diff --git a/CHANGELOG_PENDING.md b/CHANGELOG_PENDING.md
index d031baa26..7ad7cab91 100644
--- a/CHANGELOG_PENDING.md
+++ b/CHANGELOG_PENDING.md
@@ -68,6 +68,9 @@ program](https://hackerone.com/tendermint).
   - [libs/common] \#3262 Make error the last parameter of `Task` (@PSalant726)
   - [cs/types] \#3262 Rename `GotVoteFromUnwantedRoundError` to `ErrGotVoteFromUnwantedRound` (@PSalant726)
   - [libs/common] \#3862 Remove `errors.go` from `libs/common`
+  - [libs/common] \#4230 Move `KV` out of common to its own pkg
+  - [libs/common] \#4230 Rename `cmn.KVPair(s)` to `kv.Pair(s)`s
+
 
 - Blockchain Protocol
 
diff --git a/Makefile b/Makefile
index f440e945b..39ccc092b 100644
--- a/Makefile
+++ b/Makefile
@@ -95,7 +95,7 @@ get_deps_bin_size:
 ########################################
 ### Libs
 
-protoc_libs: libs/common/types.pb.go
+protoc_libs: libs/kv/types.pb.go
 
 # generates certificates for TLS testing in remotedb and RPC server
 gen_certs: clean_certs
diff --git a/UPGRADING.md b/UPGRADING.md
index fc98982a7..3defa8ec8 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -61,7 +61,7 @@ Prior to the update, suppose your `ResponseDeliverTx` look like:
 
 ```go
 abci.ResponseDeliverTx{
-  Tags: []cmn.KVPair{
+  Tags: []kv.Pair{
     {Key: []byte("sender"), Value: []byte("foo")},
     {Key: []byte("recipient"), Value: []byte("bar")},
     {Key: []byte("amount"), Value: []byte("35")},
@@ -85,7 +85,7 @@ abci.ResponseDeliverTx{
   Events: []abci.Event{
     {
       Type: "transfer",
-      Attributes: cmn.KVPairs{
+      Attributes: kv.Pairs{
         {Key: []byte("sender"), Value: []byte("foo")},
         {Key: []byte("recipient"), Value: []byte("bar")},
         {Key: []byte("amount"), Value: []byte("35")},
diff --git a/abci/example/kvstore/kvstore.go b/abci/example/kvstore/kvstore.go
index 963a0797e..b23563090 100644
--- a/abci/example/kvstore/kvstore.go
+++ b/abci/example/kvstore/kvstore.go
@@ -8,7 +8,7 @@ import (
 
 	"github.com/tendermint/tendermint/abci/example/code"
 	"github.com/tendermint/tendermint/abci/types"
-	cmn "github.com/tendermint/tendermint/libs/common"
+	"github.com/tendermint/tendermint/libs/kv"
 	"github.com/tendermint/tendermint/version"
 	dbm "github.com/tendermint/tm-db"
 )
@@ -91,7 +91,7 @@ func (app *Application) DeliverTx(req types.RequestDeliverTx) types.ResponseDeli
 	events := []types.Event{
 		{
 			Type: "app",
-			Attributes: []cmn.KVPair{
+			Attributes: []kv.Pair{
 				{Key: []byte("creator"), Value: []byte("Cosmoshi Netowoko")},
 				{Key: []byte("key"), Value: key},
 			},
diff --git a/abci/types/messages_test.go b/abci/types/messages_test.go
index e0c0978ea..3aead256f 100644
--- a/abci/types/messages_test.go
+++ b/abci/types/messages_test.go
@@ -9,7 +9,7 @@ import (
 	"github.com/gogo/protobuf/proto"
 	"github.com/stretchr/testify/assert"
 
-	cmn "github.com/tendermint/tendermint/libs/common"
+	"github.com/tendermint/tendermint/libs/kv"
 )
 
 func TestMarshalJSON(t *testing.T) {
@@ -24,7 +24,7 @@ func TestMarshalJSON(t *testing.T) {
 		Events: []Event{
 			{
 				Type: "testEvent",
-				Attributes: []cmn.KVPair{
+				Attributes: []kv.Pair{
 					{Key: []byte("pho"), Value: []byte("bo")},
 				},
 			},
@@ -91,7 +91,7 @@ func TestWriteReadMessage2(t *testing.T) {
 			Events: []Event{
 				{
 					Type: "testEvent",
-					Attributes: []cmn.KVPair{
+					Attributes: []kv.Pair{
 						{Key: []byte("abc"), Value: []byte("def")},
 					},
 				},
diff --git a/abci/types/types.pb.go b/abci/types/types.pb.go
index 38103d33c..928529e01 100644
--- a/abci/types/types.pb.go
+++ b/abci/types/types.pb.go
@@ -13,7 +13,7 @@ import (
 	golang_proto "github.com/golang/protobuf/proto"
 	_ "github.com/golang/protobuf/ptypes/timestamp"
 	merkle "github.com/tendermint/tendermint/crypto/merkle"
-	common "github.com/tendermint/tendermint/libs/common"
+	kv "github.com/tendermint/tendermint/libs/kv"
 	grpc "google.golang.org/grpc"
 	codes "google.golang.org/grpc/codes"
 	status "google.golang.org/grpc/status"
@@ -121,37 +121,37 @@ type isRequest_Value interface {
 }
 
 type Request_Echo struct {
-	Echo *RequestEcho `protobuf:"bytes,2,opt,name=echo,proto3,oneof"`
+	Echo *RequestEcho `protobuf:"bytes,2,opt,name=echo,proto3,oneof" json:"echo,omitempty"`
 }
 type Request_Flush struct {
-	Flush *RequestFlush `protobuf:"bytes,3,opt,name=flush,proto3,oneof"`
+	Flush *RequestFlush `protobuf:"bytes,3,opt,name=flush,proto3,oneof" json:"flush,omitempty"`
 }
 type Request_Info struct {
-	Info *RequestInfo `protobuf:"bytes,4,opt,name=info,proto3,oneof"`
+	Info *RequestInfo `protobuf:"bytes,4,opt,name=info,proto3,oneof" json:"info,omitempty"`
 }
 type Request_SetOption struct {
-	SetOption *RequestSetOption `protobuf:"bytes,5,opt,name=set_option,json=setOption,proto3,oneof"`
+	SetOption *RequestSetOption `protobuf:"bytes,5,opt,name=set_option,json=setOption,proto3,oneof" json:"set_option,omitempty"`
 }
 type Request_InitChain struct {
-	InitChain *RequestInitChain `protobuf:"bytes,6,opt,name=init_chain,json=initChain,proto3,oneof"`
+	InitChain *RequestInitChain `protobuf:"bytes,6,opt,name=init_chain,json=initChain,proto3,oneof" json:"init_chain,omitempty"`
 }
 type Request_Query struct {
-	Query *RequestQuery `protobuf:"bytes,7,opt,name=query,proto3,oneof"`
+	Query *RequestQuery `protobuf:"bytes,7,opt,name=query,proto3,oneof" json:"query,omitempty"`
 }
 type Request_BeginBlock struct {
-	BeginBlock *RequestBeginBlock `protobuf:"bytes,8,opt,name=begin_block,json=beginBlock,proto3,oneof"`
+	BeginBlock *RequestBeginBlock `protobuf:"bytes,8,opt,name=begin_block,json=beginBlock,proto3,oneof" json:"begin_block,omitempty"`
 }
 type Request_CheckTx struct {
-	CheckTx *RequestCheckTx `protobuf:"bytes,9,opt,name=check_tx,json=checkTx,proto3,oneof"`
+	CheckTx *RequestCheckTx `protobuf:"bytes,9,opt,name=check_tx,json=checkTx,proto3,oneof" json:"check_tx,omitempty"`
 }
 type Request_DeliverTx struct {
-	DeliverTx *RequestDeliverTx `protobuf:"bytes,19,opt,name=deliver_tx,json=deliverTx,proto3,oneof"`
+	DeliverTx *RequestDeliverTx `protobuf:"bytes,19,opt,name=deliver_tx,json=deliverTx,proto3,oneof" json:"deliver_tx,omitempty"`
 }
 type Request_EndBlock struct {
-	EndBlock *RequestEndBlock `protobuf:"bytes,11,opt,name=end_block,json=endBlock,proto3,oneof"`
+	EndBlock *RequestEndBlock `protobuf:"bytes,11,opt,name=end_block,json=endBlock,proto3,oneof" json:"end_block,omitempty"`
 }
 type Request_Commit struct {
-	Commit *RequestCommit `protobuf:"bytes,12,opt,name=commit,proto3,oneof"`
+	Commit *RequestCommit `protobuf:"bytes,12,opt,name=commit,proto3,oneof" json:"commit,omitempty"`
 }
 
 func (*Request_Echo) isRequest_Value()       {}
@@ -942,40 +942,40 @@ type isResponse_Value interface {
 }
 
 type Response_Exception struct {
-	Exception *ResponseException `protobuf:"bytes,1,opt,name=exception,proto3,oneof"`
+	Exception *ResponseException `protobuf:"bytes,1,opt,name=exception,proto3,oneof" json:"exception,omitempty"`
 }
 type Response_Echo struct {
-	Echo *ResponseEcho `protobuf:"bytes,2,opt,name=echo,proto3,oneof"`
+	Echo *ResponseEcho `protobuf:"bytes,2,opt,name=echo,proto3,oneof" json:"echo,omitempty"`
 }
 type Response_Flush struct {
-	Flush *ResponseFlush `protobuf:"bytes,3,opt,name=flush,proto3,oneof"`
+	Flush *ResponseFlush `protobuf:"bytes,3,opt,name=flush,proto3,oneof" json:"flush,omitempty"`
 }
 type Response_Info struct {
-	Info *ResponseInfo `protobuf:"bytes,4,opt,name=info,proto3,oneof"`
+	Info *ResponseInfo `protobuf:"bytes,4,opt,name=info,proto3,oneof" json:"info,omitempty"`
 }
 type Response_SetOption struct {
-	SetOption *ResponseSetOption `protobuf:"bytes,5,opt,name=set_option,json=setOption,proto3,oneof"`
+	SetOption *ResponseSetOption `protobuf:"bytes,5,opt,name=set_option,json=setOption,proto3,oneof" json:"set_option,omitempty"`
 }
 type Response_InitChain struct {
