diff --git a/abci/example/kvstore/helpers.go b/abci/example/kvstore/helpers.go
index 0e69fab9f..bb086dec0 100644
--- a/abci/example/kvstore/helpers.go
+++ b/abci/example/kvstore/helpers.go
@@ -7,12 +7,10 @@ import (
 
 // RandVal creates one random validator, with a key derived
 // from the input value
-func RandVal(i int) types.Validator {
-	addr := cmn.RandBytes(20)
+func RandVal(i int) types.ValidatorUpdate {
 	pubkey := cmn.RandBytes(32)
 	power := cmn.RandUint16() + 1
-	v := types.Ed25519Validator(pubkey, int64(power))
-	v.Address = addr
+	v := types.Ed25519ValidatorUpdate(pubkey, int64(power))
 	return v
 }
 
@@ -20,8 +18,8 @@ func RandVal(i int) types.Validator {
 // the application. Note that the keys are deterministically
 // derived from the index in the array, while the power is
 // random (Change this if not desired)
-func RandVals(cnt int) []types.Validator {
-	res := make([]types.Validator, cnt)
+func RandVals(cnt int) []types.ValidatorUpdate {
+	res := make([]types.ValidatorUpdate, cnt)
 	for i := 0; i < cnt; i++ {
 		res[i] = RandVal(i)
 	}
diff --git a/abci/example/kvstore/kvstore_test.go b/abci/example/kvstore/kvstore_test.go
index 33e67aaad..a18fb8d3c 100644
--- a/abci/example/kvstore/kvstore_test.go
+++ b/abci/example/kvstore/kvstore_test.go
@@ -122,11 +122,11 @@ func TestValUpdates(t *testing.T) {
 	vals1, vals2 := vals[:nInit], kvstore.Validators()
 	valsEqual(t, vals1, vals2)
 
-	var v1, v2, v3 types.Validator
+	var v1, v2, v3 types.ValidatorUpdate
 
 	// add some validators
 	v1, v2 = vals[nInit], vals[nInit+1]
-	diff := []types.Validator{v1, v2}
+	diff := []types.ValidatorUpdate{v1, v2}
 	tx1 := MakeValSetChangeTx(v1.PubKey, v1.Power)
 	tx2 := MakeValSetChangeTx(v2.PubKey, v2.Power)
 
@@ -140,7 +140,7 @@ func TestValUpdates(t *testing.T) {
 	v1.Power = 0
 	v2.Power = 0
 	v3.Power = 0
-	diff = []types.Validator{v1, v2, v3}
+	diff = []types.ValidatorUpdate{v1, v2, v3}
 	tx1 = MakeValSetChangeTx(v1.PubKey, v1.Power)
 	tx2 = MakeValSetChangeTx(v2.PubKey, v2.Power)
 	tx3 := MakeValSetChangeTx(v3.PubKey, v3.Power)
@@ -158,18 +158,18 @@ func TestValUpdates(t *testing.T) {
 	} else {
 		v1.Power = 5
 	}
-	diff = []types.Validator{v1}
+	diff = []types.ValidatorUpdate{v1}
 	tx1 = MakeValSetChangeTx(v1.PubKey, v1.Power)
 
 	makeApplyBlock(t, kvstore, 3, diff, tx1)
 
-	vals1 = append([]types.Validator{v1}, vals1[1:]...)
+	vals1 = append([]types.ValidatorUpdate{v1}, vals1[1:]...)
 	vals2 = kvstore.Validators()
 	valsEqual(t, vals1, vals2)
 
 }
 
-func makeApplyBlock(t *testing.T, kvstore types.Application, heightInt int, diff []types.Validator, txs ...[]byte) {
+func makeApplyBlock(t *testing.T, kvstore types.Application, heightInt int, diff []types.ValidatorUpdate, txs ...[]byte) {
 	// make and apply block
 	height := int64(heightInt)
 	hash := []byte("foo")
@@ -191,12 +191,12 @@ func makeApplyBlock(t *testing.T, kvstore types.Application, heightInt int, diff
 }
 
 // order doesn't matter
-func valsEqual(t *testing.T, vals1, vals2 []types.Validator) {
+func valsEqual(t *testing.T, vals1, vals2 []types.ValidatorUpdate) {
 	if len(vals1) != len(vals2) {
 		t.Fatalf("vals dont match in len. got %d, expected %d", len(vals2), len(vals1))
 	}
-	sort.Sort(types.Validators(vals1))
-	sort.Sort(types.Validators(vals2))
+	sort.Sort(types.ValidatorUpdates(vals1))
+	sort.Sort(types.ValidatorUpdates(vals2))
 	for i, v1 := range vals1 {
 		v2 := vals2[i]
 		if !bytes.Equal(v1.PubKey.Data, v2.PubKey.Data) ||
diff --git a/abci/example/kvstore/persistent_kvstore.go b/abci/example/kvstore/persistent_kvstore.go
index b8a2299a6..f969eebfe 100644
--- a/abci/example/kvstore/persistent_kvstore.go
+++ b/abci/example/kvstore/persistent_kvstore.go
@@ -25,7 +25,7 @@ type PersistentKVStoreApplication struct {
 	app *KVStoreApplication
 
 	// validator set
-	ValUpdates []types.Validator
+	ValUpdates []types.ValidatorUpdate
 
 	logger log.Logger
 }
@@ -101,7 +101,7 @@ func (app *PersistentKVStoreApplication) InitChain(req types.RequestInitChain) t
 // Track the block hash and header information
 func (app *PersistentKVStoreApplication) BeginBlock(req types.RequestBeginBlock) types.ResponseBeginBlock {
 	// reset valset changes
-	app.ValUpdates = make([]types.Validator, 0)
+	app.ValUpdates = make([]types.ValidatorUpdate, 0)
 	return types.ResponseBeginBlock{}
 }
 
@@ -113,11 +113,11 @@ func (app *PersistentKVStoreApplication) EndBlock(req types.RequestEndBlock) typ
 //---------------------------------------------
 // update validators
 
-func (app *PersistentKVStoreApplication) Validators() (validators []types.Validator) {
+func (app *PersistentKVStoreApplication) Validators() (validators []types.ValidatorUpdate) {
 	itr := app.app.state.db.Iterator(nil, nil)
 	for ; itr.Valid(); itr.Next() {
 		if isValidatorTx(itr.Key()) {
-			validator := new(types.Validator)
+			validator := new(types.ValidatorUpdate)
 			err := types.ReadMessage(bytes.NewBuffer(itr.Value()), validator)
 			if err != nil {
 				panic(err)
@@ -167,11 +167,11 @@ func (app *PersistentKVStoreApplication) execValidatorTx(tx []byte) types.Respon
 	}
 
 	// update
-	return app.updateValidator(types.Ed25519Validator(pubkey, int64(power)))
+	return app.updateValidator(types.Ed25519ValidatorUpdate(pubkey, int64(power)))
 }
 
 // add, update, or remove a validator
-func (app *PersistentKVStoreApplication) updateValidator(v types.Validator) types.ResponseDeliverTx {
+func (app *PersistentKVStoreApplication) updateValidator(v types.ValidatorUpdate) types.ResponseDeliverTx {
 	key := []byte("val:" + string(v.PubKey.Data))
 	if v.Power == 0 {
 		// remove validator
diff --git a/abci/tests/server/client.go b/abci/tests/server/client.go
index f67297cd7..5daa1e6af 100644
--- a/abci/tests/server/client.go
+++ b/abci/tests/server/client.go
@@ -12,11 +12,11 @@ import (
 
 func InitChain(client abcicli.Client) error {
 	total := 10
-	vals := make([]types.Validator, total)
+	vals := make([]types.ValidatorUpdate, total)
 	for i := 0; i < total; i++ {
 		pubkey := cmn.RandBytes(33)
 		power := cmn.RandInt()
-		vals[i] = types.Ed25519Validator(pubkey, int64(power))
+		vals[i] = types.Ed25519ValidatorUpdate(pubkey, int64(power))
 	}
 	_, err := client.InitChainSync(types.RequestInitChain{
 		Validators: vals,
diff --git a/abci/types/pubkey.go b/abci/types/pubkey.go
index e5cd5fbf3..46cd8c5e8 100644
--- a/abci/types/pubkey.go
+++ b/abci/types/pubkey.go
@@ -4,8 +4,8 @@ const (
 	PubKeyEd25519 = "ed25519"
 )
 
-func Ed25519Validator(pubkey []byte, power int64) Validator {
-	return Validator{
+func Ed25519ValidatorUpdate(pubkey []byte, power int64) ValidatorUpdate {
+	return ValidatorUpdate{
 		// Address:
 		PubKey: PubKey{
 			Type: PubKeyEd25519,
diff --git a/abci/types/types.pb.go b/abci/types/types.pb.go
index a609d677b..773754c70 100644
--- a/abci/types/types.pb.go
+++ b/abci/types/types.pb.go
@@ -42,7 +42,8 @@
 		BlockID
 		PartSetHeader
 		Validator
-		SigningValidator
+		ValidatorUpdate
+		VoteInfo
 		PubKey
 		Evidence
 */
@@ -551,11 +552,11 @@ func (m *RequestSetOption) GetValue() string {
 }
 
 type RequestInitChain struct {
-	Time            time.Time        `protobuf:"bytes,1,opt,name=time,stdtime" json:"time"`
-	ChainId         string           `protobuf:"bytes,2,opt,name=chain_id,json=chainId,proto3" json:"chain_id,omitempty"`
-	ConsensusParams *ConsensusParams `protobuf:"bytes,3,opt,name=consensus_params,json=consensusParams" json:"consensus_params,omitempty"`
-	Validators      []Validator      `protobuf:"bytes,4,rep,name=validators" json:"validators"`
-	AppStateBytes   []byte           `protobuf:"bytes,5,opt,name=app_state_bytes,json=appStateBytes,proto3" json:"app_state_bytes,omitempty"`
+	Time            time.Time         `protobuf:"bytes,1,opt,name=time,stdtime" json:"time"`
+	ChainId         string            `protobuf:"bytes,2,opt,name=chain_id,json=chainId,proto3" json:"chain_id,omitempty"`
+	ConsensusParams *ConsensusParams  `protobuf:"bytes,3,opt,name=consensus_params,json=consensusParams" json:"consensus_params,omitempty"`
+	Validators      []ValidatorUpdate `protobuf:"bytes,4,rep,name=validators" json:"validators"`
+	AppStateBytes   []byte            `protobuf:"bytes,5,opt,name=app_state_bytes,json=appStateBytes,proto3" json:"app_state_bytes,omitempty"`
 }
 
 func (m *RequestInitChain) Reset()                    { *m = RequestInitChain{} }
@@ -584,7 +585,7 @@ func (m *RequestInitChain) GetConsensusParams() *ConsensusParams {
 	return nil
 }
 
