diff --git a/CHANGELOG_PENDING.md b/CHANGELOG_PENDING.md
index 5a7b024cf..9c3add9b8 100644
--- a/CHANGELOG_PENDING.md
+++ b/CHANGELOG_PENDING.md
@@ -99,6 +99,7 @@ Friendly reminder: We have a [bug bounty program](https://hackerone.com/tendermi
   - Transactions are gossiped in FIFO order as they are in `v0`.
 - [config/indexer] \#6411 Introduce support for custom event indexing data sources, specifically PostgreSQL. (@JayT106)
 - [fastsync/event] \#6619 Emit fastsync status event when switching consensus/fastsync (@JayT106)
+- [statesync/event] \#6700 Emit statesync status start/end event (@JayT106)
 
 ### IMPROVEMENTS
 - [libs/log] Console log formatting changes as a result of \#6534 and \#6589. (@tychoish)
diff --git a/docs/tendermint-core/state-sync.md b/docs/tendermint-core/state-sync.md
index 38bf8bf33..623de4953 100644
--- a/docs/tendermint-core/state-sync.md
+++ b/docs/tendermint-core/state-sync.md
@@ -9,3 +9,10 @@ With state sync your node will download data related to the head or near the hea
 This leads to drastically shorter times for joining a network. 
 
 Information on how to configure state sync is located in the [nodes section](../nodes/state-sync.md)
+
+## Events
+
+When a node starts with the statesync flag enabled in the config file, it will emit two events: one upon starting statesync and the other upon completion.
+
+The user can query the events by subscribing `EventQueryStateSyncStatus`
+Please check [types](https://pkg.go.dev/github.com/tendermint/tendermint/types?utm_source=godoc#pkg-constants) for the details.
\ No newline at end of file
diff --git a/internal/consensus/mocks/cons_sync_reactor.go b/internal/consensus/mocks/cons_sync_reactor.go
new file mode 100644
index 000000000..fcaa5696d
--- /dev/null
+++ b/internal/consensus/mocks/cons_sync_reactor.go
@@ -0,0 +1,28 @@
+// Code generated by mockery 2.7.5. DO NOT EDIT.
+
+package mocks
+
+import (
+	mock "github.com/stretchr/testify/mock"
+	state "github.com/tendermint/tendermint/state"
+)
+
+// ConsSyncReactor is an autogenerated mock type for the ConsSyncReactor type
+type ConsSyncReactor struct {
+	mock.Mock
+}
+
+// SetFastSyncingMetrics provides a mock function with given fields: _a0
+func (_m *ConsSyncReactor) SetFastSyncingMetrics(_a0 float64) {
+	_m.Called(_a0)
+}
+
+// SetStateSyncingMetrics provides a mock function with given fields: _a0
+func (_m *ConsSyncReactor) SetStateSyncingMetrics(_a0 float64) {
+	_m.Called(_a0)
+}
+
+// SwitchToConsensus provides a mock function with given fields: _a0, _a1
+func (_m *ConsSyncReactor) SwitchToConsensus(_a0 state.State, _a1 bool) {
+	_m.Called(_a0, _a1)
+}
diff --git a/internal/consensus/mocks/fast_sync_reactor.go b/internal/consensus/mocks/fast_sync_reactor.go
new file mode 100644
index 000000000..f6a7fabbc
--- /dev/null
+++ b/internal/consensus/mocks/fast_sync_reactor.go
@@ -0,0 +1,71 @@
+// Code generated by mockery 2.7.5. DO NOT EDIT.
+
+package mocks
+
+import (
+	mock "github.com/stretchr/testify/mock"
+	state "github.com/tendermint/tendermint/state"
+
+	time "time"
+)
+
+// FastSyncReactor is an autogenerated mock type for the FastSyncReactor type
+type FastSyncReactor struct {
+	mock.Mock
+}
+
+// GetMaxPeerBlockHeight provides a mock function with given fields:
+func (_m *FastSyncReactor) GetMaxPeerBlockHeight() int64 {
+	ret := _m.Called()
+
+	var r0 int64
+	if rf, ok := ret.Get(0).(func() int64); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Get(0).(int64)
+	}
+
+	return r0
+}
+
+// GetRemainingSyncTime provides a mock function with given fields:
+func (_m *FastSyncReactor) GetRemainingSyncTime() time.Duration {
+	ret := _m.Called()
+
+	var r0 time.Duration
+	if rf, ok := ret.Get(0).(func() time.Duration); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Get(0).(time.Duration)
+	}
+
+	return r0
+}
+
+// GetTotalSyncedTime provides a mock function with given fields:
+func (_m *FastSyncReactor) GetTotalSyncedTime() time.Duration {
+	ret := _m.Called()
+
+	var r0 time.Duration
+	if rf, ok := ret.Get(0).(func() time.Duration); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Get(0).(time.Duration)
+	}
+
+	return r0
+}
+
+// SwitchToFastSync provides a mock function with given fields: _a0
+func (_m *FastSyncReactor) SwitchToFastSync(_a0 state.State) error {
+	ret := _m.Called(_a0)
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(state.State) error); ok {
+		r0 = rf(_a0)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
diff --git a/internal/consensus/reactor.go b/internal/consensus/reactor.go
index 1e5399f52..e01a6f329 100644
--- a/internal/consensus/reactor.go
+++ b/internal/consensus/reactor.go
@@ -112,6 +112,14 @@ type FastSyncReactor interface {
 	GetRemainingSyncTime() time.Duration
 }
 