-	InitChain *ResponseInitChain `protobuf:"bytes,6,opt,name=init_chain,json=initChain,proto3,oneof"`
+	InitChain *ResponseInitChain `protobuf:"bytes,6,opt,name=init_chain,json=initChain,proto3,oneof" json:"init_chain,omitempty"`
 }
 type Response_Query struct {
-	Query *ResponseQuery `protobuf:"bytes,7,opt,name=query,proto3,oneof"`
+	Query *ResponseQuery `protobuf:"bytes,7,opt,name=query,proto3,oneof" json:"query,omitempty"`
 }
 type Response_BeginBlock struct {
-	BeginBlock *ResponseBeginBlock `protobuf:"bytes,8,opt,name=begin_block,json=beginBlock,proto3,oneof"`
+	BeginBlock *ResponseBeginBlock `protobuf:"bytes,8,opt,name=begin_block,json=beginBlock,proto3,oneof" json:"begin_block,omitempty"`
 }
 type Response_CheckTx struct {
-	CheckTx *ResponseCheckTx `protobuf:"bytes,9,opt,name=check_tx,json=checkTx,proto3,oneof"`
+	CheckTx *ResponseCheckTx `protobuf:"bytes,9,opt,name=check_tx,json=checkTx,proto3,oneof" json:"check_tx,omitempty"`
 }
 type Response_DeliverTx struct {
-	DeliverTx *ResponseDeliverTx `protobuf:"bytes,10,opt,name=deliver_tx,json=deliverTx,proto3,oneof"`
+	DeliverTx *ResponseDeliverTx `protobuf:"bytes,10,opt,name=deliver_tx,json=deliverTx,proto3,oneof" json:"deliver_tx,omitempty"`
 }
 type Response_EndBlock struct {
-	EndBlock *ResponseEndBlock `protobuf:"bytes,11,opt,name=end_block,json=endBlock,proto3,oneof"`
+	EndBlock *ResponseEndBlock `protobuf:"bytes,11,opt,name=end_block,json=endBlock,proto3,oneof" json:"end_block,omitempty"`
 }
 type Response_Commit struct {
-	Commit *ResponseCommit `protobuf:"bytes,12,opt,name=commit,proto3,oneof"`
+	Commit *ResponseCommit `protobuf:"bytes,12,opt,name=commit,proto3,oneof" json:"commit,omitempty"`
 }
 
 func (*Response_Exception) isResponse_Value()  {}
@@ -2185,11 +2185,11 @@ func (m *LastCommitInfo) GetVotes() []VoteInfo {
 }
 
 type Event struct {
-	Type                 string          `protobuf:"bytes,1,opt,name=type,proto3" json:"type,omitempty"`
-	Attributes           []common.KVPair `protobuf:"bytes,2,rep,name=attributes,proto3" json:"attributes,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}        `json:"-"`
-	XXX_unrecognized     []byte          `json:"-"`
-	XXX_sizecache        int32           `json:"-"`
+	Type                 string    `protobuf:"bytes,1,opt,name=type,proto3" json:"type,omitempty"`
+	Attributes           []kv.Pair `protobuf:"bytes,2,rep,name=attributes,proto3" json:"attributes,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}  `json:"-"`
+	XXX_unrecognized     []byte    `json:"-"`
+	XXX_sizecache        int32     `json:"-"`
 }
 
 func (m *Event) Reset()         { *m = Event{} }
@@ -2232,7 +2232,7 @@ func (m *Event) GetType() string {
 	return ""
 }
 
-func (m *Event) GetAttributes() []common.KVPair {
+func (m *Event) GetAttributes() []kv.Pair {
 	if m != nil {
 		return m.Attributes
 	}
@@ -2952,152 +2952,152 @@ func init() { proto.RegisterFile("abci/types/types.proto", fileDescriptor_9f1eaa
 func init() { golang_proto.RegisterFile("abci/types/types.proto", fileDescriptor_9f1eaa49c51fa1ac) }
 
 var fileDescriptor_9f1eaa49c51fa1ac = []byte{
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+	0x2f, 0xcd, 0x3c, 0xcd, 0x20, 0x62, 0xc2, 0x2a, 0x96, 0xba, 0x24, 0xcf, 0x93, 0x4c, 0x33, 0x57,
+	0x8f, 0x48, 0x6c, 0x12, 0x0d, 0x2e, 0xc7, 0x4b, 0x4d, 0x33, 0x4f, 0xe3, 0x88, 0x7c, 0x06, 0x7a,
+	0x52, 0xc3, 0xe6, 0x7d, 0xbf, 0x69, 0xe6, 0x6e, 0x29, 0x09, 0xf9, 0x49, 0xd6, 0x9e, 0xf7, 0xf5,
+	0xa2, 0x99, 0xbb, 0x97, 0x42, 0x1e, 0x43, 0x25, 0xaa, 0x8f, 0xf2, 0xbd, 0xb0, 0x34, 0x73, 0xb6,
+	0x7b, 0xc4, 0xf5, 0xc9, 0xb2, 0x36, 0xcf, 0x33, 0x52, 0x33, 0x57, 0x4f, 0x8b, 0x3c, 0x82, 0xb2,
+	0x4a, 0x4c, 0x73, 0xbd, 0x9d, 0x34, 0xf3, 0x35, 0x71, 0x84, 0x92, 0x93, 0xc6, 0x41, 0xde, 0xa7,
+	0xb3, 0x66, 0xee, 0x66, 0x1e, 0xa1, 0x00, 0xa9, 0x5a, 0x37, 0xf7, 0x9b, 0x58, 0x33, 0x7f, 0x93,
+	0x8e, 0xfc, 0x0c, 0xaa, 0x71, 0x45, 0x93, 0xf3, 0x6d, 0xaa, 0x99, 0xb7, 0x4f, 0xd6, 0xee, 0xfe,
+	0xf7, 0xef, 0x5b, 0xda, 0xef, 0x4e, 0xb7, 0xb4, 0x2f, 0x4e, 0xb7, 0xb4, 0x2f, 0x4f, 0xb7, 0xb4,
+	0x3f, 0x9f, 0x6e, 0x69, 0x7f, 0x3b, 0xdd, 0xd2, 0xfe, 0xf8, 0x8f, 0x2d, 0xed, 0xa7, 0xdf, 0x5e,
+	0xfa, 0xba, 0x9b, 0xbc, 0x4c, 0xf7, 0xca, 0x18, 0xb0, 0xbe, 0xfb, 0xbf, 0x00, 0x00, 0x00, 0xff,
+	0xff, 0x83, 0x66, 0x2e, 0x0b, 0xae, 0x1e, 0x00, 0x00,
 }
 
 func (this *Request) Equal(that interface{}) bool {
@@ -5490,7 +5490,8 @@ func (m *Request) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 }
 
 func (m *Request_Echo) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Request_Echo) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -5510,7 +5511,8 @@ func (m *Request_Echo) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Request_Flush) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Request_Flush) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -5530,7 +5532,8 @@ func (m *Request_Flush) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Request_Info) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Request_Info) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -5550,7 +5553,8 @@ func (m *Request_Info) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Request_SetOption) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Request_SetOption) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -5570,7 +5574,8 @@ func (m *Request_SetOption) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Request_InitChain) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Request_InitChain) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -5590,7 +5595,8 @@ func (m *Request_InitChain) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Request_Query) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Request_Query) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -5610,7 +5616,8 @@ func (m *Request_Query) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Request_BeginBlock) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Request_BeginBlock) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -5630,7 +5637,8 @@ func (m *Request_BeginBlock) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Request_CheckTx) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Request_CheckTx) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -5650,7 +5658,8 @@ func (m *Request_CheckTx) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Request_EndBlock) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Request_EndBlock) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -5670,7 +5679,8 @@ func (m *Request_EndBlock) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Request_Commit) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Request_Commit) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -5690,7 +5700,8 @@ func (m *Request_Commit) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Request_DeliverTx) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Request_DeliverTx) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -6225,7 +6236,8 @@ func (m *Response) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 }
 
