diff --git a/beacon-chain/casper/incentives_test.go b/beacon-chain/casper/incentives_test.go
index 97f9c12207..b43a59689a 100644
--- a/beacon-chain/casper/incentives_test.go
+++ b/beacon-chain/casper/incentives_test.go
@@ -31,10 +31,10 @@ func TestComputeValidatorRewardsAndPenalties(t *testing.T) {
 	timeSinceFinality := uint64(5)
 
 	data := &pb.CrystallizedState{
-		Validators:        validators,
-		Dynasty:           1,
-		LastJustifiedSlot: 4,
-		LastFinalizedSlot: 3,
+		Validators:             validators,
+		ValidatorSetChangeSlot: 1,
+		LastJustifiedSlot:      4,
+		LastFinalizedSlot:      3,
 	}
 
 	rewardedValidators := CalculateRewards(
diff --git a/beacon-chain/casper/validator.go b/beacon-chain/casper/validator.go
index 8d6c2621ba..14971f80d0 100644
--- a/beacon-chain/casper/validator.go
+++ b/beacon-chain/casper/validator.go
@@ -11,7 +11,7 @@ import (
 
 const bitsInByte = 8
 
-// ActiveValidatorIndices filters out active validators based on start and end dynasty
+// ActiveValidatorIndices filters out active validators based on validator status
 // and returns their indices in a list.
 func ActiveValidatorIndices(validators []*pb.ValidatorRecord) []uint32 {
 	var indices = make([]uint32, len(validators))
@@ -23,7 +23,7 @@ func ActiveValidatorIndices(validators []*pb.ValidatorRecord) []uint32 {
 	return indices[len(validators):]
 }
 
-// ExitedValidatorIndices filters out exited validators based on start and end dynasty
+// ExitedValidatorIndices filters out exited validators based on validator status
 // and returns their indices in a list.
 func ExitedValidatorIndices(validators []*pb.ValidatorRecord) []uint32 {
 	var indices = make([]uint32, len(validators))
@@ -35,7 +35,7 @@ func ExitedValidatorIndices(validators []*pb.ValidatorRecord) []uint32 {
 	return indices[len(validators):]
 }
 
-// QueuedValidatorIndices filters out queued validators based on start and end dynasty
+// QueuedValidatorIndices filters out queued validators based on validator status
 // and returns their indices in a list.
 func QueuedValidatorIndices(validators []*pb.ValidatorRecord) []uint32 {
 	var indices = make([]uint32, len(validators))
diff --git a/beacon-chain/casper/validator_test.go b/beacon-chain/casper/validator_test.go
index 0f057e1204..50443de222 100644
--- a/beacon-chain/casper/validator_test.go
+++ b/beacon-chain/casper/validator_test.go
@@ -49,7 +49,7 @@ func TestValidatorIndices(t *testing.T) {
 			{Pubkey: []byte{}, Status: uint64(params.Active)},            // active.
 			{Pubkey: []byte{}, Status: uint64(params.PendingActivation)}, // queued.
 		},
-		Dynasty: 1,
+		ValidatorSetChangeSlot: 1,
 	}
 
 	if !reflect.DeepEqual(ActiveValidatorIndices(data.Validators), []uint32{0, 1, 2, 3, 4}) {
diff --git a/beacon-chain/db/state_test.go b/beacon-chain/db/state_test.go
index 929feb0a03..32ceccb693 100644
--- a/beacon-chain/db/state_test.go
+++ b/beacon-chain/db/state_test.go
@@ -35,8 +35,7 @@ func TestSaveCrystallizedState(t *testing.T) {
 	defer beaconDB.Close()
 
 	data := &pb.CrystallizedState{
-		Dynasty:     3,
-		DynastySeed: []byte{'A'},
+		ValidatorSetChangeSlot: 3,
 	}
 	crystallized := types.NewCrystallizedState(data)
 
diff --git a/beacon-chain/params/config.go b/beacon-chain/params/config.go
index 040212758c..3e1c9f8f33 100644
--- a/beacon-chain/params/config.go
+++ b/beacon-chain/params/config.go
@@ -18,57 +18,54 @@ type ValidatorSetDeltaFlags int
 
 // Config contains configs for node to participate in beacon chain.
 type Config struct {
-	ShardCount                  int       // ShardCount is the fixed number of shards in Ethereum 2.0.
-	DepositSize                 int       // DepositSize is how much a validator has deposited in Gwei.
-	BootstrappedValidatorsCount int       // BootstrappedValidatorsCount is the number of validators we seed the first crystallized state.
-	ModuloBias                  int       // ModuloBias is the upper bound of validator shuffle function. Can shuffle validator lists up to that size.
-	Gwei                        int       // Gwei is the denomination of Gwei in Ether.
-	CycleLength                 uint64    // CycleLength is one beacon chain cycle length in slots.
-	SlotDuration                uint64    // SlotDuration is how many seconds are in a single slot.
-	MinCommiteeSize             uint64    // MinDynastyLength is the slots needed before dynasty transition happens.
-	DefaultEndDynasty           uint64    // DefaultEndDynasty is the upper bound of dynasty. We use it to track queued and exited validators.
-	MinDynastyLength            uint64    // MinCommiteeSize is the minimal number of validator needs to be in a committee.
-	BaseRewardQuotient          uint64    // BaseRewardQuotient is used to calculate validator per-slot interest rate.
-	SqrtExpDropTime             uint64    // SqrtEDropTime is a constant to reflect time it takes to cut offline validators’ deposits by 39.4%.
-	GenesisTime                 time.Time // GenesisTime used by the protocol.
-	LogOutMessage               string    // This is the message a validator will send in order to log out.
-	WithdrawalPeriod            uint64    // WithdrawalPeriod is the number of slots between a validator exit and validator balance being withdrawable.
-	MaxValidatorChurnQuotient   uint64    // MaxValidatorChurnQuotient defines the quotient how many validators can change during each dynasty.
+	ShardCount                    int       // ShardCount is the fixed number of shards in Ethereum 2.0.
+	DepositSize                   int       // DepositSize is how much a validator has deposited in Gwei.
+	BootstrappedValidatorsCount   int       // BootstrappedValidatorsCount is the number of validators we seed the first crystallized state.
+	ModuloBias                    int       // ModuloBias is the upper bound of validator shuffle function. Can shuffle validator lists up to that size.
+	Gwei                          int       // Gwei is the denomination of Gwei in Ether.
+	CycleLength                   uint64    // CycleLength is one beacon chain cycle length in slots.
+	SlotDuration                  uint64    // SlotDuration is how many seconds are in a single slot.
+	MinValidatorSetChangeInterval uint64    // MinValidatorSetChangeInterval is the slots needed before validator set changes.
+	MinCommiteeSize               uint64    // MinCommiteeSize is the minimal number of validator needs to be in a committee.
+	BaseRewardQuotient            uint64    // BaseRewardQuotient is used to calculate validator per-slot interest rate.
+	SqrtExpDropTime               uint64    // SqrtEDropTime is a constant to reflect time it takes to cut offline validators’ deposits by 39.4%.
+	GenesisTime                   time.Time // GenesisTime used by the protocol.
+	LogOutMessage                 string    // This is the message a validator will send in order to log out.
+	WithdrawalPeriod              uint64    // WithdrawalPeriod is the number of slots between a validator exit and validator balance being withdrawable.
+	MaxValidatorChurnQuotient     uint64    // MaxValidatorChurnQuotient defines the quotient how many validators can change each time.
 }
 
