diff --git a/attr.go b/attr.go
index ab29fc9c0..86b179f27 100644
--- a/attr.go
+++ b/attr.go
@@ -348,6 +348,22 @@ func txUpdateAttrs(tx *bolt.Tx, id uint64, m map[string]interface{}) (map[string
 	return attr, nil
 }
 
+func encodeAttrsMap(m map[uint64]map[string]interface{}) map[uint64]*internal.AttrMap {
+	r := make(map[uint64]*internal.AttrMap, len(m))
+	for k, v := range m {
+		r[k] = &internal.AttrMap{Attrs: encodeAttrs(v)}
+	}
+	return r
+}
+
+func DecodeAttrsMap(m map[uint64]*internal.AttrMap) map[uint64]map[string]interface{} {
+	r := make(map[uint64]map[string]interface{}, len(m))
+	for k, v := range m {
+		r[k] = decodeAttrs(v.Attrs)
+	}
+	return r
+}
+
 func encodeAttrs(m map[string]interface{}) []*internal.Attr {
 	keys := make([]string, 0, len(m))
 	for k := range m {
@@ -438,6 +454,38 @@ type AttrBlock struct {
 	Checksum []byte `json:"checksum"`
 }
 
+// EncodeAttrBlocks converts a into its internal representation.
+func EncodeAttrBlocks(a []AttrBlock) []*internal.AttrBlock {
+	other := make([]*internal.AttrBlock, len(a))
+	for i := range a {
+		other[i] = encodeAttrBlock(&a[i])
+	}
+	return other
+}
+
+// encodeAttrBlock converts b into its internal representation.
+func encodeAttrBlock(b *AttrBlock) *internal.AttrBlock {
+	return &internal.AttrBlock{
+		ID:       b.ID,
+		Checksum: b.Checksum,
+	}
+}
+
+func decodeAttrBlocks(a []*internal.AttrBlock) []AttrBlock {
+	other := make([]AttrBlock, len(a))
+	for i := range a {
+		other[i] = decodeAttrBlock(a[i])
+	}
+	return other
+}
+
+func decodeAttrBlock(b *internal.AttrBlock) AttrBlock {
+	return AttrBlock{
+		ID:       b.ID,
+		Checksum: b.Checksum,
+	}
+}
+
 // AttrBlocks represents a list of blocks.
 type AttrBlocks []AttrBlock
 
diff --git a/client.go b/client.go
index e44d9c5de..9b2465b88 100644
--- a/client.go
+++ b/client.go
@@ -966,10 +966,12 @@ func (c *InternalHTTPClient) BlockData(ctx context.Context, index, frame, view s
 func (c *InternalHTTPClient) ColumnAttrDiff(ctx context.Context, index string, blks []AttrBlock) (map[uint64]map[string]interface{}, error) {
 	u := uriPathToURL(c.defaultURI, fmt.Sprintf("/index/%s/attr/diff", index))
 
-	// Encode request.
-	buf, err := json.Marshal(postIndexAttrDiffRequest{Blocks: blks})
+	// Encode request object.
+	buf, err := proto.Marshal(&internal.AttrBlockRequest{
+		Blocks: EncodeAttrBlocks(blks),
+	})
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("marshal column attr block request: %s", err)
 	}
 
 	// Build request.
@@ -977,7 +979,9 @@ func (c *InternalHTTPClient) ColumnAttrDiff(ctx context.Context, index string, b
 	if err != nil {
 		return nil, err
 	}
-	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Content-Length", strconv.Itoa(len(buf)))
+	req.Header.Set("Content-Type", "application/x-protobuf")
+	req.Header.Set("Accept", "application/x-protobuf")
 	req.Header.Set("User-Agent", "pilosa/"+Version)
 
 	// Execute request.
@@ -994,22 +998,31 @@ func (c *InternalHTTPClient) ColumnAttrDiff(ctx context.Context, index string, b
 		return nil, fmt.Errorf("unexpected status: code=%d", resp.StatusCode)
 	}
 
-	// Decode response object.
-	var rsp postIndexAttrDiffResponse
-	if err := json.NewDecoder(resp.Body).Decode(&rsp); err != nil {
+	// Read body.
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
 		return nil, err
 	}
-	return rsp.Attrs, nil
+
+	// Decode response object.
+	abresp := &internal.AttrBlockResponse{}
+	if err := proto.Unmarshal(body, abresp); err != nil {
+		return nil, fmt.Errorf("unmarshal attribute block response: %s", err)
+	}
+
+	return DecodeAttrsMap(abresp.Attrs), nil
 }
 
 // RowAttrDiff returns data from differing blocks on a remote host.
 func (c *InternalHTTPClient) RowAttrDiff(ctx context.Context, index, frame string, blks []AttrBlock) (map[uint64]map[string]interface{}, error) {
 	u := uriPathToURL(c.defaultURI, fmt.Sprintf("/index/%s/frame/%s/attr/diff", index, frame))
 
-	// Encode request.
-	buf, err := json.Marshal(postFrameAttrDiffRequest{Blocks: blks})
+	// Encode request object.
+	buf, err := proto.Marshal(&internal.AttrBlockRequest{
+		Blocks: EncodeAttrBlocks(blks),
+	})
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("marshal row attr block request: %s", err)
 	}
 
