diff --git a/client/client.go b/client/client.go
index be1383e4b..d1954e3fe 100644
--- a/client/client.go
+++ b/client/client.go
@@ -33,11 +33,11 @@ type Client interface {
 	CommitSync() (res types.Result)
 
 	InitChainAsync(validators []*types.Validator) *ReqRes
-	BeginBlockAsync(header *types.Header) *ReqRes
+	BeginBlockAsync(hash []byte, header *types.Header) *ReqRes
 	EndBlockAsync(height uint64) *ReqRes
 
 	InitChainSync(validators []*types.Validator) (err error)
-	BeginBlockSync(header *types.Header) (err error)
+	BeginBlockSync(hash []byte, header *types.Header) (err error)
 	EndBlockSync(height uint64) (changedValidators []*types.Validator, err error)
 }
 
diff --git a/client/grpc_client.go b/client/grpc_client.go
index 36589322a..1e0169738 100644
--- a/client/grpc_client.go
+++ b/client/grpc_client.go
@@ -200,8 +200,8 @@ func (cli *grpcClient) InitChainAsync(validators []*types.Validator) *ReqRes {
 	return cli.finishAsyncCall(req, &types.Response{&types.Response_InitChain{res}})
 }
 
-func (cli *grpcClient) BeginBlockAsync(header *types.Header) *ReqRes {
-	req := types.ToRequestBeginBlock(header)
+func (cli *grpcClient) BeginBlockAsync(hash []byte, header *types.Header) *ReqRes {
+	req := types.ToRequestBeginBlock(hash, header)
 	res, err := cli.client.BeginBlock(context.Background(), req.GetBeginBlock(), grpc.FailFast(true))
 	if err != nil {
 		cli.StopForError(err)
@@ -321,8 +321,8 @@ func (cli *grpcClient) InitChainSync(validators []*types.Validator) (err error)
 	return cli.Error()
 }
 
-func (cli *grpcClient) BeginBlockSync(header *types.Header) (err error) {
-	cli.BeginBlockAsync(header)
+func (cli *grpcClient) BeginBlockSync(hash []byte, header *types.Header) (err error) {
+	cli.BeginBlockAsync(hash, header)
 	return cli.Error()
 }
 
diff --git a/client/local_client.go b/client/local_client.go
index 0ce735c80..e50763a8d 100644
--- a/client/local_client.go
+++ b/client/local_client.go
@@ -122,14 +122,14 @@ func (app *localClient) InitChainAsync(validators []*types.Validator) *ReqRes {
 	return reqRes
 }
 
-func (app *localClient) BeginBlockAsync(header *types.Header) *ReqRes {
+func (app *localClient) BeginBlockAsync(hash []byte, header *types.Header) *ReqRes {
 	app.mtx.Lock()
 	if bcApp, ok := app.Application.(types.BlockchainAware); ok {
-		bcApp.BeginBlock(header)
+		bcApp.BeginBlock(hash, header)
 	}
 	app.mtx.Unlock()
 	return app.callback(
-		types.ToRequestBeginBlock(header),
+		types.ToRequestBeginBlock(hash, header),
 		types.ToResponseBeginBlock(),
 	)
 }
@@ -208,10 +208,10 @@ func (app *localClient) InitChainSync(validators []*types.Validator) (err error)
 	return nil
 }
 
-func (app *localClient) BeginBlockSync(header *types.Header) (err error) {
+func (app *localClient) BeginBlockSync(hash []byte, header *types.Header) (err error) {
 	app.mtx.Lock()
 	if bcApp, ok := app.Application.(types.BlockchainAware); ok {
-		bcApp.BeginBlock(header)
+		bcApp.BeginBlock(hash, header)
 	}
 	app.mtx.Unlock()
 	return nil
diff --git a/client/socket_client.go b/client/socket_client.go
index 18dc0b0e4..01a330366 100644
--- a/client/socket_client.go
+++ b/client/socket_client.go
@@ -263,8 +263,8 @@ func (cli *socketClient) InitChainAsync(validators []*types.Validator) *ReqRes {
 	return cli.queueRequest(types.ToRequestInitChain(validators))
 }
 
-func (cli *socketClient) BeginBlockAsync(header *types.Header) *ReqRes {
-	return cli.queueRequest(types.ToRequestBeginBlock(header))
+func (cli *socketClient) BeginBlockAsync(hash []byte, header *types.Header) *ReqRes {
+	return cli.queueRequest(types.ToRequestBeginBlock(hash, header))
 }
 
 func (cli *socketClient) EndBlockAsync(height uint64) *ReqRes {
@@ -361,8 +361,8 @@ func (cli *socketClient) InitChainSync(validators []*types.Validator) (err error
 	return nil
 }
 