+//go:generate mockery --case underscore --name ConsSyncReactor
+// ConsSyncReactor defines an interface used for testing abilities of node.startStateSync.
+type ConsSyncReactor interface {
+	SwitchToConsensus(sm.State, bool)
+	SetStateSyncingMetrics(float64)
+	SetFastSyncingMetrics(float64)
+}
+
 // Reactor defines a reactor for the consensus service.
 type Reactor struct {
 	service.BaseService
@@ -1429,3 +1437,11 @@ func (r *Reactor) peerStatsRoutine() {
 func (r *Reactor) GetConsensusState() *State {
 	return r.state
 }
+
+func (r *Reactor) SetStateSyncingMetrics(v float64) {
+	r.Metrics.StateSyncing.Set(v)
+}
+
+func (r *Reactor) SetFastSyncingMetrics(v float64) {
+	r.Metrics.FastSyncing.Set(v)
+}
diff --git a/internal/statesync/mock_sync_reactor.go b/internal/statesync/mock_sync_reactor.go
new file mode 100644
index 000000000..6688ce4d2
--- /dev/null
+++ b/internal/statesync/mock_sync_reactor.go
@@ -0,0 +1,50 @@
+package statesync
+
+import (
+	"context"
+	"time"
+
+	mock "github.com/stretchr/testify/mock"
+	state "github.com/tendermint/tendermint/state"
+)
+
+// MockSyncReactor is an autogenerated mock type for the SyncReactor type.
+// Because of the stateprovider uses in Sync(), we use package statesync instead of mocks.
+type MockSyncReactor struct {
+	mock.Mock
+}
+
+// Backfill provides a mock function with given fields: _a0
+func (_m *MockSyncReactor) Backfill(_a0 state.State) error {
+	ret := _m.Called(_a0)
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(state.State) error); ok {
+		r0 = rf(_a0)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// Sync provides a mock function with given fields: _a0, _a1, _a2
+func (_m *MockSyncReactor) Sync(_a0 context.Context, _a1 StateProvider, _a2 time.Duration) (state.State, error) {
+	ret := _m.Called(_a0, _a1, _a2)
+
+	var r0 state.State
+	if rf, ok := ret.Get(0).(func(context.Context, StateProvider, time.Duration) state.State); ok {
+		r0 = rf(_a0, _a1, _a2)
+	} else {
+		r0 = ret.Get(0).(state.State)
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, StateProvider, time.Duration) error); ok {
+		r1 = rf(_a0, _a1, _a2)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
diff --git a/internal/statesync/reactor.go b/internal/statesync/reactor.go
index 3921e477e..59cbabd14 100644
--- a/internal/statesync/reactor.go
+++ b/internal/statesync/reactor.go
@@ -102,6 +102,12 @@ const (
 	maxLightBlockRequestRetries = 20
 )
 
