(bytes.TrimRight(l2Head.Extra, "\x00")))
 	log.Info("L1HeaderByNumber head", "number", head.Number)
 	// (equiv to s.state.GetL2Head().Number)
 	log.Info("L2HeaderByNumber head", "number", l2Head.Number)
diff --git a/proposer/proposer.go b/proposer/proposer.go
index 45b71d25e..90a4c2544 100644
--- a/proposer/proposer.go
+++ b/proposer/proposer.go
@@ -1,6 +1,7 @@
 package proposer
 
 import (
+	"bytes"
 	"context"
 	"crypto/ecdsa"
 	"errors"
@@ -490,7 +491,7 @@ func (p *Proposer) initTierFees() error {
 		log.Info(
 			"Protocol tier",
 			"id", tier.ID,
-			"name", string(tier.VerifierName[:]),
+			"name", string(bytes.TrimRight(tier.VerifierName[:], "\x00")),
 			"validityBond", tier.ValidityBond,
 			"contestBond", tier.ContestBond,
 			"provingWindow", tier.ProvingWindow,
diff --git a/proposer/proposer_test.go b/proposer/proposer_test.go
index 4099f111e..f4ee146db 100644
--- a/proposer/proposer_test.go
+++ b/proposer/proposer_test.go
@@ -51,6 +51,7 @@ func (s *ProposerTestSuite) SetupTest() {
 		PseZkevmTierFee:                     common.Big256,
 		TierFeePriceBump:                    common.Big2,
 		MaxTierFeePriceBumpIterations:       3,
+		ExtraData:                           "test",
 	})))
 
 	s.p = p