diff --git a/api/blockdaoservice.go b/api/blockdaoservice.go
index 3a1b62fa83..4a7da209c0 100644
--- a/api/blockdaoservice.go
+++ b/api/blockdaoservice.go
@@ -152,12 +152,7 @@ func (service *blockDAOService) FooterByHeight(_ context.Context, request *block
 	if err != nil {
 		return nil, err
 	}
-	footerpb, err := footer.ConvertToBlockFooterPb()
-	if err != nil {
-		return nil, err
-	}
-
 	return &blockdaopb.FooterResponse{
-		Footer: footerpb,
+		Footer: footer.Proto(),
 	}, nil
 }
diff --git a/blockchain/block/block.go b/blockchain/block/block.go
index 36d281d4de..edf1ab91fb 100644
--- a/blockchain/block/block.go
+++ b/blockchain/block/block.go
@@ -32,14 +32,10 @@ type Block struct {
 
 // ConvertToBlockPb converts Block to Block
 func (b *Block) ConvertToBlockPb() *iotextypes.Block {
-	footer, err := b.ConvertToBlockFooterPb()
-	if err != nil {
-		log.L().Panic("failed to convert block footer to protobuf message")
-	}
 	return &iotextypes.Block{
 		Header: b.Header.Proto(),
 		Body:   b.Body.Proto(),
-		Footer: footer,
+		Footer: b.Footer.Proto(),
 	}
 }
 
diff --git a/blockchain/block/footer.go b/blockchain/block/footer.go
index a79028760a..9922ba5f2a 100644
--- a/blockchain/block/footer.go
+++ b/blockchain/block/footer.go
@@ -21,20 +21,16 @@ type Footer struct {
 	commitTime   time.Time
 }
 
-// ConvertToBlockFooterPb converts BlockFooter
-func (f *Footer) ConvertToBlockFooterPb() (*iotextypes.BlockFooter, error) {
+// Proto converts BlockFooter
+func (f *Footer) Proto() *iotextypes.BlockFooter {
 	pb := iotextypes.BlockFooter{}
 	commitTime := timestamppb.New(f.commitTime)
 	pb.Timestamp = commitTime
 	pb.Endorsements = []*iotextypes.Endorsement{}
 	for _, en := range f.endorsements {
-		ePb, err := en.Proto()
-		if err != nil {
-			return nil, err
-		}
-		pb.Endorsements = append(pb.Endorsements, ePb)
+		pb.Endorsements = append(pb.Endorsements, en.Proto())
 	}
-	return &pb, nil
+	return &pb
 }
 
 // ConvertFromBlockFooterPb converts BlockFooter to BlockFooter
@@ -75,11 +71,7 @@ func (f *Footer) Endorsements() []*endorsement.Endorsement {
 
 // Serialize returns the serialized byte stream of the block footer
 func (f *Footer) Serialize() ([]byte, error) {
-	pb, err := f.ConvertToBlockFooterPb()
-	if err != nil {
-		return nil, err
-	}
-	return proto.Marshal(pb)
+	return proto.Marshal(f.Proto())
 }
 
 // Deserialize loads from the serialized byte stream
diff --git a/blockchain/block/footer_test.go b/blockchain/block/footer_test.go
index 8aad685f06..9a8c946dd5 100644
--- a/blockchain/block/footer_test.go
+++ b/blockchain/block/footer_test.go
@@ -20,14 +20,12 @@ import (
 func TestConvertToBlockFooterPb(t *testing.T) {
 	require := require.New(t)
 	footer := &Footer{nil, time.Now()}
-	blockFooter, err := footer.ConvertToBlockFooterPb()
-	require.NoError(err)
+	blockFooter := footer.Proto()
 	require.NotNil(blockFooter)
 	require.Equal(0, len(blockFooter.Endorsements))
 
 	footer = makeFooter()
-	blockFooter, err = footer.ConvertToBlockFooterPb()
-	require.NoError(err)
+	blockFooter = footer.Proto()
 	require.NotNil(blockFooter)
 	require.Equal(1, len(blockFooter.Endorsements))
 }
diff --git a/consensus/scheme/rolldpos/blockproposal.go b/consensus/scheme/rolldpos/blockproposal.go
index 76cf87308d..e98fd8c0d6 100644
--- a/consensus/scheme/rolldpos/blockproposal.go
+++ b/consensus/scheme/rolldpos/blockproposal.go
@@ -34,11 +34,7 @@ func (bp *blockProposal) Proto() (*iotextypes.BlockProposal, error) {
 	bPb := bp.block.ConvertToBlockPb()
 	endorsements := []*iotextypes.Endorsement{}
 	for _, en := range bp.proofOfLock {
-		ePb, err := en.Proto()
-		if err != nil {
-			return nil, err
-		}
-		endorsements = append(endorsements, ePb)
+		endorsements = append(endorsements, en.Proto())
 	}
 	return &iotextypes.BlockProposal{
 		Block:        bPb,
diff --git a/consensus/scheme/rolldpos/endorsedconsensusmessage.go b/consensus/scheme/rolldpos/endorsedconsensusmessage.go
index fd018c4b53..42c3f4b112 100644
--- a/consensus/scheme/rolldpos/endorsedconsensusmessage.go
+++ b/consensus/scheme/rolldpos/endorsedconsensusmessage.go
@@ -50,13 +50,9 @@ func (ecm *EndorsedConsensusMessage) Height() uint64 {
 
