diff --git a/CHANGELOG_PENDING.md b/CHANGELOG_PENDING.md
index be90fc199..daa4931c5 100644
--- a/CHANGELOG_PENDING.md
+++ b/CHANGELOG_PENDING.md
@@ -14,6 +14,7 @@ BREAKING CHANGES:
 - [p2p] Remove salsa and ripemd primitives, in favor of using chacha as a stream cipher, and hkdf
 - [abci] Changed time format from int64 to google.protobuf.Timestamp
 - [abci] Changed Validators to LastCommitInfo in RequestBeginBlock
+- [abci] Added address of the original proposer of the block to Header.
 
 FEATURES:
 - [tools] Added `make check_dep`
diff --git a/abci/types/types.pb.go b/abci/types/types.pb.go
index ac71d91c8..c74730757 100644
--- a/abci/types/types.pb.go
+++ b/abci/types/types.pb.go
@@ -59,7 +59,7 @@ func (m *Request) Reset()         { *m = Request{} }
 func (m *Request) String() string { return proto.CompactTextString(m) }
 func (*Request) ProtoMessage()    {}
 func (*Request) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{0}
+	return fileDescriptor_types_2abffab37bc29540, []int{0}
 }
 func (m *Request) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -481,7 +481,7 @@ func (m *RequestEcho) Reset()         { *m = RequestEcho{} }
 func (m *RequestEcho) String() string { return proto.CompactTextString(m) }
 func (*RequestEcho) ProtoMessage()    {}
 func (*RequestEcho) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{1}
+	return fileDescriptor_types_2abffab37bc29540, []int{1}
 }
 func (m *RequestEcho) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -527,7 +527,7 @@ func (m *RequestFlush) Reset()         { *m = RequestFlush{} }
 func (m *RequestFlush) String() string { return proto.CompactTextString(m) }
 func (*RequestFlush) ProtoMessage()    {}
 func (*RequestFlush) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{2}
+	return fileDescriptor_types_2abffab37bc29540, []int{2}
 }
 func (m *RequestFlush) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -567,7 +567,7 @@ func (m *RequestInfo) Reset()         { *m = RequestInfo{} }
 func (m *RequestInfo) String() string { return proto.CompactTextString(m) }
 func (*RequestInfo) ProtoMessage()    {}
 func (*RequestInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{3}
+	return fileDescriptor_types_2abffab37bc29540, []int{3}
 }
 func (m *RequestInfo) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -616,7 +616,7 @@ func (m *RequestSetOption) Reset()         { *m = RequestSetOption{} }
 func (m *RequestSetOption) String() string { return proto.CompactTextString(m) }
 func (*RequestSetOption) ProtoMessage()    {}
 func (*RequestSetOption) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{4}
+	return fileDescriptor_types_2abffab37bc29540, []int{4}
 }
 func (m *RequestSetOption) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -674,7 +674,7 @@ func (m *RequestInitChain) Reset()         { *m = RequestInitChain{} }
 func (m *RequestInitChain) String() string { return proto.CompactTextString(m) }
 func (*RequestInitChain) ProtoMessage()    {}
 func (*RequestInitChain) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{5}
+	return fileDescriptor_types_2abffab37bc29540, []int{5}
 }
 func (m *RequestInitChain) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -752,7 +752,7 @@ func (m *RequestQuery) Reset()         { *m = RequestQuery{} }
 func (m *RequestQuery) String() string { return proto.CompactTextString(m) }
 func (*RequestQuery) ProtoMessage()    {}
 func (*RequestQuery) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{6}
+	return fileDescriptor_types_2abffab37bc29540, []int{6}
 }
 func (m *RequestQuery) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -824,7 +824,7 @@ func (m *RequestBeginBlock) Reset()         { *m = RequestBeginBlock{} }
 func (m *RequestBeginBlock) String() string { return proto.CompactTextString(m) }
 func (*RequestBeginBlock) ProtoMessage()    {}
 func (*RequestBeginBlock) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{7}
+	return fileDescriptor_types_2abffab37bc29540, []int{7}
 }
 func (m *RequestBeginBlock) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -892,7 +892,7 @@ func (m *RequestCheckTx) Reset()         { *m = RequestCheckTx{} }
 func (m *RequestCheckTx) String() string { return proto.CompactTextString(m) }
 func (*RequestCheckTx) ProtoMessage()    {}
 func (*RequestCheckTx) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{8}
+	return fileDescriptor_types_2abffab37bc29540, []int{8}
 }
 func (m *RequestCheckTx) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -939,7 +939,7 @@ func (m *RequestDeliverTx) Reset()         { *m = RequestDeliverTx{} }
 func (m *RequestDeliverTx) String() string { return proto.CompactTextString(m) }
 func (*RequestDeliverTx) ProtoMessage()    {}
 func (*RequestDeliverTx) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{9}
+	return fileDescriptor_types_2abffab37bc29540, []int{9}
 }
 func (m *RequestDeliverTx) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -986,7 +986,7 @@ func (m *RequestEndBlock) Reset()         { *m = RequestEndBlock{} }
 func (m *RequestEndBlock) String() string { return proto.CompactTextString(m) }
 func (*RequestEndBlock) ProtoMessage()    {}
 func (*RequestEndBlock) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{10}
+	return fileDescriptor_types_2abffab37bc29540, []int{10}
 }
 func (m *RequestEndBlock) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1032,7 +1032,7 @@ func (m *RequestCommit) Reset()         { *m = RequestCommit{} }
 func (m *RequestCommit) String() string { return proto.CompactTextString(m) }
 func (*RequestCommit) ProtoMessage()    {}
 func (*RequestCommit) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{11}
+	return fileDescriptor_types_2abffab37bc29540, []int{11}
 }
 func (m *RequestCommit) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1085,7 +1085,7 @@ func (m *Response) Reset()         { *m = Response{} }
 func (m *Response) String() string { return proto.CompactTextString(m) }
 func (*Response) ProtoMessage()    {}
 func (*Response) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{12}
+	return fileDescriptor_types_2abffab37bc29540, []int{12}
 }
 func (m *Response) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1538,7 +1538,7 @@ func (m *ResponseException) Reset()         { *m = ResponseException{} }
 func (m *ResponseException) String() string { return proto.CompactTextString(m) }
 func (*ResponseException) ProtoMessage()    {}
 func (*ResponseException) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{13}
+	return fileDescriptor_types_2abffab37bc29540, []int{13}
 }
 func (m *ResponseException) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1585,7 +1585,7 @@ func (m *ResponseEcho) Reset()         { *m = ResponseEcho{} }
 func (m *ResponseEcho) String() string { return proto.CompactTextString(m) }
 func (*ResponseEcho) ProtoMessage()    {}
 func (*ResponseEcho) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{14}
+	return fileDescriptor_types_2abffab37bc29540, []int{14}
 }
 func (m *ResponseEcho) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1631,7 +1631,7 @@ func (m *ResponseFlush) Reset()         { *m = ResponseFlush{} }