 func (m *Response_Exception) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Response_Exception) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -6245,7 +6257,8 @@ func (m *Response_Exception) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Response_Echo) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Response_Echo) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -6265,7 +6278,8 @@ func (m *Response_Echo) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Response_Flush) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Response_Flush) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -6285,7 +6299,8 @@ func (m *Response_Flush) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Response_Info) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Response_Info) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -6305,7 +6320,8 @@ func (m *Response_Info) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Response_SetOption) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Response_SetOption) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -6325,7 +6341,8 @@ func (m *Response_SetOption) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Response_InitChain) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Response_InitChain) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -6345,7 +6362,8 @@ func (m *Response_InitChain) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Response_Query) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Response_Query) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -6365,7 +6383,8 @@ func (m *Response_Query) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Response_BeginBlock) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Response_BeginBlock) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -6385,7 +6404,8 @@ func (m *Response_BeginBlock) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Response_CheckTx) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Response_CheckTx) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -6405,7 +6425,8 @@ func (m *Response_CheckTx) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Response_DeliverTx) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Response_DeliverTx) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -6425,7 +6446,8 @@ func (m *Response_DeliverTx) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Response_EndBlock) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Response_EndBlock) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -6445,7 +6467,8 @@ func (m *Response_EndBlock) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 func (m *Response_Commit) MarshalTo(dAtA []byte) (int, error) {
-	return m.MarshalToSizedBuffer(dAtA[:m.Size()])
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
 func (m *Response_Commit) MarshalToSizedBuffer(dAtA []byte) (int, error) {
@@ -8522,9 +8545,9 @@ func NewPopulatedEvent(r randyTypes, easy bool) *Event {
 	this.Type = string(randStringTypes(r))
 	if r.Intn(5) != 0 {
 		v34 := r.Intn(5)
-		this.Attributes = make([]common.KVPair, v34)
+		this.Attributes = make([]kv.Pair, v34)
 		for i := 0; i < v34; i++ {
-			v35 := common.NewPopulatedKVPair(r, easy)
+			v35 := kv.NewPopulatedPair(r, easy)
 			this.Attributes[i] = *v35
 		}
 	}
@@ -14631,7 +14654,7 @@ func (m *Event) Unmarshal(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Attributes = append(m.Attributes, common.KVPair{})
+			m.Attributes = append(m.Attributes, kv.Pair{})
 			if err := m.Attributes[len(m.Attributes)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
 				return err
 			}
@@ -16124,6 +16147,7 @@ func (m *Evidence) Unmarshal(dAtA []byte) error {
 func skipTypes(dAtA []byte) (n int, err error) {
 	l := len(dAtA)
 	iNdEx := 0
+	depth := 0
 	for iNdEx < l {
 		var wire uint64
 		for shift := uint(0); ; shift += 7 {
@@ -16155,10 +16179,8 @@ func skipTypes(dAtA []byte) (n int, err error) {
 					break
 				}
 			}
-			return iNdEx, nil
 		case 1:
 			iNdEx += 8
-			return iNdEx, nil
 		case 2:
 			var length int
 			for shift := uint(0); ; shift += 7 {
@@ -16179,55 +16201,30 @@ func skipTypes(dAtA []byte) (n int, err error) {
 				return 0, ErrInvalidLengthTypes
 			}
 			iNdEx += length
-			if iNdEx < 0 {
-				return 0, ErrInvalidLengthTypes
-			}
-			return iNdEx, nil
 		case 3:
-			for {
-				var innerWire uint64
-				var start int = iNdEx
-				for shift := uint(0); ; shift += 7 {
-					if shift >= 64 {
-						return 0, ErrIntOverflowTypes
-					}
-					if iNdEx >= l {
-						return 0, io.ErrUnexpectedEOF
-					}
-					b := dAtA[iNdEx]
-					iNdEx++
-					innerWire |= (uint64(b) & 0x7F) << shift
-					if b < 0x80 {
-						break
-					}
-				}
-				innerWireType := int(innerWire & 0x7)
-				if innerWireType == 4 {
-					break
-				}
-				next, err := skipTypes(dAtA[start:])
-				if err != nil {
-					return 0, err
-				}
-				iNdEx = start + next
-				if iNdEx < 0 {
-					return 0, ErrInvalidLengthTypes
-				}
-			}
-			return iNdEx, nil
+			depth++
 		case 4:
-			return iNdEx, nil
+			if depth == 0 {
+				return 0, ErrUnexpectedEndOfGroupTypes
+			}
+			depth--
 		case 5:
 			iNdEx += 4
-			return iNdEx, nil
 		default:
 			return 0, fmt.Errorf("proto: illegal wireType %d", wireType)
 		}
+		if iNdEx < 0 {
+			return 0, ErrInvalidLengthTypes
+		}
+		if depth == 0 {
+			return iNdEx, nil
+		}
 	}
-	panic("unreachable")
+	return 0, io.ErrUnexpectedEOF
 }
 
 var (
-	ErrInvalidLengthTypes = fmt.Errorf("proto: negative length found during unmarshaling")
-	ErrIntOverflowTypes   = fmt.Errorf("proto: integer overflow")
+	ErrInvalidLengthTypes        = fmt.Errorf("proto: negative length found during unmarshaling")
+	ErrIntOverflowTypes          = fmt.Errorf("proto: integer overflow")
+	ErrUnexpectedEndOfGroupTypes = fmt.Errorf("proto: unexpected end of group")
 )
diff --git a/abci/types/types.proto b/abci/types/types.proto
index d9986b1df..146e25e65 100644
--- a/abci/types/types.proto
+++ b/abci/types/types.proto
@@ -6,7 +6,7 @@ option go_package = "github.com/tendermint/tendermint/abci/types";
 // https://github.com/gogo/protobuf/blob/master/extensions.md
 import "github.com/gogo/protobuf/gogoproto/gogo.proto";
 import "github.com/tendermint/tendermint/crypto/merkle/merkle.proto";
-import "github.com/tendermint/tendermint/libs/common/types.proto";
+import "github.com/tendermint/tendermint/libs/kv/types.proto";
 import "google/protobuf/timestamp.proto";
 
 // This file is copied from http://github.com/tendermint/abci
@@ -245,7 +245,7 @@ message LastCommitInfo {
 
 message Event {
   string type = 1;
-  repeated tendermint.libs.common.KVPair attributes = 2 [(gogoproto.nullable)=false, (gogoproto.jsontag)="attributes,omitempty"];
+  repeated tendermint.libs.kv.Pair attributes = 2 [(gogoproto.nullable)=false, (gogoproto.jsontag)="attributes,omitempty"];
 }
 
 //----------------------------------------
diff --git a/abci/types/typespb_test.go b/abci/types/typespb_test.go
index e900d3841..8c9e4120c 100644
--- a/abci/types/typespb_test.go
+++ b/abci/types/typespb_test.go
@@ -12,7 +12,7 @@ import (
 	golang_proto "github.com/golang/protobuf/proto"
 	_ "github.com/golang/protobuf/ptypes/timestamp"
 	_ "github.com/tendermint/tendermint/crypto/merkle"
-	_ "github.com/tendermint/tendermint/libs/common"
+	_ "github.com/tendermint/tendermint/libs/kv"
 	math "math"
 	math_rand "math/rand"
 	testing "testing"
diff --git a/crypto/merkle/simple_map.go b/crypto/merkle/simple_map.go
index bde442203..36434f67f 100644
--- a/crypto/merkle/simple_map.go
+++ b/crypto/merkle/simple_map.go
@@ -5,14 +5,14 @@ import (
 
 	amino "github.com/tendermint/go-amino"
 	"github.com/tendermint/tendermint/crypto/tmhash"
-	cmn "github.com/tendermint/tendermint/libs/common"
+	"github.com/tendermint/tendermint/libs/kv"
 )
 
 // Merkle tree from a map.
 // Leaves are `hash(key) | hash(value)`.
 // Leaves are sorted before Merkle hashing.
 type simpleMap struct {
-	kvs    cmn.KVPairs
+	kvs    kv.Pairs
 	sorted bool
 }
 
@@ -33,7 +33,7 @@ func (sm *simpleMap) Set(key string, value []byte) {
 	// and make a determination to fetch or not.
 	vhash := tmhash.Sum(value)
 
-	sm.kvs = append(sm.kvs, cmn.KVPair{
+	sm.kvs = append(sm.kvs, kv.Pair{
 		Key:   []byte(key),
 		Value: vhash,
 	})
@@ -56,9 +56,9 @@ func (sm *simpleMap) Sort() {
 
 // Returns a copy of sorted KVPairs.
 // NOTE these contain the hashed key and value.
-func (sm *simpleMap) KVPairs() cmn.KVPairs {
+func (sm *simpleMap) KVPairs() kv.Pairs {
 	sm.Sort()
-	kvs := make(cmn.KVPairs, len(sm.kvs))
+	kvs := make(kv.Pairs, len(sm.kvs))
 	copy(kvs, sm.kvs)
 	return kvs
 }
@@ -68,7 +68,7 @@ func (sm *simpleMap) KVPairs() cmn.KVPairs {
 // A local extension to KVPair that can be hashed.
