diff --git a/CHANGELOG_PENDING.md b/CHANGELOG_PENDING.md
index c0baaaee0..928ca3897 100644
--- a/CHANGELOG_PENDING.md
+++ b/CHANGELOG_PENDING.md
@@ -8,6 +8,8 @@ Friendly reminder, we have a [bug bounty program](https://hackerone.com/tendermi
 
 ### FEATURES:
 
+- [privval] \#5239 Add `chainID` to requests from client.
+
 ### IMPROVEMENTS:
 
 ### BUG FIXES:
diff --git a/UPGRADING.md b/UPGRADING.md
index f7746497e..7f9d2e6e3 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -136,9 +136,15 @@ RPC client can be found in `/rpc` directory. HTTP(S) proxy is located in
 ### State
 
 A field `State.InitialHeight` has been added to record the initial chain height, which must be `1`
-(not `0`) if starting from height `1`. This can be configured via the genesis field 
+(not `0`) if starting from height `1`. This can be configured via the genesis field
 `initial_height`.
 
+### Privval
+
+All requests are now accompanied by the chainID from the network.
+This is a optional field and can be ignored by key management systems. It
+is recommended to check the chainID if using the same key management system for multiple chains.
+
 ## v0.33.4
 
 ### Go API
diff --git a/node/node.go b/node/node.go
index 9b8d55906..3fbb37f62 100644
--- a/node/node.go
+++ b/node/node.go
@@ -655,7 +655,7 @@ func NewNode(config *cfg.Config,
 	// external signing process.
 	if config.PrivValidatorListenAddr != "" {
 		// FIXME: we should start services inside OnStart
-		privValidator, err = createAndStartPrivValidatorSocketClient(config.PrivValidatorListenAddr, logger)
+		privValidator, err = createAndStartPrivValidatorSocketClient(config.PrivValidatorListenAddr, genDoc.ChainID, logger)
 		if err != nil {
 			return nil, fmt.Errorf("error with private validator socket client: %w", err)
 		}
@@ -1312,7 +1312,8 @@ func saveGenesisDoc(db dbm.DB, genDoc *types.GenesisDoc) error {
 }
 
 func createAndStartPrivValidatorSocketClient(
-	listenAddr string,
+	listenAddr,
+	chainID string,
 	logger log.Logger,
 ) (types.PrivValidator, error) {
 	pve, err := privval.NewSignerListener(listenAddr, logger)
@@ -1320,7 +1321,7 @@ func createAndStartPrivValidatorSocketClient(
 		return nil, fmt.Errorf("failed to start private validator: %w", err)
 	}
 
-	pvsc, err := privval.NewSignerClient(pve)
+	pvsc, err := privval.NewSignerClient(pve, chainID)
 	if err != nil {
 		return nil, fmt.Errorf("failed to start private validator: %w", err)
 	}
diff --git a/privval/signer_client.go b/privval/signer_client.go
index 107c6489c..50c462da1 100644
--- a/privval/signer_client.go
+++ b/privval/signer_client.go
@@ -15,20 +15,21 @@ import (
 // Handles remote validator connections that provide signing services
 type SignerClient struct {
 	endpoint *SignerListenerEndpoint
+	chainID  string
 }
 
 var _ types.PrivValidator = (*SignerClient)(nil)
 
 // NewSignerClient returns an instance of SignerClient.
 // it will start the endpoint (if not already started)
-func NewSignerClient(endpoint *SignerListenerEndpoint) (*SignerClient, error) {
+func NewSignerClient(endpoint *SignerListenerEndpoint, chainID string) (*SignerClient, error) {
 	if !endpoint.IsRunning() {
 		if err := endpoint.Start(); err != nil {
 			return nil, fmt.Errorf("failed to start listener endpoint: %w", err)
 		}
 	}
 
-	return &SignerClient{endpoint: endpoint}, nil
+	return &SignerClient{endpoint: endpoint, chainID: chainID}, nil
 }
 
 // Close closes the underlying connection
@@ -68,7 +69,7 @@ func (sc *SignerClient) Ping() error {
 // GetPubKey retrieves a public key from a remote signer
 // returns an error if client is not able to provide the key
 func (sc *SignerClient) GetPubKey() (crypto.PubKey, error) {
-	response, err := sc.endpoint.SendRequest(mustWrapMsg(&privvalproto.PubKeyRequest{}))
+	response, err := sc.endpoint.SendRequest(mustWrapMsg(&privvalproto.PubKeyRequest{ChainId: sc.chainID}))
 	if err != nil {
 		return nil, fmt.Errorf("send: %w", err)
 	}
@@ -91,7 +92,7 @@ func (sc *SignerClient) GetPubKey() (crypto.PubKey, error) {
 