-func (m *RequestInitChain) GetValidators() []Validator {
+func (m *RequestInitChain) GetValidators() []ValidatorUpdate {
 	if m != nil {
 		return m.Validators
 	}
@@ -1285,8 +1286,8 @@ func (m *ResponseSetOption) GetInfo() string {
 }
 
 type ResponseInitChain struct {
-	ConsensusParams *ConsensusParams `protobuf:"bytes,1,opt,name=consensus_params,json=consensusParams" json:"consensus_params,omitempty"`
-	Validators      []Validator      `protobuf:"bytes,2,rep,name=validators" json:"validators"`
+	ConsensusParams *ConsensusParams  `protobuf:"bytes,1,opt,name=consensus_params,json=consensusParams" json:"consensus_params,omitempty"`
+	Validators      []ValidatorUpdate `protobuf:"bytes,2,rep,name=validators" json:"validators"`
 }
 
 func (m *ResponseInitChain) Reset()                    { *m = ResponseInitChain{} }
@@ -1301,7 +1302,7 @@ func (m *ResponseInitChain) GetConsensusParams() *ConsensusParams {
 	return nil
 }
 
-func (m *ResponseInitChain) GetValidators() []Validator {
+func (m *ResponseInitChain) GetValidators() []ValidatorUpdate {
 	if m != nil {
 		return m.Validators
 	}
@@ -1526,9 +1527,9 @@ func (m *ResponseDeliverTx) GetTags() []common.KVPair {
 }
 
 type ResponseEndBlock struct {
-	ValidatorUpdates      []Validator      `protobuf:"bytes,1,rep,name=validator_updates,json=validatorUpdates" json:"validator_updates"`
-	ConsensusParamUpdates *ConsensusParams `protobuf:"bytes,2,opt,name=consensus_param_updates,json=consensusParamUpdates" json:"consensus_param_updates,omitempty"`
-	Tags                  []common.KVPair  `protobuf:"bytes,3,rep,name=tags" json:"tags,omitempty"`
+	ValidatorUpdates      []ValidatorUpdate `protobuf:"bytes,1,rep,name=validator_updates,json=validatorUpdates" json:"validator_updates"`
+	ConsensusParamUpdates *ConsensusParams  `protobuf:"bytes,2,opt,name=consensus_param_updates,json=consensusParamUpdates" json:"consensus_param_updates,omitempty"`
+	Tags                  []common.KVPair   `protobuf:"bytes,3,rep,name=tags" json:"tags,omitempty"`
 }
 
 func (m *ResponseEndBlock) Reset()                    { *m = ResponseEndBlock{} }
@@ -1536,7 +1537,7 @@ func (m *ResponseEndBlock) String() string            { return proto.CompactText
 func (*ResponseEndBlock) ProtoMessage()               {}
 func (*ResponseEndBlock) Descriptor() ([]byte, []int) { return fileDescriptorTypes, []int{23} }
 
-func (m *ResponseEndBlock) GetValidatorUpdates() []Validator {
+func (m *ResponseEndBlock) GetValidatorUpdates() []ValidatorUpdate {
 	if m != nil {
 		return m.ValidatorUpdates
 	}
@@ -1686,8 +1687,7 @@ func (m *BlockGossip) GetBlockPartSizeBytes() int32 {
 }
 
 type LastCommitInfo struct {
-	CommitRound int32              `protobuf:"varint,1,opt,name=commit_round,json=commitRound,proto3" json:"commit_round,omitempty"`
-	Validators  []SigningValidator `protobuf:"bytes,2,rep,name=validators" json:"validators"`
+	CommitVotes []VoteInfo `protobuf:"bytes,1,rep,name=commit_votes,json=commitVotes" json:"commit_votes"`
 }
 
 func (m *LastCommitInfo) Reset()                    { *m = LastCommitInfo{} }
@@ -1695,16 +1695,9 @@ func (m *LastCommitInfo) String() string            { return proto.CompactTextSt
 func (*LastCommitInfo) ProtoMessage()               {}
 func (*LastCommitInfo) Descriptor() ([]byte, []int) { return fileDescriptorTypes, []int{29} }
 
-func (m *LastCommitInfo) GetCommitRound() int32 {
+func (m *LastCommitInfo) GetCommitVotes() []VoteInfo {
 	if m != nil {
-		return m.CommitRound
-	}
-	return 0
-}
-
-func (m *LastCommitInfo) GetValidators() []SigningValidator {
-	if m != nil {
-		return m.Validators
+		return m.CommitVotes
 	}
 	return nil
 }
@@ -1893,7 +1886,6 @@ func (m *PartSetHeader) GetHash() []byte {
 // Validator
 type Validator struct {
 	Address []byte `protobuf:"bytes,1,opt,name=address,proto3" json:"address,omitempty"`
-	PubKey  PubKey `protobuf:"bytes,2,opt,name=pub_key,json=pubKey" json:"pub_key"`
 	Power   int64  `protobuf:"varint,3,opt,name=power,proto3" json:"power,omitempty"`
 }
 
@@ -1909,45 +1901,71 @@ func (m *Validator) GetAddress() []byte {
 	return nil
 }
 
-func (m *Validator) GetPubKey() PubKey {
+func (m *Validator) GetPower() int64 {
+	if m != nil {
+		return m.Power
+	}
+	return 0
+}
+
+// ValidatorUpdate
+type ValidatorUpdate struct {
+	PubKey PubKey `protobuf:"bytes,1,opt,name=pub_key,json=pubKey" json:"pub_key"`
+	Power  int64  `protobuf:"varint,2,opt,name=power,proto3" json:"power,omitempty"`
+}
+
+func (m *ValidatorUpdate) Reset()                    { *m = ValidatorUpdate{} }
+func (m *ValidatorUpdate) String() string            { return proto.CompactTextString(m) }
+func (*ValidatorUpdate) ProtoMessage()               {}
+func (*ValidatorUpdate) Descriptor() ([]byte, []int) { return fileDescriptorTypes, []int{34} }
+
+func (m *ValidatorUpdate) GetPubKey() PubKey {
 	if m != nil {
 		return m.PubKey
 	}
 	return PubKey{}
 }
 
-func (m *Validator) GetPower() int64 {
+func (m *ValidatorUpdate) GetPower() int64 {
 	if m != nil {
 		return m.Power
 	}
 	return 0
 }
 
-// Validator with an extra bool
-type SigningValidator struct {
+// VoteInfo
+type VoteInfo struct {
 	Validator       Validator `protobuf:"bytes,1,opt,name=validator" json:"validator"`
 	SignedLastBlock bool      `protobuf:"varint,2,opt,name=signed_last_block,json=signedLastBlock,proto3" json:"signed_last_block,omitempty"`
+	CommitRound     int64     `protobuf:"varint,3,opt,name=commit_round,json=commitRound,proto3" json:"commit_round,omitempty"`
 }
 
-func (m *SigningValidator) Reset()                    { *m = SigningValidator{} }
-func (m *SigningValidator) String() string            { return proto.CompactTextString(m) }
-func (*SigningValidator) ProtoMessage()               {}
-func (*SigningValidator) Descriptor() ([]byte, []int) { return fileDescriptorTypes, []int{34} }
+func (m *VoteInfo) Reset()                    { *m = VoteInfo{} }
+func (m *VoteInfo) String() string            { return proto.CompactTextString(m) }
+func (*VoteInfo) ProtoMessage()               {}
+func (*VoteInfo) Descriptor() ([]byte, []int) { return fileDescriptorTypes, []int{35} }
 
-func (m *SigningValidator) GetValidator() Validator {
+func (m *VoteInfo) GetValidator() Validator {
 	if m != nil {
 		return m.Validator
 	}
 	return Validator{}
 }
 
-func (m *SigningValidator) GetSignedLastBlock() bool {
+func (m *VoteInfo) GetSignedLastBlock() bool {
 	if m != nil {
 		return m.SignedLastBlock
 	}
 	return false
 }
 