-func (cli *socketClient) BeginBlockSync(header *types.Header) (err error) {
-	cli.queueRequest(types.ToRequestBeginBlock(header))
+func (cli *socketClient) BeginBlockSync(hash []byte, header *types.Header) (err error) {
+	cli.queueRequest(types.ToRequestBeginBlock(hash, header))
 	cli.FlushSync()
 	if err := cli.Error(); err != nil {
 		return err
diff --git a/example/dummy/persistent_dummy.go b/example/dummy/persistent_dummy.go
index 60e677e99..df46b8d14 100644
--- a/example/dummy/persistent_dummy.go
+++ b/example/dummy/persistent_dummy.go
@@ -47,6 +47,10 @@ func SaveLastBlock(db dbm.DB, lastBlock types.LastBlockInfo) {
 type PersistentDummyApplication struct {
 	app *DummyApplication
 	db  dbm.DB
+
+	// latest received
+	blockHash   []byte
+	blockHeader *types.Header
 }
 
 func NewPersistentDummyApplication(dbDir string) *PersistentDummyApplication {
@@ -88,9 +92,16 @@ func (app *PersistentDummyApplication) CheckTx(tx []byte) types.Result {
 
 func (app *PersistentDummyApplication) Commit() types.Result {
 	// Save
-	hash := app.app.state.Save()
-	log.Info("Saved state", "root", hash)
-	return types.NewResultOK(hash, "")
+	appHash := app.app.state.Save()
+	log.Info("Saved state", "root", appHash)
+
+	lastBlock := types.LastBlockInfo{
+		BlockHeight: app.blockHeader.Height,
+		BlockHash:   app.blockHash,
+		AppHash:     appHash, // this hash will be in the next block header
+	}
+	SaveLastBlock(app.db, lastBlock)
+	return types.NewResultOK(appHash, "")
 }
 
 func (app *PersistentDummyApplication) Query(query []byte) types.Result {
@@ -101,15 +112,9 @@ func (app *PersistentDummyApplication) InitChain(validators []*types.Validator)
 	return
 }
 
-func (app *PersistentDummyApplication) BeginBlock(header *types.Header) {
-	// we commit the previous block state on BeginBlock because thats
-	// when we get the prev block hash and the app hash
-	lastBlock := types.LastBlockInfo{
-		BlockHeight: header.Height - 1,
-		BlockHash:   header.LastBlockHash,
-		AppHash:     header.AppHash,
-	}
-	SaveLastBlock(app.db, lastBlock)
+func (app *PersistentDummyApplication) BeginBlock(hash []byte, header *types.Header) {
+	app.blockHash = hash
+	app.blockHeader = header
 }
 
 func (app *PersistentDummyApplication) EndBlock(height uint64) (diffs []*types.Validator) {
diff --git a/server/socket_server.go b/server/socket_server.go
index fb141aa9e..43b4ed638 100644
--- a/server/socket_server.go
+++ b/server/socket_server.go
@@ -192,7 +192,7 @@ func (s *SocketServer) handleRequest(req *types.Request, responses chan<- *types
 		responses <- types.ToResponseInitChain()
 	case *types.Request_BeginBlock:
 		if app, ok := s.app.(types.BlockchainAware); ok {
-			app.BeginBlock(r.BeginBlock.Header)
+			app.BeginBlock(r.BeginBlock.Hash, r.BeginBlock.Header)
 		}
 		responses <- types.ToResponseBeginBlock()
 	case *types.Request_EndBlock:
diff --git a/types/application.go b/types/application.go
index ba6565f54..0137f1e1a 100644
--- a/types/application.go
+++ b/types/application.go
@@ -34,7 +34,7 @@ type BlockchainAware interface {
 	InitChain(validators []*Validator)
 
 	// Signals the beginning of a block
-	BeginBlock(header *Header)
+	BeginBlock(hash []byte, header *Header)
 