 // SignVote requests a remote signer to sign a vote
 func (sc *SignerClient) SignVote(chainID string, vote *tmproto.Vote) error {
-	response, err := sc.endpoint.SendRequest(mustWrapMsg(&privvalproto.SignVoteRequest{Vote: vote}))
+	response, err := sc.endpoint.SendRequest(mustWrapMsg(&privvalproto.SignVoteRequest{Vote: vote, ChainId: chainID}))
 	if err != nil {
 		return err
 	}
@@ -111,7 +112,9 @@ func (sc *SignerClient) SignVote(chainID string, vote *tmproto.Vote) error {
 
 // SignProposal requests a remote signer to sign a proposal
 func (sc *SignerClient) SignProposal(chainID string, proposal *tmproto.Proposal) error {
-	response, err := sc.endpoint.SendRequest(mustWrapMsg(&privvalproto.SignProposalRequest{Proposal: proposal}))
+	response, err := sc.endpoint.SendRequest(mustWrapMsg(
+		&privvalproto.SignProposalRequest{Proposal: proposal, ChainId: chainID},
+	))
 	if err != nil {
 		return err
 	}
diff --git a/privval/signer_client_test.go b/privval/signer_client_test.go
index 143174a94..d169a875a 100644
--- a/privval/signer_client_test.go
+++ b/privval/signer_client_test.go
@@ -33,7 +33,7 @@ func getSignerTestCases(t *testing.T) []signerTestCase {
 
 		// get a pair of signer listener, signer dialer endpoints
 		sl, sd := getMockEndpoints(t, dtc.addr, dtc.dialer)
-		sc, err := NewSignerClient(sl)
+		sc, err := NewSignerClient(sl, chainID)
 		require.NoError(t, err)
 		ss := NewSignerServer(sd, chainID, mockPV)
 
diff --git a/privval/signer_requestHandler.go b/privval/signer_requestHandler.go
index 5322682dd..075193541 100644
--- a/privval/signer_requestHandler.go
+++ b/privval/signer_requestHandler.go
@@ -21,6 +21,13 @@ func DefaultValidationRequestHandler(
 
 	switch r := req.Sum.(type) {
 	case *privvalproto.Message_PubKeyRequest:
+		if r.PubKeyRequest.GetChainId() != chainID {
+			res = mustWrapMsg(&privvalproto.SignedVoteResponse{
+				Vote: nil, Error: &privvalproto.RemoteSignerError{
+					Code: 0, Description: "unable to provide pubkey"}})
+			return res, fmt.Errorf("want chainID: %s, got chainID: %s", r.PubKeyRequest.GetChainId(), chainID)
+		}
+
 		var pubKey crypto.PubKey
 		pubKey, err = privVal.GetPubKey()
 		pk, err := cryptoenc.PubKeyToProto(pubKey)
@@ -36,6 +43,13 @@ func DefaultValidationRequestHandler(
 		}
 
 	case *privvalproto.Message_SignVoteRequest:
+		if r.SignVoteRequest.ChainId != chainID {
+			res = mustWrapMsg(&privvalproto.SignedVoteResponse{
+				Vote: nil, Error: &privvalproto.RemoteSignerError{
+					Code: 0, Description: "unable to sign vote"}})
+			return res, fmt.Errorf("want chainID: %s, got chainID: %s", r.SignVoteRequest.GetChainId(), chainID)
+		}
+
 		vote := r.SignVoteRequest.Vote
 
 		err = privVal.SignVote(chainID, vote)
@@ -47,6 +61,14 @@ func DefaultValidationRequestHandler(
 		}
 
 	case *privvalproto.Message_SignProposalRequest:
+		if r.SignProposalRequest.GetChainId() != chainID {
+			res = mustWrapMsg(&privvalproto.SignedVoteResponse{
+				Vote: nil, Error: &privvalproto.RemoteSignerError{
+					Code:        0,
+					Description: "unable to sign proposal"}})
+			return res, fmt.Errorf("want chainID: %s, got chainID: %s", r.SignProposalRequest.GetChainId(), chainID)
+		}
+
 		proposal := r.SignProposalRequest.Proposal
 
 		err = privVal.SignProposal(chainID, proposal)
diff --git a/proto/tendermint/privval/types.pb.go b/proto/tendermint/privval/types.pb.go
index 8a882f8cf..f376d168f 100644
--- a/proto/tendermint/privval/types.pb.go
+++ b/proto/tendermint/privval/types.pb.go
@@ -5,7 +5,6 @@ package privval
 
 import (
 	fmt "fmt"
-	_ "github.com/gogo/protobuf/gogoproto"
 	proto "github.com/gogo/protobuf/proto"
 	crypto "github.com/tendermint/tendermint/proto/tendermint/crypto"
 	types "github.com/tendermint/tendermint/proto/tendermint/types"
@@ -116,6 +115,7 @@ func (m *RemoteSignerError) GetDescription() string {
 
