diff --git a/cmd/harmony/main.go b/cmd/harmony/main.go
index 69a837d1a..5df0c41cc 100644
--- a/cmd/harmony/main.go
+++ b/cmd/harmony/main.go
@@ -505,7 +505,7 @@ func setupNodeAndRun(hc harmonyconfig.HarmonyConfig) {
 	}
 
 	go func() {
-		core.WritePreimagesMetricsIntoPrometheus(currentNode.Blockchain().ChainDb(), currentNode.Consensus.UpdatePreimageGenerationMetrics)
+		core.WritePreimagesMetricsIntoPrometheus(currentNode.Blockchain(), currentNode.Consensus.UpdatePreimageGenerationMetrics)
 	}()
 	go listenOSSigAndShutDown(currentNode)
 
diff --git a/consensus/metrics.go b/consensus/metrics.go
index 9d4dcee0a..4603050de 100644
--- a/consensus/metrics.go
+++ b/consensus/metrics.go
@@ -25,7 +25,14 @@ var (
 			Help:      "the last block for which pre-image generation ran locally",
 		},
 	)
-
+	verifiedPreimagesGauge = prometheus.NewGauge(
+		prometheus.GaugeOpts{
+			Namespace: "hmy",
+			Subsystem: "blockchain",
+			Name:      "verified_preimages",
+			Help:      "the number of verified preimages",
+		},
+	)
 	lastPreimageImportGauge = prometheus.NewGauge(
 		prometheus.GaugeOpts{
 			Namespace: "hmy",
@@ -129,7 +136,7 @@ func (consensus *Consensus) UpdateLeaderMetrics(numCommits float64, blockNum flo
 	consensusCounterVec.With(prometheus.Labels{"consensus": "num_commits"}).Add(numCommits)
 	consensusGaugeVec.With(prometheus.Labels{"consensus": "num_commits"}).Set(numCommits)
 }
-func (consensus *Consensus) UpdatePreimageGenerationMetrics(preimageStart, preimageEnd, lastPreimageImport uint64) {
+func (consensus *Consensus) UpdatePreimageGenerationMetrics(preimageStart, preimageEnd, lastPreimageImport, verifiedAddresses uint64) {
 	if lastPreimageImport > 0 {
 		lastPreimageImportGauge.Set(float64(lastPreimageImport))
 	}
@@ -139,6 +146,9 @@ func (consensus *Consensus) UpdatePreimageGenerationMetrics(preimageStart, preim
 	if preimageEnd > 0 {
 		preimageEndGauge.Set(float64(preimageEnd))
 	}
+	if verifiedAddresses > 0 {
+		verifiedPreimagesGauge.Set(float64(verifiedAddresses))
+	}
 }
 
 // AddPubkeyMetrics add the list of blskeys to prometheus metrics
diff --git a/core/preimages.go b/core/preimages.go
index d99ac351c..57dd59419 100644
--- a/core/preimages.go
+++ b/core/preimages.go
@@ -6,11 +6,11 @@ import (
 	"io"
 	"os"
 	"strconv"
+	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	ethCommon "github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
-	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/harmony-one/harmony/block"
 	"github.com/harmony-one/harmony/core/rawdb"
 	"github.com/harmony-one/harmony/core/state"
@@ -339,10 +339,25 @@ func VerifyPreimages(header *block.Header, chain BlockChain) (uint64, error) {
 	return existingPreimages, nil
 }
 
-func WritePreimagesMetricsIntoPrometheus(dbReader ethdb.Database, sendMetrics func(preimageStart, preimageEnd, lastPreimageImport uint64)) {
-	lastImport, _ := rawdb.ReadPreimageImportBlock(dbReader)
-	startBlock, _ := rawdb.ReadPreImageStartBlock(dbReader)
-	endBlock, _ := rawdb.ReadPreImageEndBlock(dbReader)
+func WritePreimagesMetricsIntoPrometheus(chain BlockChain, sendMetrics func(preimageStart, preimageEnd, lastPreimageImport, verifiedAddresses uint64)) {
+	if chain.ShardID() < 2 {
+		return
+	}
+
+	ticker := time.NewTicker(time.Minute * 5)
+	dbReader := chain.ChainDb()
+
+	for {
+		select {
+		case <-ticker.C:
+			lastImport, _ := rawdb.ReadPreimageImportBlock(dbReader)
+			startBlock, _ := rawdb.ReadPreImageStartBlock(dbReader)
+			endBlock, _ := rawdb.ReadPreImageEndBlock(dbReader)
+
+			chain.CurrentBlock().NumberU64()
+			verify, _ := VerifyPreimages(chain.CurrentBlock().Header(), chain)
 
-	sendMetrics(startBlock, endBlock, lastImport)
+			sendMetrics(startBlock, endBlock, lastImport, verify)
+		}
+	}
 }