diff --git a/utils/util.go b/utils/util.go
index 6f19082e..9771212a 100644
--- a/utils/util.go
+++ b/utils/util.go
@@ -3,6 +3,7 @@ package utils
 import (
 	"context"
 	"errors"
+	"github.com/nervosnetwork/ckb-sdk-go/indexer"
 	"github.com/nervosnetwork/ckb-sdk-go/rpc"
 	"github.com/nervosnetwork/ckb-sdk-go/types"
 	"math/big"
@@ -89,7 +90,7 @@ func getCellbaseMaturity(client rpc.Client, ctx context.Context, cellbaseMaturit
 	if err != nil {
 		return nil, err
 	}
-	major, minor, _, err := ParseNodeVersion(nodeInfo.Version)
+	major, minor, _, err := parseNodeVersion(nodeInfo.Version)
 	if err != nil {
 		return nil, err
 	}
@@ -141,8 +142,7 @@ func isTipEpochLessThanCellbaseMaturity(tipEpochR, cellbaseMaturityR *big.Rat) b
 	return false
 }
 
-// ParseNodeVersion return ckb node version number
-func ParseNodeVersion(nodeVersion string) (int, int, int, error) {
+func parseNodeVersion(nodeVersion string) (int, int, int, error) {
 	reg, err := regexp.Compile("\\d+(\\.\\d+){0,2}")
 	if err != nil {
 		return 0, 0, 0, err
@@ -164,3 +164,8 @@ func ParseNodeVersion(nodeVersion string) (int, int, int, error) {
 	}
 	return major, minor, patch, nil
 }
+
+// IsMature check if a cellbase live cell is mature
+func IsMature(cell *indexer.LiveCell, maxMatureBlockNumber uint64) bool {
+	return cell.TxIndex > 0 || cell.BlockNumber == 0 || cell.BlockNumber <= maxMatureBlockNumber
+}
diff --git a/utils/util_test.go b/utils/util_test.go
index 861abef6..773dc809 100644
--- a/utils/util_test.go
+++ b/utils/util_test.go
@@ -122,7 +122,7 @@ func Test_calcMaxMatureBlockNumber(t *testing.T) {
 	}
 }
 
-func TestParseNodeVersion(t *testing.T) {
+func Test_parseNodeVersion(t *testing.T) {
 	type args struct {
 		nodeVersion string
 	}
@@ -161,19 +161,19 @@ func TestParseNodeVersion(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			got, got1, got2, err := ParseNodeVersion(tt.args.nodeVersion)
+			got, got1, got2, err := parseNodeVersion(tt.args.nodeVersion)
 			if (err != nil) != tt.wantErr {
-				t.Errorf("ParseNodeVersion() error = %v, wantErr %v", err, tt.wantErr)
+				t.Errorf("parseNodeVersion() error = %v, wantErr %v", err, tt.wantErr)
 				return
 			}
 			if got != tt.want {
-				t.Errorf("ParseNodeVersion() got = %v, want %v", got, tt.want)
+				t.Errorf("parseNodeVersion() got = %v, want %v", got, tt.want)
 			}
 			if got1 != tt.want1 {
-				t.Errorf("ParseNodeVersion() got1 = %v, want %v", got1, tt.want1)
+				t.Errorf("parseNodeVersion() got1 = %v, want %v", got1, tt.want1)
 			}
 			if got2 != tt.want2 {
-				t.Errorf("ParseNodeVersion() got2 = %v, want %v", got2, tt.want2)
+				t.Errorf("parseNodeVersion() got2 = %v, want %v", got2, tt.want2)
 			}
 		})
 	}