+func (m *VoteInfo) GetCommitRound() int64 {
+	if m != nil {
+		return m.CommitRound
+	}
+	return 0
+}
+
 type PubKey struct {
 	Type string `protobuf:"bytes,1,opt,name=type,proto3" json:"type,omitempty"`
 	Data []byte `protobuf:"bytes,2,opt,name=data,proto3" json:"data,omitempty"`
@@ -1956,7 +1974,7 @@ type PubKey struct {
 func (m *PubKey) Reset()                    { *m = PubKey{} }
 func (m *PubKey) String() string            { return proto.CompactTextString(m) }
 func (*PubKey) ProtoMessage()               {}
-func (*PubKey) Descriptor() ([]byte, []int) { return fileDescriptorTypes, []int{35} }
+func (*PubKey) Descriptor() ([]byte, []int) { return fileDescriptorTypes, []int{36} }
 
 func (m *PubKey) GetType() string {
 	if m != nil {
@@ -1983,7 +2001,7 @@ type Evidence struct {
 func (m *Evidence) Reset()                    { *m = Evidence{} }
 func (m *Evidence) String() string            { return proto.CompactTextString(m) }
 func (*Evidence) ProtoMessage()               {}
-func (*Evidence) Descriptor() ([]byte, []int) { return fileDescriptorTypes, []int{36} }
+func (*Evidence) Descriptor() ([]byte, []int) { return fileDescriptorTypes, []int{37} }
 
 func (m *Evidence) GetType() string {
 	if m != nil {
@@ -2089,8 +2107,10 @@ func init() {
 	golang_proto.RegisterType((*PartSetHeader)(nil), "types.PartSetHeader")
 	proto.RegisterType((*Validator)(nil), "types.Validator")
 	golang_proto.RegisterType((*Validator)(nil), "types.Validator")
-	proto.RegisterType((*SigningValidator)(nil), "types.SigningValidator")
-	golang_proto.RegisterType((*SigningValidator)(nil), "types.SigningValidator")
+	proto.RegisterType((*ValidatorUpdate)(nil), "types.ValidatorUpdate")
+	golang_proto.RegisterType((*ValidatorUpdate)(nil), "types.ValidatorUpdate")
+	proto.RegisterType((*VoteInfo)(nil), "types.VoteInfo")
+	golang_proto.RegisterType((*VoteInfo)(nil), "types.VoteInfo")
 	proto.RegisterType((*PubKey)(nil), "types.PubKey")
 	golang_proto.RegisterType((*PubKey)(nil), "types.PubKey")
 	proto.RegisterType((*Evidence)(nil), "types.Evidence")
@@ -3535,14 +3555,11 @@ func (this *LastCommitInfo) Equal(that interface{}) bool {
 	} else if this == nil {
 		return false
 	}
-	if this.CommitRound != that1.CommitRound {
+	if len(this.CommitVotes) != len(that1.CommitVotes) {
 		return false
 	}
-	if len(this.Validators) != len(that1.Validators) {
-		return false
-	}
-	for i := range this.Validators {
-		if !this.Validators[i].Equal(&that1.Validators[i]) {
+	for i := range this.CommitVotes {
+		if !this.CommitVotes[i].Equal(&that1.CommitVotes[i]) {
 			return false
 		}
 	}
@@ -3690,6 +3707,30 @@ func (this *Validator) Equal(that interface{}) bool {
 	if !bytes.Equal(this.Address, that1.Address) {
 		return false
 	}
+	if this.Power != that1.Power {
+		return false
+	}
+	return true
+}
+func (this *ValidatorUpdate) Equal(that interface{}) bool {
+	if that == nil {
+		return this == nil
+	}
+
+	that1, ok := that.(*ValidatorUpdate)
+	if !ok {
+		that2, ok := that.(ValidatorUpdate)
+		if ok {
+			that1 = &that2
+		} else {
+			return false
+		}
+	}
+	if that1 == nil {
+		return this == nil
+	} else if this == nil {
+		return false
+	}
 	if !this.PubKey.Equal(&that1.PubKey) {
 		return false
 	}
@@ -3698,14 +3739,14 @@ func (this *Validator) Equal(that interface{}) bool {
 	}
 	return true
 }
-func (this *SigningValidator) Equal(that interface{}) bool {
+func (this *VoteInfo) Equal(that interface{}) bool {
 	if that == nil {
 		return this == nil
 	}
 
-	that1, ok := that.(*SigningValidator)
+	that1, ok := that.(*VoteInfo)
 	if !ok {
-		that2, ok := that.(SigningValidator)
+		that2, ok := that.(VoteInfo)
 		if ok {
 			that1 = &that2
 		} else {
@@ -3723,6 +3764,9 @@ func (this *SigningValidator) Equal(that interface{}) bool {
 	if this.SignedLastBlock != that1.SignedLastBlock {
 		return false
 	}
+	if this.CommitRound != that1.CommitRound {
+		return false
+	}
 	return true
 }
 func (this *PubKey) Equal(that interface{}) bool {
@@ -5532,14 +5576,9 @@ func (m *LastCommitInfo) MarshalTo(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
-	if m.CommitRound != 0 {
-		dAtA[i] = 0x8
-		i++
-		i = encodeVarintTypes(dAtA, i, uint64(m.CommitRound))
-	}
-	if len(m.Validators) > 0 {
-		for _, msg := range m.Validators {
-			dAtA[i] = 0x12
+	if len(m.CommitVotes) > 0 {
+		for _, msg := range m.CommitVotes {
+			dAtA[i] = 0xa
 			i++
 			i = encodeVarintTypes(dAtA, i, uint64(msg.Size()))
 			n, err := msg.MarshalTo(dAtA[i:])
@@ -5743,7 +5782,30 @@ func (m *Validator) MarshalTo(dAtA []byte) (int, error) {
 		i = encodeVarintTypes(dAtA, i, uint64(len(m.Address)))
 		i += copy(dAtA[i:], m.Address)
 	}
-	dAtA[i] = 0x12
+	if m.Power != 0 {
+		dAtA[i] = 0x18
+		i++
+		i = encodeVarintTypes(dAtA, i, uint64(m.Power))
+	}
+	return i, nil
+}
+
+func (m *ValidatorUpdate) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *ValidatorUpdate) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	dAtA[i] = 0xa
 	i++
 	i = encodeVarintTypes(dAtA, i, uint64(m.PubKey.Size()))
 	n38, err := m.PubKey.MarshalTo(dAtA[i:])
@@ -5752,14 +5814,14 @@ func (m *Validator) MarshalTo(dAtA []byte) (int, error) {
 	}
 	i += n38
 	if m.Power != 0 {
-		dAtA[i] = 0x18
+		dAtA[i] = 0x10
 		i++
 		i = encodeVarintTypes(dAtA, i, uint64(m.Power))
 	}
 	return i, nil
 }
 
-func (m *SigningValidator) Marshal() (dAtA []byte, err error) {
+func (m *VoteInfo) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
 	n, err := m.MarshalTo(dAtA)
@@ -5769,7 +5831,7 @@ func (m *SigningValidator) Marshal() (dAtA []byte, err error) {
 	return dAtA[:n], nil
 }
 
-func (m *SigningValidator) MarshalTo(dAtA []byte) (int, error) {
+func (m *VoteInfo) MarshalTo(dAtA []byte) (int, error) {
 	var i int
 	_ = i
 	var l int
@@ -5792,6 +5854,11 @@ func (m *SigningValidator) MarshalTo(dAtA []byte) (int, error) {
 		}
 		i++
 	}
+	if m.CommitRound != 0 {
+		dAtA[i] = 0x18
+		i++
+		i = encodeVarintTypes(dAtA, i, uint64(m.CommitRound))
+	}
 	return i, nil
 }
 
@@ -6013,9 +6080,9 @@ func NewPopulatedRequestInitChain(r randyTypes, easy bool) *RequestInitChain {
 	}
 	if r.Intn(10) != 0 {
 		v2 := r.Intn(5)
-		this.Validators = make([]Validator, v2)
+		this.Validators = make([]ValidatorUpdate, v2)
 		for i := 0; i < v2; i++ {
-			v3 := NewPopulatedValidator(r, easy)
+			v3 := NewPopulatedValidatorUpdate(r, easy)
 			this.Validators[i] = *v3
 		}
 	}
@@ -6265,9 +6332,9 @@ func NewPopulatedResponseInitChain(r randyTypes, easy bool) *ResponseInitChain {
 	}
 	if r.Intn(10) != 0 {
 		v14 := r.Intn(5)
-		this.Validators = make([]Validator, v14)
+		this.Validators = make([]ValidatorUpdate, v14)
 		for i := 0; i < v14; i++ {
-			v15 := NewPopulatedValidator(r, easy)
+			v15 := NewPopulatedValidatorUpdate(r, easy)
 			this.Validators[i] = *v15
 		}
 	}
@@ -6390,9 +6457,9 @@ func NewPopulatedResponseEndBlock(r randyTypes, easy bool) *ResponseEndBlock {
 	this := &ResponseEndBlock{}
 	if r.Intn(10) != 0 {
 		v27 := r.Intn(5)
-		this.ValidatorUpdates = make([]Validator, v27)
+		this.ValidatorUpdates = make([]ValidatorUpdate, v27)
 		for i := 0; i < v27; i++ {
-			v28 := NewPopulatedValidator(r, easy)
+			v28 := NewPopulatedValidatorUpdate(r, easy)
 			this.ValidatorUpdates[i] = *v28
 		}
 	}
@@ -6487,16 +6554,12 @@ func NewPopulatedBlockGossip(r randyTypes, easy bool) *BlockGossip {
 
 func NewPopulatedLastCommitInfo(r randyTypes, easy bool) *LastCommitInfo {
 	this := &LastCommitInfo{}
-	this.CommitRound = int32(r.Int31())
-	if r.Intn(2) == 0 {
-		this.CommitRound *= -1
-	}
 	if r.Intn(10) != 0 {
 		v32 := r.Intn(5)
-		this.Validators = make([]SigningValidator, v32)
+		this.CommitVotes = make([]VoteInfo, v32)
 		for i := 0; i < v32; i++ {
-			v33 := NewPopulatedSigningValidator(r, easy)
-			this.Validators[i] = *v33
+			v33 := NewPopulatedVoteInfo(r, easy)
+			this.CommitVotes[i] = *v33
 		}
 	}
 	if !easy && r.Intn(10) != 0 {
@@ -6610,6 +6673,17 @@ func NewPopulatedValidator(r randyTypes, easy bool) *Validator {
 	for i := 0; i < v48; i++ {
 		this.Address[i] = byte(r.Intn(256))
 	}
+	this.Power = int64(r.Int63())
+	if r.Intn(2) == 0 {
+		this.Power *= -1
+	}
+	if !easy && r.Intn(10) != 0 {
+	}
+	return this
+}
+
+func NewPopulatedValidatorUpdate(r randyTypes, easy bool) *ValidatorUpdate {
+	this := &ValidatorUpdate{}
 	v49 := NewPopulatedPubKey(r, easy)
 	this.PubKey = *v49
 	this.Power = int64(r.Int63())
@@ -6621,11 +6695,15 @@ func NewPopulatedValidator(r randyTypes, easy bool) *Validator {
 	return this
 }
 