 // Key and value are length prefixed and concatenated,
 // then hashed.
-type KVPair cmn.KVPair
+type KVPair kv.Pair
 
 // Bytes returns key || value, with both the
 // key and value length prefixed.
@@ -85,7 +85,7 @@ func (kv KVPair) Bytes() []byte {
 	return b.Bytes()
 }
 
-func hashKVPairs(kvs cmn.KVPairs) []byte {
+func hashKVPairs(kvs kv.Pairs) []byte {
 	kvsH := make([][]byte, len(kvs))
 	for i, kvp := range kvs {
 		kvsH[i] = KVPair(kvp).Bytes()
diff --git a/docs/app-dev/app-development.md b/docs/app-dev/app-development.md
index 74c2eafad..44a2ea623 100644
--- a/docs/app-dev/app-development.md
+++ b/docs/app-dev/app-development.md
@@ -187,7 +187,7 @@ func (app *KVStoreApplication) DeliverTx(req types.RequestDeliverTx) types.Respo
 	events := []types.Event{
 		{
 			Type: "app",
-			Attributes: []cmn.KVPair{
+			Attributes: []kv.Pair{
 				{Key: []byte("creator"), Value: []byte("Cosmoshi Netowoko")},
 				{Key: []byte("key"), Value: key},
 			},
diff --git a/docs/app-dev/indexing-transactions.md b/docs/app-dev/indexing-transactions.md
index 31ff737e1..b3a4789b0 100644
--- a/docs/app-dev/indexing-transactions.md
+++ b/docs/app-dev/indexing-transactions.md
@@ -76,10 +76,10 @@ func (app *KVStoreApplication) DeliverTx(req types.RequestDeliverTx) types.Resul
     events := []abci.Event{
         {
             Type: "transfer",
-            Attributes: cmn.KVPairs{
-                cmn.KVPair{Key: []byte("sender"), Value: []byte("Bob")},
-                cmn.KVPair{Key: []byte("recipient"), Value: []byte("Alice")},
-                cmn.KVPair{Key: []byte("balance"), Value: []byte("100")},
+            Attributes: kv.Pairs{
+                kv.Pair{Key: []byte("sender"), Value: []byte("Bob")},
+                kv.Pair{Key: []byte("recipient"), Value: []byte("Alice")},
+                kv.Pair{Key: []byte("balance"), Value: []byte("100")},
             },
         },
     }
diff --git a/docs/architecture/adr-037-deliver-block.md b/docs/architecture/adr-037-deliver-block.md
index 31907c9ae..c5e119c06 100644
--- a/docs/architecture/adr-037-deliver-block.md
+++ b/docs/architecture/adr-037-deliver-block.md
@@ -70,7 +70,7 @@ type RequestDeliverBlock struct {
 type ResponseDeliverBlock struct {
     ValidatorUpdates      []ValidatorUpdate
     ConsensusParamUpdates *ConsensusParams
-    Tags                  []common.KVPair
+    Tags                  []kv.Pair
     TxResults             []ResponseDeliverTx
 }
 
diff --git a/libs/common/int_test.go b/libs/common/int_test.go
deleted file mode 100644
index 1ecc7844c..000000000
--- a/libs/common/int_test.go
+++ /dev/null
@@ -1,14 +0,0 @@
-package common
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestIntInSlice(t *testing.T) {
-	assert.True(t, IntInSlice(1, []int{1, 2, 3}))
-	assert.False(t, IntInSlice(4, []int{1, 2, 3}))
-	assert.True(t, IntInSlice(0, []int{0}))
-	assert.False(t, IntInSlice(0, []int{}))
-}
diff --git a/libs/common/kvpair.go b/libs/kv/kvpair.go
similarity index 78%
rename from libs/common/kvpair.go
rename to libs/kv/kvpair.go
index 54c3a58c0..3007c0272 100644
--- a/libs/common/kvpair.go
+++ b/libs/kv/kvpair.go
@@ -1,4 +1,4 @@
-package common
+package kv
 
 import (
 	"bytes"
@@ -11,17 +11,17 @@ import (
 /*
 Defined in types.proto
 
-type KVPair struct {
+type Pair struct {
 	Key   []byte
 	Value []byte
 }
 */
 
-type KVPairs []KVPair
+type Pairs []Pair
 
 // Sorting
-func (kvs KVPairs) Len() int { return len(kvs) }
-func (kvs KVPairs) Less(i, j int) bool {
+func (kvs Pairs) Len() int { return len(kvs) }
+func (kvs Pairs) Less(i, j int) bool {
 	switch bytes.Compare(kvs[i].Key, kvs[j].Key) {
 	case -1:
 		return true
@@ -33,8 +33,8 @@ func (kvs KVPairs) Less(i, j int) bool {
 		panic("invalid comparison result")
 	}
 }
-func (kvs KVPairs) Swap(i, j int) { kvs[i], kvs[j] = kvs[j], kvs[i] }
-func (kvs KVPairs) Sort()         { sort.Sort(kvs) }
+func (kvs Pairs) Swap(i, j int) { kvs[i], kvs[j] = kvs[j], kvs[i] }
+func (kvs Pairs) Sort()         { sort.Sort(kvs) }
 
 //----------------------------------------
 // KI64Pair
diff --git a/libs/common/result.go b/libs/kv/result.go
similarity index 88%
rename from libs/common/result.go
rename to libs/kv/result.go
index 90d149f4b..b2d855cbc 100644
--- a/libs/common/result.go
+++ b/libs/kv/result.go
@@ -1,6 +1,6 @@
 // nolint: dupl
 // dupl is reading this as the same file as crypto/merkle/result.go
-package common
+package kv
 
 import (
 	"bytes"
@@ -20,12 +20,12 @@ var (
 	jsonpbUnmarshaller = jsonpb.Unmarshaler{}
 )
 
-func (r *KVPair) MarshalJSON() ([]byte, error) {
+func (r *Pair) MarshalJSON() ([]byte, error) {
 	s, err := jsonpbMarshaller.MarshalToString(r)
 	return []byte(s), err
 }
 
-func (r *KVPair) UnmarshalJSON(b []byte) error {
+func (r *Pair) UnmarshalJSON(b []byte) error {
 	reader := bytes.NewBuffer(b)
 	return jsonpbUnmarshaller.Unmarshal(reader, r)
 }
@@ -50,5 +50,5 @@ type jsonRoundTripper interface {
 	json.Unmarshaler
 }
 
-var _ jsonRoundTripper = (*KVPair)(nil)
+var _ jsonRoundTripper = (*Pair)(nil)
 var _ jsonRoundTripper = (*KI64Pair)(nil)
diff --git a/libs/common/types.pb.go b/libs/kv/types.pb.go
similarity index 78%
rename from libs/common/types.pb.go
rename to libs/kv/types.pb.go
index 149f14556..6354c77a5 100644
--- a/libs/common/types.pb.go
+++ b/libs/kv/types.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-gogo. DO NOT EDIT.
-// source: libs/common/types.proto
+// source: libs/kv/types.proto
 
-package common
+package kv
 
 import (
 	bytes "bytes"
@@ -27,7 +27,7 @@ var _ = math.Inf
 const _ = proto.GoGoProtoPackageIsVersion3 // please upgrade the proto package
 
 // Define these here for compatibility but use tmlibs/common.KVPair.