 	// Build request.
@@ -1017,7 +1030,9 @@ func (c *InternalHTTPClient) RowAttrDiff(ctx context.Context, index, frame strin
 	if err != nil {
 		return nil, err
 	}
-	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Content-Length", strconv.Itoa(len(buf)))
+	req.Header.Set("Content-Type", "application/x-protobuf")
+	req.Header.Set("Accept", "application/x-protobuf")
 	req.Header.Set("User-Agent", "pilosa/"+Version)
 
 	// Execute request.
@@ -1036,12 +1051,19 @@ func (c *InternalHTTPClient) RowAttrDiff(ctx context.Context, index, frame strin
 		return nil, fmt.Errorf("unexpected status: code=%d", resp.StatusCode)
 	}
 
-	// Decode response object.
-	var rsp postFrameAttrDiffResponse
-	if err := json.NewDecoder(resp.Body).Decode(&rsp); err != nil {
+	// Read body.
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
 		return nil, err
 	}
-	return rsp.Attrs, nil
+
+	// Decode response object.
+	abresp := &internal.AttrBlockResponse{}
+	if err := proto.Unmarshal(body, abresp); err != nil {
+		return nil, fmt.Errorf("unmarshal attribute block response: %s", err)
+	}
+
+	return DecodeAttrsMap(abresp.Attrs), nil
 }
 
 func (c *InternalHTTPClient) clientURI(ctx context.Context) *URI {
diff --git a/handler.go b/handler.go
index ad9e02e2e..0efe512fa 100644
--- a/handler.go
+++ b/handler.go
@@ -538,11 +538,27 @@ type patchIndexTimeQuantumResponse struct{}
 
 // handlePostIndexAttrDiff handles POST /index/attr/diff requests.
 func (h *Handler) handlePostIndexAttrDiff(w http.ResponseWriter, r *http.Request) {
+	// Verify that request is only communicating over protobufs.
+	if r.Header.Get("Content-Type") != "application/x-protobuf" {
+		http.Error(w, "Unsupported media type", http.StatusUnsupportedMediaType)
+		return
+	} else if r.Header.Get("Accept") != "application/x-protobuf" {
+		http.Error(w, "Not acceptable", http.StatusNotAcceptable)
+		return
+	}
+
 	indexName := mux.Vars(r)["index"]
 
-	// Decode request.
-	var req postIndexAttrDiffRequest
-	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+	// Read entire body.
+	body, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	// Marshal into request object.
+	var req internal.AttrBlockRequest
+	if err := proto.Unmarshal(body, &req); err != nil {
 		http.Error(w, err.Error(), http.StatusBadRequest)
 		return
 	}
@@ -563,7 +579,7 @@ func (h *Handler) handlePostIndexAttrDiff(w http.ResponseWriter, r *http.Request
 
 	// Read all attributes from all mismatched blocks.
 	attrs := make(map[uint64]map[string]interface{})
-	for _, blockID := range AttrBlocks(blks).Diff(req.Blocks) {
+	for _, blockID := range AttrBlocks(blks).Diff(decodeAttrBlocks(req.Blocks)) {
 		// Retrieve block data.
 		m, err := index.ColumnAttrStore().BlockData(blockID)
 		if err != nil {
@@ -577,20 +593,17 @@ func (h *Handler) handlePostIndexAttrDiff(w http.ResponseWriter, r *http.Request
 		}
 	}
 
-	// Encode response.
-	if err := json.NewEncoder(w).Encode(postIndexAttrDiffResponse{
-		Attrs: attrs,
-	}); err != nil {
-		h.logger().Printf("response encoding error: %s", err)
+	// Marshal response object.
+	buf, err := proto.Marshal(&internal.AttrBlockResponse{
+		Attrs: encodeAttrsMap(attrs),
+	})
+
+	// Write response.
+	if err != nil {
+		h.logger().Printf("row attr response encoding error: %s", err)
+		w.WriteHeader(http.StatusInternalServerError)
 	}
-}
-
-type postIndexAttrDiffRequest struct {
-	Blocks []AttrBlock `json:"blocks"`
-}
-
-type postIndexAttrDiffResponse struct {
-	Attrs map[uint64]map[string]interface{} `json:"attrs"`
+	w.Write(buf)
 }
 
 // handlePostFrame handles POST /frame request.
@@ -956,12 +969,28 @@ type getFrameViewsResponse struct {
 
 // handlePostFrameAttrDiff handles POST /frame/attr/diff requests.
 func (h *Handler) handlePostFrameAttrDiff(w http.ResponseWriter, r *http.Request) {
+	// Verify that request is only communicating over protobufs.
+	if r.Header.Get("Content-Type") != "application/x-protobuf" {
+		http.Error(w, "Unsupported media type", http.StatusUnsupportedMediaType)
+		return
+	} else if r.Header.Get("Accept") != "application/x-protobuf" {
+		http.Error(w, "Not acceptable", http.StatusNotAcceptable)
+		return
+	}
+
 	indexName := mux.Vars(r)["index"]
 	frameName := mux.Vars(r)["frame"]
 
-	// Decode request.
-	var req postFrameAttrDiffRequest
-	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+	// Read entire body.
+	body, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	// Marshal into request object.
+	var req internal.AttrBlockRequest
+	if err := proto.Unmarshal(body, &req); err != nil {
 		http.Error(w, err.Error(), http.StatusBadRequest)
 		return
 	}
@@ -982,7 +1011,7 @@ func (h *Handler) handlePostFrameAttrDiff(w http.ResponseWriter, r *http.Request
 