-func NewPopulatedSigningValidator(r randyTypes, easy bool) *SigningValidator {
-	this := &SigningValidator{}
+func NewPopulatedVoteInfo(r randyTypes, easy bool) *VoteInfo {
+	this := &VoteInfo{}
 	v50 := NewPopulatedValidator(r, easy)
 	this.Validator = *v50
 	this.SignedLastBlock = bool(bool(r.Intn(2) == 0))
+	this.CommitRound = int64(r.Int63())
+	if r.Intn(2) == 0 {
+		this.CommitRound *= -1
+	}
 	if !easy && r.Intn(10) != 0 {
 	}
 	return this
@@ -7384,11 +7462,8 @@ func (m *BlockGossip) Size() (n int) {
 func (m *LastCommitInfo) Size() (n int) {
 	var l int
 	_ = l
-	if m.CommitRound != 0 {
-		n += 1 + sovTypes(uint64(m.CommitRound))
-	}
-	if len(m.Validators) > 0 {
-		for _, e := range m.Validators {
+	if len(m.CommitVotes) > 0 {
+		for _, e := range m.CommitVotes {
 			l = e.Size()
 			n += 1 + l + sovTypes(uint64(l))
 		}
@@ -7487,6 +7562,15 @@ func (m *Validator) Size() (n int) {
 	if l > 0 {
 		n += 1 + l + sovTypes(uint64(l))
 	}
+	if m.Power != 0 {
+		n += 1 + sovTypes(uint64(m.Power))
+	}
+	return n
+}
+
+func (m *ValidatorUpdate) Size() (n int) {
+	var l int
+	_ = l
 	l = m.PubKey.Size()
 	n += 1 + l + sovTypes(uint64(l))
 	if m.Power != 0 {
@@ -7495,7 +7579,7 @@ func (m *Validator) Size() (n int) {
 	return n
 }
 
-func (m *SigningValidator) Size() (n int) {
+func (m *VoteInfo) Size() (n int) {
 	var l int
 	_ = l
 	l = m.Validator.Size()
@@ -7503,6 +7587,9 @@ func (m *SigningValidator) Size() (n int) {
 	if m.SignedLastBlock {
 		n += 2
 	}
+	if m.CommitRound != 0 {
+		n += 1 + sovTypes(uint64(m.CommitRound))
+	}
 	return n
 }
 
@@ -8418,7 +8505,7 @@ func (m *RequestInitChain) Unmarshal(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Validators = append(m.Validators, Validator{})
+			m.Validators = append(m.Validators, ValidatorUpdate{})
 			if err := m.Validators[len(m.Validators)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
 				return err
 			}
@@ -10092,7 +10179,7 @@ func (m *ResponseInitChain) Unmarshal(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Validators = append(m.Validators, Validator{})
+			m.Validators = append(m.Validators, ValidatorUpdate{})
 			if err := m.Validators[len(m.Validators)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
 				return err
 			}
@@ -10966,7 +11053,7 @@ func (m *ResponseEndBlock) Unmarshal(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.ValidatorUpdates = append(m.ValidatorUpdates, Validator{})
+			m.ValidatorUpdates = append(m.ValidatorUpdates, ValidatorUpdate{})
 			if err := m.ValidatorUpdates[len(m.ValidatorUpdates)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
 				return err
 			}
@@ -11580,27 +11667,8 @@ func (m *LastCommitInfo) Unmarshal(dAtA []byte) error {
 		}
 		switch fieldNum {
 		case 1:
-			if wireType != 0 {
-				return fmt.Errorf("proto: wrong wireType = %d for field CommitRound", wireType)
-			}
-			m.CommitRound = 0
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return ErrIntOverflowTypes
-				}
-				if iNdEx >= l {
-					return io.ErrUnexpectedEOF
-				}
-				b := dAtA[iNdEx]
-				iNdEx++
-				m.CommitRound |= (int32(b) & 0x7F) << shift
-				if b < 0x80 {
-					break
-				}
-			}
-		case 2:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Validators", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field CommitVotes", wireType)
 			}
 			var msglen int
 			for shift := uint(0); ; shift += 7 {
@@ -11624,8 +11692,8 @@ func (m *LastCommitInfo) Unmarshal(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Validators = append(m.Validators, SigningValidator{})
-			if err := m.Validators[len(m.Validators)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+			m.CommitVotes = append(m.CommitVotes, VoteInfo{})
+			if err := m.CommitVotes[len(m.CommitVotes)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
 				return err
 			}
 			iNdEx = postIndex
@@ -12396,7 +12464,76 @@ func (m *Validator) Unmarshal(dAtA []byte) error {
 				m.Address = []byte{}
 			}
 			iNdEx = postIndex
-		case 2:
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Power", wireType)
+			}
+			m.Power = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowTypes
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Power |= (int64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		default:
+			iNdEx = preIndex
+			skippy, err := skipTypes(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthTypes
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *ValidatorUpdate) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowTypes
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: ValidatorUpdate: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: ValidatorUpdate: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
 			if wireType != 2 {
 				return fmt.Errorf("proto: wrong wireType = %d for field PubKey", wireType)
 			}
@@ -12426,7 +12563,7 @@ func (m *Validator) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
-		case 3:
+		case 2:
 			if wireType != 0 {
 				return fmt.Errorf("proto: wrong wireType = %d for field Power", wireType)
 			}
@@ -12466,7 +12603,7 @@ func (m *Validator) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
-func (m *SigningValidator) Unmarshal(dAtA []byte) error {
+func (m *VoteInfo) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
 	for iNdEx < l {
@@ -12489,10 +12626,10 @@ func (m *SigningValidator) Unmarshal(dAtA []byte) error {
 		fieldNum := int32(wire >> 3)
 		wireType := int(wire & 0x7)
 		if wireType == 4 {
-			return fmt.Errorf("proto: SigningValidator: wiretype end group for non-group")
+			return fmt.Errorf("proto: VoteInfo: wiretype end group for non-group")
 		}
 		if fieldNum <= 0 {
-			return fmt.Errorf("proto: SigningValidator: illegal tag %d (wire type %d)", fieldNum, wire)
+			return fmt.Errorf("proto: VoteInfo: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
 		case 1:
@@ -12545,6 +12682,25 @@ func (m *SigningValidator) Unmarshal(dAtA []byte) error {
 				}
 			}
 			m.SignedLastBlock = bool(v != 0)
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field CommitRound", wireType)
+			}
+			m.CommitRound = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowTypes
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.CommitRound |= (int64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipTypes(dAtA[iNdEx:])
@@ -12962,137 +13118,138 @@ func init() { proto.RegisterFile("abci/types/types.proto", fileDescriptorTypes)
 func init() { golang_proto.RegisterFile("abci/types/types.proto", fileDescriptorTypes) }
 
 var fileDescriptorTypes = []byte{
-	// 2109 bytes of a gzipped FileDescriptorProto
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+	0x95, 0x33, 0xcd, 0x16, 0x10, 0x95, 0x50, 0x4e, 0x03, 0xe1, 0xf9, 0x23, 0x47, 0xdd, 0x87, 0xca,
+	0x2c, 0x6b, 0x48, 0x39, 0x46, 0xc2, 0x91, 0x9c, 0xdf, 0xfd, 0x6c, 0x05, 0x3a, 0xfb, 0xfd, 0xfb,
+	0x87, 0xfb, 0x61, 0x38, 0xf1, 0x86, 0x14, 0xab, 0xf3, 0x1d, 0xa8, 0x62, 0xff, 0x51, 0xf2, 0xf2,
+	0xd9, 0x2b, 0x6b, 0x84, 0xc9, 0x2e, 0xac, 0x60, 0x1b, 0x42, 0xca, 0x1e, 0x40, 0x7b, 0xa5, 0xfd,
+	0xb0, 0xdc, 0x44, 0x35, 0x2a, 0x17, 0xdf, 0x41, 0x7b, 0x65, 0x4d, 0x31, 0xf9, 0x00, 0xcc, 0xb4,
+	0x81, 0x58, 0xf4, 0x1a, 0xda, 0x5b, 0xd8, 0x1e, 0x4b, 0xf9, 0xb4, 0x6e, 0x5b, 0xf4, 0xa8, 0xd7,
+	0x5b, 0xd8, 0x47, 0x92, 0x3d, 0xa8, 0xc7, 0xf5, 0x6c, 0xf9, 0x7b, 0x65, 0x6f, 0x41, 0xeb, 0x2a,
+	0xcd, 0xa3, 0x7a, 0x82, 0xb2, 0x47, 0xd5, 0x5e, 0x69, 0x7f, 0x4d, 0xee, 0x40, 0x4d, 0x17, 0x28,
+	0xa5, 0x6f, 0x96, 0xbd, 0xf2, 0x06, 0x54, 0x2a, 0x99, 0x76, 0x45, 0x8b, 0x1e, 0x7e, 0x7b, 0x0b,
+	0x1f, 0x02, 0xc8, 0x3e, 0x40, 0xa6, 0x0f, 0x58, 0xf8, 0xa2, 0xdb, 0x5b, 0xdc, 0xe0, 0x93, 0x7b,
+	0xd0, 0x48, 0x1f, 0x6d, 0xca, 0xdf, 0x68, 0x7b, 0x8b, 0x7a, 0xee, 0xfe, 0x97, 0xfe, 0xf3, 0xf7,
+	0x75, 0xe3, 0xd7, 0xe7, 0xeb, 0xc6, 0x6f, 0xcf, 0xd7, 0x8d, 0x2f, 0xce, 0xd7, 0x8d, 0x3f, 0x9c,
+	0xaf, 0x1b, 0x7f, 0x3b, 0x5f, 0x37, 0x7e, 0xf7, 0x8f, 0x75, 0x63, 0x50, 0x43, 0xf7, 0x7f, 0xf7,
+	0xbf, 0x01, 0x00, 0x00, 0xff, 0xff, 0x30, 0x52, 0xb5, 0x7b, 0x56, 0x18, 0x00, 0x00,
 }
diff --git a/abci/types/types.proto b/abci/types/types.proto
index fcec88884..a2eb65eb7 100644
--- a/abci/types/types.proto
+++ b/abci/types/types.proto
@@ -60,7 +60,7 @@ message RequestInitChain {
   google.protobuf.Timestamp time = 1  [(gogoproto.nullable)=false, (gogoproto.stdtime)=true];
   string chain_id = 2;
   ConsensusParams consensus_params = 3;
-  repeated Validator validators = 4  [(gogoproto.nullable)=false];
+  repeated ValidatorUpdate validators = 4  [(gogoproto.nullable)=false];
   bytes app_state_bytes = 5;
 }
 
