diff --git a/cmd/XDC/main.go b/cmd/XDC/main.go
index d957f69906..6b8b8d1c02 100644
--- a/cmd/XDC/main.go
+++ b/cmd/XDC/main.go
@@ -28,8 +28,9 @@ import (
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/cmd/utils"
-	
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/console"
+	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/ethclient"
 	"github.com/ethereum/go-ethereum/internal/debug"
@@ -46,7 +47,8 @@ const (
 var (
 	// Git SHA1 commit hash of the release (set via linker flags)
 	gitCommit = ""
-	
+	// Ethereum address of the Geth release oracle.
+	relOracle = common.HexToAddress("0xfa7b9770ca4cb04296cac84f37736d4041251cdf")
 	// The app that holds all commands and flags.
 	app = utils.NewApp(gitCommit, "the go-ethereum command line interface")
 	// flags that configure the node
@@ -289,7 +291,6 @@ func startNode(ctx *cli.Context, stack *node.Node) {
 		if err := stack.Service(&ethereum); err != nil {
 			utils.Fatalf("Ethereum service not running: %v", err)
 		}
-
 		go func() {
 			started := false
 			ok, err := ethereum.ValidateMiner()
@@ -315,40 +316,39 @@ func startNode(ctx *cli.Context, stack *node.Node) {
 				started = true
 				log.Info("Enabled mining node!!!")
 			}
+			defer close(core.Checkpoint)
 
-			for {
-				if ethereum.Checkpoint() {
-					//Checkpoint!!! It's time to reconcile node's state...
-					ok, err := ethereum.ValidateMiner()
-					if err != nil {
-						utils.Fatalf("Can't verify validator permission: %v", err)
+			for range core.Checkpoint {
+				log.Info("Checkpoint!!! It's time to reconcile node's state...")
+				ok, err := ethereum.ValidateMiner()
+				if err != nil {
+					utils.Fatalf("Can't verify validator permission: %v", err)
+				}
+				if !ok {
+					log.Info("Only validator can mine blocks. Cancelling mining on this node...")
+					if started {
+						ethereum.StopMining()
+						started = false
 					}
-					if !ok {
-						log.Info("Only validator can mine blocks. Cancelling mining on this node...")
-						if started {
-							ethereum.StopMining()
-							started = false
+					log.Info("Cancelled mining mode!!!")
+				} else if !started {
+					log.Info("Validator found. Enabling mining mode...")
+					// Use a reduced number of threads if requested
+					if threads := ctx.GlobalInt(utils.MinerThreadsFlag.Name); threads > 0 {
+						type threaded interface {
+							SetThreads(threads int)
 						}
-						log.Info("Cancelled mining mode!!!")
-					} else if !started {
-						log.Info("Validator found. Enabling mining mode...")
-						// Use a reduced number of threads if requested
-						if threads := ctx.GlobalInt(utils.MinerThreadsFlag.Name); threads > 0 {
-							type threaded interface {
-								SetThreads(threads int)
-							}
-							if th, ok := ethereum.Engine().(threaded); ok {
-								th.SetThreads(threads)
-							}
+						if th, ok := ethereum.Engine().(threaded); ok {
+							th.SetThreads(threads)
 						}
-						// Set the gas price to the limits from the CLI and start mining
-						ethereum.TxPool().SetGasPrice(utils.GlobalBig(ctx, utils.GasPriceFlag.Name))
-						if err := ethereum.StartMining(true); err != nil {
-							utils.Fatalf("Failed to start mining: %v", err)
-						}
-						started = true
-						log.Info("Enabled mining node!!!")
 					}
+					// Set the gas price to the limits from the CLI and start mining
+					ethereum.TxPool().SetGasPrice(utils.GlobalBig(ctx, utils.GasPriceFlag.Name))
+					if err := ethereum.StartMining(true); err != nil {
+						utils.Fatalf("Failed to start mining: %v", err)
+					}
+					started = true
+					log.Info("Enabled mining node!!!")
 				}
 			}
 		}()