 	// Read all attributes from all mismatched blocks.
 	attrs := make(map[uint64]map[string]interface{})
-	for _, blockID := range AttrBlocks(blks).Diff(req.Blocks) {
+	for _, blockID := range AttrBlocks(blks).Diff(decodeAttrBlocks(req.Blocks)) {
 		// Retrieve block data.
 		m, err := f.RowAttrStore().BlockData(blockID)
 		if err != nil {
@@ -996,20 +1025,17 @@ func (h *Handler) handlePostFrameAttrDiff(w http.ResponseWriter, r *http.Request
 		}
 	}
 
-	// Encode response.
-	if err := json.NewEncoder(w).Encode(postFrameAttrDiffResponse{
-		Attrs: attrs,
-	}); err != nil {
-		h.logger().Printf("response encoding error: %s", err)
+	// Marshal response object.
+	buf, err := proto.Marshal(&internal.AttrBlockResponse{
+		Attrs: encodeAttrsMap(attrs),
+	})
+
+	// Write response.
+	if err != nil {
+		h.logger().Printf("row attr response encoding error: %s", err)
+		w.WriteHeader(http.StatusInternalServerError)
 	}
-}
-
-type postFrameAttrDiffRequest struct {
-	Blocks []AttrBlock `json:"blocks"`
-}
-
-type postFrameAttrDiffResponse struct {
-	Attrs map[uint64]map[string]interface{} `json:"attrs"`
+	w.Write(buf)
 }
 
 // readColumnAttrSets returns a list of column attribute objects by id.
diff --git a/handler_test.go b/handler_test.go
index 796782402..469a87c70 100644
--- a/handler_test.go
+++ b/handler_test.go
@@ -24,6 +24,7 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"reflect"
+	"strconv"
 	"strings"
 	"testing"
 
@@ -793,20 +794,53 @@ func TestHandler_Index_AttrStore_Diff(t *testing.T) {
 	blks = blks[1:]
 	blks[1].Checksum = []byte("MISMATCHED_CHECKSUM")
 
+	// Encode request object.
+	buf, err := proto.Marshal(&internal.AttrBlockRequest{
+		Blocks: pilosa.EncodeAttrBlocks(blks),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
 	// Send block checksums to determine diff.
-	resp, err := http.Post(
+	client := &http.Client{}
+	req, err := http.NewRequest(
+		"POST",
 		s.URL+"/index/i/attr/diff",
-		"application/json",
-		strings.NewReader(`{"blocks":`+string(test.MustMarshalJSON(blks))+`}`),
+		bytes.NewReader(buf),
 	)
 	if err != nil {
 		t.Fatal(err)
 	}
+	req.Header.Set("Content-Length", strconv.Itoa(len(buf)))
+	req.Header.Set("Content-Type", "application/x-protobuf")
+	req.Header.Set("Accept", "application/x-protobuf")
+	resp, err := client.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
 	defer resp.Body.Close()
 
-	// Read and validate body.
-	if body := string(test.MustReadAll(resp.Body)); body != `{"attrs":{"1":{"bar":2,"foo":1},"200":{"snowman":"☃"}}}`+"\n" {
-		t.Fatalf("unexpected body: %s", body)
+	// Read body.
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Decode response object.
+	abresp := &internal.AttrBlockResponse{}
+	if err := proto.Unmarshal(body, abresp); err != nil {
+		t.Fatal(err)
+	}
+
+	rec := pilosa.DecodeAttrsMap(abresp.Attrs)
+
+	exp := make(map[uint64]map[string]interface{})
+	exp[1] = map[string]interface{}{"bar": int64(2), "foo": int64(1)}
+	exp[200] = map[string]interface{}{"snowman": "☃"}
+
+	if !reflect.DeepEqual(rec, exp) {
+		t.Fatalf("\nexpected: %s\n\ngot: %s\n", exp, rec)
 	}
 }
 
@@ -843,20 +877,53 @@ func TestHandler_Frame_AttrStore_Diff(t *testing.T) {
 	blks = blks[1:]
 	blks[1].Checksum = []byte("MISMATCHED_CHECKSUM")
 
+	// Encode request object.
+	buf, err := proto.Marshal(&internal.AttrBlockRequest{
+		Blocks: pilosa.EncodeAttrBlocks(blks),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
 	// Send block checksums to determine diff.
-	resp, err := http.Post(
+	client := &http.Client{}
+	req, err := http.NewRequest(
+		"POST",
 		s.URL+"/index/i/frame/meta/attr/diff",
-		"application/json",
-		strings.NewReader(`{"blocks":`+string(test.MustMarshalJSON(blks))+`}`),
+		bytes.NewReader(buf),
 	)
 	if err != nil {
 		t.Fatal(err)
 	}
+	req.Header.Set("Content-Length", strconv.Itoa(len(buf)))
+	req.Header.Set("Content-Type", "application/x-protobuf")
+	req.Header.Set("Accept", "application/x-protobuf")
+	resp, err := client.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
 	defer resp.Body.Close()
 