@@ -143,7 +143,7 @@ message ResponseSetOption {
 
 message ResponseInitChain {
   ConsensusParams consensus_params = 1;
-  repeated Validator validators = 2 [(gogoproto.nullable)=false];
+  repeated ValidatorUpdate validators = 2 [(gogoproto.nullable)=false];
 }
 
 message ResponseQuery {
@@ -183,7 +183,7 @@ message ResponseDeliverTx {
 }
 
 message ResponseEndBlock {
-  repeated Validator validator_updates = 1 [(gogoproto.nullable)=false];
+  repeated ValidatorUpdate validator_updates = 1 [(gogoproto.nullable)=false];
   ConsensusParams consensus_param_updates = 2;
   repeated common.KVPair tags = 3 [(gogoproto.nullable)=false, (gogoproto.jsontag)="tags,omitempty"];
 }
@@ -225,8 +225,7 @@ message BlockGossip {
 }
 
 message LastCommitInfo {
-  int32 commit_round = 1;
-  repeated SigningValidator validators = 2 [(gogoproto.nullable)=false];
+  repeated VoteInfo commit_votes = 1 [(gogoproto.nullable)=false];
 }
 
 //----------------------------------------
@@ -272,14 +271,20 @@ message PartSetHeader {
 // Validator
 message Validator {
   bytes address = 1;
-  PubKey pub_key = 2 [(gogoproto.nullable)=false];
   int64 power = 3;
 }
 
-// Validator with an extra bool
-message SigningValidator {
+// ValidatorUpdate
+message ValidatorUpdate {
+  PubKey pub_key = 1 [(gogoproto.nullable)=false];
+  int64 power = 2;
+}
+
+// VoteInfo
+message VoteInfo {
   Validator validator = 1 [(gogoproto.nullable)=false];
   bool signed_last_block = 2;
+  int64 commit_round = 3;
 }
 
 message PubKey {
diff --git a/abci/types/typespb_test.go b/abci/types/typespb_test.go
index cdff9c728..de094ed48 100644
--- a/abci/types/typespb_test.go
+++ b/abci/types/typespb_test.go
@@ -42,7 +42,8 @@ It has these top-level messages:
 	BlockID
 	PartSetHeader
 	Validator
-	SigningValidator
+	ValidatorUpdate
+	VoteInfo
 	PubKey
 	Evidence
 */
@@ -1970,15 +1971,15 @@ func TestValidatorMarshalTo(t *testing.T) {
 	}
 }
 
-func TestSigningValidatorProto(t *testing.T) {
+func TestValidatorUpdateProto(t *testing.T) {
 	seed := time.Now().UnixNano()
 	popr := rand.New(rand.NewSource(seed))
-	p := NewPopulatedSigningValidator(popr, false)
+	p := NewPopulatedValidatorUpdate(popr, false)
 	dAtA, err := proto.Marshal(p)
 	if err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
 	}
-	msg := &SigningValidator{}
+	msg := &ValidatorUpdate{}
 	if err := proto.Unmarshal(dAtA, msg); err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
 	}
@@ -2001,10 +2002,10 @@ func TestSigningValidatorProto(t *testing.T) {
 	}
 }
 
-func TestSigningValidatorMarshalTo(t *testing.T) {
+func TestValidatorUpdateMarshalTo(t *testing.T) {
 	seed := time.Now().UnixNano()
 	popr := rand.New(rand.NewSource(seed))
-	p := NewPopulatedSigningValidator(popr, false)
+	p := NewPopulatedValidatorUpdate(popr, false)
 	size := p.Size()
 	dAtA := make([]byte, size)
 	for i := range dAtA {
@@ -2014,7 +2015,63 @@ func TestSigningValidatorMarshalTo(t *testing.T) {
 	if err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
 	}
-	msg := &SigningValidator{}
+	msg := &ValidatorUpdate{}
+	if err := proto.Unmarshal(dAtA, msg); err != nil {
+		t.Fatalf("seed = %d, err = %v", seed, err)
+	}
+	for i := range dAtA {
+		dAtA[i] = byte(popr.Intn(256))
+	}
+	if !p.Equal(msg) {
+		t.Fatalf("seed = %d, %#v !Proto %#v", seed, msg, p)
+	}
+}
+
+func TestVoteInfoProto(t *testing.T) {
+	seed := time.Now().UnixNano()
+	popr := rand.New(rand.NewSource(seed))
+	p := NewPopulatedVoteInfo(popr, false)
+	dAtA, err := proto.Marshal(p)
+	if err != nil {
+		t.Fatalf("seed = %d, err = %v", seed, err)
+	}
+	msg := &VoteInfo{}
+	if err := proto.Unmarshal(dAtA, msg); err != nil {
+		t.Fatalf("seed = %d, err = %v", seed, err)
+	}
+	littlefuzz := make([]byte, len(dAtA))
+	copy(littlefuzz, dAtA)
+	for i := range dAtA {
+		dAtA[i] = byte(popr.Intn(256))
+	}
+	if !p.Equal(msg) {
+		t.Fatalf("seed = %d, %#v !Proto %#v", seed, msg, p)
+	}
+	if len(littlefuzz) > 0 {
+		fuzzamount := 100
+		for i := 0; i < fuzzamount; i++ {
+			littlefuzz[popr.Intn(len(littlefuzz))] = byte(popr.Intn(256))
+			littlefuzz = append(littlefuzz, byte(popr.Intn(256)))
+		}
+		// shouldn't panic
+		_ = proto.Unmarshal(littlefuzz, msg)
+	}
+}
+
+func TestVoteInfoMarshalTo(t *testing.T) {
+	seed := time.Now().UnixNano()
+	popr := rand.New(rand.NewSource(seed))
+	p := NewPopulatedVoteInfo(popr, false)
+	size := p.Size()
+	dAtA := make([]byte, size)
+	for i := range dAtA {
+		dAtA[i] = byte(popr.Intn(256))
+	}
+	_, err := p.MarshalTo(dAtA)
+	if err != nil {
+		t.Fatalf("seed = %d, err = %v", seed, err)
+	}
+	msg := &VoteInfo{}
 	if err := proto.Unmarshal(dAtA, msg); err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
 	}
@@ -2750,16 +2807,34 @@ func TestValidatorJSON(t *testing.T) {
 		t.Fatalf("seed = %d, %#v !Json Equal %#v", seed, msg, p)
 	}
 }
-func TestSigningValidatorJSON(t *testing.T) {
+func TestValidatorUpdateJSON(t *testing.T) {
 	seed := time.Now().UnixNano()
 	popr := rand.New(rand.NewSource(seed))
-	p := NewPopulatedSigningValidator(popr, true)
+	p := NewPopulatedValidatorUpdate(popr, true)
 	marshaler := jsonpb.Marshaler{}
 	jsondata, err := marshaler.MarshalToString(p)
 	if err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
 	}
-	msg := &SigningValidator{}
+	msg := &ValidatorUpdate{}
+	err = jsonpb.UnmarshalString(jsondata, msg)
+	if err != nil {
+		t.Fatalf("seed = %d, err = %v", seed, err)
+	}
+	if !p.Equal(msg) {
+		t.Fatalf("seed = %d, %#v !Json Equal %#v", seed, msg, p)
+	}
+}
+func TestVoteInfoJSON(t *testing.T) {
+	seed := time.Now().UnixNano()
+	popr := rand.New(rand.NewSource(seed))
+	p := NewPopulatedVoteInfo(popr, true)
+	marshaler := jsonpb.Marshaler{}
+	jsondata, err := marshaler.MarshalToString(p)
+	if err != nil {
+		t.Fatalf("seed = %d, err = %v", seed, err)
+	}
+	msg := &VoteInfo{}
 	err = jsonpb.UnmarshalString(jsondata, msg)
 	if err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
@@ -3756,12 +3831,12 @@ func TestValidatorProtoCompactText(t *testing.T) {
 	}
 }
 
-func TestSigningValidatorProtoText(t *testing.T) {
+func TestValidatorUpdateProtoText(t *testing.T) {
 	seed := time.Now().UnixNano()
 	popr := rand.New(rand.NewSource(seed))
-	p := NewPopulatedSigningValidator(popr, true)
+	p := NewPopulatedValidatorUpdate(popr, true)
 	dAtA := proto.MarshalTextString(p)
-	msg := &SigningValidator{}
+	msg := &ValidatorUpdate{}
 	if err := proto.UnmarshalText(dAtA, msg); err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
 	}
@@ -3770,12 +3845,40 @@ func TestSigningValidatorProtoText(t *testing.T) {
 	}
 }
 
-func TestSigningValidatorProtoCompactText(t *testing.T) {
+func TestValidatorUpdateProtoCompactText(t *testing.T) {
 	seed := time.Now().UnixNano()
 	popr := rand.New(rand.NewSource(seed))
-	p := NewPopulatedSigningValidator(popr, true)
+	p := NewPopulatedValidatorUpdate(popr, true)
 	dAtA := proto.CompactTextString(p)
-	msg := &SigningValidator{}
+	msg := &ValidatorUpdate{}
+	if err := proto.UnmarshalText(dAtA, msg); err != nil {
+		t.Fatalf("seed = %d, err = %v", seed, err)
+	}
+	if !p.Equal(msg) {
+		t.Fatalf("seed = %d, %#v !Proto %#v", seed, msg, p)
+	}
+}
+
+func TestVoteInfoProtoText(t *testing.T) {
+	seed := time.Now().UnixNano()
+	popr := rand.New(rand.NewSource(seed))
+	p := NewPopulatedVoteInfo(popr, true)
+	dAtA := proto.MarshalTextString(p)
+	msg := &VoteInfo{}
+	if err := proto.UnmarshalText(dAtA, msg); err != nil {
+		t.Fatalf("seed = %d, err = %v", seed, err)
+	}
+	if !p.Equal(msg) {
+		t.Fatalf("seed = %d, %#v !Proto %#v", seed, msg, p)
+	}
+}
+
+func TestVoteInfoProtoCompactText(t *testing.T) {
+	seed := time.Now().UnixNano()
+	popr := rand.New(rand.NewSource(seed))
+	p := NewPopulatedVoteInfo(popr, true)
+	dAtA := proto.CompactTextString(p)
+	msg := &VoteInfo{}
 	if err := proto.UnmarshalText(dAtA, msg); err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
 	}
@@ -4588,10 +4691,32 @@ func TestValidatorSize(t *testing.T) {
 	}
 }
 