-type KVPair struct {
+type Pair struct {
 	Key                  []byte   `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
 	Value                []byte   `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
@@ -35,18 +35,18 @@ type KVPair struct {
 	XXX_sizecache        int32    `json:"-"`
 }
 
-func (m *KVPair) Reset()         { *m = KVPair{} }
-func (m *KVPair) String() string { return proto.CompactTextString(m) }
-func (*KVPair) ProtoMessage()    {}
-func (*KVPair) Descriptor() ([]byte, []int) {
-	return fileDescriptor_28b36ea5054b507d, []int{0}
+func (m *Pair) Reset()         { *m = Pair{} }
+func (m *Pair) String() string { return proto.CompactTextString(m) }
+func (*Pair) ProtoMessage()    {}
+func (*Pair) Descriptor() ([]byte, []int) {
+	return fileDescriptor_31432671d164f444, []int{0}
 }
-func (m *KVPair) XXX_Unmarshal(b []byte) error {
+func (m *Pair) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
 }
-func (m *KVPair) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+func (m *Pair) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
 	if deterministic {
-		return xxx_messageInfo_KVPair.Marshal(b, m, deterministic)
+		return xxx_messageInfo_Pair.Marshal(b, m, deterministic)
 	} else {
 		b = b[:cap(b)]
 		n, err := m.MarshalToSizedBuffer(b)
@@ -56,26 +56,26 @@ func (m *KVPair) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
 		return b[:n], nil
 	}
 }
-func (m *KVPair) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_KVPair.Merge(m, src)
+func (m *Pair) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Pair.Merge(m, src)
 }
-func (m *KVPair) XXX_Size() int {
+func (m *Pair) XXX_Size() int {
 	return m.Size()
 }
-func (m *KVPair) XXX_DiscardUnknown() {
-	xxx_messageInfo_KVPair.DiscardUnknown(m)
+func (m *Pair) XXX_DiscardUnknown() {
+	xxx_messageInfo_Pair.DiscardUnknown(m)
 }
 
-var xxx_messageInfo_KVPair proto.InternalMessageInfo
+var xxx_messageInfo_Pair proto.InternalMessageInfo
 
-func (m *KVPair) GetKey() []byte {
+func (m *Pair) GetKey() []byte {
 	if m != nil {
 		return m.Key
 	}
 	return nil
 }
 
-func (m *KVPair) GetValue() []byte {
+func (m *Pair) GetValue() []byte {
 	if m != nil {
 		return m.Value
 	}
@@ -95,7 +95,7 @@ func (m *KI64Pair) Reset()         { *m = KI64Pair{} }
 func (m *KI64Pair) String() string { return proto.CompactTextString(m) }
 func (*KI64Pair) ProtoMessage()    {}
 func (*KI64Pair) Descriptor() ([]byte, []int) {
-	return fileDescriptor_28b36ea5054b507d, []int{1}
+	return fileDescriptor_31432671d164f444, []int{1}
 }
 func (m *KI64Pair) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -139,40 +139,40 @@ func (m *KI64Pair) GetValue() int64 {
 }
 
 func init() {
-	proto.RegisterType((*KVPair)(nil), "tendermint.libs.common.KVPair")
-	golang_proto.RegisterType((*KVPair)(nil), "tendermint.libs.common.KVPair")
-	proto.RegisterType((*KI64Pair)(nil), "tendermint.libs.common.KI64Pair")
-	golang_proto.RegisterType((*KI64Pair)(nil), "tendermint.libs.common.KI64Pair")
-}
-
-func init() { proto.RegisterFile("libs/common/types.proto", fileDescriptor_28b36ea5054b507d) }
-func init() { golang_proto.RegisterFile("libs/common/types.proto", fileDescriptor_28b36ea5054b507d) }
-
-var fileDescriptor_28b36ea5054b507d = []byte{
-	// 197 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x12, 0xcf, 0xc9, 0x4c, 0x2a,
-	0xd6, 0x4f, 0xce, 0xcf, 0xcd, 0xcd, 0xcf, 0xd3, 0x2f, 0xa9, 0x2c, 0x48, 0x2d, 0xd6, 0x2b, 0x28,
-	0xca, 0x2f, 0xc9, 0x17, 0x12, 0x2b, 0x49, 0xcd, 0x4b, 0x49, 0x2d, 0xca, 0xcd, 0xcc, 0x2b, 0xd1,
-	0x03, 0xa9, 0xd1, 0x83, 0xa8, 0x91, 0xd2, 0x4d, 0xcf, 0x2c, 0xc9, 0x28, 0x4d, 0x02, 0x71, 0xf5,
-	0xd3, 0xf3, 0xd3, 0xf3, 0xf5, 0xc1, 0xca, 0x93, 0x4a, 0xd3, 0xc0, 0x3c, 0x30, 0x07, 0xcc, 0x82,
-	0x18, 0xa3, 0x64, 0xc0, 0xc5, 0xe6, 0x1d, 0x16, 0x90, 0x98, 0x59, 0x24, 0x24, 0xc0, 0xc5, 0x9c,
-	0x9d, 0x5a, 0x29, 0xc1, 0xa8, 0xc0, 0xa8, 0xc1, 0x13, 0x04, 0x62, 0x0a, 0x89, 0x70, 0xb1, 0x96,
-	0x25, 0xe6, 0x94, 0xa6, 0x4a, 0x30, 0x81, 0xc5, 0x20, 0x1c, 0x25, 0x23, 0x2e, 0x0e, 0x6f, 0x4f,
-	0x33, 0x13, 0x62, 0xf4, 0x30, 0x43, 0xf5, 0x38, 0x79, 0xfd, 0x78, 0x28, 0xc7, 0xb8, 0xe2, 0x91,
-	0x1c, 0xe3, 0x8e, 0x47, 0x72, 0x8c, 0x27, 0x1e, 0xc9, 0x31, 0x5e, 0x78, 0x24, 0xc7, 0xf8, 0xe0,
-	0x91, 0x1c, 0xe3, 0x81, 0xc7, 0x72, 0x8c, 0x51, 0x3a, 0x48, 0x4e, 0x46, 0xf8, 0x0a, 0x99, 0x89,
-	0x14, 0x08, 0x49, 0x6c, 0x60, 0x87, 0x1b, 0x03, 0x02, 0x00, 0x00, 0xff, 0xff, 0xd4, 0xc3, 0x96,
-	0x94, 0x1a, 0x01, 0x00, 0x00,
-}
-
-func (this *KVPair) Equal(that interface{}) bool {
+	proto.RegisterType((*Pair)(nil), "tendermint.libs.kv.Pair")
+	golang_proto.RegisterType((*Pair)(nil), "tendermint.libs.kv.Pair")
+	proto.RegisterType((*KI64Pair)(nil), "tendermint.libs.kv.KI64Pair")
+	golang_proto.RegisterType((*KI64Pair)(nil), "tendermint.libs.kv.KI64Pair")
+}
+
+func init() { proto.RegisterFile("libs/kv/types.proto", fileDescriptor_31432671d164f444) }
+func init() { golang_proto.RegisterFile("libs/kv/types.proto", fileDescriptor_31432671d164f444) }
+
+var fileDescriptor_31432671d164f444 = []byte{
+	// 193 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x12, 0xce, 0xc9, 0x4c, 0x2a,
+	0xd6, 0xcf, 0x2e, 0xd3, 0x2f, 0xa9, 0x2c, 0x48, 0x2d, 0xd6, 0x2b, 0x28, 0xca, 0x2f, 0xc9, 0x17,
+	0x12, 0x2a, 0x49, 0xcd, 0x4b, 0x49, 0x2d, 0xca, 0xcd, 0xcc, 0x2b, 0xd1, 0x03, 0xc9, 0xeb, 0x65,
+	0x97, 0x49, 0xe9, 0xa6, 0x67, 0x96, 0x64, 0x94, 0x26, 0xe9, 0x25, 0xe7, 0xe7, 0xea, 0xa7, 0xe7,
+	0xa7, 0xe7, 0xeb, 0x83, 0x95, 0x26, 0x95, 0xa6, 0x81, 0x79, 0x60, 0x0e, 0x98, 0x05, 0x31, 0x42,
+	0x49, 0x8f, 0x8b, 0x25, 0x20, 0x31, 0xb3, 0x48, 0x48, 0x80, 0x8b, 0x39, 0x3b, 0xb5, 0x52, 0x82,
+	0x51, 0x81, 0x51, 0x83, 0x27, 0x08, 0xc4, 0x14, 0x12, 0xe1, 0x62, 0x2d, 0x4b, 0xcc, 0x29, 0x4d,
+	0x95, 0x60, 0x02, 0x8b, 0x41, 0x38, 0x4a, 0x46, 0x5c, 0x1c, 0xde, 0x9e, 0x66, 0x26, 0xc4, 0xe8,
+	0x61, 0x86, 0xea, 0x71, 0x72, 0xfb, 0xf1, 0x50, 0x8e, 0x71, 0xc5, 0x23, 0x39, 0xc6, 0x1d, 0x8f,
+	0xe4, 0x18, 0x4f, 0x3c, 0x92, 0x63, 0xbc, 0xf0, 0x48, 0x8e, 0xf1, 0xc1, 0x23, 0x39, 0xc6, 0x03,
+	0x8f, 0xe5, 0x18, 0xa3, 0x34, 0x90, 0x1c, 0x8c, 0xf0, 0x0f, 0x32, 0x13, 0xea, 0xf5, 0x24, 0x36,
+	0xb0, 0x93, 0x8d, 0x01, 0x01, 0x00, 0x00, 0xff, 0xff, 0x01, 0x3f, 0x5a, 0xca, 0x0c, 0x01, 0x00,
+	0x00,
+}
+
+func (this *Pair) Equal(that interface{}) bool {
 	if that == nil {
 		return this == nil
 	}
 
-	that1, ok := that.(*KVPair)
+	that1, ok := that.(*Pair)
 	if !ok {
-		that2, ok := that.(KVPair)
+		that2, ok := that.(Pair)
 		if ok {
 			that1 = &that2
 		} else {
@@ -225,7 +225,7 @@ func (this *KI64Pair) Equal(that interface{}) bool {
 	}
 	return true
 }
-func (m *KVPair) Marshal() (dAtA []byte, err error) {
+func (m *Pair) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
 	n, err := m.MarshalToSizedBuffer(dAtA[:size])
@@ -235,12 +235,12 @@ func (m *KVPair) Marshal() (dAtA []byte, err error) {
 	return dAtA[:n], nil
 }
 
-func (m *KVPair) MarshalTo(dAtA []byte) (int, error) {
+func (m *Pair) MarshalTo(dAtA []byte) (int, error) {
 	size := m.Size()
 	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
-func (m *KVPair) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+func (m *Pair) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	i := len(dAtA)
 	_ = i
 	var l int
@@ -316,8 +316,8 @@ func encodeVarintTypes(dAtA []byte, offset int, v uint64) int {