-	// Read and validate body.
-	if body := string(test.MustReadAll(resp.Body)); body != `{"attrs":{"1":{"bar":2,"foo":1},"200":{"snowman":"☃"}}}`+"\n" {
-		t.Fatalf("unexpected body: %s", body)
+	// Read body.
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Decode response object.
+	abresp := &internal.AttrBlockResponse{}
+	if err := proto.Unmarshal(body, abresp); err != nil {
+		t.Fatal(err)
+	}
+
+	rec := pilosa.DecodeAttrsMap(abresp.Attrs)
+
+	exp := make(map[uint64]map[string]interface{})
+	exp[1] = map[string]interface{}{"bar": int64(2), "foo": int64(1)}
+	exp[200] = map[string]interface{}{"snowman": "☃"}
+
+	if !reflect.DeepEqual(rec, exp) {
+		t.Fatalf("\nexpected: %s\n\ngot: %s\n", exp, rec)
 	}
 }
 
diff --git a/internal/private.pb.go b/internal/private.pb.go
index e5cc6516f..ce4a1838b 100644
--- a/internal/private.pb.go
+++ b/internal/private.pb.go
@@ -32,6 +32,8 @@
 		FrameSchema
 		Field
 		DeleteViewMessage
+		AttrBlock
+		AttrBlockRequest
 */
 package internal
 
@@ -768,6 +770,47 @@ func (m *DeleteViewMessage) GetView() string {
 	return ""
 }
 
+// AttrBlock represents a checksummed block of the attribute store.
+type AttrBlock struct {
+	ID       uint64 `protobuf:"varint,1,opt,name=ID,proto3" json:"ID,omitempty"`
+	Checksum []byte `protobuf:"bytes,2,opt,name=Checksum,proto3" json:"Checksum,omitempty"`
+}
+
+func (m *AttrBlock) Reset()                    { *m = AttrBlock{} }
+func (m *AttrBlock) String() string            { return proto.CompactTextString(m) }
+func (*AttrBlock) ProtoMessage()               {}
+func (*AttrBlock) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{24} }
+
+func (m *AttrBlock) GetID() uint64 {
+	if m != nil {
+		return m.ID
+	}
+	return 0
+}
+
+func (m *AttrBlock) GetChecksum() []byte {
+	if m != nil {
+		return m.Checksum
+	}
+	return nil
+}
+
+type AttrBlockRequest struct {
+	Blocks []*AttrBlock `protobuf:"bytes,1,rep,name=Blocks" json:"Blocks,omitempty"`
+}
+
+func (m *AttrBlockRequest) Reset()                    { *m = AttrBlockRequest{} }
+func (m *AttrBlockRequest) String() string            { return proto.CompactTextString(m) }
+func (*AttrBlockRequest) ProtoMessage()               {}
+func (*AttrBlockRequest) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{25} }
+
+func (m *AttrBlockRequest) GetBlocks() []*AttrBlock {
+	if m != nil {
+		return m.Blocks
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterType((*IndexMeta)(nil), "internal.IndexMeta")
 	proto.RegisterType((*FrameMeta)(nil), "internal.FrameMeta")
@@ -793,6 +836,8 @@ func init() {
 	proto.RegisterType((*FrameSchema)(nil), "internal.FrameSchema")
 	proto.RegisterType((*Field)(nil), "internal.Field")
 	proto.RegisterType((*DeleteViewMessage)(nil), "internal.DeleteViewMessage")
+	proto.RegisterType((*AttrBlock)(nil), "internal.AttrBlock")
+	proto.RegisterType((*AttrBlockRequest)(nil), "internal.AttrBlockRequest")
 }
 func (m *IndexMeta) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
@@ -1762,6 +1807,65 @@ func (m *DeleteViewMessage) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
+func (m *AttrBlock) 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 *AttrBlock) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	if m.ID != 0 {
+		dAtA[i] = 0x8
+		i++
+		i = encodeVarintPrivate(dAtA, i, uint64(m.ID))
+	}
+	if len(m.Checksum) > 0 {
+		dAtA[i] = 0x12
+		i++
+		i = encodeVarintPrivate(dAtA, i, uint64(len(m.Checksum)))
+		i += copy(dAtA[i:], m.Checksum)
+	}
+	return i, nil
+}
+
+func (m *AttrBlockRequest) 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 *AttrBlockRequest) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	if len(m.Blocks) > 0 {
+		for _, msg := range m.Blocks {
+			dAtA[i] = 0xa
+			i++
+			i = encodeVarintPrivate(dAtA, i, uint64(msg.Size()))
+			n, err := msg.MarshalTo(dAtA[i:])
+			if err != nil {
+				return 0, err
+			}
+			i += n
+		}
+	}
+	return i, nil
+}
+
 func encodeVarintPrivate(dAtA []byte, offset int, v uint64) int {
 	for v >= 1<<7 {
 		dAtA[offset] = uint8(v&0x7f | 0x80)
@@ -2201,6 +2305,31 @@ func (m *DeleteViewMessage) Size() (n int) {
 	return n
 }
 