+// SyncReactor defines an interface used for testing abilities of node.startStateSync.
+type SyncReactor interface {
+	Sync(context.Context, StateProvider, time.Duration) (sm.State, error)
+	Backfill(sm.State) error
+}
+
 // Reactor handles state sync, both restoring snapshots for the local node and
 // serving snapshots for other nodes.
 type Reactor struct {
@@ -222,6 +228,11 @@ func (r *Reactor) Sync(
 		return sm.State{}, errors.New("a state sync is already in progress")
 	}
 
+	if stateProvider == nil {
+		r.mtx.Unlock()
+		return sm.State{}, errors.New("the stateProvider should not be nil when doing the state sync")
+	}
+
 	r.syncer = newSyncer(
 		r.cfg,
 		r.Logger,
diff --git a/node/node.go b/node/node.go
index 2d994b189..cb32c5ce6 100644
--- a/node/node.go
+++ b/node/node.go
@@ -63,26 +63,25 @@ type nodeImpl struct {
 	isListening bool
 
 	// services
-	eventBus          *types.EventBus // pub/sub for services
-	stateStore        sm.Store
-	blockStore        *store.BlockStore // store the blockchain to disk
-	bcReactor         service.Service   // for fast-syncing
-	mempoolReactor    service.Service   // for gossipping transactions
-	mempool           mempool.Mempool
-	stateSync         bool                    // whether the node should state sync on startup
-	stateSyncReactor  *statesync.Reactor      // for hosting and restoring state sync snapshots
-	stateSyncProvider statesync.StateProvider // provides state data for bootstrapping a node
-	consensusState    *cs.State               // latest consensus state
-	consensusReactor  *cs.Reactor             // for participating in the consensus
-	pexReactor        *pex.Reactor            // for exchanging peer addresses
-	pexReactorV2      *pex.ReactorV2          // for exchanging peer addresses
-	evidenceReactor   *evidence.Reactor
-	evidencePool      *evidence.Pool // tracking evidence
-	proxyApp          proxy.AppConns // connection to the application
-	rpcListeners      []net.Listener // rpc servers
-	eventSinks        []indexer.EventSink
-	indexerService    *indexer.Service
-	prometheusSrv     *http.Server
+	eventBus         *types.EventBus // pub/sub for services
+	stateStore       sm.Store
+	blockStore       *store.BlockStore // store the blockchain to disk
+	bcReactor        service.Service   // for fast-syncing
+	mempoolReactor   service.Service   // for gossipping transactions
+	mempool          mempool.Mempool
+	stateSync        bool               // whether the node should state sync on startup
+	stateSyncReactor *statesync.Reactor // for hosting and restoring state sync snapshots
+	consensusState   *cs.State          // latest consensus state
+	consensusReactor *cs.Reactor        // for participating in the consensus
+	pexReactor       *pex.Reactor       // for exchanging peer addresses
+	pexReactorV2     *pex.ReactorV2     // for exchanging peer addresses
+	evidenceReactor  *evidence.Reactor
+	evidencePool     *evidence.Pool // tracking evidence
+	proxyApp         proxy.AppConns // connection to the application
+	rpcListeners     []net.Listener // rpc servers
+	eventSinks       []indexer.EventSink
+	indexerService   *indexer.Service
+	prometheusSrv    *http.Server
 }
 
 // newDefaultNode returns a Tendermint node with default settings for the
@@ -663,9 +662,15 @@ func (n *nodeImpl) OnStart() error {
 			return fmt.Errorf("unable to derive state: %w", err)
 		}
 