-func TestSigningValidatorSize(t *testing.T) {
+func TestValidatorUpdateSize(t *testing.T) {
+	seed := time.Now().UnixNano()
+	popr := rand.New(rand.NewSource(seed))
+	p := NewPopulatedValidatorUpdate(popr, true)
+	size2 := proto.Size(p)
+	dAtA, err := proto.Marshal(p)
+	if err != nil {
+		t.Fatalf("seed = %d, err = %v", seed, err)
+	}
+	size := p.Size()
+	if len(dAtA) != size {
+		t.Errorf("seed = %d, size %v != marshalled size %v", seed, size, len(dAtA))
+	}
+	if size2 != size {
+		t.Errorf("seed = %d, size %v != before marshal proto.Size %v", seed, size, size2)
+	}
+	size3 := proto.Size(p)
+	if size3 != size {
+		t.Errorf("seed = %d, size %v != after marshal proto.Size %v", seed, size, size3)
+	}
+}
+
+func TestVoteInfoSize(t *testing.T) {
 	seed := time.Now().UnixNano()
 	popr := rand.New(rand.NewSource(seed))
-	p := NewPopulatedSigningValidator(popr, true)
+	p := NewPopulatedVoteInfo(popr, true)
 	size2 := proto.Size(p)
 	dAtA, err := proto.Marshal(p)
 	if err != nil {
diff --git a/abci/types/util.go b/abci/types/util.go
index 458024c58..3cde88232 100644
--- a/abci/types/util.go
+++ b/abci/types/util.go
@@ -2,58 +2,33 @@ package types
 
 import (
 	"bytes"
-	"encoding/json"
 	"sort"
-
-	cmn "github.com/tendermint/tendermint/libs/common"
 )
 
 //------------------------------------------------------------------------------
 
-// Validators is a list of validators that implements the Sort interface
-type Validators []Validator
+// ValidatorUpdates is a list of validators that implements the Sort interface
+type ValidatorUpdates []ValidatorUpdate
 
-var _ sort.Interface = (Validators)(nil)
+var _ sort.Interface = (ValidatorUpdates)(nil)
 
-// All these methods for Validators:
+// All these methods for ValidatorUpdates:
 //    Len, Less and Swap
-// are for Validators to implement sort.Interface
+// are for ValidatorUpdates to implement sort.Interface
 // which will be used by the sort package.
 // See Issue https://github.com/tendermint/abci/issues/212
 
-func (v Validators) Len() int {
+func (v ValidatorUpdates) Len() int {
 	return len(v)
 }
 
 // XXX: doesn't distinguish same validator with different power
-func (v Validators) Less(i, j int) bool {
+func (v ValidatorUpdates) Less(i, j int) bool {
 	return bytes.Compare(v[i].PubKey.Data, v[j].PubKey.Data) <= 0
 }
 
-func (v Validators) Swap(i, j int) {
+func (v ValidatorUpdates) Swap(i, j int) {
 	v1 := v[i]
 	v[i] = v[j]
 	v[j] = v1
 }
-
-func ValidatorsString(vs Validators) string {
-	s := make([]validatorPretty, len(vs))
-	for i, v := range vs {
-		s[i] = validatorPretty{
-			Address: v.Address,
-			PubKey:  v.PubKey.Data,
-			Power:   v.Power,
-		}
-	}
-	b, err := json.Marshal(s)
-	if err != nil {
-		panic(err.Error())
-	}
-	return string(b)
-}
-
-type validatorPretty struct {
-	Address cmn.HexBytes `json:"address"`
-	PubKey  []byte       `json:"pub_key"`
-	Power   int64        `json:"power"`
-}
diff --git a/consensus/common_test.go b/consensus/common_test.go
index 818946184..dc055959b 100644
--- a/consensus/common_test.go
+++ b/consensus/common_test.go
@@ -354,7 +354,7 @@ func randConsensusNet(nValidators int, testName string, tickerFunc func() Timeou
 		}
 		ensureDir(path.Dir(thisConfig.Consensus.WalFile()), 0700) // dir for wal
 		app := appFunc()
-		vals := types.TM2PB.Validators(state.Validators)
+		vals := types.TM2PB.ValidatorUpdates(state.Validators)
 		app.InitChain(abci.RequestInitChain{Validators: vals})
 
 		css[i] = newConsensusStateWithConfig(thisConfig, state, privVals[i], app)
@@ -386,7 +386,7 @@ func randConsensusNetWithPeers(nValidators, nPeers int, testName string, tickerF
 		}
 
 		app := appFunc()
-		vals := types.TM2PB.Validators(state.Validators)
+		vals := types.TM2PB.ValidatorUpdates(state.Validators)
 		app.InitChain(abci.RequestInitChain{Validators: vals})
 
 		css[i] = newConsensusStateWithConfig(thisConfig, state, privVal, app)
diff --git a/consensus/reactor_test.go b/consensus/reactor_test.go
index 35502fb1c..4a6d4b9dc 100644
--- a/consensus/reactor_test.go
+++ b/consensus/reactor_test.go
@@ -118,7 +118,7 @@ func TestReactorWithEvidence(t *testing.T) {
 		thisConfig := ResetConfig(fmt.Sprintf("%s_%d", testName, i))
 		ensureDir(path.Dir(thisConfig.Consensus.WalFile()), 0700) // dir for wal
 		app := appFunc()
-		vals := types.TM2PB.Validators(state.Validators)
+		vals := types.TM2PB.ValidatorUpdates(state.Validators)
 		app.InitChain(abci.RequestInitChain{Validators: vals})
 
 		pv := privVals[i]
diff --git a/consensus/replay.go b/consensus/replay.go
index cff8344be..c92654f2c 100644
--- a/consensus/replay.go
+++ b/consensus/replay.go
@@ -266,7 +266,7 @@ func (h *Handshaker) ReplayBlocks(state sm.State, appHash []byte, appBlockHeight
 
 	// If appBlockHeight == 0 it means that we are at genesis and hence should send InitChain.
 	if appBlockHeight == 0 {
-		nextVals := types.TM2PB.Validators(state.NextValidators) // state.Validators would work too.
+		nextVals := types.TM2PB.ValidatorUpdates(state.NextValidators) // state.Validators would work too.
 		csParams := types.TM2PB.ConsensusParams(h.genDoc.ConsensusParams)
 		req := abci.RequestInitChain{
 			Time:            h.genDoc.GenesisTime,
@@ -282,7 +282,7 @@ func (h *Handshaker) ReplayBlocks(state sm.State, appHash []byte, appBlockHeight
 
 		// If the app returned validators or consensus params, update the state.
 		if len(res.Validators) > 0 {
-			vals, err := types.PB2TM.Validators(res.Validators)
+			vals, err := types.PB2TM.ValidatorUpdates(res.Validators)
 			if err != nil {
 				return nil, err
 			}
diff --git a/consensus/replay_test.go b/consensus/replay_test.go
index c74a1ae9d..8ea71d353 100644
--- a/consensus/replay_test.go
+++ b/consensus/replay_test.go
@@ -416,7 +416,7 @@ func buildAppStateFromChain(proxyApp proxy.AppConns, stateDB dbm.DB,
 	}
 	defer proxyApp.Stop()
 
-	validators := types.TM2PB.Validators(state.Validators)
+	validators := types.TM2PB.ValidatorUpdates(state.Validators)
 	if _, err := proxyApp.Consensus().InitChainSync(abci.RequestInitChain{
 		Validators: validators,
 	}); err != nil {
@@ -453,7 +453,7 @@ func buildTMStateFromChain(config *cfg.Config, stateDB dbm.DB, state sm.State, c
 	}
 	defer proxyApp.Stop()
 
-	validators := types.TM2PB.Validators(state.Validators)
+	validators := types.TM2PB.ValidatorUpdates(state.Validators)
 	if _, err := proxyApp.Consensus().InitChainSync(abci.RequestInitChain{
 		Validators: validators,
 	}); err != nil {
@@ -639,7 +639,7 @@ func (bs *mockBlockStore) LoadSeenCommit(height int64) *types.Commit {
 func TestInitChainUpdateValidators(t *testing.T) {
 	val, _ := types.RandValidator(true, 10)
 	vals := types.NewValidatorSet([]*types.Validator{val})
-	app := &initChainApp{vals: types.TM2PB.Validators(vals)}
+	app := &initChainApp{vals: types.TM2PB.ValidatorUpdates(vals)}
 	clientCreator := proxy.NewLocalClientCreator(app)
 
 	config := ResetConfig("proxy_test_")
@@ -666,7 +666,7 @@ func TestInitChainUpdateValidators(t *testing.T) {
 	assert.Equal(t, newValAddr, expectValAddr)
 }
 