+func (m *AttrBlock) Size() (n int) {
+	var l int
+	_ = l
+	if m.ID != 0 {
+		n += 1 + sovPrivate(uint64(m.ID))
+	}
+	l = len(m.Checksum)
+	if l > 0 {
+		n += 1 + l + sovPrivate(uint64(l))
+	}
+	return n
+}
+
+func (m *AttrBlockRequest) Size() (n int) {
+	var l int
+	_ = l
+	if len(m.Blocks) > 0 {
+		for _, e := range m.Blocks {
+			l = e.Size()
+			n += 1 + l + sovPrivate(uint64(l))
+		}
+	}
+	return n
+}
+
 func sovPrivate(x uint64) (n int) {
 	for {
 		n++
@@ -5509,6 +5638,187 @@ func (m *DeleteViewMessage) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *AttrBlock) 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 ErrIntOverflowPrivate
+			}
+			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: AttrBlock: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: AttrBlock: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ID", wireType)
+			}
+			m.ID = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowPrivate
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.ID |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Checksum", wireType)
+			}
+			var byteLen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowPrivate
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				byteLen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if byteLen < 0 {
+				return ErrInvalidLengthPrivate
+			}
+			postIndex := iNdEx + byteLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Checksum = append(m.Checksum[:0], dAtA[iNdEx:postIndex]...)
+			if m.Checksum == nil {
+				m.Checksum = []byte{}
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipPrivate(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthPrivate
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *AttrBlockRequest) 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 ErrIntOverflowPrivate
+			}
+			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: AttrBlockRequest: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: AttrBlockRequest: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Blocks", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowPrivate
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthPrivate
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Blocks = append(m.Blocks, &AttrBlock{})
+			if err := m.Blocks[len(m.Blocks)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipPrivate(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthPrivate
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func skipPrivate(dAtA []byte) (n int, err error) {
 	l := len(dAtA)
 	iNdEx := 0
@@ -5617,65 +5927,68 @@ var (
 func init() { proto.RegisterFile("private.proto", fileDescriptorPrivate) }
 
 var fileDescriptorPrivate = []byte{
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+	0xcf, 0xd0, 0x7a, 0xf9, 0x95, 0xe7, 0x79, 0xfc, 0xeb, 0x18, 0x97, 0xb7, 0x33, 0x33, 0x17, 0x39,
+	0xd5, 0xb1, 0x6c, 0x62, 0x99, 0x0a, 0xcb, 0x64, 0xea, 0x03, 0xca, 0x6b, 0xda, 0x72, 0x17, 0xfa,
+	0x80, 0xc2, 0xb9, 0xd9, 0x56, 0xe5, 0x64, 0x92, 0xbc, 0xa2, 0xcb, 0x49, 0x4b, 0xde, 0x21, 0x34,
+	0xfd, 0x68, 0x3c, 0x91, 0x3d, 0xfc, 0x31, 0x88, 0x02, 0x19, 0xc4, 0x51, 0xda, 0xaa, 0x92, 0xa9,
+	0x87, 0x45, 0x46, 0x33, 0x1a, 0x7c, 0xe1, 0x08, 0xfb, 0xd5, 0x81, 0x8d, 0x39, 0x70, 0xc9, 0xa5,
+	0x2d, 0xdf, 0xd2, 0x6a, 0xbe, 0x8f, 0xb3, 0x06, 0x57, 0x26, 0xc5, 0xf6, 0x52, 0x36, 0xb3, 0xfd,
+	0xee, 0x0f, 0x07, 0xb6, 0xae, 0x53, 0xb8, 0x96, 0x4d, 0x1b, 0xe0, 0xdb, 0x24, 0x18, 0x89, 0x64,
+	0xfa, 0x15, 0x4e, 0x4d, 0xaf, 0x2f, 0x20, 0xde, 0xf7, 0xf0, 0x60, 0xce, 0xd6, 0xd3, 0xa1, 0x0e,
+	0x91, 0x26, 0xf5, 0xee, 0x52, 0x52, 0x5a, 0x8f, 0x2f, 0x39, 0xce, 0xfe, 0x73, 0xe0, 0x9d, 0x6b,
+	0xb7, 0xf2, 0x7c, 0x74, 0x8a, 0xa9, 0xbf, 0x07, 0xcd, 0x57, 0xaa, 0x55, 0xf4, 0x30, 0x95, 0x41,
+	0x24, 0x94, 0xa6, 0x49, 0xd8, 0x05, 0xdc, 0xf3, 0xa1, 0x46, 0x58, 0x5f, 0x8c, 0x0d, 0xcd, 0x0f,
+	0x6f, 0xa0, 0xb9, 0x6f, 0xf5, 0x75, 0x4f, 0xcb, 0x8e, 0x2b, 0x32, 0xd4, 0x75, 0x6d, 0x0b, 0x27,
+	0x61, 0xfb, 0x09, 0xac, 0xcd, 0x1c, 0xb8, 0x55, 0x9f, 0x8b, 0x61, 0xc7, 0xf6, 0x96, 0x19, 0x26,
+	0xab, 0xab, 0xf4, 0x53, 0x80, 0x5c, 0xd5, 0x34, 0x80, 0x15, 0xf9, 0x59, 0x50, 0x66, 0x47, 0xb0,
+	0x63, 0x1b, 0xdf, 0x2d, 0x1c, 0xda, 0x6c, 0x29, 0xe5, 0xd9, 0xc2, 0xa6, 0x00, 0x2f, 0xe2, 0x13,
+	0x1c, 0x48, 0x21, 0x27, 0xa9, 0xd2, 0x38, 0x8a, 0x53, 0x69, 0xf3, 0x49, 0xad, 0xa9, 0x31, 0x4b,
+	0x21, 0xb3, 0x66, 0x42, 0x82, 0xf7, 0x3e, 0xdc, 0x23, 0xa3, 0x68, 0xd3, 0x66, 0x63, 0xae, 0xd6,
+	0xb9, 0xdd, 0xa7, 0x2a, 0x1d, 0x9e, 0xe2, 0x48, 0x7f, 0x9a, 0x75, 0x6e, 0x24, 0xf6, 0x04, 0xd6,
+	0xba, 0xe1, 0x24, 0x95, 0x98, 0x18, 0xef, 0x7b, 0x50, 0x51, 0x5c, 0xec, 0x97, 0xb5, 0x95, 0x5b,
+	0xcc, 0x29, 0x72, 0xad, 0xc2, 0x1e, 0x43, 0x83, 0xb2, 0x88, 0x6c, 0x89, 0xc2, 0xe8, 0xe0, 0xac,
+	0x1e, 0x1d, 0x06, 0x50, 0x59, 0x5e, 0x3a, 0x1e, 0xb8, 0x34, 0xfd, 0x98, 0x00, 0xd1, 0xe0, 0xd3,
+	0x84, 0x72, 0x3f, 0xd0, 0xcf, 0x53, 0xe6, 0x6a, 0x49, 0x88, 0xb8, 0xa4, 0xcb, 0x28, 0x44, 0xa8,
+	0xbf, 0x65, 0x53, 0x3f, 0x87, 0xfa, 0xf9, 0xef, 0xf2, 0x0b, 0xd8, 0x01, 0xa2, 0x5c, 0x18, 0x20,
+	0x3e, 0x86, 0xfa, 0x53, 0x29, 0x13, 0x3d, 0x77, 0xac, 0x43, 0xc9, 0xef, 0x91, 0x25, 0x97, 0x97,
+	0xfc, 0x9e, 0x6a, 0x9f, 0xdd, 0x53, 0x1c, 0x9e, 0xa5, 0x66, 0x3a, 0xbc, 0xcf, 0x33, 0x99, 0x7d,
+	0x01, 0xcd, 0xec, 0xa0, 0x9d, 0x7c, 0x3e, 0x80, 0x2a, 0xc9, 0x36, 0x3e, 0x85, 0xce, 0x9c, 0xeb,
+	0x1a, 0x95, 0x67, 0xcd, 0x3f, 0xaf, 0xda, 0xce, 0x5f, 0x57, 0x6d, 0xe7, 0xef, 0xab, 0xb6, 0xf3,
+	0xdb, 0x3f, 0xed, 0xb7, 0x8e, 0xab, 0x34, 0xcf, 0x7e, 0xf4, 0x26, 0x00, 0x00, 0xff, 0xff, 0x13,
+	0x56, 0xc4, 0x2f, 0xe0, 0x0a, 0x00, 0x00,
 }
diff --git a/internal/private.proto b/internal/private.proto
index 083316ddd..c70f90f9f 100644
--- a/internal/private.proto
+++ b/internal/private.proto
@@ -139,3 +139,13 @@ message DeleteViewMessage {
     string Frame = 2;
     string View = 3;
 }
+
+// AttrBlock represents a checksummed block of the attribute store.
+message AttrBlock {
+    uint64 ID = 1;
+    bytes Checksum = 2;
+}
+
+message AttrBlockRequest {
+    repeated AttrBlock Blocks = 1;
+}
diff --git a/internal/public.pb.go b/internal/public.pb.go
index 2b39cf4fb..30178f993 100644
--- a/internal/public.pb.go
+++ b/internal/public.pb.go
@@ -20,6 +20,7 @@
 		QueryResult
 		ImportRequest
 		ImportValueRequest
+		AttrBlockResponse
 */
 package internal
 