 func (m *ResponseFlush) String() string { return proto.CompactTextString(m) }
 func (*ResponseFlush) ProtoMessage()    {}
 func (*ResponseFlush) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{15}
+	return fileDescriptor_types_2abffab37bc29540, []int{15}
 }
 func (m *ResponseFlush) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1674,7 +1674,7 @@ func (m *ResponseInfo) Reset()         { *m = ResponseInfo{} }
 func (m *ResponseInfo) String() string { return proto.CompactTextString(m) }
 func (*ResponseInfo) ProtoMessage()    {}
 func (*ResponseInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{16}
+	return fileDescriptor_types_2abffab37bc29540, []int{16}
 }
 func (m *ResponseInfo) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1746,7 +1746,7 @@ func (m *ResponseSetOption) Reset()         { *m = ResponseSetOption{} }
 func (m *ResponseSetOption) String() string { return proto.CompactTextString(m) }
 func (*ResponseSetOption) ProtoMessage()    {}
 func (*ResponseSetOption) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{17}
+	return fileDescriptor_types_2abffab37bc29540, []int{17}
 }
 func (m *ResponseSetOption) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1808,7 +1808,7 @@ func (m *ResponseInitChain) Reset()         { *m = ResponseInitChain{} }
 func (m *ResponseInitChain) String() string { return proto.CompactTextString(m) }
 func (*ResponseInitChain) ProtoMessage()    {}
 func (*ResponseInitChain) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{18}
+	return fileDescriptor_types_2abffab37bc29540, []int{18}
 }
 func (m *ResponseInitChain) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1870,7 +1870,7 @@ func (m *ResponseQuery) Reset()         { *m = ResponseQuery{} }
 func (m *ResponseQuery) String() string { return proto.CompactTextString(m) }
 func (*ResponseQuery) ProtoMessage()    {}
 func (*ResponseQuery) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{19}
+	return fileDescriptor_types_2abffab37bc29540, []int{19}
 }
 func (m *ResponseQuery) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1966,7 +1966,7 @@ func (m *ResponseBeginBlock) Reset()         { *m = ResponseBeginBlock{} }
 func (m *ResponseBeginBlock) String() string { return proto.CompactTextString(m) }
 func (*ResponseBeginBlock) ProtoMessage()    {}
 func (*ResponseBeginBlock) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{20}
+	return fileDescriptor_types_2abffab37bc29540, []int{20}
 }
 func (m *ResponseBeginBlock) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2019,7 +2019,7 @@ func (m *ResponseCheckTx) Reset()         { *m = ResponseCheckTx{} }
 func (m *ResponseCheckTx) String() string { return proto.CompactTextString(m) }
 func (*ResponseCheckTx) ProtoMessage()    {}
 func (*ResponseCheckTx) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{21}
+	return fileDescriptor_types_2abffab37bc29540, []int{21}
 }
 func (m *ResponseCheckTx) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2114,7 +2114,7 @@ func (m *ResponseDeliverTx) Reset()         { *m = ResponseDeliverTx{} }
 func (m *ResponseDeliverTx) String() string { return proto.CompactTextString(m) }
 func (*ResponseDeliverTx) ProtoMessage()    {}
 func (*ResponseDeliverTx) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{22}
+	return fileDescriptor_types_2abffab37bc29540, []int{22}
 }
 func (m *ResponseDeliverTx) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2205,7 +2205,7 @@ func (m *ResponseEndBlock) Reset()         { *m = ResponseEndBlock{} }
 func (m *ResponseEndBlock) String() string { return proto.CompactTextString(m) }
 func (*ResponseEndBlock) ProtoMessage()    {}
 func (*ResponseEndBlock) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{23}
+	return fileDescriptor_types_2abffab37bc29540, []int{23}
 }
 func (m *ResponseEndBlock) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2267,7 +2267,7 @@ func (m *ResponseCommit) Reset()         { *m = ResponseCommit{} }
 func (m *ResponseCommit) String() string { return proto.CompactTextString(m) }
 func (*ResponseCommit) ProtoMessage()    {}
 func (*ResponseCommit) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{24}
+	return fileDescriptor_types_2abffab37bc29540, []int{24}
 }
 func (m *ResponseCommit) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2318,7 +2318,7 @@ func (m *ConsensusParams) Reset()         { *m = ConsensusParams{} }
 func (m *ConsensusParams) String() string { return proto.CompactTextString(m) }
 func (*ConsensusParams) ProtoMessage()    {}
 func (*ConsensusParams) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{25}
+	return fileDescriptor_types_2abffab37bc29540, []int{25}
 }
 func (m *ConsensusParams) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2382,7 +2382,7 @@ func (m *BlockSize) Reset()         { *m = BlockSize{} }
 func (m *BlockSize) String() string { return proto.CompactTextString(m) }
 func (*BlockSize) ProtoMessage()    {}
 func (*BlockSize) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{26}
+	return fileDescriptor_types_2abffab37bc29540, []int{26}
 }
 func (m *BlockSize) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2445,7 +2445,7 @@ func (m *TxSize) Reset()         { *m = TxSize{} }
 func (m *TxSize) String() string { return proto.CompactTextString(m) }
 func (*TxSize) ProtoMessage()    {}
 func (*TxSize) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{27}
+	return fileDescriptor_types_2abffab37bc29540, []int{27}
 }
 func (m *TxSize) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2502,7 +2502,7 @@ func (m *BlockGossip) Reset()         { *m = BlockGossip{} }
 func (m *BlockGossip) String() string { return proto.CompactTextString(m) }
 func (*BlockGossip) ProtoMessage()    {}
 func (*BlockGossip) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{28}
+	return fileDescriptor_types_2abffab37bc29540, []int{28}
 }
 func (m *BlockGossip) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2550,7 +2550,7 @@ func (m *LastCommitInfo) Reset()         { *m = LastCommitInfo{} }
 func (m *LastCommitInfo) String() string { return proto.CompactTextString(m) }
 func (*LastCommitInfo) ProtoMessage()    {}
 func (*LastCommitInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{29}
+	return fileDescriptor_types_2abffab37bc29540, []int{29}
 }
 func (m *LastCommitInfo) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2607,17 +2607,17 @@ type Header struct {
 	ValidatorsHash []byte `protobuf:"bytes,7,opt,name=validators_hash,json=validatorsHash,proto3" json:"validators_hash,omitempty"`
 	AppHash        []byte `protobuf:"bytes,8,opt,name=app_hash,json=appHash,proto3" json:"app_hash,omitempty"`
 	// consensus
-	Proposer             Validator `protobuf:"bytes,9,opt,name=proposer" json:"proposer"`
-	XXX_NoUnkeyedLiteral struct{}  `json:"-"`
-	XXX_unrecognized     []byte    `json:"-"`
-	XXX_sizecache        int32     `json:"-"`
+	ProposerAddress      []byte   `protobuf:"bytes,9,opt,name=proposer_address,json=proposerAddress,proto3" json:"proposer_address,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
 }
 
