diff --git a/client/tx/aux_builder.go b/client/tx/aux_builder.go
index 6e1d5db79bd1..0644047c151a 100644
--- a/client/tx/aux_builder.go
+++ b/client/tx/aux_builder.go
@@ -27,6 +27,12 @@ func NewAuxTxBuilder() AuxTxBuilder {
 	return AuxTxBuilder{}
 }
 
+func (b *AuxTxBuilder) SetAddress(addr string) {
+	b.checkEmptyFields()
+
+	b.auxSignerData.Address = addr
+}
+
 func (b *AuxTxBuilder) SetMemo(memo string) {
 	b.checkEmptyFields()
 
diff --git a/client/tx/aux_builder_test.go b/client/tx/aux_builder_test.go
index cc69a9f168e9..e226d46b9e1a 100644
--- a/client/tx/aux_builder_test.go
+++ b/client/tx/aux_builder_test.go
@@ -113,12 +113,30 @@ func TestAuxTxBuilder(t *testing.T) {
 			},
 			false, "",
 		},
+		{
+			"GetAuxSignerData address should not be empty",
+			func() error {
+				b.SetMsgs(msg)
+				b.SetPubKey(pk)
+				b.SetTip(tip)
+				err := b.SetSignMode(signing.SignMode_SIGN_MODE_DIRECT_AUX)
+				require.NoError(t, err)
+
+				_, err = b.GetSignBytes()
+				require.NoError(t, err)
+
+				_, err = b.GetAuxSignerData()
+				return err
+			},
+			true, "address cannot be empty: invalid request",
+		},
 		{
 			"GetAuxSignerData signature should not be empty",
 			func() error {
 				b.SetMsgs(msg)
 				b.SetPubKey(pk)
 				b.SetTip(tip)
+				b.SetAddress(addr.String())
 				err := b.SetSignMode(signing.SignMode_SIGN_MODE_DIRECT_AUX)
 				require.NoError(t, err)
 
@@ -144,6 +162,7 @@ func TestAuxTxBuilder(t *testing.T) {
 				b.SetMsgs(msg)
 				b.SetPubKey(pk)
 				b.SetTip(tip)
+				b.SetAddress(addr.String())
 				err := b.SetSignMode(signing.SignMode_SIGN_MODE_DIRECT_AUX)
 				require.NoError(t, err)
 
@@ -180,6 +199,7 @@ func TestAuxTxBuilder(t *testing.T) {
 				b.SetMsgs(msg)
 				b.SetPubKey(pk)
 				b.SetTip(tip)
+				b.SetAddress(addr.String())
 				err := b.SetSignMode(signing.SignMode_SIGN_MODE_LEGACY_AMINO_JSON)
 				require.NoError(t, err)
 
@@ -194,6 +214,7 @@ func TestAuxTxBuilder(t *testing.T) {
 				b.SetMsgs(msg)
 				b.SetPubKey(pk)
 				b.SetTip(tip)
+				b.SetAddress(addr.String())
 				err := b.SetSignMode(signing.SignMode_SIGN_MODE_LEGACY_AMINO_JSON)
 				require.NoError(t, err)
 
diff --git a/docs/core/proto-docs.md b/docs/core/proto-docs.md
index 0d1d228b384a..c780a14b5a54 100644
--- a/docs/core/proto-docs.md
+++ b/docs/core/proto-docs.md
@@ -9488,6 +9488,7 @@ Since: cosmos-sdk 0.45
 