@@ -490,6 +491,22 @@ func (m *ImportValueRequest) GetValues() []int64 {
 	return nil
 }
 
+type AttrBlockResponse struct {
+	Attrs map[uint64]*AttrMap `protobuf:"bytes,1,rep,name=Attrs" json:"Attrs,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value"`
+}
+
+func (m *AttrBlockResponse) Reset()                    { *m = AttrBlockResponse{} }
+func (m *AttrBlockResponse) String() string            { return proto.CompactTextString(m) }
+func (*AttrBlockResponse) ProtoMessage()               {}
+func (*AttrBlockResponse) Descriptor() ([]byte, []int) { return fileDescriptorPublic, []int{12} }
+
+func (m *AttrBlockResponse) GetAttrs() map[uint64]*AttrMap {
+	if m != nil {
+		return m.Attrs
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterType((*Bitmap)(nil), "internal.Bitmap")
 	proto.RegisterType((*Pair)(nil), "internal.Pair")
@@ -503,6 +520,7 @@ func init() {
 	proto.RegisterType((*QueryResult)(nil), "internal.QueryResult")
 	proto.RegisterType((*ImportRequest)(nil), "internal.ImportRequest")
 	proto.RegisterType((*ImportValueRequest)(nil), "internal.ImportValueRequest")
+	proto.RegisterType((*AttrBlockResponse)(nil), "internal.AttrBlockResponse")
 }
 func (m *Bitmap) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
@@ -1118,6 +1136,51 @@ func (m *ImportValueRequest) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
+func (m *AttrBlockResponse) 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 *AttrBlockResponse) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	if len(m.Attrs) > 0 {
+		for k, _ := range m.Attrs {
+			dAtA[i] = 0xa
+			i++
+			v := m.Attrs[k]
+			msgSize := 0
+			if v != nil {
+				msgSize = v.Size()
+				msgSize += 1 + sovPublic(uint64(msgSize))
+			}
+			mapSize := 1 + sovPublic(uint64(k)) + msgSize
+			i = encodeVarintPublic(dAtA, i, uint64(mapSize))
+			dAtA[i] = 0x8
+			i++
+			i = encodeVarintPublic(dAtA, i, uint64(k))
+			if v != nil {
+				dAtA[i] = 0x12
+				i++
+				i = encodeVarintPublic(dAtA, i, uint64(v.Size()))
+				n17, err := v.MarshalTo(dAtA[i:])
+				if err != nil {
+					return 0, err
+				}
+				i += n17
+			}
+		}
+	}
+	return i, nil
+}
+
 func encodeVarintPublic(dAtA []byte, offset int, v uint64) int {
 	for v >= 1<<7 {
 		dAtA[offset] = uint8(v&0x7f | 0x80)
@@ -1388,6 +1451,25 @@ func (m *ImportValueRequest) Size() (n int) {
 	return n
 }
 