-func newInitChainApp(vals []abci.Validator) *initChainApp {
+func newInitChainApp(vals []abci.ValidatorUpdate) *initChainApp {
 	return &initChainApp{
 		vals: vals,
 	}
@@ -675,7 +675,7 @@ func newInitChainApp(vals []abci.Validator) *initChainApp {
 // returns the vals on InitChain
 type initChainApp struct {
 	abci.BaseApplication
-	vals []abci.Validator
+	vals []abci.ValidatorUpdate
 }
 
 func (ica *initChainApp) InitChain(req abci.RequestInitChain) abci.ResponseInitChain {
diff --git a/state/execution.go b/state/execution.go
index 7e7bc37a7..71b3ec1c1 100644
--- a/state/execution.go
+++ b/state/execution.go
@@ -184,15 +184,14 @@ func execBlockOnProxyApp(logger log.Logger, proxyAppConn proxy.AppConnConsensus,
 	}
 	proxyAppConn.SetResponseCallback(proxyCb)
 
-	signVals, byzVals := getBeginBlockValidatorInfo(block, lastValSet, stateDB)
+	voteInfos, byzVals := getBeginBlockValidatorInfo(block, lastValSet, stateDB)
 
 	// Begin block.
 	_, err := proxyAppConn.BeginBlockSync(abci.RequestBeginBlock{
 		Hash:   block.Hash(),
 		Header: types.TM2PB.Header(&block.Header),
 		LastCommitInfo: abci.LastCommitInfo{
-			CommitRound: int32(block.LastCommit.Round()),
-			Validators:  signVals,
+			CommitVotes: voteInfos,
 		},
 		ByzantineValidators: byzVals,
 	})
@@ -218,15 +217,15 @@ func execBlockOnProxyApp(logger log.Logger, proxyAppConn proxy.AppConnConsensus,
 
 	logger.Info("Executed block", "height", block.Height, "validTxs", validTxs, "invalidTxs", invalidTxs)
 
-	valUpdates := abciResponses.EndBlock.ValidatorUpdates
-	if len(valUpdates) > 0 {
-		logger.Info("Updates to validators", "updates", abci.ValidatorsString(valUpdates))
+	if len(abciResponses.EndBlock.ValidatorUpdates) > 0 {
+		// TODO: cleanup the formatting
+		logger.Info("Updates to validators", "updates", abciResponses.EndBlock.ValidatorUpdates)
 	}
 
 	return abciResponses, nil
 }
 
-func getBeginBlockValidatorInfo(block *types.Block, lastValSet *types.ValidatorSet, stateDB dbm.DB) ([]abci.SigningValidator, []abci.Evidence) {
+func getBeginBlockValidatorInfo(block *types.Block, lastValSet *types.ValidatorSet, stateDB dbm.DB) ([]abci.VoteInfo, []abci.Evidence) {
 
 	// Sanity check that commit length matches validator set size -
 	// only applies after first block
@@ -241,17 +240,22 @@ func getBeginBlockValidatorInfo(block *types.Block, lastValSet *types.ValidatorS
 	}
 
 	// determine which validators did not sign last block.
-	signVals := make([]abci.SigningValidator, len(lastValSet.Validators))
+	voteInfos := make([]abci.VoteInfo, len(lastValSet.Validators))
 	for i, val := range lastValSet.Validators {
 		var vote *types.Vote
+		var commitRound = -1
 		if i < len(block.LastCommit.Precommits) {
 			vote = block.LastCommit.Precommits[i]
+			if vote != nil {
+				commitRound = vote.Round
+			}
 		}
-		val := abci.SigningValidator{
-			Validator:       types.TM2PB.ValidatorWithoutPubKey(val),
-			SignedLastBlock: vote != nil,
+		voteInfo := abci.VoteInfo{
+			Validator:       types.TM2PB.Validator(val),
+			SignedLastBlock: vote != nil,        // XXX: should we replace with commitRound == -1 ?
+			CommitRound:     int64(commitRound), //XXX: why is round an int?
 		}
-		signVals[i] = val
+		voteInfos[i] = voteInfo
 	}
 
 	byzVals := make([]abci.Evidence, len(block.Evidence.Evidence))
@@ -266,15 +270,15 @@ func getBeginBlockValidatorInfo(block *types.Block, lastValSet *types.ValidatorS
 		byzVals[i] = types.TM2PB.Evidence(ev, valset, block.Time)
 	}
 
-	return signVals, byzVals
+	return voteInfos, byzVals
 
 }
 
 // If more or equal than 1/3 of total voting power changed in one block, then
 // a light client could never prove the transition externally. See
 // ./lite/doc.go for details on how a light client tracks validators.
-func updateValidators(currentSet *types.ValidatorSet, abciUpdates []abci.Validator) error {
-	updates, err := types.PB2TM.Validators(abciUpdates)
+func updateValidators(currentSet *types.ValidatorSet, abciUpdates []abci.ValidatorUpdate) error {
+	updates, err := types.PB2TM.ValidatorUpdates(abciUpdates)
 	if err != nil {
 		return err
 	}
diff --git a/state/execution_test.go b/state/execution_test.go
index 161b96f23..52baadf3f 100644
--- a/state/execution_test.go
+++ b/state/execution_test.go
@@ -86,7 +86,7 @@ func TestBeginBlockValidators(t *testing.T) {
 
 		// -> app receives a list of validators with a bool indicating if they signed
 		ctr := 0
-		for i, v := range app.Validators {
+		for i, v := range app.CommitVotes {
 			if ctr < len(tc.expectedAbsentValidators) &&
 				tc.expectedAbsentValidators[ctr] == i {
 
@@ -160,7 +160,7 @@ func TestUpdateValidators(t *testing.T) {
 		name string
 
 		currentSet  *types.ValidatorSet
-		abciUpdates []abci.Validator
+		abciUpdates []abci.ValidatorUpdate
 
 		resultingSet *types.ValidatorSet
 		shouldErr    bool
@@ -169,7 +169,7 @@ func TestUpdateValidators(t *testing.T) {
 			"adding a validator is OK",
 
 			types.NewValidatorSet([]*types.Validator{val1}),
-			[]abci.Validator{{Address: []byte{}, PubKey: types.TM2PB.PubKey(pubkey2), Power: 20}},
+			[]abci.ValidatorUpdate{{PubKey: types.TM2PB.PubKey(pubkey2), Power: 20}},
 
 			types.NewValidatorSet([]*types.Validator{val1, val2}),
 			false,
@@ -178,7 +178,7 @@ func TestUpdateValidators(t *testing.T) {
 			"updating a validator is OK",
 
 			types.NewValidatorSet([]*types.Validator{val1}),
-			[]abci.Validator{{Address: []byte{}, PubKey: types.TM2PB.PubKey(pubkey1), Power: 20}},
+			[]abci.ValidatorUpdate{{PubKey: types.TM2PB.PubKey(pubkey1), Power: 20}},
 
 			types.NewValidatorSet([]*types.Validator{types.NewValidator(pubkey1, 20)}),
 			false,
@@ -187,7 +187,7 @@ func TestUpdateValidators(t *testing.T) {
 			"removing a validator is OK",
 
 			types.NewValidatorSet([]*types.Validator{val1, val2}),
-			[]abci.Validator{{Address: []byte{}, PubKey: types.TM2PB.PubKey(pubkey2), Power: 0}},
+			[]abci.ValidatorUpdate{{PubKey: types.TM2PB.PubKey(pubkey2), Power: 0}},
 
 			types.NewValidatorSet([]*types.Validator{val1}),
 			false,
@@ -197,7 +197,7 @@ func TestUpdateValidators(t *testing.T) {
 			"removing a non-existing validator results in error",
 
 			types.NewValidatorSet([]*types.Validator{val1}),
-			[]abci.Validator{{Address: []byte{}, PubKey: types.TM2PB.PubKey(pubkey2), Power: 0}},
+			[]abci.ValidatorUpdate{{PubKey: types.TM2PB.PubKey(pubkey2), Power: 0}},
 
 			types.NewValidatorSet([]*types.Validator{val1}),
 			true,
@@ -207,7 +207,7 @@ func TestUpdateValidators(t *testing.T) {
 			"adding a validator with negative power results in error",
 
 			types.NewValidatorSet([]*types.Validator{val1}),
-			[]abci.Validator{{Address: []byte{}, PubKey: types.TM2PB.PubKey(pubkey2), Power: -100}},
+			[]abci.ValidatorUpdate{{PubKey: types.TM2PB.PubKey(pubkey2), Power: -100}},
 
 			types.NewValidatorSet([]*types.Validator{val1}),
 			true,
@@ -335,7 +335,7 @@ func makeBlock(state State, height int64) *types.Block {
 type testApp struct {
 	abci.BaseApplication
 
-	Validators          []abci.SigningValidator
+	CommitVotes         []abci.VoteInfo
 	ByzantineValidators []abci.Evidence
 	ValidatorUpdates    []abci.Validator
 }
@@ -347,7 +347,7 @@ func (app *testApp) Info(req abci.RequestInfo) (resInfo abci.ResponseInfo) {
 }
 
 func (app *testApp) BeginBlock(req abci.RequestBeginBlock) abci.ResponseBeginBlock {
-	app.Validators = req.LastCommitInfo.Validators
+	app.CommitVotes = req.LastCommitInfo.CommitVotes
 	app.ByzantineValidators = req.ByzantineValidators
 	return abci.ResponseBeginBlock{}
 }
diff --git a/state/state_test.go b/state/state_test.go
index 211d5fdc9..d8a8c0b82 100644
--- a/state/state_test.go
+++ b/state/state_test.go
@@ -78,8 +78,8 @@ func TestABCIResponsesSaveLoad1(t *testing.T) {
 	abciResponses := NewABCIResponses(block)
 	abciResponses.DeliverTx[0] = &abci.ResponseDeliverTx{Data: []byte("foo"), Tags: nil}
 	abciResponses.DeliverTx[1] = &abci.ResponseDeliverTx{Data: []byte("bar"), Log: "ok", Tags: nil}
-	abciResponses.EndBlock = &abci.ResponseEndBlock{ValidatorUpdates: []abci.Validator{
-		types.TM2PB.ValidatorFromPubKeyAndPower(ed25519.GenPrivKey().PubKey(), 10),
+	abciResponses.EndBlock = &abci.ResponseEndBlock{ValidatorUpdates: []abci.ValidatorUpdate{
+		types.TM2PB.NewValidatorUpdate(ed25519.GenPrivKey().PubKey(), 10),
 	}}
 