 var defaultConfig = &Config{
-	GenesisTime:                 time.Date(2018, 9, 0, 0, 0, 0, 0, time.UTC),
-	ModuloBias:                  16777216,
-	CycleLength:                 uint64(64),
-	ShardCount:                  1024,
-	Gwei:                        1e9,
-	DepositSize:                 32,
-	SlotDuration:                uint64(8),
-	MinCommiteeSize:             uint64(128),
-	DefaultEndDynasty:           uint64(999999999999999999),
-	BootstrappedValidatorsCount: 1000,
-	MinDynastyLength:            uint64(256),
-	BaseRewardQuotient:          uint64(32768),
-	SqrtExpDropTime:             uint64(65536),
-	WithdrawalPeriod:            uint64(524288),
-	MaxValidatorChurnQuotient:   uint64(32),
+	GenesisTime:                   time.Date(2018, 9, 0, 0, 0, 0, 0, time.UTC),
+	ModuloBias:                    16777216,
+	CycleLength:                   uint64(64),
+	ShardCount:                    1024,
+	Gwei:                          1e9,
+	DepositSize:                   32,
+	SlotDuration:                  uint64(8),
+	MinCommiteeSize:               uint64(128),
+	BootstrappedValidatorsCount:   1000,
+	MinValidatorSetChangeInterval: uint64(256),
+	BaseRewardQuotient:            uint64(32768),
+	SqrtExpDropTime:               uint64(65536),
+	WithdrawalPeriod:              uint64(524288),
+	MaxValidatorChurnQuotient:     uint64(32),
 }
 
 var demoConfig = &Config{
-	GenesisTime:               time.Now(),
-	ModuloBias:                16777216,
-	CycleLength:               uint64(5),
-	ShardCount:                5,
-	Gwei:                      1e9,
-	DepositSize:               32,
-	SlotDuration:              uint64(8),
-	MinCommiteeSize:           uint64(3),
-	DefaultEndDynasty:         uint64(999999999999999999),
-	MinDynastyLength:          uint64(256),
-	BaseRewardQuotient:        uint64(32768),
-	SqrtExpDropTime:           uint64(65536),
-	WithdrawalPeriod:          uint64(128),
-	MaxValidatorChurnQuotient: uint64(32),
+	GenesisTime:                   time.Now(),
+	ModuloBias:                    16777216,
+	CycleLength:                   uint64(5),
+	ShardCount:                    5,
+	Gwei:                          1e9,
+	DepositSize:                   32,
+	SlotDuration:                  uint64(8),
+	MinCommiteeSize:               uint64(3),
+	MinValidatorSetChangeInterval: uint64(256),
+	BaseRewardQuotient:            uint64(32768),
+	SqrtExpDropTime:               uint64(65536),
+	WithdrawalPeriod:              uint64(128),
+	MaxValidatorChurnQuotient:     uint64(32),
 }
 
 const (
diff --git a/beacon-chain/sync/initial-sync/service_test.go b/beacon-chain/sync/initial-sync/service_test.go
index 1fb8e144ca..4fb46157b1 100644
--- a/beacon-chain/sync/initial-sync/service_test.go
+++ b/beacon-chain/sync/initial-sync/service_test.go
@@ -78,7 +78,6 @@ func TestSetBlockForInitialSync(t *testing.T) {
 	}
 
 	blockResponse := &pb.BeaconBlockResponse{Block: block}
-
 	msg1 := p2p.Message{
 		Peer: p2p.Peer{},
 		Data: blockResponse,
diff --git a/beacon-chain/types/crystallized_state.go b/beacon-chain/types/crystallized_state.go
index 310dd83e67..7e8fe92918 100644
--- a/beacon-chain/types/crystallized_state.go
+++ b/beacon-chain/types/crystallized_state.go
@@ -95,9 +95,9 @@ func NewGenesisCrystallizedState(genesisJSONPath string) (*CrystallizedState, er
 	var crosslinks []*pb.CrosslinkRecord
 	for i := 0; i < shardCount; i++ {
 		crosslinks = append(crosslinks, &pb.CrosslinkRecord{
-			Dynasty:        0,
-			ShardBlockHash: make([]byte, 0, 32),
-			Slot:           0,
+			RecentlyChanged: false,
+			ShardBlockHash:  make([]byte, 0, 32),
+			Slot:            0,
 		})
 	}
 
@@ -113,9 +113,7 @@ func NewGenesisCrystallizedState(genesisJSONPath string) (*CrystallizedState, er
 			JustifiedStreak:            0,
 			LastJustifiedSlot:          0,
 			LastFinalizedSlot:          0,
-			Dynasty:                    1,
-			DynastySeed:                []byte{},
-			DynastyStartSlot:           0,
+			ValidatorSetChangeSlot:     0,
 			Crosslinks:                 crosslinks,
 			Validators:                 genesisValidators,
 			ShardAndCommitteesForSlots: shardAndCommitteesForSlots,
@@ -166,11 +164,6 @@ func (c *CrystallizedState) LastFinalizedSlot() uint64 {
 	return c.data.LastFinalizedSlot
 }
 
-// Dynasty returns the current dynasty of the beacon chain.
-func (c *CrystallizedState) Dynasty() uint64 {
-	return c.data.Dynasty
-}
-
 // TotalDeposits returns total balance of the deposits of the active validators.
 func (c *CrystallizedState) TotalDeposits() uint64 {
 	validators := c.data.Validators
@@ -178,9 +171,9 @@ func (c *CrystallizedState) TotalDeposits() uint64 {
 	return totalDeposit
 }
 
-// DynastyStartSlot returns the last dynasty start number.
-func (c *CrystallizedState) DynastyStartSlot() uint64 {
-	return c.data.DynastyStartSlot
+// ValidatorSetChangeSlot returns the slot of last time validator set changes.
+func (c *CrystallizedState) ValidatorSetChangeSlot() uint64 {
+	return c.data.ValidatorSetChangeSlot
 }
 
 // ShardAndCommitteesForSlots returns the shard committee object.
@@ -193,13 +186,6 @@ func (c *CrystallizedState) Crosslinks() []*pb.CrosslinkRecord {
 	return c.data.Crosslinks
 }
 
-// DynastySeed is used to select the committee for each shard.
-func (c *CrystallizedState) DynastySeed() [32]byte {
-	var h [32]byte
-	copy(h[:], c.data.DynastySeed)
-	return h
-}
-
 // Validators returns list of validators.
 func (c *CrystallizedState) Validators() []*pb.ValidatorRecord {
 	return c.data.Validators
@@ -219,13 +205,13 @@ func (c *CrystallizedState) IsCycleTransition(slotNumber uint64) bool {
 	return slotNumber >= c.LastStateRecalculationSlot()+params.GetConfig().CycleLength-1
 }
 
-// isDynastyTransition checks if a dynasty transition can be processed. At that point,
+// isValidatorSetChange checks if a validator set change transition can be processed. At that point,
 // validator shuffle will occur.
-func (c *CrystallizedState) isDynastyTransition(slotNumber uint64) bool {
-	if c.LastFinalizedSlot() <= c.DynastyStartSlot() {
+func (c *CrystallizedState) isValidatorSetChange(slotNumber uint64) bool {
+	if c.LastFinalizedSlot() <= c.ValidatorSetChangeSlot() {
 		return false
 	}
-	if slotNumber-c.DynastyStartSlot() < params.GetConfig().MinDynastyLength {
+	if slotNumber-c.ValidatorSetChangeSlot() < params.GetConfig().MinValidatorSetChangeInterval {
 		return false
 	}
 