 // PubKeyRequest requests the consensus public key from the remote signer.
 type PubKeyRequest struct {
+	ChainId string `protobuf:"bytes,1,opt,name=chain_id,json=chainId,proto3" json:"chain_id,omitempty"`
 }
 
 func (m *PubKeyRequest) Reset()         { *m = PubKeyRequest{} }
@@ -151,6 +151,13 @@ func (m *PubKeyRequest) XXX_DiscardUnknown() {
 
 var xxx_messageInfo_PubKeyRequest proto.InternalMessageInfo
 
+func (m *PubKeyRequest) GetChainId() string {
+	if m != nil {
+		return m.ChainId
+	}
+	return ""
+}
+
 // PubKeyResponse is a response message containing the public key.
 type PubKeyResponse struct {
 	PubKey *crypto.PublicKey  `protobuf:"bytes,1,opt,name=pub_key,json=pubKey,proto3" json:"pub_key,omitempty"`
@@ -206,7 +213,8 @@ func (m *PubKeyResponse) GetError() *RemoteSignerError {
 
 // SignVoteRequest is a request to sign a vote
 type SignVoteRequest struct {
-	Vote *types.Vote `protobuf:"bytes,1,opt,name=vote,proto3" json:"vote,omitempty"`
+	Vote    *types.Vote `protobuf:"bytes,1,opt,name=vote,proto3" json:"vote,omitempty"`
+	ChainId string      `protobuf:"bytes,2,opt,name=chain_id,json=chainId,proto3" json:"chain_id,omitempty"`
 }
 
 func (m *SignVoteRequest) Reset()         { *m = SignVoteRequest{} }
@@ -249,6 +257,13 @@ func (m *SignVoteRequest) GetVote() *types.Vote {
 	return nil
 }
 
+func (m *SignVoteRequest) GetChainId() string {
+	if m != nil {
+		return m.ChainId
+	}
+	return ""
+}
+
 // SignedVoteResponse is a response containing a signed vote or an error
 type SignedVoteResponse struct {
 	Vote  *types.Vote        `protobuf:"bytes,1,opt,name=vote,proto3" json:"vote,omitempty"`
@@ -305,6 +320,7 @@ func (m *SignedVoteResponse) GetError() *RemoteSignerError {
 // SignProposalRequest is a request to sign a proposal
 type SignProposalRequest struct {
 	Proposal *types.Proposal `protobuf:"bytes,1,opt,name=proposal,proto3" json:"proposal,omitempty"`
+	ChainId  string          `protobuf:"bytes,2,opt,name=chain_id,json=chainId,proto3" json:"chain_id,omitempty"`
 }
 
 func (m *SignProposalRequest) Reset()         { *m = SignProposalRequest{} }
@@ -347,6 +363,13 @@ func (m *SignProposalRequest) GetProposal() *types.Proposal {
 	return nil
 }
 
+func (m *SignProposalRequest) GetChainId() string {
+	if m != nil {
+		return m.ChainId
+	}
+	return ""
+}
+
 // SignedProposalResponse is response containing a signed proposal or an error
 type SignedProposalResponse struct {
 	Proposal *types.Proposal    `protobuf:"bytes,1,opt,name=proposal,proto3" json:"proposal,omitempty"`
@@ -654,52 +677,53 @@ func init() {
 func init() { proto.RegisterFile("tendermint/privval/types.proto", fileDescriptor_cb4e437a5328cf9c) }
 