 func (m *Header) Reset()         { *m = Header{} }
 func (m *Header) String() string { return proto.CompactTextString(m) }
 func (*Header) ProtoMessage()    {}
 func (*Header) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{30}
+	return fileDescriptor_types_2abffab37bc29540, []int{30}
 }
 func (m *Header) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2702,11 +2702,11 @@ func (m *Header) GetAppHash() []byte {
 	return nil
 }
 
-func (m *Header) GetProposer() Validator {
+func (m *Header) GetProposerAddress() []byte {
 	if m != nil {
-		return m.Proposer
+		return m.ProposerAddress
 	}
-	return Validator{}
+	return nil
 }
 
 // Validator
@@ -2723,7 +2723,7 @@ func (m *Validator) Reset()         { *m = Validator{} }
 func (m *Validator) String() string { return proto.CompactTextString(m) }
 func (*Validator) ProtoMessage()    {}
 func (*Validator) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{31}
+	return fileDescriptor_types_2abffab37bc29540, []int{31}
 }
 func (m *Validator) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2786,7 +2786,7 @@ func (m *SigningValidator) Reset()         { *m = SigningValidator{} }
 func (m *SigningValidator) String() string { return proto.CompactTextString(m) }
 func (*SigningValidator) ProtoMessage()    {}
 func (*SigningValidator) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{32}
+	return fileDescriptor_types_2abffab37bc29540, []int{32}
 }
 func (m *SigningValidator) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2841,7 +2841,7 @@ func (m *PubKey) Reset()         { *m = PubKey{} }
 func (m *PubKey) String() string { return proto.CompactTextString(m) }
 func (*PubKey) ProtoMessage()    {}
 func (*PubKey) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{33}
+	return fileDescriptor_types_2abffab37bc29540, []int{33}
 }
 func (m *PubKey) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2899,7 +2899,7 @@ func (m *Evidence) Reset()         { *m = Evidence{} }
 func (m *Evidence) String() string { return proto.CompactTextString(m) }
 func (*Evidence) ProtoMessage()    {}
 func (*Evidence) Descriptor() ([]byte, []int) {
-	return fileDescriptor_types_d8da2202f45d32c0, []int{34}
+	return fileDescriptor_types_2abffab37bc29540, []int{34}
 }
 func (m *Evidence) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -4620,7 +4620,7 @@ func (this *Header) Equal(that interface{}) bool {
 	if !bytes.Equal(this.AppHash, that1.AppHash) {
 		return false
 	}
-	if !this.Proposer.Equal(&that1.Proposer) {
+	if !bytes.Equal(this.ProposerAddress, that1.ProposerAddress) {
 		return false
 	}
 	if !bytes.Equal(this.XXX_unrecognized, that1.XXX_unrecognized) {
@@ -6675,14 +6675,12 @@ func (m *Header) MarshalTo(dAtA []byte) (int, error) {
 		i = encodeVarintTypes(dAtA, i, uint64(len(m.AppHash)))
 		i += copy(dAtA[i:], m.AppHash)
 	}
-	dAtA[i] = 0x4a
-	i++
-	i = encodeVarintTypes(dAtA, i, uint64(m.Proposer.Size()))
-	n36, err := m.Proposer.MarshalTo(dAtA[i:])
-	if err != nil {
-		return 0, err
+	if len(m.ProposerAddress) > 0 {
+		dAtA[i] = 0x4a
+		i++
+		i = encodeVarintTypes(dAtA, i, uint64(len(m.ProposerAddress)))
+		i += copy(dAtA[i:], m.ProposerAddress)
 	}
-	i += n36
 	if m.XXX_unrecognized != nil {
 		i += copy(dAtA[i:], m.XXX_unrecognized)
 	}
@@ -6713,11 +6711,11 @@ func (m *Validator) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x12
 	i++
 	i = encodeVarintTypes(dAtA, i, uint64(m.PubKey.Size()))
-	n37, err := m.PubKey.MarshalTo(dAtA[i:])
+	n36, err := m.PubKey.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n37
+	i += n36
 	if m.Power != 0 {
 		dAtA[i] = 0x18
 		i++
@@ -6747,11 +6745,11 @@ func (m *SigningValidator) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintTypes(dAtA, i, uint64(m.Validator.Size()))
-	n38, err := m.Validator.MarshalTo(dAtA[i:])
+	n37, err := m.Validator.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n38
+	i += n37
 	if m.SignedLastBlock {
 		dAtA[i] = 0x10
 		i++
@@ -6825,11 +6823,11 @@ func (m *Evidence) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x12
 	i++
 	i = encodeVarintTypes(dAtA, i, uint64(m.Validator.Size()))
-	n39, err := m.Validator.MarshalTo(dAtA[i:])
+	n38, err := m.Validator.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n39
+	i += n38
 	if m.Height != 0 {
 		dAtA[i] = 0x18
 		i++
@@ -6838,11 +6836,11 @@ func (m *Evidence) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x22
 	i++
 	i = encodeVarintTypes(dAtA, i, uint64(github_com_gogo_protobuf_types.SizeOfStdTime(m.Time)))
-	n40, err := github_com_gogo_protobuf_types.StdTimeMarshalTo(m.Time, dAtA[i:])
+	n39, err := github_com_gogo_protobuf_types.StdTimeMarshalTo(m.Time, dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n40
+	i += n39
 	if m.TotalVotingPower != 0 {
 		dAtA[i] = 0x28
 		i++
@@ -7545,8 +7543,11 @@ func NewPopulatedHeader(r randyTypes, easy bool) *Header {
 	for i := 0; i < v37; i++ {
 		this.AppHash[i] = byte(r.Intn(256))
 	}
-	v38 := NewPopulatedValidator(r, easy)
-	this.Proposer = *v38
+	v38 := r.Intn(100)
+	this.ProposerAddress = make([]byte, v38)
+	for i := 0; i < v38; i++ {
+		this.ProposerAddress[i] = byte(r.Intn(256))
+	}
 	if !easy && r.Intn(10) != 0 {
 		this.XXX_unrecognized = randUnrecognizedTypes(r, 10)
 	}
@@ -8470,8 +8471,10 @@ func (m *Header) Size() (n int) {
 	if l > 0 {
 		n += 1 + l + sovTypes(uint64(l))
 	}
-	l = m.Proposer.Size()
-	n += 1 + l + sovTypes(uint64(l))
+	l = len(m.ProposerAddress)
+	if l > 0 {
+		n += 1 + l + sovTypes(uint64(l))
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -12930,9 +12933,9 @@ func (m *Header) Unmarshal(dAtA []byte) error {
 			iNdEx = postIndex
 		case 9:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Proposer", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field ProposerAddress", wireType)
 			}
-			var msglen int
+			var byteLen int
 			for shift := uint(0); ; shift += 7 {
 				if shift >= 64 {
 					return ErrIntOverflowTypes
@@ -12942,20 +12945,21 @@ func (m *Header) Unmarshal(dAtA []byte) error {
 				}
 				b := dAtA[iNdEx]
 				iNdEx++
-				msglen |= (int(b) & 0x7F) << shift
+				byteLen |= (int(b) & 0x7F) << shift
 				if b < 0x80 {
 					break
 				}
 			}
-			if msglen < 0 {
+			if byteLen < 0 {
 				return ErrInvalidLengthTypes
 			}
-			postIndex := iNdEx + msglen
+			postIndex := iNdEx + byteLen
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			if err := m.Proposer.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
-				return err
+			m.ProposerAddress = append(m.ProposerAddress[:0], dAtA[iNdEx:postIndex]...)
+			if m.ProposerAddress == nil {
+				m.ProposerAddress = []byte{}
 			}
 			iNdEx = postIndex
 		default:
@@ -13606,134 +13610,134 @@ var (
 	ErrIntOverflowTypes   = fmt.Errorf("proto: integer overflow")
 )
 