@@ -239,7 +225,7 @@ func (c *CrystallizedState) isDynastyTransition(slotNumber uint64) bool {
 
 	crosslinks := c.Crosslinks()
 	for shard := range shardProcessed {
-		if c.DynastyStartSlot() >= crosslinks[shard].Slot {
+		if c.ValidatorSetChangeSlot() >= crosslinks[shard].Slot {
 			return false
 		}
 	}
@@ -262,7 +248,7 @@ func (c *CrystallizedState) getAttesterIndices(attestation *pb.AggregatedAttesta
 
 // NewStateRecalculations computes the new crystallized state, given the previous crystallized state
 // and the current active state. This method is called during a cycle transition.
-// We also check for dynasty transition and compute for a new dynasty if necessary during this transition.
+// We also check for validator set change transition and compute for new committees if necessary during this transition.
 func (c *CrystallizedState) NewStateRecalculations(aState *ActiveState, block *Block, enableCrossLinks bool, enableRewardChecking bool) (*CrystallizedState, *ActiveState, error) {
 	var blockVoteBalance uint64
 	var LastStateRecalculationSlotCycleBack uint64
@@ -273,18 +259,17 @@ func (c *CrystallizedState) NewStateRecalculations(aState *ActiveState, block *B
 	justifiedStreak := c.JustifiedStreak()
 	justifiedSlot := c.LastJustifiedSlot()
 	finalizedSlot := c.LastFinalizedSlot()
-	LastStateRecalculationSlot := c.LastStateRecalculationSlot()
-	Dynasty := c.Dynasty()
-	DynastyStartSlot := c.DynastyStartSlot()
+	lastStateRecalculationSlot := c.LastStateRecalculationSlot()
+	validatorSetChangeSlot := c.ValidatorSetChangeSlot()
 	blockVoteCache := aState.GetBlockVoteCache()
 	ShardAndCommitteesForSlots := c.ShardAndCommitteesForSlots()
 	timeSinceFinality := block.SlotNumber() - c.LastFinalizedSlot()
 	recentBlockHashes := aState.RecentBlockHashes()
 
-	if LastStateRecalculationSlot < params.GetConfig().CycleLength {
+	if lastStateRecalculationSlot < params.GetConfig().CycleLength {
 		LastStateRecalculationSlotCycleBack = 0
 	} else {
-		LastStateRecalculationSlotCycleBack = LastStateRecalculationSlot - params.GetConfig().CycleLength
+		LastStateRecalculationSlotCycleBack = lastStateRecalculationSlot - params.GetConfig().CycleLength
 	}
 
 	// If reward checking is disabled, the new set of validators for the cycle
@@ -338,14 +323,14 @@ func (c *CrystallizedState) NewStateRecalculations(aState *ActiveState, block *B
 	}
 
 	// Clean up old attestations.
-	newPendingAttestations := aState.cleanUpAttestations(LastStateRecalculationSlot)
+	newPendingAttestations := aState.cleanUpAttestations(lastStateRecalculationSlot)
 
 	c.data.LastFinalizedSlot = finalizedSlot
-	// Entering new dynasty transition.
-	if c.isDynastyTransition(block.SlotNumber()) {
-		log.Info("Entering dynasty transition")
-		DynastyStartSlot = LastStateRecalculationSlot
-		Dynasty, ShardAndCommitteesForSlots, err = c.newDynastyRecalculations(block.ParentHash())
+	// Entering new validator set change transition.
+	if c.isValidatorSetChange(block.SlotNumber()) {
+		log.Info("Entering validator set change transition")
+		validatorSetChangeSlot = lastStateRecalculationSlot
+		ShardAndCommitteesForSlots, err = c.newValidatorSetRecalculations(block.ParentHash())
 		if err != nil {
 			return nil, nil, err
 		}
@@ -355,18 +340,16 @@ func (c *CrystallizedState) NewStateRecalculations(aState *ActiveState, block *B
 		casper.ChangeValidators(block.SlotNumber(), totalPenalties, newValidators)
 	}
 
-	// Construct new crystallized state after cycle and dynasty transition.
+	// Construct new crystallized state after cycle and validator set changed.
 	newCrystallizedState := NewCrystallizedState(&pb.CrystallizedState{
-		DynastySeed:                c.data.DynastySeed,
 		ShardAndCommitteesForSlots: ShardAndCommitteesForSlots,
 		Validators:                 newValidators,
-		LastStateRecalculationSlot: LastStateRecalculationSlot + params.GetConfig().CycleLength,
+		LastStateRecalculationSlot: lastStateRecalculationSlot + params.GetConfig().CycleLength,
 		LastJustifiedSlot:          justifiedSlot,
 		JustifiedStreak:            justifiedStreak,
 		LastFinalizedSlot:          finalizedSlot,
 		Crosslinks:                 newCrosslinks,
-		DynastyStartSlot:           DynastyStartSlot,
-		Dynasty:                    Dynasty,
+		ValidatorSetChangeSlot:     validatorSetChangeSlot,
 	})
 
 	// Construct new active state after clean up pending attestations.
@@ -378,13 +361,12 @@ func (c *CrystallizedState) NewStateRecalculations(aState *ActiveState, block *B
 	return newCrystallizedState, newActiveState, nil
 }
 
-// newDynastyRecalculations recomputes the validator set. This method is called during a dynasty transition.
-func (c *CrystallizedState) newDynastyRecalculations(seed [32]byte) (uint64, []*pb.ShardAndCommitteeArray, error) {
+// newValidatorSetRecalculations recomputes the validator set.
+func (c *CrystallizedState) newValidatorSetRecalculations(seed [32]byte) ([]*pb.ShardAndCommitteeArray, error) {
 	lastSlot := len(c.data.ShardAndCommitteesForSlots) - 1
 	lastCommitteeFromLastSlot := len(c.ShardAndCommitteesForSlots()[lastSlot].ArrayShardAndCommittee) - 1
 	crosslinkLastShard := c.ShardAndCommitteesForSlots()[lastSlot].ArrayShardAndCommittee[lastCommitteeFromLastSlot].Shard
 	crosslinkNextShard := (crosslinkLastShard + 1) % uint64(shardCount)
-	nextDynasty := c.Dynasty() + 1
 
 	newShardCommitteeArray, err := casper.ShuffleValidatorsToCommittees(
 		seed,
@@ -392,10 +374,10 @@ func (c *CrystallizedState) newDynastyRecalculations(seed [32]byte) (uint64, []*
 		crosslinkNextShard,
 	)
 	if err != nil {
-		return 0, nil, err
+		return nil, err
 	}
 
-	return nextDynasty, append(c.data.ShardAndCommitteesForSlots[:params.GetConfig().CycleLength], newShardCommitteeArray...), nil
+	return append(c.data.ShardAndCommitteesForSlots[:params.GetConfig().CycleLength], newShardCommitteeArray...), nil
 }
 
 type shardAttestation struct {
@@ -410,9 +392,9 @@ func copyCrosslinks(existing []*pb.CrosslinkRecord) []*pb.CrosslinkRecord {
 		newBlockhash := make([]byte, len(oldCL.ShardBlockHash))
 		copy(newBlockhash, oldCL.ShardBlockHash)
 		newCL := &pb.CrosslinkRecord{
-			Dynasty:        oldCL.Dynasty,
-			ShardBlockHash: newBlockhash,
-			Slot:           oldCL.Slot,
+			RecentlyChanged: oldCL.RecentlyChanged,
+			ShardBlockHash:  newBlockhash,
+			Slot:            oldCL.Slot,
 		}
 		new[i] = newCL
 	}
@@ -422,10 +404,9 @@ func copyCrosslinks(existing []*pb.CrosslinkRecord) []*pb.CrosslinkRecord {
 