 	saveABCIResponses(stateDB, block.Height, abciResponses)
@@ -454,9 +454,9 @@ func makeHeaderPartsResponsesValPubKeyChange(state State, height int64,
 	_, val := state.NextValidators.GetByIndex(0)
 	if !bytes.Equal(pubkey.Bytes(), val.PubKey.Bytes()) {
 		abciResponses.EndBlock = &abci.ResponseEndBlock{
-			ValidatorUpdates: []abci.Validator{
-				types.TM2PB.ValidatorFromPubKeyAndPower(val.PubKey, 0),
-				types.TM2PB.ValidatorFromPubKeyAndPower(pubkey, 10),
+			ValidatorUpdates: []abci.ValidatorUpdate{
+				types.TM2PB.NewValidatorUpdate(val.PubKey, 0),
+				types.TM2PB.NewValidatorUpdate(pubkey, 10),
 			},
 		}
 	}
@@ -476,8 +476,8 @@ func makeHeaderPartsResponsesValPowerChange(state State, height int64,
 	_, val := state.NextValidators.GetByIndex(0)
 	if val.VotingPower != power {
 		abciResponses.EndBlock = &abci.ResponseEndBlock{
-			ValidatorUpdates: []abci.Validator{
-				types.TM2PB.ValidatorFromPubKeyAndPower(val.PubKey, power),
+			ValidatorUpdates: []abci.ValidatorUpdate{
+				types.TM2PB.NewValidatorUpdate(val.PubKey, power),
 			},
 		}
 	}
diff --git a/types/protobuf.go b/types/protobuf.go
index 1681dd376..1363430b0 100644
--- a/types/protobuf.go
+++ b/types/protobuf.go
@@ -1,7 +1,6 @@
 package types
 
 import (
-	"bytes"
 	"fmt"
 	"reflect"
 	"time"
@@ -56,7 +55,7 @@ func (tm2pb) Header(header *Header) abci.Header {
 	}
 }
 
-func (tm2pb) ValidatorWithoutPubKey(val *Validator) abci.Validator {
+func (tm2pb) Validator(val *Validator) abci.Validator {
 	return abci.Validator{
 		Address: val.PubKey.Address(),
 		Power:   val.VotingPower,
@@ -78,11 +77,10 @@ func (tm2pb) PartSetHeader(header PartSetHeader) abci.PartSetHeader {
 }
 
 // XXX: panics on unknown pubkey type
-func (tm2pb) Validator(val *Validator) abci.Validator {
-	return abci.Validator{
-		Address: val.PubKey.Address(),
-		PubKey:  TM2PB.PubKey(val.PubKey),
-		Power:   val.VotingPower,
+func (tm2pb) ValidatorUpdate(val *Validator) abci.ValidatorUpdate {
+	return abci.ValidatorUpdate{
+		PubKey: TM2PB.PubKey(val.PubKey),
+		Power:  val.VotingPower,
 	}
 }
 
@@ -106,10 +104,10 @@ func (tm2pb) PubKey(pubKey crypto.PubKey) abci.PubKey {
 }
 
 // XXX: panics on nil or unknown pubkey type
-func (tm2pb) Validators(vals *ValidatorSet) []abci.Validator {
-	validators := make([]abci.Validator, vals.Size())
+func (tm2pb) ValidatorUpdates(vals *ValidatorSet) []abci.ValidatorUpdate {
+	validators := make([]abci.ValidatorUpdate, vals.Size())
 	for i, val := range vals.Validators {
-		validators[i] = TM2PB.Validator(val)
+		validators[i] = TM2PB.ValidatorUpdate(val)
 	}
 	return validators
 }
@@ -156,7 +154,7 @@ func (tm2pb) Evidence(ev Evidence, valSet *ValidatorSet, evTime time.Time) abci.
 
 	return abci.Evidence{
 		Type:             evType,
-		Validator:        TM2PB.ValidatorWithoutPubKey(val),
+		Validator:        TM2PB.Validator(val),
 		Height:           ev.Height(),
 		Time:             evTime,
 		TotalVotingPower: valSet.TotalVotingPower(),
@@ -164,12 +162,11 @@ func (tm2pb) Evidence(ev Evidence, valSet *ValidatorSet, evTime time.Time) abci.
 }
 
 // XXX: panics on nil or unknown pubkey type
-func (tm2pb) ValidatorFromPubKeyAndPower(pubkey crypto.PubKey, power int64) abci.Validator {
+func (tm2pb) NewValidatorUpdate(pubkey crypto.PubKey, power int64) abci.ValidatorUpdate {
 	pubkeyABCI := TM2PB.PubKey(pubkey)
-	return abci.Validator{
-		Address: pubkey.Address(),
-		PubKey:  pubkeyABCI,
-		Power:   power,
+	return abci.ValidatorUpdate{
+		PubKey: pubkeyABCI,
+		Power:  power,
 	}
 }
 
@@ -205,7 +202,7 @@ func (pb2tm) PubKey(pubKey abci.PubKey) (crypto.PubKey, error) {
 	}
 }
 
-func (pb2tm) Validators(vals []abci.Validator) ([]*Validator, error) {
+func (pb2tm) ValidatorUpdates(vals []abci.ValidatorUpdate) ([]*Validator, error) {
 	tmVals := make([]*Validator, len(vals))
 	for i, v := range vals {
 		pub, err := PB2TM.PubKey(v.PubKey)
@@ -214,17 +211,13 @@ func (pb2tm) Validators(vals []abci.Validator) ([]*Validator, error) {
 		}
 		// If the app provided an address too, it must match.
 		// This is just a sanity check.
-		if len(v.Address) > 0 {
+		/*if len(v.Address) > 0 {
 			if !bytes.Equal(pub.Address(), v.Address) {
 				return nil, fmt.Errorf("Validator.Address (%X) does not match PubKey.Address (%X)",
 					v.Address, pub.Address())
 			}
-		}
-		tmVals[i] = &Validator{
-			Address:     pub.Address(),
-			PubKey:      pub,
-			VotingPower: v.Power,
-		}
+		}*/
+		tmVals[i] = NewValidator(pub, v.Power)
 	}
 	return tmVals, nil
 }
diff --git a/types/protobuf_test.go b/types/protobuf_test.go
index caad5c8f9..22bed60fa 100644
--- a/types/protobuf_test.go
+++ b/types/protobuf_test.go
@@ -41,26 +41,26 @@ func TestABCIValidators(t *testing.T) {
 		VotingPower: 10,
 	}
 
-	abciVal := TM2PB.Validator(tmVal)
-	tmVals, err := PB2TM.Validators([]abci.Validator{abciVal})
+	abciVal := TM2PB.ValidatorUpdate(tmVal)
+	tmVals, err := PB2TM.ValidatorUpdates([]abci.ValidatorUpdate{abciVal})
 	assert.Nil(t, err)
 	assert.Equal(t, tmValExpected, tmVals[0])
 
-	abciVals := TM2PB.Validators(NewValidatorSet(tmVals))
-	assert.Equal(t, []abci.Validator{abciVal}, abciVals)
+	abciVals := TM2PB.ValidatorUpdates(NewValidatorSet(tmVals))
+	assert.Equal(t, []abci.ValidatorUpdate{abciVal}, abciVals)
 
 	// val with address
 	tmVal.Address = pkEd.Address()
 
-	abciVal = TM2PB.Validator(tmVal)
-	tmVals, err = PB2TM.Validators([]abci.Validator{abciVal})
+	abciVal = TM2PB.ValidatorUpdate(tmVal)
+	tmVals, err = PB2TM.ValidatorUpdates([]abci.ValidatorUpdate{abciVal})
 	assert.Nil(t, err)
 	assert.Equal(t, tmValExpected, tmVals[0])
 
-	// val with incorrect address
-	abciVal = TM2PB.Validator(tmVal)
-	abciVal.Address = []byte("incorrect!")
-	tmVals, err = PB2TM.Validators([]abci.Validator{abciVal})
+	// val with incorrect pubkey daya
+	abciVal = TM2PB.ValidatorUpdate(tmVal)
+	abciVal.PubKey.Data = []byte("incorrect!")
+	tmVals, err = PB2TM.ValidatorUpdates([]abci.ValidatorUpdate{abciVal})
 	assert.NotNil(t, err)
 	assert.Nil(t, tmVals)
 }
@@ -104,9 +104,6 @@ func TestABCIEvidence(t *testing.T) {
 	)
 
 	assert.Equal(t, "duplicate/vote", abciEv.Type)
-
-	// test we do not send pubkeys
-	assert.Empty(t, abciEv.Validator.PubKey)
 }
 
 type pubKeyEddie struct{}
@@ -119,17 +116,17 @@ func (pubKeyEddie) Equals(crypto.PubKey) bool               { return false }
 func TestABCIValidatorFromPubKeyAndPower(t *testing.T) {
 	pubkey := ed25519.GenPrivKey().PubKey()
 
-	abciVal := TM2PB.ValidatorFromPubKeyAndPower(pubkey, 10)
+	abciVal := TM2PB.NewValidatorUpdate(pubkey, 10)
 	assert.Equal(t, int64(10), abciVal.Power)
 
-	assert.Panics(t, func() { TM2PB.ValidatorFromPubKeyAndPower(nil, 10) })
-	assert.Panics(t, func() { TM2PB.ValidatorFromPubKeyAndPower(pubKeyEddie{}, 10) })
+	assert.Panics(t, func() { TM2PB.NewValidatorUpdate(nil, 10) })
+	assert.Panics(t, func() { TM2PB.NewValidatorUpdate(pubKeyEddie{}, 10) })
 }
 
 func TestABCIValidatorWithoutPubKey(t *testing.T) {
 	pkEd := ed25519.GenPrivKey().PubKey()
 
-	abciVal := TM2PB.ValidatorWithoutPubKey(&Validator{
+	abciVal := TM2PB.Validator(&Validator{
 		Address:     pkEd.Address(),
 		PubKey:      pkEd,
 		VotingPower: 10,