 	dAtA[offset] = uint8(v)
 	return base
 }
-func NewPopulatedKVPair(r randyTypes, easy bool) *KVPair {
-	this := &KVPair{}
+func NewPopulatedPair(r randyTypes, easy bool) *Pair {
+	this := &Pair{}
 	v1 := r.Intn(100)
 	this.Key = make([]byte, v1)
 	for i := 0; i < v1; i++ {
@@ -423,7 +423,7 @@ func encodeVarintPopulateTypes(dAtA []byte, v uint64) []byte {
 	dAtA = append(dAtA, uint8(v))
 	return dAtA
 }
-func (m *KVPair) Size() (n int) {
+func (m *Pair) Size() (n int) {
 	if m == nil {
 		return 0
 	}
@@ -468,7 +468,7 @@ func sovTypes(x uint64) (n int) {
 func sozTypes(x uint64) (n int) {
 	return sovTypes(uint64((x << 1) ^ uint64((int64(x) >> 63))))
 }
-func (m *KVPair) Unmarshal(dAtA []byte) error {
+func (m *Pair) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
 	for iNdEx < l {
@@ -491,10 +491,10 @@ func (m *KVPair) Unmarshal(dAtA []byte) error {
 		fieldNum := int32(wire >> 3)
 		wireType := int(wire & 0x7)
 		if wireType == 4 {
-			return fmt.Errorf("proto: KVPair: wiretype end group for non-group")
+			return fmt.Errorf("proto: Pair: wiretype end group for non-group")
 		}
 		if fieldNum <= 0 {
-			return fmt.Errorf("proto: KVPair: illegal tag %d (wire type %d)", fieldNum, wire)
+			return fmt.Errorf("proto: Pair: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
 		case 1:
@@ -700,6 +700,7 @@ func (m *KI64Pair) Unmarshal(dAtA []byte) error {
 func skipTypes(dAtA []byte) (n int, err error) {
 	l := len(dAtA)
 	iNdEx := 0
+	depth := 0
 	for iNdEx < l {
 		var wire uint64
 		for shift := uint(0); ; shift += 7 {
@@ -731,10 +732,8 @@ func skipTypes(dAtA []byte) (n int, err error) {
 					break
 				}
 			}
-			return iNdEx, nil
 		case 1:
 			iNdEx += 8
-			return iNdEx, nil
 		case 2:
 			var length int
 			for shift := uint(0); ; shift += 7 {
@@ -755,55 +754,30 @@ func skipTypes(dAtA []byte) (n int, err error) {
 				return 0, ErrInvalidLengthTypes
 			}
 			iNdEx += length
-			if iNdEx < 0 {
-				return 0, ErrInvalidLengthTypes
-			}
-			return iNdEx, nil
 		case 3:
-			for {
-				var innerWire uint64
-				var start int = iNdEx
-				for shift := uint(0); ; shift += 7 {
-					if shift >= 64 {
-						return 0, ErrIntOverflowTypes
-					}
-					if iNdEx >= l {
-						return 0, io.ErrUnexpectedEOF
-					}
-					b := dAtA[iNdEx]
-					iNdEx++
-					innerWire |= (uint64(b) & 0x7F) << shift
-					if b < 0x80 {
-						break
-					}
-				}
-				innerWireType := int(innerWire & 0x7)
-				if innerWireType == 4 {
-					break
-				}
-				next, err := skipTypes(dAtA[start:])
-				if err != nil {
-					return 0, err
-				}
-				iNdEx = start + next
-				if iNdEx < 0 {
-					return 0, ErrInvalidLengthTypes
-				}
-			}
-			return iNdEx, nil
+			depth++
 		case 4:
-			return iNdEx, nil
+			if depth == 0 {
+				return 0, ErrUnexpectedEndOfGroupTypes
+			}
+			depth--
 		case 5:
 			iNdEx += 4
-			return iNdEx, nil
 		default:
 			return 0, fmt.Errorf("proto: illegal wireType %d", wireType)
 		}
+		if iNdEx < 0 {
+			return 0, ErrInvalidLengthTypes
+		}
+		if depth == 0 {
+			return iNdEx, nil
+		}
 	}
-	panic("unreachable")
+	return 0, io.ErrUnexpectedEOF
 }
 
 var (
-	ErrInvalidLengthTypes = fmt.Errorf("proto: negative length found during unmarshaling")
-	ErrIntOverflowTypes   = fmt.Errorf("proto: integer overflow")
+	ErrInvalidLengthTypes        = fmt.Errorf("proto: negative length found during unmarshaling")
+	ErrIntOverflowTypes          = fmt.Errorf("proto: integer overflow")
+	ErrUnexpectedEndOfGroupTypes = fmt.Errorf("proto: unexpected end of group")
 )
diff --git a/libs/common/types.proto b/libs/kv/types.proto
similarity index 85%
rename from libs/common/types.proto
rename to libs/kv/types.proto
index 7a43c277b..59940c8d0 100644
--- a/libs/common/types.proto
+++ b/libs/kv/types.proto
@@ -1,6 +1,6 @@
 syntax = "proto3";
-package tendermint.libs.common;
-option go_package = "github.com/tendermint/tendermint/libs/common";
+package tendermint.libs.kv;
+option go_package = "github.com/tendermint/tendermint/libs/kv";
 
 import "github.com/gogo/protobuf/gogoproto/gogo.proto";
 
@@ -17,7 +17,7 @@ option (gogoproto.testgen_all) = true;
 // Abstract types
 
 // Define these here for compatibility but use tmlibs/common.KVPair.
-message KVPair {
+message Pair {
   bytes key = 1;
   bytes value = 2;
 }
diff --git a/libs/common/typespb_test.go b/libs/kv/typespb_test.go
similarity index 92%
rename from libs/common/typespb_test.go
rename to libs/kv/typespb_test.go
index a4b96a389..38656ecf9 100644
--- a/libs/common/typespb_test.go
+++ b/libs/kv/typespb_test.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-gogo. DO NOT EDIT.
-// source: libs/common/types.proto
+// source: libs/kv/types.proto
 
-package common
+package kv
 
 import (
 	fmt "fmt"
@@ -22,15 +22,15 @@ var _ = golang_proto.Marshal
 var _ = fmt.Errorf
 var _ = math.Inf
 
-func TestKVPairProto(t *testing.T) {
+func TestPairProto(t *testing.T) {
 	seed := time.Now().UnixNano()
 	popr := math_rand.New(math_rand.NewSource(seed))
-	p := NewPopulatedKVPair(popr, false)
+	p := NewPopulatedPair(popr, false)
 	dAtA, err := github_com_gogo_protobuf_proto.Marshal(p)
 	if err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
 	}
-	msg := &KVPair{}
+	msg := &Pair{}
 	if err := github_com_gogo_protobuf_proto.Unmarshal(dAtA, msg); err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
 	}
@@ -53,10 +53,10 @@ func TestKVPairProto(t *testing.T) {
 	}
 }
 
-func TestKVPairMarshalTo(t *testing.T) {
+func TestPairMarshalTo(t *testing.T) {
 	seed := time.Now().UnixNano()
 	popr := math_rand.New(math_rand.NewSource(seed))
-	p := NewPopulatedKVPair(popr, false)
+	p := NewPopulatedPair(popr, false)
 	size := p.Size()
 	dAtA := make([]byte, size)
 	for i := range dAtA {
@@ -66,7 +66,7 @@ func TestKVPairMarshalTo(t *testing.T) {
 	if err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
 	}
-	msg := &KVPair{}
+	msg := &Pair{}
 	if err := github_com_gogo_protobuf_proto.Unmarshal(dAtA, msg); err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
 	}
@@ -134,16 +134,16 @@ func TestKI64PairMarshalTo(t *testing.T) {
 	}
 }
 
-func TestKVPairJSON(t *testing.T) {
+func TestPairJSON(t *testing.T) {
 	seed := time.Now().UnixNano()
 	popr := math_rand.New(math_rand.NewSource(seed))
-	p := NewPopulatedKVPair(popr, true)
+	p := NewPopulatedPair(popr, true)
 	marshaler := github_com_gogo_protobuf_jsonpb.Marshaler{}
 	jsondata, err := marshaler.MarshalToString(p)
 	if err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
 	}
-	msg := &KVPair{}
+	msg := &Pair{}
 	err = github_com_gogo_protobuf_jsonpb.UnmarshalString(jsondata, msg)
 	if err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
@@ -170,12 +170,12 @@ func TestKI64PairJSON(t *testing.T) {
 		t.Fatalf("seed = %d, %#v !Json Equal %#v", seed, msg, p)
 	}
 }
-func TestKVPairProtoText(t *testing.T) {
+func TestPairProtoText(t *testing.T) {
 	seed := time.Now().UnixNano()
 	popr := math_rand.New(math_rand.NewSource(seed))
-	p := NewPopulatedKVPair(popr, true)
+	p := NewPopulatedPair(popr, true)
 	dAtA := github_com_gogo_protobuf_proto.MarshalTextString(p)
-	msg := &KVPair{}
+	msg := &Pair{}
 	if err := github_com_gogo_protobuf_proto.UnmarshalText(dAtA, msg); err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