 // processCrosslinks checks if the proposed shard block has recevied
 // 2/3 of the votes. If yes, we update crosslink record to point to
-// the proposed shard block with latest dynasty and slot numbers.
+// the proposed shard block with latest beacon chain slot numbers.
 func (c *CrystallizedState) processCrosslinks(pendingAttestations []*pb.AggregatedAttestation, slot uint64, currentSlot uint64) ([]*pb.CrosslinkRecord, error) {
 	validators := c.data.Validators
-	dynasty := c.data.Dynasty
 	crosslinkRecords := copyCrosslinks(c.data.Crosslinks)
 	rewardQuotient := casper.RewardQuotient(validators)
 
@@ -461,7 +442,7 @@ func (c *CrystallizedState) processCrosslinks(pendingAttestations []*pb.Aggregat
 		for _, attesterIndex := range indices {
 			timeSinceLastConfirmation := currentSlot - crosslinkRecords[attestation.Shard].GetSlot()
 
-			if crosslinkRecords[attestation.Slot].GetDynasty() != dynasty {
+			if !crosslinkRecords[attestation.Shard].RecentlyChanged {
 				if bitutil.CheckBit(attestation.AttesterBitfield, int(attesterIndex)) {
 					casper.RewardValidatorCrosslink(totalBalance, voteBalance, rewardQuotient, validators[attesterIndex])
 				} else {
@@ -473,12 +454,12 @@ func (c *CrystallizedState) processCrosslinks(pendingAttestations []*pb.Aggregat
 		shardAttestationBalance[shardAtt] += voteBalance
 
 		// if 2/3 of committee voted on this crosslink, update the crosslink
-		// with latest dynasty number, shard block hash, and slot number.
-		if 3*voteBalance >= 2*totalBalance && dynasty > crosslinkRecords[attestation.Shard].Dynasty {
+		// with latest shard block hash, and slot number.
+		if 3*voteBalance >= 2*totalBalance && !crosslinkRecords[attestation.Shard].RecentlyChanged {
 			crosslinkRecords[attestation.Shard] = &pb.CrosslinkRecord{
-				Dynasty:        dynasty,
-				ShardBlockHash: attestation.ShardBlockHash,
-				Slot:           slot,
+				RecentlyChanged: true,
+				ShardBlockHash:  attestation.ShardBlockHash,
+				Slot:            slot,
 			}
 		}
 	}
diff --git a/beacon-chain/types/crystallized_state_test.go b/beacon-chain/types/crystallized_state_test.go
index 7d63ec92c9..ac288e9c0c 100644
--- a/beacon-chain/types/crystallized_state_test.go
+++ b/beacon-chain/types/crystallized_state_test.go
@@ -169,7 +169,7 @@ func TestProcessCrosslinks(t *testing.T) {
 	// Set up crosslink record for every shard.
 	var clRecords []*pb.CrosslinkRecord
 	for i := 0; i < params.GetConfig().ShardCount; i++ {
-		clRecord := &pb.CrosslinkRecord{Dynasty: 1, ShardBlockHash: []byte{'A'}, Slot: 1}
+		clRecord := &pb.CrosslinkRecord{RecentlyChanged: false, ShardBlockHash: []byte{'A'}, Slot: 1}
 		clRecords = append(clRecords, clRecord)
 	}
 
@@ -193,7 +193,7 @@ func TestProcessCrosslinks(t *testing.T) {
 		},
 	}
 
-	// Process crosslinks happened at slot 50 and dynasty 2.
+	// Process crosslinks happened at slot 50.
 	shardAndCommitteesForSlots, err := initialShardAndCommitteesForSlots(validators)
 	if err != nil {
 		t.Fatalf("failed to initialize indices for slots: %v", err)
@@ -206,7 +206,6 @@ func TestProcessCrosslinks(t *testing.T) {
 	cState := NewCrystallizedState(&pb.CrystallizedState{
 		Crosslinks:                 clRecords,
 		Validators:                 validators,
-		Dynasty:                    5,
 		ShardAndCommitteesForSlots: shardAndCommitteesForSlots,
 	})
 	newCrosslinks, err := cState.processCrosslinks(pAttestations, 50, 100)
@@ -214,9 +213,6 @@ func TestProcessCrosslinks(t *testing.T) {
 		t.Fatalf("process crosslink failed %v", err)
 	}
 
-	if newCrosslinks[1].Dynasty != 5 {
-		t.Errorf("Dynasty did not change for new cross link. Wanted: 5. Got: %d", newCrosslinks[0].Dynasty)
-	}
 	if newCrosslinks[1].Slot != 50 {
 		t.Errorf("Slot did not change for new cross link. Wanted: 50. Got: %d", newCrosslinks[0].Slot)
 	}
@@ -226,18 +222,18 @@ func TestProcessCrosslinks(t *testing.T) {
 	//TODO(#538) Implement tests on balances of the validators in committee once big.Int is introduced.
 }
 
-func TestIsDynastyTransition(t *testing.T) {
+func TestIsNewValidatorSetTransition(t *testing.T) {
 	cState, err := NewGenesisCrystallizedState("")
 	if err != nil {
 		t.Fatalf("Failed to initialize crystallized state: %v", err)
 	}
-	cState.data.DynastyStartSlot = 1
-	if cState.isDynastyTransition(0) {
-		t.Errorf("Is Dynasty transtion should be false, dynasty start greater than finalized slot")
+	cState.data.ValidatorSetChangeSlot = 1
+	if cState.isValidatorSetChange(0) {
+		t.Errorf("Is new validator set change should be false, last changed slot greater than finalized slot")
 	}
 	cState.data.LastFinalizedSlot = 2
-	if cState.isDynastyTransition(1) {
-		t.Errorf("Is Dynasty transtion should be false, MinDynastyLength has not reached")
+	if cState.isValidatorSetChange(1) {
+		t.Errorf("Is new validator set change should be false, MinValidatorSetChangeInterval has not reached")
 	}
 	shardCommitteeForSlots := []*pb.ShardAndCommitteeArray{{
 		ArrayShardAndCommittee: []*pb.ShardAndCommittee{
@@ -256,8 +252,8 @@ func TestIsDynastyTransition(t *testing.T) {
 	}
 	cState.data.Crosslinks = crosslinks
 
-	if cState.isDynastyTransition(params.GetConfig().MinDynastyLength + 1) {
-		t.Errorf("Is Dynasty transtion should be false, crosslink records dynasty is higher than current slot")
+	if cState.isValidatorSetChange(params.GetConfig().MinValidatorSetChangeInterval + 1) {
+		t.Errorf("Is new validator set change should be false, crosslink slot record is higher than current slot")
 	}
 
 	crosslinks = []*pb.CrosslinkRecord{
@@ -267,12 +263,12 @@ func TestIsDynastyTransition(t *testing.T) {
 	}
 	cState.data.Crosslinks = crosslinks
 