 var fileDescriptor_cb4e437a5328cf9c = []byte{
-	// 711 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xa4, 0x95, 0xcf, 0x6e, 0xd3, 0x4a,
-	0x14, 0xc6, 0xed, 0x36, 0x49, 0x7b, 0x4f, 0x9a, 0x3f, 0x9d, 0xf6, 0xf6, 0xe6, 0x46, 0xbd, 0xbe,
-	0xc1, 0x08, 0xa8, 0xba, 0x48, 0xa4, 0x22, 0x90, 0x10, 0x62, 0x41, 0x5b, 0x8b, 0x44, 0x55, 0xed,
-	0x30, 0x49, 0x29, 0xaa, 0x84, 0xac, 0x26, 0x19, 0x8c, 0xd5, 0xc6, 0x33, 0x78, 0x9c, 0x4a, 0x59,
-	0xb0, 0x63, 0x8b, 0xc4, 0x63, 0xb0, 0xe6, 0x29, 0x58, 0x76, 0xc9, 0x12, 0xb5, 0x2f, 0x82, 0x3c,
-	0x9e, 0x38, 0x6e, 0xfe, 0x20, 0x41, 0x77, 0x9e, 0xf3, 0xcd, 0xfc, 0xce, 0x77, 0x3c, 0x9f, 0x34,
-	0xa0, 0x05, 0xc4, 0xeb, 0x11, 0xbf, 0xef, 0x7a, 0x41, 0x8d, 0xf9, 0xee, 0xc5, 0xc5, 0xe9, 0x79,
-	0x2d, 0x18, 0x32, 0xc2, 0xab, 0xcc, 0xa7, 0x01, 0x45, 0x68, 0xac, 0x57, 0xa5, 0x5e, 0x5e, 0x77,
-	0xa8, 0x43, 0x85, 0x5c, 0x0b, 0xbf, 0xa2, 0x9d, 0xe5, 0xcd, 0x04, 0xa9, 0xeb, 0x0f, 0x59, 0x40,
-	0x6b, 0x67, 0x64, 0xc8, 0x67, 0xa8, 0x82, 0x9f, 0xec, 0xa2, 0x37, 0x60, 0x15, 0x93, 0x3e, 0x0d,
-	0x48, 0xcb, 0x75, 0x3c, 0xe2, 0x1b, 0xbe, 0x4f, 0x7d, 0x84, 0x20, 0xd5, 0xa5, 0x3d, 0x52, 0x52,
-	0x2b, 0xea, 0x56, 0x1a, 0x8b, 0x6f, 0x54, 0x81, 0x6c, 0x8f, 0xf0, 0xae, 0xef, 0xb2, 0xc0, 0xa5,
-	0x5e, 0x69, 0xa1, 0xa2, 0x6e, 0xfd, 0x85, 0x93, 0x25, 0xbd, 0x00, 0xb9, 0xe6, 0xa0, 0x73, 0x40,
-	0x86, 0x98, 0xbc, 0x1f, 0x10, 0x1e, 0xe8, 0x1f, 0x55, 0xc8, 0x8f, 0x2a, 0x9c, 0x51, 0x8f, 0x13,
-	0xf4, 0x08, 0x96, 0xd8, 0xa0, 0x63, 0x9f, 0x91, 0xa1, 0x80, 0x67, 0x77, 0x36, 0xab, 0x89, 0x31,
-	0x23, 0xf3, 0xd5, 0xe6, 0xa0, 0x73, 0xee, 0x76, 0xc3, 0x63, 0x19, 0x26, 0x8e, 0xa3, 0xa7, 0x90,
-	0x26, 0xa1, 0x33, 0xd1, 0x36, 0xbb, 0x73, 0xaf, 0x3a, 0xfd, 0x6f, 0xaa, 0x53, 0x63, 0xe0, 0xe8,
-	0x8c, 0xfe, 0x0c, 0x0a, 0x61, 0xf5, 0x15, 0x0d, 0x88, 0x74, 0x86, 0xb6, 0x21, 0x75, 0x41, 0x03,
-	0x22, 0x3d, 0x6c, 0x24, 0x71, 0xd1, 0xcf, 0x11, 0x9b, 0xc5, 0x1e, 0xfd, 0x03, 0x20, 0x01, 0xed,
-	0x45, 0x00, 0x39, 0xc8, 0x6f, 0x10, 0x6e, 0xe7, 0xfe, 0x10, 0xd6, 0xc2, 0x6a, 0xd3, 0xa7, 0x8c,
-	0xf2, 0xd3, 0xf3, 0xd1, 0x04, 0x8f, 0x61, 0x99, 0xc9, 0x92, 0xf4, 0x50, 0x9e, 0xf6, 0x10, 0x1f,
-	0x8a, 0xf7, 0xea, 0x9f, 0x54, 0xd8, 0x88, 0xc6, 0x19, 0x13, 0xe5, 0x48, 0x7f, 0x88, 0xbc, 0xdd,
-	0x78, 0x39, 0xc8, 0x36, 0x5d, 0xcf, 0x19, 0x45, 0x26, 0x0f, 0x2b, 0xd1, 0x32, 0xf2, 0xa4, 0x7f,
-	0x4d, 0xc3, 0xd2, 0x21, 0xe1, 0xfc, 0xd4, 0x21, 0xe8, 0x00, 0x0a, 0x32, 0x3b, 0xb6, 0x1f, 0x6d,
-	0x97, 0x36, 0xef, 0xcc, 0xea, 0x78, 0x23, 0x8a, 0x75, 0x05, 0xe7, 0x58, 0xb2, 0x80, 0x4c, 0x28,
-	0x8e, 0x61, 0x51, 0x33, 0xe9, 0x5f, 0xff, 0x15, 0x2d, 0xda, 0x59, 0x57, 0x70, 0x9e, 0xdd, 0x0c,
-	0xf6, 0x4b, 0x58, 0xe5, 0xae, 0xe3, 0xd9, 0xe1, 0x85, 0xc7, 0xf6, 0x16, 0x05, 0xf0, 0xee, 0x2c,
-	0xe0, 0x44, 0x22, 0xeb, 0x0a, 0x2e, 0xf0, 0x89, 0x90, 0x9e, 0xc0, 0x3a, 0x17, 0x37, 0x35, 0x82,
-	0x4a, 0x9b, 0x29, 0x41, 0xbd, 0x3f, 0x8f, 0x7a, 0x33, 0xa8, 0x75, 0x05, 0x23, 0x3e, 0x1d, 0xdf,
-	0x37, 0xf0, 0xb7, 0xb0, 0x3b, 0xba, 0xc4, 0xd8, 0x72, 0x5a, 0xc0, 0x1f, 0xcc, 0x83, 0x4f, 0xc4,