-func init() { proto.RegisterFile("abci/types/types.proto", fileDescriptor_types_d8da2202f45d32c0) }
+func init() { proto.RegisterFile("abci/types/types.proto", fileDescriptor_types_2abffab37bc29540) }
 func init() {
-	golang_proto.RegisterFile("abci/types/types.proto", fileDescriptor_types_d8da2202f45d32c0)
-}
-
-var fileDescriptor_types_d8da2202f45d32c0 = []byte{
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+	golang_proto.RegisterFile("abci/types/types.proto", fileDescriptor_types_2abffab37bc29540)
+}
+
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+	0x9a, 0x59, 0x9f, 0xd1, 0xc5, 0xe3, 0x45, 0x42, 0x70, 0x28, 0x8f, 0xcb, 0xd6, 0x19, 0x5d, 0x7c,
+	0x48, 0xb9, 0xf1, 0x3e, 0xd4, 0xd5, 0x21, 0x5f, 0x6a, 0x63, 0x94, 0xaf, 0xe4, 0xe4, 0x7f, 0x00,
+	0xad, 0xcc, 0xb9, 0xc9, 0x77, 0xe0, 0xb6, 0xd2, 0x30, 0xa0, 0xa1, 0x90, 0x16, 0xc9, 0x6d, 0x48,
+	0x24, 0xf1, 0x9c, 0x86, 0x02, 0x3f, 0xa9, 0x0a, 0xf1, 0x10, 0x36, 0xf2, 0xc5, 0x2a, 0xf9, 0x06,
+	0xac, 0x45, 0x85, 0x6d, 0xe8, 0xcf, 0x3d, 0x3b, 0x92, 0x6d, 0xa9, 0x35, 0x13, 0x97, 0xc8, 0xf7,
+	0x4b, 0xd2, 0x76, 0x8c, 0xe8, 0x8f, 0x5c, 0xc7, 0x73, 0x3d, 0xe7, 0x45, 0xd9, 0xfb, 0x4f, 0x15,
+	0xa8, 0xab, 0xc2, 0x9a, 0xdc, 0xcb, 0x74, 0x31, 0x12, 0x35, 0x07, 0xad, 0xeb, 0xe7, 0xbb, 0x0d,
+	0x09, 0x30, 0x67, 0x1f, 0xa4, 0x2d, 0x4d, 0x9a, 0x50, 0x2b, 0xb9, 0xba, 0x3f, 0xee, 0x9f, 0x56,
+	0xbf, 0x72, 0xff, 0xb4, 0x0d, 0x0d, 0x6f, 0x3e, 0x93, 0x97, 0x55, 0x55, 0x97, 0xe5, 0xcd, 0x67,
+	0x78, 0x59, 0xaf, 0x83, 0x2e, 0x7c, 0x41, 0xa7, 0x92, 0xa4, 0x92, 0x42, 0x53, 0x2e, 0x20, 0xf1,
+	0x1e, 0xb4, 0xb3, 0x98, 0x8d, 0x18, 0xac, 0x20, 0x62, 0x3d, 0x45, 0x6c, 0xec, 0x27, 0xde, 0x80,
+	0x76, 0xaa, 0xb0, 0xe2, 0x53, 0xb0, 0xb1, 0x91, 0x2e, 0x4b, 0xc6, 0x3b, 0xd0, 0x4c, 0xd0, 0x5c,
+	0x41, 0x48, 0x83, 0x2a, 0x10, 0x27, 0xfb, 0xd0, 0x09, 0x42, 0x3f, 0xf0, 0x39, 0x0b, 0x2d, 0x6a,
+	0xdb, 0x21, 0xe3, 0x5c, 0xc2, 0xc9, 0x9a, 0xd9, 0x8e, 0xd7, 0x4f, 0xd4, 0xb2, 0xe1, 0x82, 0x9e,
+	0x18, 0x1c, 0x2b, 0x8e, 0x98, 0x5d, 0x8b, 0x76, 0x54, 0x53, 0x72, 0x00, 0x8d, 0x60, 0x3e, 0xb2,
+	0x10, 0xd8, 0xf2, 0x91, 0x72, 0x3e, 0x1f, 0x7d, 0xc4, 0xae, 0xe2, 0x36, 0x27, 0x90, 0x33, 0x09,
+	0x6d, 0xfe, 0x67, 0x2c, 0x8c, 0x7c, 0x56, 0x4d, 0x0c, 0x01, 0x9d, 0xe2, 0x15, 0x93, 0xef, 0x82,
+	0x9e, 0xa8, 0x55, 0x88, 0xd8, 0xa2, 0x1f, 0xa4, 0x8c, 0x58, 0xff, 0x70, 0xd7, 0xf1, 0x98, 0x6d,
+	0xa5, 0x26, 0x95, 0xe7, 0x6a, 0x9a, 0x6d, 0x45, 0xf8, 0x38, 0xb6, 0xa9, 0xf1, 0x6d, 0xa8, 0xab,
+	0x33, 0x62, 0x1a, 0xc1, 0x9d, 0xe3, 0x1a, 0x0b, 0xc7, 0xa5, 0xa9, 0xe5, 0x2f, 0x1a, 0x34, 0xe3,
+	0xde, 0xa9, 0x54, 0x28, 0x77, 0xe8, 0xca, 0xcb, 0x1e, 0x7a, 0x59, 0x03, 0x1a, 0x3b, 0x62, 0xf5,
+	0x2b, 0x3b, 0xe2, 0x01, 0x10, 0xe5, 0x6f, 0x97, 0xbe, 0x70, 0x3d, 0xc7, 0x52, 0x36, 0x57, 0x8e,
+	0xd7, 0x91, 0x94, 0x27, 0x92, 0x70, 0x8e, 0xeb, 0x47, 0x9f, 0xd7, 0xa0, 0x7d, 0x32, 0x38, 0x3d,
+	0x3b, 0x09, 0x82, 0xa9, 0x3b, 0xa6, 0xb2, 0xb0, 0x3b, 0x84, 0xaa, 0x2c, 0x5d, 0x4b, 0x9e, 0xcb,
+	0x7a, 0x65, 0x3d, 0x14, 0x39, 0x82, 0x9a, 0xac, 0x60, 0x49, 0xd9, 0xab, 0x59, 0xaf, 0xb4, 0x95,
+	0xc2, 0x8f, 0xa8, 0x1a, 0xf7, 0xe6, 0xe3, 0x59, 0xaf, 0xac, 0x9f, 0x22, 0xef, 0x83, 0x9e, 0xd6,
+	0x9e, 0xcb, 0x9e, 0xd0, 0x7a, 0x4b, 0x3b, 0x2b, 0x94, 0x4f, 0x81, 0x7f, 0xd9, 0x4b, 0x50, 0x6f,
+	0x69, 0x0b, 0x42, 0x8e, 0xa1, 0x11, 0x17, 0x44, 0xe5, 0x8f, 0x5c, 0xbd, 0x25, 0x5d, 0x0f, 0x9a,
+	0x47, 0x15, 0x95, 0x65, 0x2f, 0x71, 0xbd, 0xd2, 0xd6, 0x8c, 0xdc, 0x87, 0x7a, 0x84, 0x73, 0xa5,
+	0x0f, 0x5d, 0xbd, 0xf2, 0xde, 0x05, 0x95, 0x4c, 0x0b, 0xea, 0x65, 0xaf, 0x85, 0xbd, 0xa5, 0x3d,
+	0x24, 0x39, 0x01, 0xc8, 0x14, 0x92, 0x4b, 0x9f, 0x01, 0x7b, 0xcb, 0x7b, 0x43, 0xf2, 0x1e, 0x34,
+	0xd3, 0x7e, 0xbf, 0xfc, 0x61, 0xaf, 0xb7, 0xac, 0x5d, 0x1b, 0x7c, 0xed, 0x3f, 0xff, 0xdc, 0xd1,
+	0x7e, 0x7b, 0xbd, 0xa3, 0xfd, 0xfe, 0x7a, 0x47, 0xfb, 0xe2, 0x7a, 0x47, 0xfb, 0xf3, 0xf5, 0x8e,
+	0xf6, 0x8f, 0xeb, 0x1d, 0xed, 0x0f, 0x5f, 0xee, 0x68, 0xa3, 0xba, 0x74, 0xff, 0xb7, 0xff, 0x1b,
+	0x00, 0x00, 0xff, 0xff, 0x79, 0xfd, 0x53, 0xad, 0x8b, 0x16, 0x00, 0x00,
 }
diff --git a/abci/types/types.proto b/abci/types/types.proto
index 6e6b1cd36..c64ece24f 100644
--- a/abci/types/types.proto
+++ b/abci/types/types.proto
@@ -249,7 +249,7 @@ message Header {
   bytes app_hash = 8;
 