-	if !cState.isDynastyTransition(params.GetConfig().MinDynastyLength + 1) {
-		t.Errorf("Dynasty transition failed should have been true")
+	if !cState.isValidatorSetChange(params.GetConfig().MinValidatorSetChangeInterval + 1) {
+		t.Errorf("New validator set changen failed should have been true")
 	}
 }
 
-func TestNewDynastyRecalculationsInvalid(t *testing.T) {
+func TestNewValidatorSetRecalculationsInvalid(t *testing.T) {
 	cState, err := NewGenesisCrystallizedState("")
 	if err != nil {
 		t.Fatalf("Failed to initialize crystallized state: %v", err)
@@ -286,12 +282,12 @@ func TestNewDynastyRecalculationsInvalid(t *testing.T) {
 		validators[i] = validator
 	}
 	cState.data.Validators = validators
-	if _, _, err := cState.newDynastyRecalculations([32]byte{'A'}); err == nil {
-		t.Errorf("Dynasty calculation should have failed with invalid validator count")
+	if _, err := cState.newValidatorSetRecalculations([32]byte{'A'}); err == nil {
+		t.Errorf("new validator set change calculation should have failed with invalid validator count")
 	}
 }
 
-func TestNewDynastyRecalculations(t *testing.T) {
+func TestNewValidatorSetRecalculations(t *testing.T) {
 	cState, err := NewGenesisCrystallizedState("")
 	if err != nil {
 		t.Fatalf("Failed to initialize crystallized state: %v", err)
@@ -300,7 +296,7 @@ func TestNewDynastyRecalculations(t *testing.T) {
 	// Create shard committee for every slot.
 	var shardCommitteesForSlot []*pb.ShardAndCommitteeArray
 	for i := 0; i < int(params.GetConfig().CycleLength); i++ {
-		// Only 10 shards gets crosslinked by validators this dynasty.
+		// Only 10 shards gets crosslinked by validators this period.
 		var shardCommittees []*pb.ShardAndCommittee
 		for i := 0; i < 10; i++ {
 			shardCommittees = append(shardCommittees, &pb.ShardAndCommittee{Shard: uint64(i)})
@@ -309,17 +305,12 @@ func TestNewDynastyRecalculations(t *testing.T) {
 	}
 
 	cState.data.ShardAndCommitteesForSlots = shardCommitteesForSlot
-	cState.data.Dynasty = 1
 	cState.data.LastStateRecalculationSlot = 65
 
 	shardCount = 10
-	Dynasty, _, err := cState.newDynastyRecalculations([32]byte{'A'})
+	_, err = cState.newValidatorSetRecalculations([32]byte{'A'})
 	if err != nil {
-		t.Fatalf("Dynasty calculation failed %v", err)
-	}
-
-	if Dynasty != 2 {
-		t.Errorf("Incorrect dynasty number, wanted 2, got: %d", Dynasty)
+		t.Fatalf("New validator set change failed %v", err)
 	}
 }
 
diff --git a/proto/beacon/p2p/v1/messages.pb.go b/proto/beacon/p2p/v1/messages.pb.go
index ed25ca5189..a54fc4a963 100644
--- a/proto/beacon/p2p/v1/messages.pb.go
+++ b/proto/beacon/p2p/v1/messages.pb.go
@@ -66,7 +66,7 @@ func (x Topic) String() string {
 	return proto.EnumName(Topic_name, int32(x))
 }
 func (Topic) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{0}
+	return fileDescriptor_messages_c970645187427d5d, []int{0}
 }
 