-		err = startStateSync(n.stateSyncReactor, bcR, n.consensusReactor, n.stateSyncProvider,
-			n.config.StateSync, n.config.FastSyncMode, n.stateStore, n.blockStore, state, n.eventBus)
+		ssc := n.config.StateSync
+		sp, err := constructStateProvider(ssc, state, n.Logger.With("module", "light"))
+
 		if err != nil {
+			return fmt.Errorf("failed to set up light client state provider: %w", err)
+		}
+
+		if err := startStateSync(n.stateSyncReactor, bcR, n.consensusReactor, sp,
+			ssc, n.config.FastSyncMode, state.InitialHeight, n.eventBus); err != nil {
 			return fmt.Errorf("failed to start state sync: %w", err)
 		}
 	}
@@ -1027,54 +1032,57 @@ func (n *nodeImpl) NodeInfo() types.NodeInfo {
 }
 
 // startStateSync starts an asynchronous state sync process, then switches to fast sync mode.
-func startStateSync(ssR *statesync.Reactor, bcR cs.FastSyncReactor, conR *cs.Reactor,
-	stateProvider statesync.StateProvider, config *cfg.StateSyncConfig, fastSync bool,
-	stateStore sm.Store, blockStore *store.BlockStore, state sm.State, eventbus *types.EventBus) error {
-	ssR.Logger.Info("starting state sync...")
-
-	if stateProvider == nil {
-		var err error
-		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-		defer cancel()
-		stateProvider, err = statesync.NewLightClientStateProvider(
-			ctx,
-			state.ChainID, state.Version, state.InitialHeight,
-			config.RPCServers, light.TrustOptions{
-				Period: config.TrustPeriod,
-				Height: config.TrustHeight,
-				Hash:   config.TrustHashBytes(),
-			}, ssR.Logger.With("module", "light"))
-		if err != nil {
-			return fmt.Errorf("failed to set up light client state provider: %w", err)
-		}
+func startStateSync(
+	ssR statesync.SyncReactor,
+	bcR cs.FastSyncReactor,
+	conR cs.ConsSyncReactor,
+	sp statesync.StateProvider,
+	config *cfg.StateSyncConfig,
+	fastSync bool,
+	stateInitHeight int64,
+	eb *types.EventBus,
+) error {
+	stateSyncLogger := eb.Logger.With("module", "statesync")
+
+	stateSyncLogger.Info("starting state sync...")
+
+	// at the beginning of the statesync start, we use the initialHeight as the event height
+	// because of the statesync doesn't have the concreate state height before fetched the snapshot.
+	d := types.EventDataStateSyncStatus{Complete: false, Height: stateInitHeight}
+	if err := eb.PublishEventStateSyncStatus(d); err != nil {
+		stateSyncLogger.Error("failed to emit the statesync start event", "err", err)
 	}
 
 	go func() {
-		state, err := ssR.Sync(context.TODO(), stateProvider, config.DiscoveryTime)
+		state, err := ssR.Sync(context.TODO(), sp, config.DiscoveryTime)
 		if err != nil {
-			ssR.Logger.Error("state sync failed", "err", err)
+			stateSyncLogger.Error("state sync failed", "err", err)
 			return
 		}
 
-		err = ssR.Backfill(state)
-		if err != nil {
-			ssR.Logger.Error("backfill failed; node has insufficient history to verify all evidence;"+
+		if err := ssR.Backfill(state); err != nil {
+			stateSyncLogger.Error("backfill failed; node has insufficient history to verify all evidence;"+
 				" proceeding optimistically...", "err", err)
 		}
 