   // consensus
-  Validator proposer = 9 [(gogoproto.nullable)=false];
+  bytes proposer_address = 9;
 }
 
 // Validator
diff --git a/blockchain/reactor_test.go b/blockchain/reactor_test.go
index 11991bda4..f590fd52e 100644
--- a/blockchain/reactor_test.go
+++ b/blockchain/reactor_test.go
@@ -156,7 +156,7 @@ func makeTxs(height int64) (txs []types.Tx) {
 }
 
 func makeBlock(height int64, state sm.State) *types.Block {
-	block, _ := state.MakeBlock(height, makeTxs(height), new(types.Commit), nil)
+	block, _ := state.MakeBlock(height, makeTxs(height), new(types.Commit), nil, state.Validators.GetProposer().Address)
 	return block
 }
 
diff --git a/consensus/state.go b/consensus/state.go
index 97734d08b..a5ade13cc 100644
--- a/consensus/state.go
+++ b/consensus/state.go
@@ -949,7 +949,8 @@ func (cs *ConsensusState) createProposalBlock() (block *types.Block, blockParts
 	// Mempool validated transactions
 	txs := cs.mempool.Reap(cs.state.ConsensusParams.BlockSize.MaxTxs)
 	evidence := cs.evpool.PendingEvidence()
-	block, parts := cs.state.MakeBlock(cs.Height, txs, commit, evidence)
+	proposerAddr := cs.privValidator.GetAddress()
+	block, parts := cs.state.MakeBlock(cs.Height, txs, commit, evidence, proposerAddr)
 	return block, parts
 }
 
diff --git a/consensus/state_test.go b/consensus/state_test.go
index 6a14e17b5..d943be87e 100644
--- a/consensus/state_test.go
+++ b/consensus/state_test.go
@@ -8,10 +8,10 @@ import (
 	"time"
 
 	cstypes "github.com/tendermint/tendermint/consensus/types"
-	tmpubsub "github.com/tendermint/tendermint/libs/pubsub"
-	"github.com/tendermint/tendermint/types"
 	cmn "github.com/tendermint/tendermint/libs/common"
 	"github.com/tendermint/tendermint/libs/log"
+	tmpubsub "github.com/tendermint/tendermint/libs/pubsub"
+	"github.com/tendermint/tendermint/types"
 )
 