 type BeaconBlockHashAnnounce struct {
@@ -80,7 +80,7 @@ func (m *BeaconBlockHashAnnounce) Reset()         { *m = BeaconBlockHashAnnounce
 func (m *BeaconBlockHashAnnounce) String() string { return proto.CompactTextString(m) }
 func (*BeaconBlockHashAnnounce) ProtoMessage()    {}
 func (*BeaconBlockHashAnnounce) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{0}
+	return fileDescriptor_messages_c970645187427d5d, []int{0}
 }
 func (m *BeaconBlockHashAnnounce) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_BeaconBlockHashAnnounce.Unmarshal(m, b)
@@ -118,7 +118,7 @@ func (m *BeaconBlockRequest) Reset()         { *m = BeaconBlockRequest{} }
 func (m *BeaconBlockRequest) String() string { return proto.CompactTextString(m) }
 func (*BeaconBlockRequest) ProtoMessage()    {}
 func (*BeaconBlockRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{1}
+	return fileDescriptor_messages_c970645187427d5d, []int{1}
 }
 func (m *BeaconBlockRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_BeaconBlockRequest.Unmarshal(m, b)
@@ -156,7 +156,7 @@ func (m *BeaconBlockRequestBySlotNumber) Reset()         { *m = BeaconBlockReque
 func (m *BeaconBlockRequestBySlotNumber) String() string { return proto.CompactTextString(m) }
 func (*BeaconBlockRequestBySlotNumber) ProtoMessage()    {}
 func (*BeaconBlockRequestBySlotNumber) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{2}
+	return fileDescriptor_messages_c970645187427d5d, []int{2}
 }
 func (m *BeaconBlockRequestBySlotNumber) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_BeaconBlockRequestBySlotNumber.Unmarshal(m, b)
@@ -195,7 +195,7 @@ func (m *BeaconBlockResponse) Reset()         { *m = BeaconBlockResponse{} }
 func (m *BeaconBlockResponse) String() string { return proto.CompactTextString(m) }
 func (*BeaconBlockResponse) ProtoMessage()    {}
 func (*BeaconBlockResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{3}
+	return fileDescriptor_messages_c970645187427d5d, []int{3}
 }
 func (m *BeaconBlockResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_BeaconBlockResponse.Unmarshal(m, b)
@@ -248,7 +248,7 @@ func (m *BeaconBlock) Reset()         { *m = BeaconBlock{} }
 func (m *BeaconBlock) String() string { return proto.CompactTextString(m) }
 func (*BeaconBlock) ProtoMessage()    {}
 func (*BeaconBlock) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{4}
+	return fileDescriptor_messages_c970645187427d5d, []int{4}
 }
 func (m *BeaconBlock) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_BeaconBlock.Unmarshal(m, b)
@@ -342,7 +342,7 @@ func (m *CrystallizedStateHashAnnounce) Reset()         { *m = CrystallizedState
 func (m *CrystallizedStateHashAnnounce) String() string { return proto.CompactTextString(m) }
 func (*CrystallizedStateHashAnnounce) ProtoMessage()    {}
 func (*CrystallizedStateHashAnnounce) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{5}
+	return fileDescriptor_messages_c970645187427d5d, []int{5}
 }
 func (m *CrystallizedStateHashAnnounce) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CrystallizedStateHashAnnounce.Unmarshal(m, b)
@@ -380,7 +380,7 @@ func (m *CrystallizedStateRequest) Reset()         { *m = CrystallizedStateReque
 func (m *CrystallizedStateRequest) String() string { return proto.CompactTextString(m) }
 func (*CrystallizedStateRequest) ProtoMessage()    {}
 func (*CrystallizedStateRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{6}
+	return fileDescriptor_messages_c970645187427d5d, []int{6}
 }
 func (m *CrystallizedStateRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CrystallizedStateRequest.Unmarshal(m, b)
@@ -418,7 +418,7 @@ func (m *CrystallizedStateResponse) Reset()         { *m = CrystallizedStateResp
 func (m *CrystallizedStateResponse) String() string { return proto.CompactTextString(m) }
 func (*CrystallizedStateResponse) ProtoMessage()    {}
 func (*CrystallizedStateResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{7}
+	return fileDescriptor_messages_c970645187427d5d, []int{7}
 }
 func (m *CrystallizedStateResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CrystallizedStateResponse.Unmarshal(m, b)
@@ -450,17 +450,15 @@ type CrystallizedState struct {
 	JustifiedStreak            uint64                    `protobuf:"varint,2,opt,name=justified_streak,json=justifiedStreak,proto3" json:"justified_streak,omitempty"`
 	LastJustifiedSlot          uint64                    `protobuf:"varint,3,opt,name=last_justified_slot,json=lastJustifiedSlot,proto3" json:"last_justified_slot,omitempty"`
 	LastFinalizedSlot          uint64                    `protobuf:"varint,4,opt,name=last_finalized_slot,json=lastFinalizedSlot,proto3" json:"last_finalized_slot,omitempty"`
-	Dynasty                    uint64                    `protobuf:"varint,5,opt,name=dynasty,proto3" json:"dynasty,omitempty"`
-	DynastySeed                []byte                    `protobuf:"bytes,6,opt,name=dynasty_seed,json=dynastySeed,proto3" json:"dynasty_seed,omitempty"`
-	DynastyStartSlot           uint64                    `protobuf:"varint,7,opt,name=dynasty_start_slot,json=dynastyStartSlot,proto3" json:"dynasty_start_slot,omitempty"`
-	Crosslinks                 []*CrosslinkRecord        `protobuf:"bytes,8,rep,name=crosslinks,proto3" json:"crosslinks,omitempty"`
-	Validators                 []*ValidatorRecord        `protobuf:"bytes,9,rep,name=validators,proto3" json:"validators,omitempty"`
-	ShardAndCommitteesForSlots []*ShardAndCommitteeArray `protobuf:"bytes,10,rep,name=shard_and_committees_for_slots,json=shardAndCommitteesForSlots,proto3" json:"shard_and_committees_for_slots,omitempty"`
-	DepositsPenalizedInPeriod  []uint32                  `protobuf:"varint,11,rep,packed,name=deposits_penalized_in_period,json=depositsPenalizedInPeriod,proto3" json:"deposits_penalized_in_period,omitempty"`
-	ValidatorSetDeltaHashChain []byte                    `protobuf:"bytes,12,opt,name=validator_set_delta_hash_chain,json=validatorSetDeltaHashChain,proto3" json:"validator_set_delta_hash_chain,omitempty"`
-	PreForkVersion             uint32                    `protobuf:"varint,13,opt,name=pre_fork_version,json=preForkVersion,proto3" json:"pre_fork_version,omitempty"`
-	PostForkVersion            uint32                    `protobuf:"varint,14,opt,name=post_fork_version,json=postForkVersion,proto3" json:"post_fork_version,omitempty"`
-	ForkSlotNumber             uint64                    `protobuf:"varint,15,opt,name=fork_slot_number,json=forkSlotNumber,proto3" json:"fork_slot_number,omitempty"`
+	ValidatorSetChangeSlot     uint64                    `protobuf:"varint,5,opt,name=validator_set_change_slot,json=validatorSetChangeSlot,proto3" json:"validator_set_change_slot,omitempty"`
+	Crosslinks                 []*CrosslinkRecord        `protobuf:"bytes,6,rep,name=crosslinks,proto3" json:"crosslinks,omitempty"`
+	Validators                 []*ValidatorRecord        `protobuf:"bytes,7,rep,name=validators,proto3" json:"validators,omitempty"`
+	ShardAndCommitteesForSlots []*ShardAndCommitteeArray `protobuf:"bytes,8,rep,name=shard_and_committees_for_slots,json=shardAndCommitteesForSlots,proto3" json:"shard_and_committees_for_slots,omitempty"`
+	DepositsPenalizedInPeriod  []uint32                  `protobuf:"varint,9,rep,packed,name=deposits_penalized_in_period,json=depositsPenalizedInPeriod,proto3" json:"deposits_penalized_in_period,omitempty"`
+	ValidatorSetDeltaHashChain []byte                    `protobuf:"bytes,10,opt,name=validator_set_delta_hash_chain,json=validatorSetDeltaHashChain,proto3" json:"validator_set_delta_hash_chain,omitempty"`
+	PreForkVersion             uint32                    `protobuf:"varint,11,opt,name=pre_fork_version,json=preForkVersion,proto3" json:"pre_fork_version,omitempty"`
+	PostForkVersion            uint32                    `protobuf:"varint,12,opt,name=post_fork_version,json=postForkVersion,proto3" json:"post_fork_version,omitempty"`
+	ForkSlotNumber             uint64                    `protobuf:"varint,13,opt,name=fork_slot_number,json=forkSlotNumber,proto3" json:"fork_slot_number,omitempty"`
 	XXX_NoUnkeyedLiteral       struct{}                  `json:"-"`
 	XXX_unrecognized           []byte                    `json:"-"`
 	XXX_sizecache              int32                     `json:"-"`
@@ -470,7 +468,7 @@ func (m *CrystallizedState) Reset()         { *m = CrystallizedState{} }
 func (m *CrystallizedState) String() string { return proto.CompactTextString(m) }
 func (*CrystallizedState) ProtoMessage()    {}
 func (*CrystallizedState) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{8}
+	return fileDescriptor_messages_c970645187427d5d, []int{8}
 }
 func (m *CrystallizedState) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CrystallizedState.Unmarshal(m, b)
@@ -518,23 +516,9 @@ func (m *CrystallizedState) GetLastFinalizedSlot() uint64 {
 	return 0
 }
 