 // Proto converts an endorsement to endorse proto
 func (ecm *EndorsedConsensusMessage) Proto() (*iotextypes.ConsensusMessage, error) {
-	ebp, err := ecm.endorsement.Proto()
-	if err != nil {
-		return nil, err
-	}
 	cmsg := &iotextypes.ConsensusMessage{
 		Height:      ecm.height,
-		Endorsement: ebp,
+		Endorsement: ecm.endorsement.Proto(),
 	}
 	switch message := ecm.message.(type) {
 	case *ConsensusVote:
diff --git a/consensus/scheme/rolldpos/endorsementmanager.go b/consensus/scheme/rolldpos/endorsementmanager.go
index de7819bde4..f977c038d3 100644
--- a/consensus/scheme/rolldpos/endorsementmanager.go
+++ b/consensus/scheme/rolldpos/endorsementmanager.go
@@ -60,11 +60,7 @@ func (ee *endorserEndorsementCollection) toProto(endorser string) (*endorsementp
 	eeProto.Endorser = endorser
 	for topic, endorse := range ee.endorsements {
 		eeProto.Topics = append(eeProto.Topics, uint32(topic))
-		ioEndorsement, err := endorse.Proto()
-		if err != nil {
-			return nil, err
-		}
-		eeProto.Endorsements = append(eeProto.Endorsements, ioEndorsement)
+		eeProto.Endorsements = append(eeProto.Endorsements, endorse.Proto())
 	}
 	return eeProto, nil
 }
diff --git a/consensus/scheme/rolldpos/endorsementmanager_test.go b/consensus/scheme/rolldpos/endorsementmanager_test.go
index 423f450ca1..2c49090ea6 100644
--- a/consensus/scheme/rolldpos/endorsementmanager_test.go
+++ b/consensus/scheme/rolldpos/endorsementmanager_test.go
@@ -195,10 +195,8 @@ func TestEndorsementManagerProto(t *testing.T) {
 	require.NoError(em.SetMintedBlock(&b))
 
 	//test converting endorsement pb
-	endProto, err := end.Proto()
-	require.NoError(err)
 	end2 := &endorsement.Endorsement{}
-	require.NoError(end2.LoadProto(endProto))
+	require.NoError(end2.LoadProto(end.Proto()))
 	require.Equal(end, end2)
 
 	//test converting emanager pb
diff --git a/consensus/scheme/rolldpos/rolldpos_test.go b/consensus/scheme/rolldpos/rolldpos_test.go
index 1301a230f6..cbcb3ccd42 100644
--- a/consensus/scheme/rolldpos/rolldpos_test.go
+++ b/consensus/scheme/rolldpos/rolldpos_test.go
@@ -179,9 +179,7 @@ func makeBlock(t *testing.T, accountIndex, numOfEndosements int, makeInvalidEndo
 		}
 		en, err := endorsement.Endorse(identityset.PrivateKey(i), consensusVote, timeTime)
 		require.NoError(t, err)
-		enProto, err := en.Proto()
-		require.NoError(t, err)
-		typesFooter.Endorsements = append(typesFooter.Endorsements, enProto)
+		typesFooter.Endorsements = append(typesFooter.Endorsements, en.Proto())
 	}
 	ts := timestamppb.New(time.Unix(int64(unixTime), 0))
 	typesFooter.Timestamp = ts
diff --git a/endorsement/endorsement.go b/endorsement/endorsement.go
index fcc5f7bdc2..6884a4ccd0 100644
--- a/endorsement/endorsement.go
+++ b/endorsement/endorsement.go
@@ -113,13 +113,13 @@ func (en *Endorsement) Signature() []byte {
 }
 
 // Proto converts an endorsement to protobuf message
-func (en *Endorsement) Proto() (*iotextypes.Endorsement, error) {
+func (en *Endorsement) Proto() *iotextypes.Endorsement {
 	ts := timestamppb.New(en.ts)
 	return &iotextypes.Endorsement{
 		Timestamp: ts,
 		Endorser:  en.endorser.Bytes(),
 		Signature: en.Signature(),
-	}, nil
+	}
 }
 
 // LoadProto converts a protobuf message to endorsement