 	}
@@ -184,12 +184,12 @@ func TestKVPairProtoText(t *testing.T) {
 	}
 }
 
-func TestKVPairProtoCompactText(t *testing.T) {
+func TestPairProtoCompactText(t *testing.T) {
 	seed := time.Now().UnixNano()
 	popr := math_rand.New(math_rand.NewSource(seed))
-	p := NewPopulatedKVPair(popr, true)
+	p := NewPopulatedPair(popr, true)
 	dAtA := github_com_gogo_protobuf_proto.CompactTextString(p)
-	msg := &KVPair{}
+	msg := &Pair{}
 	if err := github_com_gogo_protobuf_proto.UnmarshalText(dAtA, msg); err != nil {
 		t.Fatalf("seed = %d, err = %v", seed, err)
 	}
@@ -226,10 +226,10 @@ func TestKI64PairProtoCompactText(t *testing.T) {
 	}
 }
 
-func TestKVPairSize(t *testing.T) {
+func TestPairSize(t *testing.T) {
 	seed := time.Now().UnixNano()
 	popr := math_rand.New(math_rand.NewSource(seed))
-	p := NewPopulatedKVPair(popr, true)
+	p := NewPopulatedPair(popr, true)
 	size2 := github_com_gogo_protobuf_proto.Size(p)
 	dAtA, err := github_com_gogo_protobuf_proto.Marshal(p)
 	if err != nil {
diff --git a/rpc/swagger/swagger.yaml b/rpc/swagger/swagger.yaml
index d6e66dbe5..f2a40250a 100644
--- a/rpc/swagger/swagger.yaml
+++ b/rpc/swagger/swagger.yaml
@@ -187,28 +187,28 @@ paths:
           Events: []abci.Event{
               {
                   Type: "rewards.withdraw",
-                  Attributes: cmn.KVPairs{
-                      cmn.KVPair{Key: []byte("address"), Value: []byte("AddrA")},
-                      cmn.KVPair{Key: []byte("source"), Value: []byte("SrcX")},
-                      cmn.KVPair{Key: []byte("amount"), Value: []byte("...")},
-                      cmn.KVPair{Key: []byte("balance"), Value: []byte("...")},
+                  Attributes: kv.Pairs{
+                      kv.Pair{Key: []byte("address"), Value: []byte("AddrA")},
+                      kv.Pair{Key: []byte("source"), Value: []byte("SrcX")},
+                      kv.Pair{Key: []byte("amount"), Value: []byte("...")},
+                      kv.Pair{Key: []byte("balance"), Value: []byte("...")},
                   },
               },
               {
                   Type: "rewards.withdraw",
-                  Attributes: cmn.KVPairs{
-                      cmn.KVPair{Key: []byte("address"), Value: []byte("AddrB")},
-                      cmn.KVPair{Key: []byte("source"), Value: []byte("SrcY")},
-                      cmn.KVPair{Key: []byte("amount"), Value: []byte("...")},
-                      cmn.KVPair{Key: []byte("balance"), Value: []byte("...")},
+                  Attributes: kv.Pairs{
+                      kv.Pair{Key: []byte("address"), Value: []byte("AddrB")},
+                      kv.Pair{Key: []byte("source"), Value: []byte("SrcY")},
+                      kv.Pair{Key: []byte("amount"), Value: []byte("...")},
+                      kv.Pair{Key: []byte("balance"), Value: []byte("...")},
                   },
               },
               {
                   Type: "transfer",
-                  Attributes: cmn.KVPairs{
-                      cmn.KVPair{Key: []byte("sender"), Value: []byte("AddrC")},
-                      cmn.KVPair{Key: []byte("recipient"), Value: []byte("AddrD")},
-                      cmn.KVPair{Key: []byte("amount"), Value: []byte("...")},
+                  Attributes: kv.Pairs{
+                      kv.Pair{Key: []byte("sender"), Value: []byte("AddrC")},
+                      kv.Pair{Key: []byte("recipient"), Value: []byte("AddrD")},
+                      kv.Pair{Key: []byte("amount"), Value: []byte("...")},
                   },
               },
           },
diff --git a/state/state_test.go b/state/state_test.go
index 0d9cd07a0..a407f49ad 100644
--- a/state/state_test.go
+++ b/state/state_test.go
@@ -13,6 +13,7 @@ import (
 	abci "github.com/tendermint/tendermint/abci/types"
 	"github.com/tendermint/tendermint/crypto/ed25519"
 	cmn "github.com/tendermint/tendermint/libs/common"
+	"github.com/tendermint/tendermint/libs/kv"
 	sm "github.com/tendermint/tendermint/state"
 	dbm "github.com/tendermint/tm-db"
 
@@ -132,8 +133,8 @@ func TestABCIResponsesSaveLoad2(t *testing.T) {
 				{
 					Data: []byte("Gotcha!"),
 					Events: []abci.Event{
-						{Type: "type1", Attributes: []cmn.KVPair{{Key: []byte("a"), Value: []byte("1")}}},
-						{Type: "type2", Attributes: []cmn.KVPair{{Key: []byte("build"), Value: []byte("stuff")}}},
+						{Type: "type1", Attributes: []kv.Pair{{Key: []byte("a"), Value: []byte("1")}}},
+						{Type: "type2", Attributes: []kv.Pair{{Key: []byte("build"), Value: []byte("stuff")}}},
 					},
 				},
 			},
diff --git a/state/txindex/kv/kv.go b/state/txindex/kv/kv.go
index 0a56df22d..46365dafb 100644
--- a/state/txindex/kv/kv.go
+++ b/state/txindex/kv/kv.go
@@ -220,7 +220,7 @@ func (txi *TxIndex) Search(q *query.Query) ([]*types.TxResult, error) {
 
 	// for all other conditions
 	for i, c := range conditions {
-		if cmn.IntInSlice(i, skipIndexes) {
+		if intInSlice(i, skipIndexes) {
 			continue
 		}
 
diff --git a/state/txindex/kv/kv_bench_test.go b/state/txindex/kv/kv_bench_test.go
index 834cf52e7..3e3bdced3 100644
--- a/state/txindex/kv/kv_bench_test.go
+++ b/state/txindex/kv/kv_bench_test.go
@@ -7,7 +7,7 @@ import (
 	"testing"
 
 	abci "github.com/tendermint/tendermint/abci/types"
-	cmn "github.com/tendermint/tendermint/libs/common"
+	"github.com/tendermint/tendermint/libs/kv"
 	"github.com/tendermint/tendermint/libs/pubsub/query"
 	"github.com/tendermint/tendermint/types"
 	dbm "github.com/tendermint/tm-db"
@@ -31,7 +31,7 @@ func BenchmarkTxSearch(b *testing.B) {
 		events := []abci.Event{
 			{
 				Type: "transfer",
-				Attributes: []cmn.KVPair{
+				Attributes: []kv.Pair{
 					{Key: []byte("address"), Value: []byte(fmt.Sprintf("address_%d", i%100))},
 					{Key: []byte("amount"), Value: []byte("50")},
 				},
diff --git a/state/txindex/kv/kv_test.go b/state/txindex/kv/kv_test.go
index 4da251062..ecdac7260 100644
--- a/state/txindex/kv/kv_test.go
+++ b/state/txindex/kv/kv_test.go
@@ -13,6 +13,7 @@ import (
 
 	abci "github.com/tendermint/tendermint/abci/types"
 	cmn "github.com/tendermint/tendermint/libs/common"
+	"github.com/tendermint/tendermint/libs/kv"
 	"github.com/tendermint/tendermint/libs/pubsub/query"
 	"github.com/tendermint/tendermint/state/txindex"
 	"github.com/tendermint/tendermint/types"
@@ -69,9 +70,9 @@ func TestTxSearch(t *testing.T) {
 	indexer := NewTxIndex(db.NewMemDB(), IndexEvents(allowedKeys))
 
 	txResult := txResultWithEvents([]abci.Event{
-		{Type: "account", Attributes: []cmn.KVPair{{Key: []byte("number"), Value: []byte("1")}}},
-		{Type: "account", Attributes: []cmn.KVPair{{Key: []byte("owner"), Value: []byte("Ivan")}}},
-		{Type: "", Attributes: []cmn.KVPair{{Key: []byte("not_allowed"), Value: []byte("Vlad")}}},
+		{Type: "account", Attributes: []kv.Pair{{Key: []byte("number"), Value: []byte("1")}}},
+		{Type: "account", Attributes: []kv.Pair{{Key: []byte("owner"), Value: []byte("Ivan")}}},
+		{Type: "", Attributes: []kv.Pair{{Key: []byte("not_allowed"), Value: []byte("Vlad")}}},
 	})
 	hash := txResult.Tx.Hash()
 
@@ -137,7 +138,7 @@ func TestTxSearchDeprecatedIndexing(t *testing.T) {
 
 	// index tx using events indexing (composite key)
 	txResult1 := txResultWithEvents([]abci.Event{
-		{Type: "account", Attributes: []cmn.KVPair{{Key: []byte("number"), Value: []byte("1")}}},