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
+| `address` | [string](#string) |  | address is the bech32-encoded address of the auxiliary signer. If using AuxSignerData across different chains, the bech32 prefix of the target chain (where the final transaction is broadcasted) should be used. |
 | `sign_doc` | [SignDocDirectAux](#cosmos.tx.v1beta1.SignDocDirectAux) |  | sign_doc is the SIGN_MOD_DIRECT_AUX sign doc that the auxiliary signer signs. Note: we use the same sign doc even if we're signing with LEGACY_AMINO_JSON. |
 | `mode` | [cosmos.tx.signing.v1beta1.SignMode](#cosmos.tx.signing.v1beta1.SignMode) |  | mode is the signing mode of the single signer |
 | `sig` | [bytes](#bytes) |  | sig is the signature of the sign doc. |
diff --git a/proto/cosmos/tx/v1beta1/tx.proto b/proto/cosmos/tx/v1beta1/tx.proto
index 5e19e75d8e4e..5f63b9364bdd 100644
--- a/proto/cosmos/tx/v1beta1/tx.proto
+++ b/proto/cosmos/tx/v1beta1/tx.proto
@@ -229,12 +229,16 @@ message Tip {
 //
 // Since: cosmos-sdk 0.45
 message AuxSignerData {
+  // address is the bech32-encoded address of the auxiliary signer. If using
+  // AuxSignerData across different chains, the bech32 prefix of the target
+  // chain (where the final transaction is broadcasted) should be used.
+  string address = 1 [(cosmos_proto.scalar) = "cosmos.AddressString"];
 	// sign_doc is the SIGN_MOD_DIRECT_AUX sign doc that the auxiliary signer
   // signs. Note: we use the same sign doc even if we're signing with
   // LEGACY_AMINO_JSON.
-	SignDocDirectAux sign_doc = 1;
+	SignDocDirectAux sign_doc = 2;
   // mode is the signing mode of the single signer
-  cosmos.tx.signing.v1beta1.SignMode mode = 2;
+  cosmos.tx.signing.v1beta1.SignMode mode = 3;
 	// sig is the signature of the sign doc.
-	bytes sig = 3;
+	bytes sig = 4;
 }
diff --git a/types/tx/aux.go b/types/tx/aux.go
index e642088123b4..5f589ec037f9 100644
--- a/types/tx/aux.go
+++ b/types/tx/aux.go
@@ -37,6 +37,10 @@ func (s *SignDocDirectAux) UnpackInterfaces(unpacker codectypes.AnyUnpacker) err
 
 // ValidateBasic performs stateless validation of the auxiliary tx.
 func (a *AuxSignerData) ValidateBasic() error {
+	if a.Address == "" {
+		return sdkerrors.ErrInvalidRequest.Wrapf("address cannot be empty")
+	}
+
 	if a.Mode != signing.SignMode_SIGN_MODE_DIRECT_AUX && a.Mode != signing.SignMode_SIGN_MODE_LEGACY_AMINO_JSON {
 		return sdkerrors.ErrInvalidRequest.Wrapf("AuxTxBuilder can only sign with %s or %s", signing.SignMode_SIGN_MODE_DIRECT_AUX, signing.SignMode_SIGN_MODE_LEGACY_AMINO_JSON)
 	}
diff --git a/types/tx/aux_test.go b/types/tx/aux_test.go
index 5a60234a939b..de9382b4ec77 100644
--- a/types/tx/aux_test.go
+++ b/types/tx/aux_test.go
@@ -50,7 +50,7 @@ func TestSignDocDirectAux(t *testing.T) {
 
 func TestAuxSignerData(t *testing.T) {
 	bodyBz := []byte{42}
-	_, pk, _ := testdata.KeyTestPubAddr()
+	_, pk, addr := testdata.KeyTestPubAddr()
 	pkAny, err := codectypes.NewAnyWithValue(pk)
 	require.NoError(t, err)
 	sig := []byte{42}
@@ -61,11 +61,12 @@ func TestAuxSignerData(t *testing.T) {
 		sd     tx.AuxSignerData
 		expErr bool
 	}{
-		{"empty sign mode", tx.AuxSignerData{}, true},
-		{"SIGN_MODE_DIRECT", tx.AuxSignerData{Mode: signing.SignMode(signing.SignMode_SIGN_MODE_DIRECT)}, true},
-		{"no sig", tx.AuxSignerData{Mode: signing.SignMode(signing.SignMode_SIGN_MODE_DIRECT)}, true},
-		{"happy case WITH DIRECT_AUX", tx.AuxSignerData{Mode: signing.SignMode_SIGN_MODE_DIRECT_AUX, SignDoc: sd, Sig: sig}, false},
-		{"happy case WITH DIRECT_AUX", tx.AuxSignerData{Mode: signing.SignMode_SIGN_MODE_LEGACY_AMINO_JSON, SignDoc: sd, Sig: sig}, false},
+		{"empty address", tx.AuxSignerData{}, true},
+		{"empty sign mode", tx.AuxSignerData{Address: addr.String()}, true},
+		{"SIGN_MODE_DIRECT", tx.AuxSignerData{Address: addr.String(), Mode: signing.SignMode(signing.SignMode_SIGN_MODE_DIRECT)}, true},
+		{"no sig", tx.AuxSignerData{Address: addr.String(), Mode: signing.SignMode(signing.SignMode_SIGN_MODE_DIRECT)}, true},
+		{"happy case WITH DIRECT_AUX", tx.AuxSignerData{Address: addr.String(), Mode: signing.SignMode_SIGN_MODE_DIRECT_AUX, SignDoc: sd, Sig: sig}, false},
+		{"happy case WITH DIRECT_AUX", tx.AuxSignerData{Address: addr.String(), Mode: signing.SignMode_SIGN_MODE_LEGACY_AMINO_JSON, SignDoc: sd, Sig: sig}, false},
 	}
 