 	// Signals the end of a block
 	// diffs: changed validators from app to TendermintCore
@@ -96,7 +96,7 @@ func (app *GRPCApplication) InitChain(ctx context.Context, req *RequestInitChain
 
 func (app *GRPCApplication) BeginBlock(ctx context.Context, req *RequestBeginBlock) (*ResponseBeginBlock, error) {
 	if chainAware, ok := app.app.(BlockchainAware); ok {
-		chainAware.BeginBlock(req.Header)
+		chainAware.BeginBlock(req.Hash, req.Header)
 	}
 	return &ResponseBeginBlock{}, nil
 }
diff --git a/types/messages.go b/types/messages.go
index 304289e47..16e4fbd2b 100644
--- a/types/messages.go
+++ b/types/messages.go
@@ -61,9 +61,9 @@ func ToRequestInitChain(validators []*Validator) *Request {
 	}
 }
 
-func ToRequestBeginBlock(header *Header) *Request {
+func ToRequestBeginBlock(hash []byte, header *Header) *Request {
 	return &Request{
-		Value: &Request_BeginBlock{&RequestBeginBlock{header}},
+		Value: &Request_BeginBlock{&RequestBeginBlock{hash, header}},
 	}
 }
 
diff --git a/types/types.pb.go b/types/types.pb.go
index d8251961b..3eafb4832 100644
--- a/types/types.pb.go
+++ b/types/types.pb.go
@@ -758,7 +758,8 @@ func (m *RequestInitChain) GetValidators() []*Validator {
 }
 
 type RequestBeginBlock struct {
-	Header *Header `protobuf:"bytes,1,opt,name=header" json:"header,omitempty"`
+	Hash   []byte  `protobuf:"bytes,1,opt,name=hash,proto3" json:"hash,omitempty"`
+	Header *Header `protobuf:"bytes,2,opt,name=header" json:"header,omitempty"`
 }
 
 func (m *RequestBeginBlock) Reset()                    { *m = RequestBeginBlock{} }
@@ -766,6 +767,13 @@ func (m *RequestBeginBlock) String() string            { return proto.CompactTex
 func (*RequestBeginBlock) ProtoMessage()               {}
 func (*RequestBeginBlock) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{10} }
 
+func (m *RequestBeginBlock) GetHash() []byte {
+	if m != nil {
+		return m.Hash
+	}
+	return nil
+}
+
 func (m *RequestBeginBlock) GetHeader() *Header {
 	if m != nil {
 		return m.Header
@@ -2117,113 +2125,114 @@ var _TMSPApplication_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("types/types.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 1721 bytes of a gzipped FileDescriptorProto
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+	0xde, 0x94, 0xb3, 0x4d, 0x64, 0xd0, 0xff, 0xc6, 0xb3, 0x62, 0xb1, 0xf0, 0x43, 0xe7, 0x1d, 0xb7,
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+	0x78, 0x1c, 0xa8, 0x05, 0x68, 0x26, 0xb8, 0xaf, 0xfa, 0x0c, 0x2b, 0x9e, 0xf0, 0xa3, 0xaa, 0xa1,
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+	0xf9, 0xa0, 0x1f, 0x55, 0x0d, 0xe8, 0xf8, 0x45, 0xae, 0xbd, 0x71, 0xdd, 0xb3, 0x7e, 0xb4, 0x76,
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+	0x81, 0xd5, 0x4f, 0xfc, 0xd1, 0x9a, 0x91, 0x9d, 0x62, 0xa3, 0x26, 0x91, 0xaa, 0x97, 0xfb, 0xa8,
+	0x72, 0x0a, 0xc7, 0x4f, 0x13, 0x40, 0xc2, 0xca, 0x7f, 0x07, 0x46, 0xd5, 0xb3, 0x3e, 0x45, 0x28,
+	0x7b, 0x3f, 0xae, 0x7b, 0xf6, 0x8f, 0xd6, 0x4e, 0xf1, 0xf8, 0x38, 0x8f, 0x70, 0xb8, 0xf6, 0xf1,
+	0x3f, 0x5a, 0x3f, 0xcb, 0x53, 0x90, 0xb3, 0xc7, 0x62, 0xf5, 0x5f, 0x00, 0xa3, 0x75, 0xe3, 0xfc,
+	0x65, 0x4b, 0xfe, 0xb5, 0xf4, 0xe0, 0xfb, 0x00, 0x00, 0x00, 0xff, 0xff, 0x70, 0x47, 0x17, 0xd1,
+	0x6f, 0x12, 0x00, 0x00,
 }
diff --git a/types/types.proto b/types/types.proto
index e2c7d9b4a..7b6a7915a 100644
--- a/types/types.proto
+++ b/types/types.proto
@@ -124,7 +124,8 @@ message RequestInitChain{
 }
 
 message RequestBeginBlock{
-	Header header = 1;
+	bytes hash = 1;
+	Header header = 2;
 }
 
 message RequestEndBlock{