diff --git a/core/proof_keeper.go b/core/proof_keeper.go
index 4ecff48f61..1bbad5224b 100644
--- a/core/proof_keeper.go
+++ b/core/proof_keeper.go
@@ -114,11 +114,13 @@ func (keeper *proofKeeper) queryProposedProof(kRecord *pathdb.KeepRecord) (*proo
 
 func (keeper *proofKeeper) eventLoop() {
 	var (
-		putKeeperMetaRecordOnce bool
+		putKeeperMetaRecordOnce bool   // default = false
+		ancientInitSequenceID   uint64 // default = 0
 	)
 	for {
 		select {
 		case r := <-keeper.opts.watchStartKeepCh:
+			log.Info("keep proof", "record", r)
 			var (
 				hasTruncatedMeta bool
 				curProofID       uint64
@@ -127,18 +129,17 @@ func (keeper *proofKeeper) eventLoop() {
 			metaList := keeper.getKeeperMetaRecordList()
 			if len(metaList) == 0 {
 				keeper.proofDataDB.Reset()
-				curProofID = 1
+				curProofID = ancientInitSequenceID
 			} else {
 				keeper.truncateProofDataRecordHeadIfNeeded(r.BlockID)
 				latestProofData := keeper.getLatestProofDataRecord()
 				if latestProofData != nil {
 					curProofID = latestProofData.ProofID + 1
 				} else {
-					curProofID = 1
+					curProofID = ancientInitSequenceID
 				}
 			}
 
-			log.Info("keep proof", "record", r)
 			proofRecord, err := keeper.queryProposedProof(r)
 			if err == nil {
 				if hasTruncatedMeta || !putKeeperMetaRecordOnce {
@@ -175,6 +176,7 @@ func (keeper *proofKeeper) getKeeperMetaRecordList() []keeperMetaRecord {
 		}
 		metaList = append(metaList, m)
 	}
+	log.Info("Succeed to get meta list", "list", metaList)
 	return metaList
 }
 
@@ -205,6 +207,7 @@ func (keeper *proofKeeper) truncateKeeperMetaRecordHeadIfNeeded(blockID uint64)
 	if err != nil {
 		log.Crit("Failed to truncate keeper meta head", "err", err)
 	}
+	log.Info("Succeed to truncate keeper meta", "block_id", blockID, "has_truncated", hasTruncated)
 	return hasTruncated
 }
 
@@ -222,9 +225,11 @@ func (keeper *proofKeeper) putKeeperMetaRecord(m *keeperMetaRecord) {
 func (keeper *proofKeeper) truncateProofDataRecordHeadIfNeeded(blockID uint64) {
 	latestProofDataRecord := keeper.getLatestProofDataRecord()
 	if latestProofDataRecord == nil {
+		log.Info("Skip to truncate proof data due to proof data is empty")
 		return
 	}
 	if blockID > latestProofDataRecord.BlockID {
+		log.Info("Skip to truncate proof data due to block id is newer")
 		return
 	}
 
@@ -243,11 +248,13 @@ func (keeper *proofKeeper) truncateProofDataRecordHeadIfNeeded(blockID uint64) {
 		proofID = proofID - 1
 	}
 	rawdb.TruncateProofDataHead(keeper.proofDataDB, truncateProofID)
+	log.Info("Succeed to truncate proof data", "block_id", blockID, "truncate_proof_id", truncateProofID)
 }
 
 func (keeper *proofKeeper) getLatestProofDataRecord() *proofDataRecord {
 	latestProofData := rawdb.GetLatestProofData(keeper.proofDataDB)
 	if latestProofData == nil {
+		log.Info("Skip get latest proof data record due to empty")
 		return nil
 	}
 	var data proofDataRecord
@@ -255,12 +262,14 @@ func (keeper *proofKeeper) getLatestProofDataRecord() *proofDataRecord {
 	if err != nil {
 		log.Crit("Failed to unmarshal proof data", "err", err)
 	}
+	log.Info("Succeed to get latest proof data", "record", data)
 	return &data
 }
 
 func (keeper *proofKeeper) getProofDataRecord(proofID uint64) *proofDataRecord {
 	latestProofData := rawdb.GetProofData(keeper.proofDataDB, proofID)
 	if latestProofData == nil {
+		log.Info("Skip get proof data record due not found", "proof_id", proofID)
 		return nil
 	}
 	var data proofDataRecord
@@ -268,6 +277,7 @@ func (keeper *proofKeeper) getProofDataRecord(proofID uint64) *proofDataRecord {
 	if err != nil {
 		log.Crit("Failed to unmarshal proof data", "err", err)
 	}
+	log.Info("Succeed to get proof data", "record", data)
 	return &data
 }
 
diff --git a/core/rawdb/accessors_proof.go b/core/rawdb/accessors_proof.go
index 114e3dba17..bbe47f63a8 100644
--- a/core/rawdb/accessors_proof.go
+++ b/core/rawdb/accessors_proof.go
@@ -6,7 +6,7 @@ import (
 )
 
 const (
-	blockNumberLength = 32
+	blockNumberLength = 8 // uint64 is 8bytes
 )
 