-	0xb0, 0xae, 0xe0, 0x35, 0x3e, 0x23, 0x9d, 0x6f, 0xa1, 0x24, 0xad, 0x27, 0x1a, 0x48, 0xfb, 0x19,
-	0xd1, 0x61, 0x7b, 0xbe, 0xfd, 0xc9, 0x60, 0xd6, 0x15, 0xbc, 0xc1, 0x67, 0x47, 0x76, 0x1f, 0x56,
-	0x98, 0xeb, 0x39, 0xb1, 0xfb, 0x25, 0xc1, 0xfe, 0x7f, 0xe6, 0x0d, 0x8e, 0x53, 0x56, 0x57, 0x70,
-	0x96, 0x8d, 0x97, 0xe8, 0x05, 0xe4, 0x24, 0x45, 0x5a, 0x5c, 0x16, 0x98, 0xca, 0x7c, 0x4c, 0x6c,
-	0x6c, 0x85, 0x25, 0xd6, 0xbb, 0x69, 0x58, 0xe4, 0x83, 0xfe, 0xf6, 0x17, 0x15, 0x32, 0x22, 0xe4,
-	0x1c, 0x21, 0xc8, 0x1b, 0x18, 0x5b, 0xb8, 0x65, 0x1f, 0x99, 0x07, 0xa6, 0x75, 0x6c, 0x16, 0x15,
-	0xa4, 0x41, 0x39, 0xae, 0x19, 0xaf, 0x9b, 0xc6, 0x5e, 0xdb, 0xd8, 0xb7, 0xb1, 0xd1, 0x6a, 0x5a,
-	0x66, 0xcb, 0x28, 0xaa, 0xa8, 0x04, 0xeb, 0x52, 0x37, 0x2d, 0x7b, 0xcf, 0x32, 0x4d, 0x63, 0xaf,
-	0xdd, 0xb0, 0xcc, 0xe2, 0x02, 0xfa, 0x0f, 0xfe, 0x95, 0xca, 0xb8, 0x6c, 0xb7, 0x1b, 0x87, 0x86,
-	0x75, 0xd4, 0x2e, 0x2e, 0xa2, 0x7f, 0x60, 0x4d, 0xca, 0xd8, 0x78, 0xbe, 0x1f, 0x0b, 0xa9, 0x04,
-	0xf1, 0x18, 0x37, 0xda, 0x46, 0xac, 0xa4, 0x77, 0x5b, 0xdf, 0xae, 0x34, 0xf5, 0xf2, 0x4a, 0x53,
-	0x7f, 0x5c, 0x69, 0xea, 0xe7, 0x6b, 0x4d, 0xb9, 0xbc, 0xd6, 0x94, 0xef, 0xd7, 0x9a, 0x72, 0xf2,
-	0xc4, 0x71, 0x83, 0x77, 0x83, 0x4e, 0xb5, 0x4b, 0xfb, 0xb5, 0xe4, 0x0b, 0x92, 0x7c, 0xb4, 0xc2,
-	0x77, 0x68, 0xfa, 0x15, 0xeb, 0x64, 0x84, 0xf2, 0xf0, 0x67, 0x00, 0x00, 0x00, 0xff, 0xff, 0xbe,
-	0xc8, 0xae, 0x83, 0xe2, 0x06, 0x00, 0x00,
+	// 724 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xa4, 0x55, 0x4d, 0x4f, 0xdb, 0x4a,
+	0x14, 0xb5, 0x21, 0x1f, 0x70, 0x43, 0x42, 0x18, 0x78, 0xbc, 0x80, 0x78, 0x7e, 0x79, 0x79, 0x6a,
+	0x8b, 0xb2, 0x48, 0x24, 0xaa, 0x56, 0xaa, 0xba, 0x2a, 0x60, 0x35, 0x11, 0xc2, 0x4e, 0x27, 0xa1,
+	0x20, 0xa4, 0xca, 0xca, 0xc7, 0x34, 0x58, 0x10, 0xcf, 0xd4, 0xe3, 0x20, 0x65, 0xd1, 0x5d, 0xb7,
+	0x95, 0xfa, 0x33, 0xba, 0xee, 0xaf, 0xe8, 0x92, 0x65, 0x97, 0x15, 0xfc, 0x91, 0x2a, 0xe3, 0x89,
+	0x63, 0xe7, 0x03, 0xa9, 0x65, 0x97, 0xb9, 0xe7, 0xde, 0x73, 0xcf, 0xf1, 0x9c, 0x68, 0x40, 0xf3,
+	0x88, 0xd3, 0x21, 0x6e, 0xcf, 0x76, 0xbc, 0x32, 0x73, 0xed, 0xeb, 0xeb, 0xe6, 0x55, 0xd9, 0x1b,
+	0x30, 0xc2, 0x4b, 0xcc, 0xa5, 0x1e, 0x45, 0x68, 0x8c, 0x97, 0x24, 0xbe, 0xbd, 0x13, 0x9a, 0x69,
+	0xbb, 0x03, 0xe6, 0xd1, 0xf2, 0x25, 0x19, 0xc8, 0x89, 0x08, 0x2a, 0x98, 0xc2, 0x7c, 0x85, 0x2a,
+	0xac, 0x61, 0xd2, 0xa3, 0x1e, 0xa9, 0xdb, 0x5d, 0x87, 0xb8, 0xba, 0xeb, 0x52, 0x17, 0x21, 0x88,
+	0xb5, 0x69, 0x87, 0xe4, 0xd4, 0xbc, 0xba, 0x1b, 0xc7, 0xe2, 0x37, 0xca, 0x43, 0xaa, 0x43, 0x78,
+	0xdb, 0xb5, 0x99, 0x67, 0x53, 0x27, 0xb7, 0x90, 0x57, 0x77, 0x97, 0x71, 0xb8, 0x54, 0x28, 0x42,
+	0xba, 0xd6, 0x6f, 0x1d, 0x91, 0x01, 0x26, 0x1f, 0xfa, 0x84, 0x7b, 0x68, 0x0b, 0x96, 0xda, 0x17,
+	0x4d, 0xdb, 0xb1, 0xec, 0x8e, 0xa0, 0x5a, 0xc6, 0x49, 0x71, 0xae, 0x76, 0x0a, 0x9f, 0x54, 0xc8,
+	0x8c, 0x9a, 0x39, 0xa3, 0x0e, 0x27, 0xe8, 0x19, 0x24, 0x59, 0xbf, 0x65, 0x5d, 0x92, 0x81, 0x68,