+func (m *AttrBlockResponse) Size() (n int) {
+	var l int
+	_ = l
+	if len(m.Attrs) > 0 {
+		for k, v := range m.Attrs {
+			_ = k
+			_ = v
+			l = 0
+			if v != nil {
+				l = v.Size()
+				l += 1 + sovPublic(uint64(l))
+			}
+			mapEntrySize := 1 + sovPublic(uint64(k)) + l
+			n += mapEntrySize + 1 + sovPublic(uint64(mapEntrySize))
+		}
+	}
+	return n
+}
+
 func sovPublic(x uint64) (n int) {
 	for {
 		n++
@@ -3326,6 +3408,168 @@ func (m *ImportValueRequest) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *AttrBlockResponse) 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 ErrIntOverflowPublic
+			}
+			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: AttrBlockResponse: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: AttrBlockResponse: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Attrs", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowPublic
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthPublic
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.Attrs == nil {
+				m.Attrs = make(map[uint64]*AttrMap)
+			}
+			var mapkey uint64
+			var mapvalue *AttrMap
+			for iNdEx < postIndex {
+				entryPreIndex := iNdEx
+				var wire uint64
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowPublic
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					wire |= (uint64(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				fieldNum := int32(wire >> 3)
+				if fieldNum == 1 {
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return ErrIntOverflowPublic
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						mapkey |= (uint64(b) & 0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+				} else if fieldNum == 2 {
+					var mapmsglen int
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return ErrIntOverflowPublic
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						mapmsglen |= (int(b) & 0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+					if mapmsglen < 0 {
+						return ErrInvalidLengthPublic
+					}
+					postmsgIndex := iNdEx + mapmsglen
+					if mapmsglen < 0 {
+						return ErrInvalidLengthPublic
+					}
+					if postmsgIndex > l {
+						return io.ErrUnexpectedEOF
+					}
+					mapvalue = &AttrMap{}
+					if err := mapvalue.Unmarshal(dAtA[iNdEx:postmsgIndex]); err != nil {
+						return err
+					}
+					iNdEx = postmsgIndex
+				} else {
+					iNdEx = entryPreIndex
+					skippy, err := skipPublic(dAtA[iNdEx:])
+					if err != nil {
+						return err
+					}
+					if skippy < 0 {
+						return ErrInvalidLengthPublic
+					}
+					if (iNdEx + skippy) > postIndex {
+						return io.ErrUnexpectedEOF
+					}
+					iNdEx += skippy
+				}
+			}
+			m.Attrs[mapkey] = mapvalue
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipPublic(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthPublic
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func skipPublic(dAtA []byte) (n int, err error) {
 	l := len(dAtA)
 	iNdEx := 0
@@ -3434,46 +3678,50 @@ var (
 func init() { proto.RegisterFile("public.proto", fileDescriptorPublic) }
 