 // Keeper Meta
@@ -33,8 +33,9 @@ func GetLatestProofData(f *ResettableFreezer) []byte {
 	if proofTable == nil {
 		return nil
 	}
-	blob, err := f.Ancient(proposeProofTable, proofTable.items.Load())
+	blob, err := f.Ancient(proposeProofTable, proofTable.items.Load()-1)
 	if err != nil {
+		log.Error("Failed to get latest proof data", "latest_proof_id", proofTable.items.Load()-1, "error", err)
 		return nil
 	}
 	return blob
@@ -56,9 +57,13 @@ func TruncateProofDataHead(f *ResettableFreezer, proofID uint64) {
 	f.freezer.TruncateHead(proofID)
 }
 
-func PutProofData(db ethdb.AncientWriter, id uint64, proof []byte) {
+func PutProofData(db ethdb.AncientWriter, proofID uint64, proof []byte) {
 	db.ModifyAncients(func(op ethdb.AncientWriteOp) error {
-		op.AppendRaw(proposeProofTable, id-1, proof)
+		err := op.AppendRaw(proposeProofTable, proofID, proof)
+		if err != nil {
+			// todo: panic
+			log.Error("Failed to put proof data", "proof_id", proofID, "error", err)
+		}
 		return nil
 	})
 }
diff --git a/core/rawdb/accessors_proof_test.go b/core/rawdb/accessors_proof_test.go
new file mode 100644
index 0000000000..04d8429483
--- /dev/null
+++ b/core/rawdb/accessors_proof_test.go
@@ -0,0 +1,71 @@
+package rawdb
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+const (
+	testAncientProofDir = "./test_ancient_proof"
+)
+
+var (
+	testAncientProofDB *ResettableFreezer
+	mockData1          = []byte{'a'}
+	mockData2          = []byte{'1'}
+)
+
+func setupTestEnv() {
+	testAncientProofDB, _ = NewProofFreezer(testAncientProofDir, false)
+}
+
+func cleanupTestEnv() {
+	testAncientProofDB.Close()
+	os.RemoveAll(testAncientProofDir)
+
+}
+
+func TestProofDataAPI(t *testing.T) {
+	setupTestEnv()
+	var proofData []byte
+
+	// case1: empty db
+	proofData = GetLatestProofData(testAncientProofDB)
+	assert.Nil(t, proofData)
+
+	// case2: mismatch sequence put failed
+	mismatchProofID := uint64(2) // should=0
+	PutProofData(testAncientProofDB, mismatchProofID, mockData1)
+	proofData = GetLatestProofData(testAncientProofDB)
+	assert.Nil(t, proofData)
+
+	// case3: put/get succeed
+	matchProofID := uint64(0)
+	PutProofData(testAncientProofDB, matchProofID, mockData1)
+	PutProofData(testAncientProofDB, matchProofID+1, mockData2)
+	proofData = GetLatestProofData(testAncientProofDB)
+	assert.Equal(t, proofData, mockData2)
+	proofData = GetProofData(testAncientProofDB, 0)
+	assert.Equal(t, proofData, mockData1)
+	proofData = GetProofData(testAncientProofDB, 1)
+	assert.Equal(t, proofData, mockData2)
+
+	// case4: truncate
+	TruncateProofDataHead(testAncientProofDB, 1)
+	proofData = GetProofData(testAncientProofDB, 1)
+	assert.Nil(t, proofData)
+	proofData = GetProofData(testAncientProofDB, 0)
+	assert.Equal(t, proofData, mockData1)
+
+	// case5: restart
+	testAncientProofDB.Close()
+	setupTestEnv()
+	proofData = GetProofData(testAncientProofDB, 0)
+	assert.Equal(t, proofData, mockData1)
+	proofData = GetLatestProofData(testAncientProofDB)
+	assert.Equal(t, proofData, mockData1)
+
+	cleanupTestEnv()
+}