 func init() {
@@ -104,8 +104,9 @@ func TestStateProposerSelection2(t *testing.T) {
 	// everyone just votes nil. we get a new proposer each round
 	for i := 0; i < len(vss); i++ {
 		prop := cs1.GetRoundState().Validators.GetProposer()
-		if !bytes.Equal(prop.Address, vss[(i+2)%len(vss)].GetAddress()) {
-			panic(cmn.Fmt("expected proposer to be validator %d. Got %X", (i+2)%len(vss), prop.Address))
+		correctProposer := vss[(i+2)%len(vss)].GetAddress()
+		if !bytes.Equal(prop.Address, correctProposer) {
+			panic(cmn.Fmt("expected RoundState.Validators.GetProposer() to be validator %d. Got %X", (i+2)%len(vss), prop.Address))
 		}
 
 		rs := cs1.GetRoundState()
diff --git a/docs/spec/blockchain/blockchain.md b/docs/spec/blockchain/blockchain.md
index e3171818a..eab3acdf9 100644
--- a/docs/spec/blockchain/blockchain.md
+++ b/docs/spec/blockchain/blockchain.md
@@ -57,8 +57,8 @@ type Header struct {
     ConsensusParamsHash []byte  // SimpleMerkle of the ConsensusParams
 
     // consensus
-    Proposer            []byte  // Address of the block proposer
     EvidenceHash        []byte  // SimpleMerkle of []Evidence
+    ProposerAddress     []byte  // Address of the original proposer of the block
 }
 ```
 
@@ -300,13 +300,13 @@ block.ConsensusParamsHash == SimpleMerkleRoot(state.ConsensusParams)
 Simple Merkle root of the consensus parameters.
 May be updated by the application.
 
-### Proposer
+### ProposerAddress
 