+		{Type: "account", Attributes: []kv.Pair{{Key: []byte("number"), Value: []byte("1")}}},
 	})
 	hash1 := txResult1.Tx.Hash()
 
@@ -206,8 +207,8 @@ func TestTxSearchOneTxWithMultipleSameTagsButDifferentValues(t *testing.T) {
 	indexer := NewTxIndex(db.NewMemDB(), IndexEvents(allowedKeys))
 
 	txResult := txResultWithEvents([]abci.Event{
-		{Type: "account", Attributes: []cmn.KVPair{{Key: []byte("number"), Value: []byte("1")}}},
-		{Type: "account", Attributes: []cmn.KVPair{{Key: []byte("number"), Value: []byte("2")}}},
+		{Type: "account", Attributes: []kv.Pair{{Key: []byte("number"), Value: []byte("1")}}},
+		{Type: "account", Attributes: []kv.Pair{{Key: []byte("number"), Value: []byte("2")}}},
 	})
 
 	err := indexer.Index(txResult)
@@ -226,7 +227,7 @@ func TestTxSearchMultipleTxs(t *testing.T) {
 
 	// indexed first, but bigger height (to test the order of transactions)
 	txResult := txResultWithEvents([]abci.Event{
-		{Type: "account", Attributes: []cmn.KVPair{{Key: []byte("number"), Value: []byte("1")}}},
+		{Type: "account", Attributes: []kv.Pair{{Key: []byte("number"), Value: []byte("1")}}},
 	})
 
 	txResult.Tx = types.Tx("Bob's account")
@@ -237,7 +238,7 @@ func TestTxSearchMultipleTxs(t *testing.T) {
 
 	// indexed second, but smaller height (to test the order of transactions)
 	txResult2 := txResultWithEvents([]abci.Event{
-		{Type: "account", Attributes: []cmn.KVPair{{Key: []byte("number"), Value: []byte("2")}}},
+		{Type: "account", Attributes: []kv.Pair{{Key: []byte("number"), Value: []byte("2")}}},
 	})
 	txResult2.Tx = types.Tx("Alice's account")
 	txResult2.Height = 1
@@ -248,7 +249,7 @@ func TestTxSearchMultipleTxs(t *testing.T) {
 
 	// indexed third (to test the order of transactions)
 	txResult3 := txResultWithEvents([]abci.Event{
-		{Type: "account", Attributes: []cmn.KVPair{{Key: []byte("number"), Value: []byte("3")}}},
+		{Type: "account", Attributes: []kv.Pair{{Key: []byte("number"), Value: []byte("3")}}},
 	})
 	txResult3.Tx = types.Tx("Jack's account")
 	txResult3.Height = 1
@@ -259,7 +260,7 @@ func TestTxSearchMultipleTxs(t *testing.T) {
 	// indexed fourth (to test we don't include txs with similar events)
 	// https://github.com/tendermint/tendermint/issues/2908
 	txResult4 := txResultWithEvents([]abci.Event{
-		{Type: "account", Attributes: []cmn.KVPair{{Key: []byte("number.id"), Value: []byte("1")}}},
+		{Type: "account", Attributes: []kv.Pair{{Key: []byte("number.id"), Value: []byte("1")}}},
 	})
 	txResult4.Tx = types.Tx("Mike's account")
 	txResult4.Height = 2
@@ -278,8 +279,8 @@ func TestIndexAllTags(t *testing.T) {
 	indexer := NewTxIndex(db.NewMemDB(), IndexAllEvents())
 
 	txResult := txResultWithEvents([]abci.Event{
-		{Type: "account", Attributes: []cmn.KVPair{{Key: []byte("owner"), Value: []byte("Ivan")}}},
-		{Type: "account", Attributes: []cmn.KVPair{{Key: []byte("number"), Value: []byte("1")}}},
+		{Type: "account", Attributes: []kv.Pair{{Key: []byte("owner"), Value: []byte("Ivan")}}},
+		{Type: "account", Attributes: []kv.Pair{{Key: []byte("number"), Value: []byte("1")}}},
 	})
 
 	err := indexer.Index(txResult)
diff --git a/libs/common/int.go b/state/txindex/kv/utils.go
similarity index 70%
rename from libs/common/int.go
rename to state/txindex/kv/utils.go
index 845dc97f6..48362bfbc 100644
--- a/libs/common/int.go
+++ b/state/txindex/kv/utils.go
@@ -1,7 +1,7 @@
-package common
+package kv
 
 // IntInSlice returns true if a is found in the list.
-func IntInSlice(a int, list []int) bool {
+func intInSlice(a int, list []int) bool {
 	for _, b := range list {
 		if b == a {
 			return true
diff --git a/state/txindex/kv/utils_test.go b/state/txindex/kv/utils_test.go
new file mode 100644
index 000000000..5606de921
--- /dev/null
+++ b/state/txindex/kv/utils_test.go
@@ -0,0 +1,14 @@
+package kv
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIntInSlice(t *testing.T) {
+	assert.True(t, intInSlice(1, []int{1, 2, 3}))
+	assert.False(t, intInSlice(4, []int{1, 2, 3}))
+	assert.True(t, intInSlice(0, []int{0}))
+	assert.False(t, intInSlice(0, []int{}))
+}
diff --git a/types/event_bus_test.go b/types/event_bus_test.go
index c56f2b244..edc473f2c 100644
--- a/types/event_bus_test.go
+++ b/types/event_bus_test.go
@@ -11,6 +11,7 @@ import (
 
 	abci "github.com/tendermint/tendermint/abci/types"
 	cmn "github.com/tendermint/tendermint/libs/common"
+	"github.com/tendermint/tendermint/libs/kv"
 	tmpubsub "github.com/tendermint/tendermint/libs/pubsub"
 	tmquery "github.com/tendermint/tendermint/libs/pubsub/query"
 )
@@ -25,7 +26,7 @@ func TestEventBusPublishEventTx(t *testing.T) {
 	result := abci.ResponseDeliverTx{
 		Data: []byte("bar"),
 		Events: []abci.Event{
-			{Type: "testType", Attributes: []cmn.KVPair{{Key: []byte("baz"), Value: []byte("1")}}},
+			{Type: "testType", Attributes: []kv.Pair{{Key: []byte("baz"), Value: []byte("1")}}},
 		},
 	}
 
@@ -69,12 +70,12 @@ func TestEventBusPublishEventNewBlock(t *testing.T) {
 	block := MakeBlock(0, []Tx{}, nil, []Evidence{})
 	resultBeginBlock := abci.ResponseBeginBlock{
 		Events: []abci.Event{
-			{Type: "testType", Attributes: []cmn.KVPair{{Key: []byte("baz"), Value: []byte("1")}}},
+			{Type: "testType", Attributes: []kv.Pair{{Key: []byte("baz"), Value: []byte("1")}}},
 		},
 	}
 	resultEndBlock := abci.ResponseEndBlock{
 		Events: []abci.Event{
-			{Type: "testType", Attributes: []cmn.KVPair{{Key: []byte("foz"), Value: []byte("2")}}},
+			{Type: "testType", Attributes: []kv.Pair{{Key: []byte("foz"), Value: []byte("2")}}},
 		},
 	}
 
@@ -119,7 +120,7 @@ func TestEventBusPublishEventTxDuplicateKeys(t *testing.T) {
 		Events: []abci.Event{
 			{
 				Type: "transfer",
-				Attributes: []cmn.KVPair{
+				Attributes: []kv.Pair{
 					{Key: []byte("sender"), Value: []byte("foo")},
 					{Key: []byte("recipient"), Value: []byte("bar")},
 					{Key: []byte("amount"), Value: []byte("5")},
@@ -127,7 +128,7 @@ func TestEventBusPublishEventTxDuplicateKeys(t *testing.T) {
 			},
 			{
 				Type: "transfer",
-				Attributes: []cmn.KVPair{
+				Attributes: []kv.Pair{
 					{Key: []byte("sender"), Value: []byte("baz")},
 					{Key: []byte("recipient"), Value: []byte("cat")},
 					{Key: []byte("amount"), Value: []byte("13")},
@@ -135,7 +136,7 @@ func TestEventBusPublishEventTxDuplicateKeys(t *testing.T) {
 			},
 			{
 				Type: "withdraw.rewards",
-				Attributes: []cmn.KVPair{
+				Attributes: []kv.Pair{
 					{Key: []byte("address"), Value: []byte("bar")},
 					{Key: []byte("source"), Value: []byte("iceman")},
 					{Key: []byte("amount"), Value: []byte("33")},
@@ -216,12 +217,12 @@ func TestEventBusPublishEventNewBlockHeader(t *testing.T) {
 	block := MakeBlock(0, []Tx{}, nil, []Evidence{})
 	resultBeginBlock := abci.ResponseBeginBlock{
 		Events: []abci.Event{
-			{Type: "testType", Attributes: []cmn.KVPair{{Key: []byte("baz"), Value: []byte("1")}}},
+			{Type: "testType", Attributes: []kv.Pair{{Key: []byte("baz"), Value: []byte("1")}}},
 		},
 	}
 	resultEndBlock := abci.ResponseEndBlock{
 		Events: []abci.Event{
-			{Type: "testType", Attributes: []cmn.KVPair{{Key: []byte("foz"), Value: []byte("2")}}},
+			{Type: "testType", Attributes: []kv.Pair{{Key: []byte("foz"), Value: []byte("2")}}},
 		},
 	}