-		conR.Metrics.StateSyncing.Set(0)
+		conR.SetStateSyncingMetrics(0)
+
+		d := types.EventDataStateSyncStatus{Complete: true, Height: state.LastBlockHeight}
+		if err := eb.PublishEventStateSyncStatus(d); err != nil {
+			stateSyncLogger.Error("failed to emit the statesync start event", "err", err)
+		}
+
 		if fastSync {
 			// FIXME Very ugly to have these metrics bleed through here.
-			conR.Metrics.FastSyncing.Set(1)
-			err = bcR.SwitchToFastSync(state)
-			if err != nil {
-				ssR.Logger.Error("failed to switch to fast sync", "err", err)
+			conR.SetFastSyncingMetrics(1)
+			if err := bcR.SwitchToFastSync(state); err != nil {
+				stateSyncLogger.Error("failed to switch to fast sync", "err", err)
 				return
 			}
 
 			d := types.EventDataFastSyncStatus{Complete: false, Height: state.LastBlockHeight}
-			if err := eventbus.PublishEventFastSyncStatus(d); err != nil {
-				ssR.Logger.Error("failed to emit the fastsync starting event", "err", err)
+			if err := eb.PublishEventFastSyncStatus(d); err != nil {
+				stateSyncLogger.Error("failed to emit the fastsync starting event", "err", err)
 			}
 
 		} else {
@@ -1266,3 +1274,24 @@ func getChannelsFromShim(reactorShim *p2p.ReactorShim) map[p2p.ChannelID]*p2p.Ch
 
 	return channels
 }
+
+func constructStateProvider(
+	ssc *cfg.StateSyncConfig,
+	state sm.State,
+	logger log.Logger,
+) (statesync.StateProvider, error) {
+	ctx, cancel := context.WithTimeout(context.TODO(), 10*time.Second)
+	defer cancel()
+
+	to := light.TrustOptions{
+		Period: ssc.TrustPeriod,
+		Height: ssc.TrustHeight,
+		Hash:   ssc.TrustHashBytes(),
+	}
+
+	return statesync.NewLightClientStateProvider(
+		ctx,
+		state.ChainID, state.Version, state.InitialHeight,
+		ssc.RPCServers, to, logger,
+	)
+}
diff --git a/node/node_test.go b/node/node_test.go
index d619d22d9..eca622bd3 100644
--- a/node/node_test.go
+++ b/node/node_test.go
@@ -21,11 +21,16 @@ import (
 	"github.com/tendermint/tendermint/crypto"
 	"github.com/tendermint/tendermint/crypto/ed25519"
 	"github.com/tendermint/tendermint/crypto/tmhash"
+	consmocks "github.com/tendermint/tendermint/internal/consensus/mocks"
+	ssmocks "github.com/tendermint/tendermint/internal/statesync/mocks"
+
 	"github.com/tendermint/tendermint/internal/evidence"
 	"github.com/tendermint/tendermint/internal/mempool"
 	mempoolv0 "github.com/tendermint/tendermint/internal/mempool/v0"
+	statesync "github.com/tendermint/tendermint/internal/statesync"
 	"github.com/tendermint/tendermint/internal/test/factory"
 	"github.com/tendermint/tendermint/libs/log"
+	tmpubsub "github.com/tendermint/tendermint/libs/pubsub"
 	tmrand "github.com/tendermint/tendermint/libs/rand"
 	tmtime "github.com/tendermint/tendermint/libs/time"
 	"github.com/tendermint/tendermint/privval"
@@ -626,6 +631,12 @@ func state(nVals int, height int64) (sm.State, dbm.DB, []types.PrivValidator) {
 }
 