 ```go
-block.Header.Proposer in state.Validators
+block.Header.ProposerAddress in state.Validators
 ```
 
-Original proposer of the block. Must be a current validator.
+Address of the original proposer of the block. Must be a current validator.
 
 NOTE: we also need to track the round.
 
diff --git a/state/execution_test.go b/state/execution_test.go
index 53c5c882b..d5b0dda03 100644
--- a/state/execution_test.go
+++ b/state/execution_test.go
@@ -79,7 +79,7 @@ func TestBeginBlockValidators(t *testing.T) {
 		lastCommit := &types.Commit{BlockID: prevBlockID, Precommits: tc.lastCommitPrecommits}
 
 		// block for height 2
-		block, _ := state.MakeBlock(2, makeTxs(2), lastCommit, nil)
+		block, _ := state.MakeBlock(2, makeTxs(2), lastCommit, nil, state.Validators.GetProposer().Address)
 		_, err = ExecCommitBlock(proxyApp.Consensus(), block, log.TestingLogger(), state.Validators, stateDB)
 		require.Nil(t, err, tc.desc)
 
@@ -138,7 +138,7 @@ func TestBeginBlockByzantineValidators(t *testing.T) {
 	lastCommit := &types.Commit{BlockID: prevBlockID, Precommits: votes}
 	for _, tc := range testCases {
 
-		block, _ := state.MakeBlock(10, makeTxs(2), lastCommit, nil)
+		block, _ := state.MakeBlock(10, makeTxs(2), lastCommit, nil, state.Validators.GetProposer().Address)
 		block.Time = now
 		block.Evidence.Evidence = tc.evidence
 		_, err = ExecCommitBlock(proxyApp.Consensus(), block, log.TestingLogger(), state.Validators, stateDB)
@@ -269,7 +269,7 @@ func state(nVals, height int) (State, dbm.DB) {
 }
 
 func makeBlock(state State, height int64) *types.Block {
-	block, _ := state.MakeBlock(height, makeTxs(state.LastBlockHeight), new(types.Commit), nil)
+	block, _ := state.MakeBlock(height, makeTxs(state.LastBlockHeight), new(types.Commit), nil, state.Validators.GetProposer().Address)
 	return block
 }
 
diff --git a/state/state.go b/state/state.go
index 8a8130568..0315e734e 100644
--- a/state/state.go
+++ b/state/state.go
@@ -98,12 +98,15 @@ func (state State) IsEmpty() bool {
 //------------------------------------------------------------------------
 // Create a block from the latest state
 
-// MakeBlock builds a block from the current state with the given txs, commit, and evidence.
+// MakeBlock builds a block from the current state with the given txs, commit,
+// and evidence. Note it also takes a proposerAddress because the state does not
+// track rounds, and hence doesn't know the correct proposer. TODO: alleviate this!
 func (state State) MakeBlock(
 	height int64,
 	txs []types.Tx,
 	commit *types.Commit,
 	evidence []types.Evidence,
+	proposerAddress []byte,
 ) (*types.Block, *types.PartSet) {
 
 	// Build base block with block data.
@@ -121,6 +124,10 @@ func (state State) MakeBlock(
 	block.AppHash = state.AppHash
 	block.LastResultsHash = state.LastResultsHash
 
+	// NOTE: we can't use the state.Validators because we don't
+	// IncrementAccum for rounds there.
+	block.ProposerAddress = proposerAddress
+
 	return block, block.MakePartSet(state.ConsensusParams.BlockGossip.BlockPartSizeBytes)
 }
 
diff --git a/state/state_test.go b/state/state_test.go
index ad28b0a9d..90f1cfcd7 100644
--- a/state/state_test.go
+++ b/state/state_test.go
@@ -301,6 +301,17 @@ func genValSet(size int) *types.ValidatorSet {
 	return types.NewValidatorSet(vals)
 }
 
+func TestStateMakeBlock(t *testing.T) {
+	tearDown, _, state := setupTestCase(t)
+	defer tearDown(t)
+
+	proposerAddress := state.Validators.GetProposer().Address
+	block := makeBlock(state, 2)
+
+	// test we set proposer address
+	assert.Equal(t, proposerAddress, block.ProposerAddress)
+}
+
 // TestConsensusParamsChangesSaveLoad tests saving and loading consensus params
 // with changes.
 func TestConsensusParamsChangesSaveLoad(t *testing.T) {
diff --git a/state/validation.go b/state/validation.go
index 85d0ce901..4686d82b2 100644
--- a/state/validation.go
+++ b/state/validation.go
@@ -5,8 +5,9 @@ import (
 	"errors"
 	"fmt"
 
-	"github.com/tendermint/tendermint/types"
+	"github.com/tendermint/go-crypto/tmhash"
 	dbm "github.com/tendermint/tendermint/libs/db"
+	"github.com/tendermint/tendermint/types"
 )
 
 //-----------------------------------------------------
@@ -20,10 +21,18 @@ func validateBlock(stateDB dbm.DB, state State, block *types.Block) error {
 
 	// Validate basic info.
 	if block.ChainID != state.ChainID {
-		return fmt.Errorf("Wrong Block.Header.ChainID. Expected %v, got %v", state.ChainID, block.ChainID)
+		return fmt.Errorf(
+			"Wrong Block.Header.ChainID. Expected %v, got %v",
+			state.ChainID,
+			block.ChainID,
+		)
 	}
 	if block.Height != state.LastBlockHeight+1 {
-		return fmt.Errorf("Wrong Block.Header.Height. Expected %v, got %v", state.LastBlockHeight+1, block.Height)
+		return fmt.Errorf(
+			"Wrong Block.Header.Height. Expected %v, got %v",
+			state.LastBlockHeight+1,
+			block.Height,
+		)
 	}
 	/*	TODO: Determine bounds for Time
 		See blockchain/reactor "stopSyncingDurationMinutes"
@@ -35,25 +44,49 @@ func validateBlock(stateDB dbm.DB, state State, block *types.Block) error {
 
 	// Validate prev block info.
 	if !block.LastBlockID.Equals(state.LastBlockID) {
-		return fmt.Errorf("Wrong Block.Header.LastBlockID.  Expected %v, got %v", state.LastBlockID, block.LastBlockID)
+		return fmt.Errorf(
+			"Wrong Block.Header.LastBlockID.  Expected %v, got %v",
+			state.LastBlockID,
+			block.LastBlockID,
+		)
 	}
 	newTxs := int64(len(block.Data.Txs))
 	if block.TotalTxs != state.LastBlockTotalTx+newTxs {
-		return fmt.Errorf("Wrong Block.Header.TotalTxs. Expected %v, got %v", state.LastBlockTotalTx+newTxs, block.TotalTxs)
+		return fmt.Errorf(
+			"Wrong Block.Header.TotalTxs. Expected %v, got %v",
+			state.LastBlockTotalTx+newTxs,
+			block.TotalTxs,
+		)
 	}
 
 	// Validate app info
 	if !bytes.Equal(block.AppHash, state.AppHash) {
-		return fmt.Errorf("Wrong Block.Header.AppHash.  Expected %X, got %v", state.AppHash, block.AppHash)
+		return fmt.Errorf(
+			"Wrong Block.Header.AppHash.  Expected %X, got %v",
+			state.AppHash,
+			block.AppHash,
+		)
 	}
 	if !bytes.Equal(block.ConsensusHash, state.ConsensusParams.Hash()) {
-		return fmt.Errorf("Wrong Block.Header.ConsensusHash.  Expected %X, got %v", state.ConsensusParams.Hash(), block.ConsensusHash)
+		return fmt.Errorf(
+			"Wrong Block.Header.ConsensusHash.  Expected %X, got %v",
+			state.ConsensusParams.Hash(),
+			block.ConsensusHash,
+		)
 	}
 	if !bytes.Equal(block.LastResultsHash, state.LastResultsHash) {
-		return fmt.Errorf("Wrong Block.Header.LastResultsHash.  Expected %X, got %v", state.LastResultsHash, block.LastResultsHash)
+		return fmt.Errorf(
+			"Wrong Block.Header.LastResultsHash.  Expected %X, got %v",
+			state.LastResultsHash,
+			block.LastResultsHash,
+		)
 	}
 	if !bytes.Equal(block.ValidatorsHash, state.Validators.Hash()) {
-		return fmt.Errorf("Wrong Block.Header.ValidatorsHash.  Expected %X, got %v", state.Validators.Hash(), block.ValidatorsHash)
+		return fmt.Errorf(
+			"Wrong Block.Header.ValidatorsHash.  Expected %X, got %v",
+			state.Validators.Hash(),
+			block.ValidatorsHash,
+		)
 	}
 	if !bytes.Equal(block.NextValidatorsHash, state.NextValidators.Hash()) {