 var fileDescriptorPublic = []byte{
-	// 651 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xac, 0x54, 0xcb, 0x6e, 0xd3, 0x40,
-	0x14, 0x65, 0x62, 0xe7, 0x75, 0x93, 0x56, 0xd5, 0x08, 0x8a, 0x85, 0x50, 0x14, 0x59, 0x2c, 0xbc,
-	0x4a, 0xa5, 0xf0, 0x01, 0x08, 0xb7, 0xa9, 0x64, 0x21, 0x2a, 0x98, 0x14, 0xf6, 0x6e, 0x3b, 0x2a,
-	0x96, 0xfc, 0x62, 0x3c, 0x16, 0xed, 0x77, 0xb0, 0x61, 0xcd, 0x06, 0x7e, 0x80, 0x1d, 0x1f, 0xc0,
-	0x92, 0x4f, 0x40, 0xe1, 0x47, 0xd0, 0xbd, 0xe3, 0x89, 0x1d, 0x16, 0xc0, 0x82, 0xdd, 0x9c, 0x73,
-	0x1f, 0xbe, 0x8f, 0x73, 0x0d, 0xd3, 0xb2, 0xbe, 0x48, 0x93, 0xcb, 0x45, 0xa9, 0x0a, 0x5d, 0xf0,
-	0x51, 0x92, 0x6b, 0xa9, 0xf2, 0x38, 0xf5, 0x43, 0x18, 0x84, 0x89, 0xce, 0xe2, 0x92, 0x73, 0x70,
-	0xc3, 0x44, 0x57, 0x1e, 0x9b, 0x3b, 0x81, 0x2b, 0xe8, 0xcd, 0x1f, 0x41, 0xff, 0xa9, 0xd6, 0xaa,
-	0xf2, 0x7a, 0x73, 0x27, 0x98, 0x2c, 0xf7, 0x17, 0x36, 0x6e, 0x81, 0xb4, 0x30, 0x46, 0x7f, 0x01,
-	0xee, 0x8b, 0x38, 0x51, 0xfc, 0x00, 0x9c, 0x67, 0xf2, 0xd6, 0x63, 0x73, 0x16, 0xb8, 0x02, 0x9f,
-	0xfc, 0x2e, 0xf4, 0x8f, 0x8b, 0x3a, 0xd7, 0x5e, 0x8f, 0x38, 0x03, 0xfc, 0x25, 0x8c, 0xd6, 0x75,
-	0x46, 0x6f, 0x8c, 0x59, 0xd7, 0x19, 0xc5, 0x38, 0x02, 0x9f, 0xbb, 0x31, 0x8e, 0x8d, 0x79, 0x05,
-	0x4e, 0x98, 0x68, 0x34, 0x8a, 0xe2, 0x5d, 0x74, 0xd2, 0x7c, 0xc4, 0x00, 0xfe, 0x00, 0x46, 0xc7,
-	0x45, 0x5a, 0x67, 0x79, 0x74, 0xd2, 0x7c, 0x69, 0x8b, 0xf9, 0x43, 0x18, 0x9f, 0x27, 0x99, 0xac,
-	0x74, 0x9c, 0x95, 0x9e, 0x43, 0x29, 0x5b, 0xc2, 0x5f, 0xc1, 0x9e, 0xf1, 0xc4, 0x4e, 0xd6, 0x52,
-	0xf3, 0x7d, 0xe8, 0x6d, 0xb3, 0xf7, 0xa2, 0x93, 0x7f, 0x9c, 0xc0, 0x67, 0x06, 0x2e, 0xbe, 0xba,
-	0x23, 0x18, 0x9b, 0x11, 0x70, 0x70, 0xcf, 0x6f, 0x4b, 0xd9, 0xd4, 0x45, 0x6f, 0x3e, 0x87, 0xc9,
-	0x5a, 0xab, 0x24, 0xbf, 0x7e, 0x1d, 0xa7, 0xb5, 0xa4, 0xaa, 0xc6, 0xa2, 0x4b, 0x61, 0x47, 0x51,
-	0xae, 0x8d, 0xd9, 0xa5, 0xa2, 0xb7, 0x18, 0x3b, 0x0a, 0x8b, 0x22, 0x35, 0xc6, 0xfe, 0x9c, 0x05,
-	0x23, 0xd1, 0x12, 0x7c, 0x06, 0x70, 0x9a, 0x16, 0x71, 0x13, 0x3b, 0x98, 0xb3, 0x80, 0x89, 0x0e,
-	0xe3, 0x1f, 0xc1, 0x10, 0x2b, 0x7d, 0x1e, 0x97, 0x6d, 0x6f, 0xec, 0x4f, 0xbd, 0x7d, 0x65, 0x30,
-	0x7d, 0x59, 0x4b, 0x75, 0x2b, 0xe4, 0xdb, 0x5a, 0x56, 0xb4, 0x03, 0xc2, 0x4d, 0x97, 0x06, 0xf0,
-	0x43, 0x18, 0xac, 0xd3, 0xe4, 0x52, 0x9a, 0x49, 0xb9, 0xa2, 0x41, 0xd8, 0x6b, 0x3b, 0xe1, 0x8a,
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-	0x5a, 0x29, 0x65, 0x77, 0xb4, 0x52, 0x8a, 0x1f, 0xc1, 0x50, 0xc8, 0xaa, 0x4e, 0xb5, 0x5d, 0xf3,
-	0xbd, 0x76, 0x14, 0x36, 0xb6, 0x4e, 0xb5, 0xb0, 0x5e, 0xfc, 0x09, 0xec, 0xef, 0xc8, 0x06, 0xfb,
-	0xc2, 0xb8, 0xfb, 0x6d, 0xdc, 0x8e, 0x5d, 0xfc, 0xe6, 0xee, 0x7f, 0x61, 0x30, 0xe9, 0x64, 0xe6,
-	0x81, 0x3d, 0x43, 0x2a, 0x6b, 0xb2, 0x3c, 0x68, 0x13, 0x19, 0x5e, 0xd8, 0x33, 0x9d, 0x02, 0x3b,
-	0x6b, 0xc4, 0xc4, 0xce, 0x70, 0x85, 0x78, 0x7a, 0xf6, 0xfb, 0x9d, 0x15, 0x22, 0x2d, 0x8c, 0x91,
-	0x7b, 0x30, 0x3c, 0x7e, 0x13, 0xe7, 0xd7, 0xf2, 0x8a, 0xc4, 0x34, 0x12, 0x16, 0xf2, 0x45, 0x7b,
-	0x8a, 0x34, 0xfd, 0xc9, 0x92, 0xb7, 0x29, 0xac, 0x45, 0x6c, 0x7d, 0xfc, 0x4f, 0x0c, 0xf6, 0xa2,
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 }
diff --git a/internal/public.proto b/internal/public.proto
index 47b04d8e7..43faca7dd 100644
--- a/internal/public.proto
+++ b/internal/public.proto
@@ -81,3 +81,7 @@ message ImportValueRequest {
 	repeated uint64 ColumnIDs = 5;
 	repeated int64 Values = 6;
 }
+
+message AttrBlockResponse {
+    map<uint64, AttrMap> Attrs = 1;
+}