 func TestLoadStateFromGenesis(t *testing.T) {
+	_ = loadStatefromGenesis(t)
+}
+
+func loadStatefromGenesis(t *testing.T) sm.State {
+	t.Helper()
+
 	stateDB := dbm.NewMemDB()
 	stateStore := sm.NewStore(stateDB)
 	config := cfg.ResetTestRoot("load_state_from_genesis")
@@ -642,4 +653,68 @@ func TestLoadStateFromGenesis(t *testing.T) {
 	)
 	require.NoError(t, err)
 	require.NotNil(t, state)
+
+	return state
+}
+
+func TestNodeStartStateSync(t *testing.T) {
+	mockSSR := &statesync.MockSyncReactor{}
+	mockFSR := &consmocks.FastSyncReactor{}
+	mockCSR := &consmocks.ConsSyncReactor{}
+	mockSP := &ssmocks.StateProvider{}
+	state := loadStatefromGenesis(t)
+	config := cfg.ResetTestRoot("load_state_from_genesis")
+
+	eventBus, err := createAndStartEventBus(log.TestingLogger())
+	defer func() {
+		err := eventBus.Stop()
+		require.NoError(t, err)
+	}()
+
+	require.NoError(t, err)
+	require.NotNil(t, eventBus)
+
+	sub, err := eventBus.Subscribe(context.Background(), "test-client", types.EventQueryStateSyncStatus, 10)
+	require.NoError(t, err)
+	require.NotNil(t, sub)
+
+	cfgSS := config.StateSync
+
+	mockSSR.On("Sync", context.TODO(), mockSP, cfgSS.DiscoveryTime).Return(state, nil).
+		On("Backfill", state).Return(nil)
+	mockCSR.On("SetStateSyncingMetrics", float64(0)).Return().
+		On("SwitchToConsensus", state, true).Return()
+
+	require.NoError(t,
+		startStateSync(mockSSR, mockFSR, mockCSR, mockSP, config.StateSync, false, state.InitialHeight, eventBus))
+
+	for cnt := 0; cnt < 2; {
+		select {
+		case <-time.After(3 * time.Second):
+			t.Errorf("StateSyncStatus timeout")
+		case msg := <-sub.Out():
+			if cnt == 0 {
+				ensureStateSyncStatus(t, msg, false, state.InitialHeight)
+				cnt++
+			} else {
+				// the state height = 0 because we are not actually update the state in this test
+				ensureStateSyncStatus(t, msg, true, 0)
+				cnt++
+			}
+		}
+	}
+
+	mockSSR.AssertNumberOfCalls(t, "Sync", 1)
+	mockSSR.AssertNumberOfCalls(t, "Backfill", 1)
+	mockCSR.AssertNumberOfCalls(t, "SetStateSyncingMetrics", 1)
+	mockCSR.AssertNumberOfCalls(t, "SwitchToConsensus", 1)
+}
+
+func ensureStateSyncStatus(t *testing.T, msg tmpubsub.Message, complete bool, height int64) {
+	t.Helper()
+	status, ok := msg.Data().(types.EventDataStateSyncStatus)
+
+	require.True(t, ok)
+	require.Equal(t, complete, status.Complete)
+	require.Equal(t, height, status.Height)
 }
diff --git a/types/event_bus.go b/types/event_bus.go
index e3a530d2e..5290181ee 100644
--- a/types/event_bus.go
+++ b/types/event_bus.go
@@ -157,6 +157,10 @@ func (b *EventBus) PublishEventFastSyncStatus(data EventDataFastSyncStatus) erro
 	return b.Publish(EventFastSyncStatusValue, data)
 }
 
+func (b *EventBus) PublishEventStateSyncStatus(data EventDataStateSyncStatus) error {
+	return b.Publish(EventStateSyncStatusValue, data)
+}
+
 // PublishEventTx publishes tx event with events from Result. Note it will add
 // predefined keys (EventTypeKey, TxHashKey). Existing events with the same keys
 // will be overwritten.
@@ -316,3 +320,7 @@ func (NopEventBus) PublishEventValidatorSetUpdates(data EventDataValidatorSetUpd
 func (NopEventBus) PublishEventFastSyncStatus(data EventDataFastSyncStatus) error {
 	return nil
 }
+
+func (NopEventBus) PublishEventStateSyncStatus(data EventDataStateSyncStatus) error {
+	return nil
+}
diff --git a/types/event_bus_test.go b/types/event_bus_test.go
index 0ea51cdfe..987a10eab 100644
--- a/types/event_bus_test.go
+++ b/types/event_bus_test.go
@@ -372,6 +372,8 @@ func TestEventBusPublish(t *testing.T) {
 	require.NoError(t, err)
 	err = eventBus.PublishEventFastSyncStatus(EventDataFastSyncStatus{})
 	require.NoError(t, err)
+	err = eventBus.PublishEventStateSyncStatus(EventDataStateSyncStatus{})
+	require.NoError(t, err)
 