 		return fmt.Errorf("Wrong Block.Header.NextValidatorsHash.  Expected %X, got %v", state.NextValidators.Hash(), block.NextValidatorsHash)
@@ -66,8 +99,11 @@ func validateBlock(stateDB dbm.DB, state State, block *types.Block) error {
 		}
 	} else {
 		if len(block.LastCommit.Precommits) != state.LastValidators.Size() {
-			return fmt.Errorf("Invalid block commit size. Expected %v, got %v",
-				state.LastValidators.Size(), len(block.LastCommit.Precommits))
+			return fmt.Errorf(
+				"Invalid block commit size. Expected %v, got %v",
+				state.LastValidators.Size(),
+				len(block.LastCommit.Precommits),
+			)
 		}
 		err := state.LastValidators.VerifyCommit(
 			state.ChainID, state.LastBlockID, block.Height-1, block.LastCommit)
@@ -86,6 +122,17 @@ func validateBlock(stateDB dbm.DB, state State, block *types.Block) error {
 		}
 	}
 
+	// NOTE: We can't actually verify it's the right proposer because we dont
+	// know what round the block was first proposed. So just check that it's
+	// a legit address and a known validator.
+	if len(block.ProposerAddress) != tmhash.Size ||
+		!state.Validators.HasAddress(block.ProposerAddress) {
+		return fmt.Errorf(
+			"Block.Header.ProposerAddress, %X, is not a validator",
+			block.ProposerAddress,
+		)
+	}
+
 	return nil
 }
 
diff --git a/state/validation_test.go b/state/validation_test.go
index 362a40737..ba76a72bc 100644
--- a/state/validation_test.go
+++ b/state/validation_test.go
@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/require"
+	"github.com/tendermint/tendermint/crypto/ed25519"
 	dbm "github.com/tendermint/tendermint/libs/db"
 	"github.com/tendermint/tendermint/libs/log"
 )
@@ -65,4 +66,13 @@ func TestValidateBlock(t *testing.T) {
 	block.ValidatorsHash = []byte("wrong validators hash")
 	err = blockExec.ValidateBlock(state, block)
 	require.Error(t, err)
+
+	// wrong proposer address
+	block = makeBlock(state, 1)
+	block.ProposerAddress = ed25519.GenPrivKey().PubKey().Address()
+	err = blockExec.ValidateBlock(state, block)
+	require.Error(t, err)
+	block.ProposerAddress = []byte("wrong size")
+	err = blockExec.ValidateBlock(state, block)
+	require.Error(t, err)
 }
diff --git a/types/block.go b/types/block.go
index fe3a2bbce..bb8169636 100644
--- a/types/block.go
+++ b/types/block.go
@@ -23,9 +23,10 @@ type Block struct {
 	LastCommit *Commit      `json:"last_commit"`
 }
 
-// MakeBlock returns a new block with an empty header, except what can be computed from itself.
-// It populates the same set of fields validated by ValidateBasic
-func MakeBlock(height int64, txs []Tx, commit *Commit, evidence []Evidence) *Block {
+// MakeBlock returns a new block with an empty header, except what can be
+// computed from itself.
+// It populates the same set of fields validated by ValidateBasic.
+func MakeBlock(height int64, txs []Tx, lastCommit *Commit, evidence []Evidence) *Block {
 	block := &Block{
 		Header: Header{
 			Height: height,
@@ -36,7 +37,7 @@ func MakeBlock(height int64, txs []Tx, commit *Commit, evidence []Evidence) *Blo
 			Txs: txs,
 		},
 		Evidence:   EvidenceData{Evidence: evidence},
-		LastCommit: commit,
+		LastCommit: lastCommit,
 	}
 	block.fillHeader()
 	return block
@@ -53,10 +54,18 @@ func (b *Block) ValidateBasic() error {
 
 	newTxs := int64(len(b.Data.Txs))
 	if b.NumTxs != newTxs {
-		return fmt.Errorf("Wrong Block.Header.NumTxs. Expected %v, got %v", newTxs, b.NumTxs)
+		return fmt.Errorf(
+			"Wrong Block.Header.NumTxs. Expected %v, got %v",
+			newTxs,
+			b.NumTxs,
+		)
 	}
 	if !bytes.Equal(b.LastCommitHash, b.LastCommit.Hash()) {
-		return fmt.Errorf("Wrong Block.Header.LastCommitHash.  Expected %v, got %v", b.LastCommitHash, b.LastCommit.Hash())
+		return fmt.Errorf(
+			"Wrong Block.Header.LastCommitHash.  Expected %v, got %v",
+			b.LastCommitHash,
+			b.LastCommit.Hash(),
+		)
 	}
 	if b.Header.Height != 1 {
 		if err := b.LastCommit.ValidateBasic(); err != nil {
@@ -64,10 +73,18 @@ func (b *Block) ValidateBasic() error {
 		}
 	}
 	if !bytes.Equal(b.DataHash, b.Data.Hash()) {
-		return fmt.Errorf("Wrong Block.Header.DataHash.  Expected %v, got %v", b.DataHash, b.Data.Hash())
+		return fmt.Errorf(
+			"Wrong Block.Header.DataHash.  Expected %v, got %v",
+			b.DataHash,
+			b.Data.Hash(),
+		)
 	}
 	if !bytes.Equal(b.EvidenceHash, b.Evidence.Hash()) {
-		return errors.New(cmn.Fmt("Wrong Block.Header.EvidenceHash.  Expected %v, got %v", b.EvidenceHash, b.Evidence.Hash()))
+		return fmt.Errorf(
+			"Wrong Block.Header.EvidenceHash.  Expected %v, got %v",
+			b.EvidenceHash,
+			b.Evidence.Hash(),
+		)
 	}
 	return nil
 }
@@ -200,7 +217,8 @@ type Header struct {
 	LastResultsHash    cmn.HexBytes `json:"last_results_hash"`    // root hash of all results from the txs from the previous block
 
 	// consensus info
-	EvidenceHash cmn.HexBytes `json:"evidence_hash"` // evidence included in the block
+	EvidenceHash    cmn.HexBytes `json:"evidence_hash"`    // evidence included in the block
+	ProposerAddress Address      `json:"proposer_address"` // original proposer of the block
 }
 
 // Hash returns the hash of the header.
@@ -226,6 +244,7 @@ func (h *Header) Hash() cmn.HexBytes {
 		"Consensus":      aminoHasher(h.ConsensusHash),
 		"Results":        aminoHasher(h.LastResultsHash),
 		"Evidence":       aminoHasher(h.EvidenceHash),
+		"Proposer":       aminoHasher(h.ProposerAddress),
 	})
 }
 
@@ -249,6 +268,7 @@ func (h *Header) StringIndented(indent string) string {
 %s  Consensus:       %v
 %s  Results:        %v
 %s  Evidence:       %v
+%s  Proposer:       %v
 %s}#%v`,
 		indent, h.ChainID,
 		indent, h.Height,
@@ -264,6 +284,7 @@ func (h *Header) StringIndented(indent string) string {
 		indent, h.ConsensusHash,
 		indent, h.LastResultsHash,
 		indent, h.EvidenceHash,
+		indent, h.ProposerAddress,
 		indent, h.Hash())
 }
 
diff --git a/types/block_test.go b/types/block_test.go
index 50695c84b..8e5957761 100644
--- a/types/block_test.go
+++ b/types/block_test.go
@@ -44,6 +44,7 @@ func TestBlockValidateBasic(t *testing.T) {
 
 	block := MakeBlock(h, txs, commit, evList)
 	require.NotNil(t, block)
+	block.ProposerAddress = valSet.GetProposer().Address
 
 	// proper block must pass
 	err = block.ValidateBasic()
diff --git a/types/protobuf.go b/types/protobuf.go
index 01d4ebf0c..571619156 100644
--- a/types/protobuf.go
+++ b/types/protobuf.go
@@ -46,7 +46,7 @@ func (tm2pb) Header(header *Header) abci.Header {
 		ValidatorsHash: header.ValidatorsHash,
 		AppHash:        header.AppHash,
 
-		// Proposer: TODO
+		ProposerAddress: header.ProposerAddress,
 	}
 }
 
diff --git a/types/protobuf_test.go b/types/protobuf_test.go
index 8711974e3..b1c012907 100644
--- a/types/protobuf_test.go
+++ b/types/protobuf_test.go
@@ -76,13 +76,15 @@ func TestABCIConsensusParams(t *testing.T) {
 
 func TestABCIHeader(t *testing.T) {
 	header := &Header{
-		Height: int64(3),
-		Time:   time.Now(),
-		NumTxs: int64(10),
+		Height:          int64(3),
+		Time:            time.Now(),
+		NumTxs:          int64(10),
+		ProposerAddress: []byte("cloak"),
 	}
 	abciHeader := TM2PB.Header(header)
 
 	assert.Equal(t, int64(3), abciHeader.Height)
+	assert.Equal(t, []byte("cloak"), abciHeader.ProposerAddress)
 }
 
 func TestABCIEvidence(t *testing.T) {