+	0x4e, 0xed, 0xed, 0x94, 0x42, 0x5e, 0x7d, 0x5f, 0xa5, 0x5a, 0xbf, 0x75, 0x65, 0xb7, 0x87, 0x63,
+	0x09, 0x26, 0xc6, 0xd1, 0x4b, 0x88, 0x93, 0xa1, 0x68, 0xa1, 0x28, 0xb5, 0xf7, 0xa8, 0x34, 0xfd,
+	0x81, 0x4a, 0x53, 0x0e, 0xb1, 0x3f, 0x53, 0x38, 0x83, 0xd5, 0x61, 0xf5, 0x2d, 0xf5, 0xc8, 0x48,
+	0x74, 0x11, 0x62, 0xd7, 0xd4, 0x23, 0x52, 0xc3, 0x66, 0x98, 0xce, 0xff, 0x6e, 0xa2, 0x59, 0xf4,
+	0x44, 0x0c, 0x2e, 0x44, 0x0d, 0x7e, 0x04, 0x24, 0xf6, 0x75, 0x7c, 0x6e, 0xe9, 0xf1, 0x77, 0xc8,
+	0x1f, 0x64, 0xec, 0x02, 0xd6, 0x87, 0xd5, 0x9a, 0x4b, 0x19, 0xe5, 0xcd, 0xab, 0x91, 0xb9, 0xe7,
+	0xb0, 0xc4, 0x64, 0x49, 0x6a, 0xd8, 0x9e, 0xd6, 0x10, 0x0c, 0x05, 0xbd, 0xf7, 0x19, 0xfd, 0xac,
+	0xc2, 0xa6, 0xef, 0x74, 0xbc, 0x4c, 0xba, 0xfd, 0xd3, 0x6d, 0x0f, 0x72, 0x9e, 0x86, 0x54, 0xcd,
+	0x76, 0xba, 0xd2, 0x71, 0x21, 0x03, 0x2b, 0xfe, 0xd1, 0xd7, 0x54, 0xf8, 0x16, 0x87, 0xe4, 0x31,
+	0xe1, 0xbc, 0xd9, 0x25, 0xe8, 0x08, 0x56, 0x65, 0xe2, 0x2c, 0xd7, 0x6f, 0x97, 0x32, 0xff, 0x9b,
+	0xb5, 0x31, 0x92, 0xed, 0x8a, 0x82, 0xd3, 0x2c, 0x12, 0x76, 0x03, 0xb2, 0x63, 0x32, 0x7f, 0x99,
+	0xd4, 0x5f, 0xb8, 0x8f, 0xcd, 0xef, 0xac, 0x28, 0x38, 0xc3, 0xa2, 0x7f, 0x87, 0x37, 0xb0, 0xc6,
+	0xed, 0xae, 0x63, 0x0d, 0xb3, 0x10, 0xc8, 0x5b, 0x14, 0x84, 0xff, 0xcf, 0x22, 0x9c, 0xc8, 0x71,
+	0x45, 0xc1, 0xab, 0x7c, 0x22, 0xda, 0xe7, 0xb0, 0xc1, 0xc5, 0x4d, 0x8d, 0x48, 0xa5, 0xcc, 0x98,
+	0x60, 0x7d, 0x3c, 0x8f, 0x35, 0x9a, 0xe1, 0x8a, 0x82, 0x11, 0x9f, 0x4e, 0xf6, 0x3b, 0xf8, 0x4b,
+	0xc8, 0x1d, 0x5d, 0x62, 0x20, 0x39, 0x2e, 0xc8, 0x9f, 0xcc, 0x23, 0x9f, 0x48, 0x68, 0x45, 0xc1,
+	0xeb, 0x7c, 0x46, 0x70, 0xdf, 0x43, 0x4e, 0x4a, 0x0f, 0x2d, 0x90, 0xf2, 0x13, 0x62, 0x43, 0x71,
+	0xbe, 0xfc, 0xc9, 0x60, 0x56, 0x14, 0xbc, 0xc9, 0x67, 0x47, 0xf6, 0x10, 0x56, 0x98, 0xed, 0x74,
+	0x03, 0xf5, 0x49, 0xc1, 0xfd, 0xef, 0xcc, 0x1b, 0x1c, 0xa7, 0xac, 0xa2, 0xe0, 0x14, 0x1b, 0x1f,
+	0xd1, 0x6b, 0x48, 0x4b, 0x16, 0x29, 0x71, 0x49, 0xd0, 0xe4, 0xe7, 0xd3, 0x04, 0xc2, 0x56, 0x58,
+	0xe8, 0xbc, 0x1f, 0x87, 0x45, 0xde, 0xef, 0x15, 0xbf, 0xaa, 0x90, 0x10, 0x21, 0xe7, 0x08, 0x41,
+	0x46, 0xc7, 0xd8, 0xc4, 0x75, 0xeb, 0xc4, 0x38, 0x32, 0xcc, 0x53, 0x23, 0xab, 0x20, 0x0d, 0xb6,
+	0x83, 0x9a, 0x7e, 0x56, 0xd3, 0x0f, 0x1a, 0xfa, 0xa1, 0x85, 0xf5, 0x7a, 0xcd, 0x34, 0xea, 0x7a,
+	0x56, 0x45, 0x39, 0xd8, 0x90, 0xb8, 0x61, 0x5a, 0x07, 0xa6, 0x61, 0xe8, 0x07, 0x8d, 0xaa, 0x69,
+	0x64, 0x17, 0xd0, 0x3f, 0xb0, 0x25, 0x91, 0x71, 0xd9, 0x6a, 0x54, 0x8f, 0x75, 0xf3, 0xa4, 0x91,
+	0x5d, 0x44, 0x7f, 0xc3, 0xba, 0x84, 0xb1, 0xfe, 0xea, 0x30, 0x00, 0x62, 0x21, 0xc6, 0x53, 0x5c,
+	0x6d, 0xe8, 0x01, 0x12, 0xdf, 0xaf, 0x7f, 0xbf, 0xd5, 0xd4, 0x9b, 0x5b, 0x4d, 0xfd, 0x79, 0xab,
+	0xa9, 0x5f, 0xee, 0x34, 0xe5, 0xe6, 0x4e, 0x53, 0x7e, 0xdc, 0x69, 0xca, 0xf9, 0x8b, 0xae, 0xed,
+	0x5d, 0xf4, 0x5b, 0xa5, 0x36, 0xed, 0x95, 0xc3, 0x4f, 0x52, 0xf8, 0xbd, 0xa3, 0x1e, 0x2d, 0x4f,
+	0x3f, 0x80, 0xad, 0x84, 0x40, 0x9e, 0xfe, 0x0a, 0x00, 0x00, 0xff, 0xff, 0x5b, 0xb0, 0xa7, 0xec,
+	0x1d, 0x07, 0x00, 0x00,
 }
 