 	for _, tc := range testcases {
diff --git a/types/tx/tx.pb.go b/types/tx/tx.pb.go
index 7a09c9f8c554..f28f9fb6a227 100644
--- a/types/tx/tx.pb.go
+++ b/types/tx/tx.pb.go
@@ -914,14 +914,18 @@ func (m *Tip) GetTipper() string {
 //
 // Since: cosmos-sdk 0.45
 type AuxSignerData struct {
+	// address is the bech32-encoded address of the auxiliary signer. If using
+	// AuxSignerData across different chains, the bech32 prefix of the target
+	// chain (where the final transaction is broadcasted) should be used.
+	Address string `protobuf:"bytes,1,opt,name=address,proto3" json:"address,omitempty"`
 	// sign_doc is the SIGN_MOD_DIRECT_AUX sign doc that the auxiliary signer
 	// signs. Note: we use the same sign doc even if we're signing with
 	// LEGACY_AMINO_JSON.
-	SignDoc *SignDocDirectAux `protobuf:"bytes,1,opt,name=sign_doc,json=signDoc,proto3" json:"sign_doc,omitempty"`
+	SignDoc *SignDocDirectAux `protobuf:"bytes,2,opt,name=sign_doc,json=signDoc,proto3" json:"sign_doc,omitempty"`
 	// mode is the signing mode of the single signer
-	Mode signing.SignMode `protobuf:"varint,2,opt,name=mode,proto3,enum=cosmos.tx.signing.v1beta1.SignMode" json:"mode,omitempty"`
+	Mode signing.SignMode `protobuf:"varint,3,opt,name=mode,proto3,enum=cosmos.tx.signing.v1beta1.SignMode" json:"mode,omitempty"`
 	// sig is the signature of the sign doc.
-	Sig []byte `protobuf:"bytes,3,opt,name=sig,proto3" json:"sig,omitempty"`
+	Sig []byte `protobuf:"bytes,4,opt,name=sig,proto3" json:"sig,omitempty"`
 }
 
 func (m *AuxSignerData) Reset()         { *m = AuxSignerData{} }
@@ -957,6 +961,13 @@ func (m *AuxSignerData) XXX_DiscardUnknown() {
 
 var xxx_messageInfo_AuxSignerData proto.InternalMessageInfo
 
+func (m *AuxSignerData) GetAddress() string {
+	if m != nil {
+		return m.Address
+	}
+	return ""
+}
+
 func (m *AuxSignerData) GetSignDoc() *SignDocDirectAux {
 	if m != nil {
 		return m.SignDoc
@@ -997,71 +1008,71 @@ func init() {
 func init() { proto.RegisterFile("cosmos/tx/v1beta1/tx.proto", fileDescriptor_96d1575ffde80842) }
 