-func (m *CrystallizedState) GetDynasty() uint64 {
+func (m *CrystallizedState) GetValidatorSetChangeSlot() uint64 {
 	if m != nil {
-		return m.Dynasty
-	}
-	return 0
-}
-
-func (m *CrystallizedState) GetDynastySeed() []byte {
-	if m != nil {
-		return m.DynastySeed
-	}
-	return nil
-}
-
-func (m *CrystallizedState) GetDynastyStartSlot() uint64 {
-	if m != nil {
-		return m.DynastyStartSlot
+		return m.ValidatorSetChangeSlot
 	}
 	return 0
 }
@@ -606,7 +590,7 @@ func (m *ShardAndCommitteeArray) Reset()         { *m = ShardAndCommitteeArray{}
 func (m *ShardAndCommitteeArray) String() string { return proto.CompactTextString(m) }
 func (*ShardAndCommitteeArray) ProtoMessage()    {}
 func (*ShardAndCommitteeArray) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{9}
+	return fileDescriptor_messages_c970645187427d5d, []int{9}
 }
 func (m *ShardAndCommitteeArray) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ShardAndCommitteeArray.Unmarshal(m, b)
@@ -644,7 +628,7 @@ func (m *ActiveStateHashAnnounce) Reset()         { *m = ActiveStateHashAnnounce
 func (m *ActiveStateHashAnnounce) String() string { return proto.CompactTextString(m) }
 func (*ActiveStateHashAnnounce) ProtoMessage()    {}
 func (*ActiveStateHashAnnounce) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{10}
+	return fileDescriptor_messages_c970645187427d5d, []int{10}
 }
 func (m *ActiveStateHashAnnounce) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ActiveStateHashAnnounce.Unmarshal(m, b)
@@ -682,7 +666,7 @@ func (m *ActiveStateRequest) Reset()         { *m = ActiveStateRequest{} }
 func (m *ActiveStateRequest) String() string { return proto.CompactTextString(m) }
 func (*ActiveStateRequest) ProtoMessage()    {}
 func (*ActiveStateRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{11}
+	return fileDescriptor_messages_c970645187427d5d, []int{11}
 }
 func (m *ActiveStateRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ActiveStateRequest.Unmarshal(m, b)
@@ -721,7 +705,7 @@ func (m *ShardAndCommittee) Reset()         { *m = ShardAndCommittee{} }
 func (m *ShardAndCommittee) String() string { return proto.CompactTextString(m) }
 func (*ShardAndCommittee) ProtoMessage()    {}
 func (*ShardAndCommittee) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{12}
+	return fileDescriptor_messages_c970645187427d5d, []int{12}
 }
 func (m *ShardAndCommittee) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ShardAndCommittee.Unmarshal(m, b)
@@ -766,7 +750,7 @@ func (m *ActiveStateResponse) Reset()         { *m = ActiveStateResponse{} }
 func (m *ActiveStateResponse) String() string { return proto.CompactTextString(m) }
 func (*ActiveStateResponse) ProtoMessage()    {}
 func (*ActiveStateResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{13}
+	return fileDescriptor_messages_c970645187427d5d, []int{13}
 }
 func (m *ActiveStateResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ActiveStateResponse.Unmarshal(m, b)
@@ -807,7 +791,7 @@ func (m *ActiveState) Reset()         { *m = ActiveState{} }
 func (m *ActiveState) String() string { return proto.CompactTextString(m) }
 func (*ActiveState) ProtoMessage()    {}
 func (*ActiveState) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{14}
+	return fileDescriptor_messages_c970645187427d5d, []int{14}
 }
 func (m *ActiveState) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ActiveState.Unmarshal(m, b)
@@ -872,7 +856,7 @@ func (m *ValidatorRecord) Reset()         { *m = ValidatorRecord{} }
 func (m *ValidatorRecord) String() string { return proto.CompactTextString(m) }
 func (*ValidatorRecord) ProtoMessage()    {}
 func (*ValidatorRecord) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{15}
+	return fileDescriptor_messages_c970645187427d5d, []int{15}
 }
 func (m *ValidatorRecord) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ValidatorRecord.Unmarshal(m, b)
@@ -959,7 +943,7 @@ func (m *AggregatedAttestation) Reset()         { *m = AggregatedAttestation{} }
 func (m *AggregatedAttestation) String() string { return proto.CompactTextString(m) }
 func (*AggregatedAttestation) ProtoMessage()    {}
 func (*AggregatedAttestation) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{16}
+	return fileDescriptor_messages_c970645187427d5d, []int{16}
 }
 func (m *AggregatedAttestation) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_AggregatedAttestation.Unmarshal(m, b)
@@ -1051,7 +1035,7 @@ func (m *AttestationSignedData) Reset()         { *m = AttestationSignedData{} }
 func (m *AttestationSignedData) String() string { return proto.CompactTextString(m) }
 func (*AttestationSignedData) ProtoMessage()    {}
 func (*AttestationSignedData) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{17}
+	return fileDescriptor_messages_c970645187427d5d, []int{17}
 }
 func (m *AttestationSignedData) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_AttestationSignedData.Unmarshal(m, b)
@@ -1114,7 +1098,7 @@ func (m *AttestationSignedData) GetJustifiedSlot() uint64 {
 }
 
 type CrosslinkRecord struct {
-	Dynasty              uint64   `protobuf:"varint,1,opt,name=dynasty,proto3" json:"dynasty,omitempty"`
+	RecentlyChanged      bool     `protobuf:"varint,1,opt,name=recently_changed,json=recentlyChanged,proto3" json:"recently_changed,omitempty"`
 	ShardBlockHash       []byte   `protobuf:"bytes,2,opt,name=shard_block_hash,json=shardBlockHash,proto3" json:"shard_block_hash,omitempty"`
 	Slot                 uint64   `protobuf:"varint,3,opt,name=slot,proto3" json:"slot,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
@@ -1126,7 +1110,7 @@ func (m *CrosslinkRecord) Reset()         { *m = CrosslinkRecord{} }
 func (m *CrosslinkRecord) String() string { return proto.CompactTextString(m) }
 func (*CrosslinkRecord) ProtoMessage()    {}
 func (*CrosslinkRecord) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{18}
+	return fileDescriptor_messages_c970645187427d5d, []int{18}
 }
 func (m *CrosslinkRecord) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CrosslinkRecord.Unmarshal(m, b)
@@ -1146,11 +1130,11 @@ func (m *CrosslinkRecord) XXX_DiscardUnknown() {
 
 var xxx_messageInfo_CrosslinkRecord proto.InternalMessageInfo
 
-func (m *CrosslinkRecord) GetDynasty() uint64 {
+func (m *CrosslinkRecord) GetRecentlyChanged() bool {
 	if m != nil {
-		return m.Dynasty
+		return m.RecentlyChanged
 	}
-	return 0
+	return false
 }
 
 func (m *CrosslinkRecord) GetShardBlockHash() []byte {
@@ -1178,7 +1162,7 @@ func (m *AttestationHashes) Reset()         { *m = AttestationHashes{} }
 func (m *AttestationHashes) String() string { return proto.CompactTextString(m) }
 func (*AttestationHashes) ProtoMessage()    {}
 func (*AttestationHashes) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{19}
+	return fileDescriptor_messages_c970645187427d5d, []int{19}
 }
 func (m *AttestationHashes) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_AttestationHashes.Unmarshal(m, b)
@@ -1217,7 +1201,7 @@ func (m *SpecialRecord) Reset()         { *m = SpecialRecord{} }
 func (m *SpecialRecord) String() string { return proto.CompactTextString(m) }
 func (*SpecialRecord) ProtoMessage()    {}
 func (*SpecialRecord) Descriptor() ([]byte, []int) {
-	return fileDescriptor_messages_ab72a247cb5f2712, []int{20}
+	return fileDescriptor_messages_c970645187427d5d, []int{20}
 }
 func (m *SpecialRecord) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SpecialRecord.Unmarshal(m, b)
@@ -1276,105 +1260,104 @@ func init() {
 	proto.RegisterEnum("ethereum.beacon.p2p.v1.Topic", Topic_name, Topic_value)
 }
 
-func init() { proto.RegisterFile("messages.proto", fileDescriptor_messages_ab72a247cb5f2712) }
+func init() { proto.RegisterFile("messages.proto", fileDescriptor_messages_c970645187427d5d) }
 