 func (m *RemoteSignerError) Marshal() (dAtA []byte, err error) {
@@ -757,6 +781,13 @@ func (m *PubKeyRequest) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if len(m.ChainId) > 0 {
+		i -= len(m.ChainId)
+		copy(dAtA[i:], m.ChainId)
+		i = encodeVarintTypes(dAtA, i, uint64(len(m.ChainId)))
+		i--
+		dAtA[i] = 0xa
+	}
 	return len(dAtA) - i, nil
 }
 
@@ -827,6 +858,13 @@ func (m *SignVoteRequest) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if len(m.ChainId) > 0 {
+		i -= len(m.ChainId)
+		copy(dAtA[i:], m.ChainId)
+		i = encodeVarintTypes(dAtA, i, uint64(len(m.ChainId)))
+		i--
+		dAtA[i] = 0x12
+	}
 	if m.Vote != nil {
 		{
 			size, err := m.Vote.MarshalToSizedBuffer(dAtA[:i])
@@ -909,6 +947,13 @@ func (m *SignProposalRequest) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if len(m.ChainId) > 0 {
+		i -= len(m.ChainId)
+		copy(dAtA[i:], m.ChainId)
+		i = encodeVarintTypes(dAtA, i, uint64(len(m.ChainId)))
+		i--
+		dAtA[i] = 0x12
+	}
 	if m.Proposal != nil {
 		{
 			size, err := m.Proposal.MarshalToSizedBuffer(dAtA[:i])
@@ -1250,6 +1295,10 @@ func (m *PubKeyRequest) Size() (n int) {
 	}
 	var l int
 	_ = l
+	l = len(m.ChainId)
+	if l > 0 {
+		n += 1 + l + sovTypes(uint64(l))
+	}
 	return n
 }
 