 	select {
 	case <-done:
@@ -479,6 +481,7 @@ var events = []string{
 	EventTimeoutWaitValue,
 	EventVoteValue,
 	EventFastSyncStatusValue,
+	EventStateSyncStatusValue,
 }
 
 func randEventValue() string {
diff --git a/types/events.go b/types/events.go
index 326a1610d..2e234d3b7 100644
--- a/types/events.go
+++ b/types/events.go
@@ -29,17 +29,18 @@ const (
 	EventCompleteProposalValue = "CompleteProposal"
 	// The FastSyncStatus event will be emitted when the node switching
 	// state sync mechanism between the consensus reactor and the fastsync reactor.
-	EventFastSyncStatusValue = "FastSyncStatus"
-	EventLockValue           = "Lock"
-	EventNewRoundValue       = "NewRound"
-	EventNewRoundStepValue   = "NewRoundStep"
-	EventPolkaValue          = "Polka"
-	EventRelockValue         = "Relock"
-	EventTimeoutProposeValue = "TimeoutPropose"
-	EventTimeoutWaitValue    = "TimeoutWait"
-	EventUnlockValue         = "Unlock"
-	EventValidBlockValue     = "ValidBlock"
-	EventVoteValue           = "Vote"
+	EventFastSyncStatusValue  = "FastSyncStatus"
+	EventLockValue            = "Lock"
+	EventNewRoundValue        = "NewRound"
+	EventNewRoundStepValue    = "NewRoundStep"
+	EventPolkaValue           = "Polka"
+	EventRelockValue          = "Relock"
+	EventStateSyncStatusValue = "StateSyncStatus"
+	EventTimeoutProposeValue  = "TimeoutPropose"
+	EventTimeoutWaitValue     = "TimeoutWait"
+	EventUnlockValue          = "Unlock"
+	EventValidBlockValue      = "ValidBlock"
+	EventVoteValue            = "Vote"
 )
 
 // Pre-populated ABCI Tendermint-reserved events
@@ -104,6 +105,7 @@ func init() {
 	tmjson.RegisterType(EventDataValidatorSetUpdates{}, "tendermint/event/ValidatorSetUpdates")
 	tmjson.RegisterType(EventDataString(""), "tendermint/event/ProposalString")
 	tmjson.RegisterType(EventDataFastSyncStatus{}, "tendermint/event/FastSyncStatus")
+	tmjson.RegisterType(EventDataStateSyncStatus{}, "tendermint/event/StateSyncStatus")
 }
 
 // Most event messages are basic types (a block, a transaction)
@@ -181,6 +183,13 @@ type EventDataFastSyncStatus struct {
 	Height   int64 `json:"height"`
 }
 
+// EventDataStateSyncStatus shows the statesync status and the
+// height when the node state sync mechanism changes.
+type EventDataStateSyncStatus struct {
+	Complete bool  `json:"complete"`
+	Height   int64 `json:"height"`
+}
+
 // PUBSUB
 
 const (
@@ -219,6 +228,7 @@ var (
 	EventQueryValidBlock          = QueryForEvent(EventValidBlockValue)
 	EventQueryVote                = QueryForEvent(EventVoteValue)
 	EventQueryFastSyncStatus      = QueryForEvent(EventFastSyncStatusValue)
+	EventQueryStateSyncStatus     = QueryForEvent(EventStateSyncStatusValue)
 )
 
 func EventQueryTxFor(tx Tx) tmpubsub.Query {