-var fileDescriptor_messages_ab72a247cb5f2712 = []byte{
-	// 1541 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x9c, 0x57, 0x59, 0x73, 0x1b, 0x37,
-	0x12, 0x5e, 0x1e, 0xba, 0x9a, 0xa4, 0x48, 0x42, 0x87, 0x29, 0xd9, 0x96, 0xb5, 0xa3, 0x75, 0x59,
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+	0x42, 0xbc, 0x21, 0x09, 0xa5, 0x66, 0xa4, 0xd4, 0x6a, 0x0c, 0xe8, 0x11, 0xde, 0x96, 0x6c, 0x29,
+	0xfa, 0x0c, 0xc0, 0x0a, 0x28, 0x63, 0xae, 0xe3, 0x9d, 0xb0, 0xc6, 0xac, 0xcc, 0x9f, 0x3b, 0x97,
+	0x3b, 0x5c, 0x21, 0x55, 0x06, 0xa5, 0x44, 0x85, 0xa2, 0xf8, 0x0a, 0xd6, 0x98, 0xbb, 0x5a, 0xd1,
+	0xeb, 0x08, 0x19, 0x29, 0x4a, 0x44, 0x51, 0x00, 0x1b, 0xec, 0x18, 0x07, 0xb6, 0x89, 0x3d, 0xdb,
+	0xb4, 0xe8, 0x68, 0xe4, 0x70, 0x4e, 0x08, 0x33, 0x8f, 0xc4, 0xdb, 0x5c, 0xca, 0xa3, 0xa2, 0x69,
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+	0x39, 0x57, 0x41, 0x56, 0x27, 0xd1, 0x90, 0xcf, 0x1c, 0x7e, 0x6c, 0x07, 0xf8, 0x0c, 0xbb, 0x61,
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+	0x88, 0xc7, 0x95, 0xad, 0xb5, 0x90, 0xd1, 0x8e, 0xe9, 0xa8, 0x01, 0x73, 0x03, 0xec, 0x8a, 0x95,
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+	0xd7, 0x61, 0x81, 0xbc, 0x77, 0x78, 0xd8, 0xae, 0xe7, 0x24, 0x6b, 0x5e, 0x10, 0x44, 0x6d, 0x6a,
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+	0x24, 0x21, 0xd4, 0x4b, 0x51, 0xcc, 0x8b, 0x33, 0x42, 0x34, 0x97, 0xb0, 0x25, 0xa4, 0xd0, 0xe1,
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+	0x2e, 0xa4, 0xdd, 0xbc, 0x05, 0x95, 0x49, 0x73, 0x8b, 0xd2, 0xdc, 0xb2, 0x9f, 0xb6, 0xf3, 0xd3,
+	0x5d, 0x36, 0x1d, 0xb5, 0xd9, 0x8c, 0xa8, 0x69, 0x1f, 0xa0, 0x7a, 0x61, 0x2e, 0x8b, 0x4a, 0x08,
+	0x6b, 0xd7, 0x3d, 0x57, 0xab, 0x40, 0xd8, 0xe6, 0xe6, 0x8d, 0x6a, 0x44, 0x0f, 0x57, 0x00, 0x3b,
+	0xd3, 0x9c, 0x7c, 0xa6, 0x39, 0x91, 0x1f, 0x0a, 0x89, 0x1f, 0xb4, 0xaf, 0xa1, 0x9e, 0x72, 0xa7,
+	0x7a, 0xe1, 0x5d, 0xa8, 0xa5, 0xda, 0x95, 0xa9, 0xda, 0x71, 0x41, 0x2e, 0xe0, 0x93, 0x60, 0xed,
+	0x4b, 0xa8, 0x4c, 0xf4, 0x07, 0x71, 0xc9, 0x89, 0xe3, 0x85, 0xd6, 0x56, 0x0c, 0xf9, 0x2d, 0x68,
+	0x36, 0xe6, 0x58, 0x75, 0x25, 0xf9, 0x7d, 0xef, 0xcf, 0x3c, 0xcc, 0xf4, 0xa9, 0xef, 0x58, 0xa8,
+	0x04, 0x73, 0x87, 0xdd, 0x17, 0xdd, 0xfd, 0xef, 0xba, 0xb5, 0xff, 0xa0, 0x0d, 0x58, 0x6f, 0x75,
+	0xf4, 0xf6, 0x7e, 0xd7, 0x6c, 0xed, 0xed, 0xb7, 0x5f, 0x98, 0xbb, 0x7a, 0x6f, 0xd7, 0xd4, 0xbb,
+	0xdd, 0xfd, 0xc3, 0x6e, 0xbb, 0x53, 0xcb, 0xa1, 0x06, 0x2c, 0x4f, 0xf0, 0x8d, 0xce, 0xab, 0xc3,
+	0x4e, 0xaf, 0x5f, 0xcb, 0xa3, 0x3b, 0xb0, 0x95, 0xc5, 0x31, 0x5b, 0x6f, 0xcc, 0xde, 0xde, 0x7e,
+	0xdf, 0xec, 0x1e, 0xbe, 0x6c, 0x75, 0x8c, 0x5a, 0x01, 0xad, 0xc1, 0xca, 0x05, 0x60, 0xef, 0x60,
+	0xbf, 0xdb, 0xeb, 0xd4, 0x8a, 0xe8, 0xbf, 0xb0, 0xd9, 0x36, 0xde, 0xf4, 0xfa, 0xfa, 0xde, 0xde,
+	0xf3, 0x1f, 0x3a, 0x4f, 0xcd, 0x5e, 0x5f, 0xef, 0x77, 0x2e, 0xd8, 0x30, 0x23, 0x6c, 0xcc, 0x40,
+	0x45, 0x96, 0xcc, 0xa2, 0x5b, 0x70, 0x3d, 0x93, 0xaf, 0xae, 0x99, 0x13, 0x0a, 0xf4, 0x76, 0xff,
+	0xf9, 0xeb, 0x4e, 0xe6, 0x05, 0xf3, 0xe2, 0x91, 0x13, 0xfc, 0x48, 0xf5, 0x82, 0xb0, 0xfd, 0x02,
+	0x47, 0x29, 0x85, 0xc1, 0xac, 0xfc, 0x6f, 0x79, 0xfc, 0x4f, 0x00, 0x00, 0x00, 0xff, 0xff, 0x6c,
+	0xd7, 0x30, 0x26, 0x5e, 0x0f, 0x00, 0x00,
 }
diff --git a/proto/beacon/p2p/v1/messages.proto b/proto/beacon/p2p/v1/messages.proto
index 9ec311caca..3893e6ad00 100644
--- a/proto/beacon/p2p/v1/messages.proto
+++ b/proto/beacon/p2p/v1/messages.proto
@@ -64,17 +64,15 @@ message CrystallizedState {
   uint64 justified_streak = 2;
   uint64 last_justified_slot = 3;
   uint64 last_finalized_slot = 4;
-  uint64 dynasty = 5;
-  bytes dynasty_seed = 6;
-  uint64 dynasty_start_slot = 7;
-  repeated CrosslinkRecord crosslinks = 8;
-  repeated ValidatorRecord validators = 9;
-  repeated ShardAndCommitteeArray shard_and_committees_for_slots = 10;
-  repeated uint32 deposits_penalized_in_period = 11;
-  bytes validator_set_delta_hash_chain = 12;
-  uint32 pre_fork_version = 13;
-  uint32 post_fork_version = 14;
-  uint64 fork_slot_number =15;
+  uint64 validator_set_change_slot = 5;
+  repeated CrosslinkRecord crosslinks = 6;
+  repeated ValidatorRecord validators = 7;
+  repeated ShardAndCommitteeArray shard_and_committees_for_slots = 8;
+  repeated uint32 deposits_penalized_in_period = 9;
+  bytes validator_set_delta_hash_chain = 10;
+  uint32 pre_fork_version = 11;
+  uint32 post_fork_version = 12;
+  uint64 fork_slot_number =13;
 }
 
 message ShardAndCommitteeArray {
@@ -136,7 +134,7 @@ message AttestationSignedData {
 }
 
 message CrosslinkRecord {
-  uint64 dynasty = 1;
+  bool recently_changed = 1;
   bytes shard_block_hash = 2;
   uint64 slot = 3;
 }