@@ -1280,6 +1329,10 @@ func (m *SignVoteRequest) Size() (n int) {
 		l = m.Vote.Size()
 		n += 1 + l + sovTypes(uint64(l))
 	}
+	l = len(m.ChainId)
+	if l > 0 {
+		n += 1 + l + sovTypes(uint64(l))
+	}
 	return n
 }
 
@@ -1310,6 +1363,10 @@ func (m *SignProposalRequest) Size() (n int) {
 		l = m.Proposal.Size()
 		n += 1 + l + sovTypes(uint64(l))
 	}
+	l = len(m.ChainId)
+	if l > 0 {
+		n += 1 + l + sovTypes(uint64(l))
+	}
 	return n
 }
 
@@ -1596,6 +1653,38 @@ func (m *PubKeyRequest) Unmarshal(dAtA []byte) error {
 			return fmt.Errorf("proto: PubKeyRequest: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ChainId", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowTypes
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthTypes
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthTypes
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.ChainId = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipTypes(dAtA[iNdEx:])
@@ -1810,6 +1899,38 @@ func (m *SignVoteRequest) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ChainId", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowTypes
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthTypes
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthTypes
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.ChainId = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipTypes(dAtA[iNdEx:])
@@ -2024,6 +2145,38 @@ func (m *SignProposalRequest) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ChainId", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowTypes
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthTypes
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthTypes
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.ChainId = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipTypes(dAtA[iNdEx:])
diff --git a/proto/tendermint/privval/types.proto b/proto/tendermint/privval/types.proto
index 2a4e371fe..a0bba297d 100644
--- a/proto/tendermint/privval/types.proto
+++ b/proto/tendermint/privval/types.proto
@@ -1,7 +1,6 @@
 syntax = "proto3";
 package tendermint.privval;
 
-import "gogoproto/gogo.proto";
 import "tendermint/crypto/keys.proto";
 import "tendermint/types/types.proto";
 
@@ -22,7 +21,9 @@ message RemoteSignerError {
 }
 
 // PubKeyRequest requests the consensus public key from the remote signer.
-message PubKeyRequest {}
+message PubKeyRequest {
+  string chain_id = 1;
+}
 
 // PubKeyResponse is a response message containing the public key.
 message PubKeyResponse {
@@ -32,7 +33,8 @@ message PubKeyResponse {
 
 // SignVoteRequest is a request to sign a vote
 message SignVoteRequest {
-  tendermint.types.Vote vote = 1;
+  tendermint.types.Vote vote     = 1;
+  string                chain_id = 2;
 }
 
 // SignedVoteResponse is a response containing a signed vote or an error
@@ -44,6 +46,7 @@ message SignedVoteResponse {
 // SignProposalRequest is a request to sign a proposal
 message SignProposalRequest {
   tendermint.types.Proposal proposal = 1;
+  string                    chain_id = 2;
 }
 
 // SignedProposalResponse is response containing a signed proposal or an error
diff --git a/tools/tm-signer-harness/internal/test_harness.go b/tools/tm-signer-harness/internal/test_harness.go
index 54b04bdad..28a20caed 100644
--- a/tools/tm-signer-harness/internal/test_harness.go
+++ b/tools/tm-signer-harness/internal/test_harness.go
@@ -109,7 +109,7 @@ func NewTestHarness(logger log.Logger, cfg TestHarnessConfig) (*TestHarness, err
 		return nil, newTestHarnessError(ErrFailedToCreateListener, err, "")
 	}
 
-	signerClient, err := privval.NewSignerClient(spv)
+	signerClient, err := privval.NewSignerClient(spv, st.ChainID)
 	if err != nil {
 		return nil, newTestHarnessError(ErrFailedToCreateListener, err, "")
 	}