 var fileDescriptor_96d1575ffde80842 = []byte{
-	// 1009 bytes of a gzipped FileDescriptorProto
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+	// 1018 bytes of a gzipped FileDescriptorProto
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-	0x9f, 0x76, 0x2b, 0xbf, 0x9d, 0x76, 0x2b, 0x8f, 0x6f, 0x2e, 0xaf, 0xad, 0xaf, 0x66, 0xa3, 0x86,
-	0xe9, 0x07, 0xb7, 0xff, 0x09, 0x00, 0x00, 0xff, 0xff, 0xe3, 0xda, 0xb6, 0x89, 0x77, 0x09, 0x00,
-	0x00,
+	0xd4, 0xcb, 0x6a, 0xbc, 0x9e, 0xac, 0x47, 0xf5, 0xce, 0x2c, 0x3b, 0xb3, 0x60, 0xff, 0x08, 0xa4,
+	0x0a, 0x09, 0x71, 0xe5, 0xcc, 0x99, 0x1f, 0xd1, 0x13, 0xaa, 0x38, 0x71, 0x82, 0x2a, 0x39, 0x22,
+	0xf1, 0x17, 0x40, 0x33, 0x3b, 0xbb, 0x49, 0x8b, 0x6b, 0x17, 0xd1, 0xd3, 0xce, 0xbc, 0xf9, 0xde,
+	0x37, 0xdf, 0x9b, 0xf9, 0xf6, 0x0d, 0xb4, 0x43, 0x21, 0x63, 0x21, 0x7d, 0x35, 0xf5, 0xbf, 0xbe,
+	0x35, 0xa4, 0x8a, 0xdc, 0xf2, 0xd5, 0xd4, 0x4b, 0x52, 0xa1, 0x04, 0xba, 0x9a, 0xaf, 0x79, 0x6a,
+	0xea, 0xd9, 0xb5, 0xf6, 0x66, 0x24, 0x22, 0x61, 0x56, 0x7d, 0x3d, 0xca, 0x81, 0xed, 0x5d, 0x4b,
+	0x12, 0xa6, 0xb3, 0x44, 0x09, 0x3f, 0xce, 0x26, 0x8a, 0x49, 0x16, 0x95, 0x8c, 0x45, 0xc0, 0xc2,
+	0x3b, 0x16, 0x3e, 0x24, 0x92, 0x96, 0x98, 0x50, 0x30, 0x6e, 0xd7, 0xdf, 0x3f, 0xd7, 0x24, 0x59,
+	0xc4, 0x19, 0x3f, 0x67, 0xb2, 0x73, 0x0b, 0xdc, 0x8a, 0x84, 0x88, 0x26, 0xd4, 0x37, 0xb3, 0x61,
+	0x76, 0xe2, 0x13, 0x3e, 0x2b, 0x96, 0x72, 0x8e, 0x20, 0xd7, 0x6a, 0x0b, 0x31, 0x93, 0xee, 0xb7,
+	0x0e, 0xac, 0x1c, 0x4f, 0xd1, 0x2e, 0x54, 0x87, 0x62, 0x34, 0x6b, 0x39, 0x3b, 0x4e, 0xef, 0xd2,
+	0xfe, 0x96, 0xf7, 0xaf, 0x62, 0xbd, 0xe3, 0xe9, 0x40, 0x8c, 0x66, 0xd8, 0xc0, 0xd0, 0x5d, 0x68,
+	0x92, 0x4c, 0x8d, 0x03, 0xc6, 0x4f, 0x44, 0x6b, 0xc5, 0xe4, 0x6c, 0xcf, 0xc9, 0xe9, 0x67, 0x6a,
+	0xfc, 0x80, 0x9f, 0x08, 0xdc, 0x20, 0x76, 0x84, 0x3a, 0x00, 0x5a, 0x36, 0x51, 0x59, 0x4a, 0x65,
+	0xcb, 0xdd, 0x71, 0x7b, 0x6b, 0xf8, 0x42, 0xa4, 0xcb, 0xa1, 0x76, 0x3c, 0xc5, 0xe4, 0x1b, 0x74,
+	0x0d, 0x40, 0x6f, 0x15, 0x0c, 0x67, 0x8a, 0x4a, 0xa3, 0x6b, 0x0d, 0x37, 0x75, 0x64, 0xa0, 0x03,
+	0xe8, 0x3d, 0xb8, 0x52, 0x2a, 0xb0, 0x98, 0x15, 0x83, 0x59, 0x2f, 0xb6, 0xca, 0x71, 0xcb, 0xf6,
+	0xfb, 0xce, 0x81, 0xd5, 0x23, 0x16, 0xf1, 0x03, 0x11, 0xbe, 0xad, 0x2d, 0xb7, 0xa0, 0x11, 0x8e,
+	0x09, 0xe3, 0x01, 0x1b, 0xb5, 0xdc, 0x1d, 0xa7, 0xd7, 0xc4, 0xab, 0x66, 0xfe, 0x60, 0x84, 0x6e,
+	0xc2, 0x65, 0x12, 0x86, 0x22, 0xe3, 0x2a, 0xe0, 0x59, 0x3c, 0xa4, 0x69, 0xab, 0xba, 0xe3, 0xf4,
+	0xaa, 0x78, 0xdd, 0x46, 0xbf, 0x30, 0xc1, 0xee, 0x5f, 0x0e, 0x6c, 0x58, 0x51, 0x07, 0x2c, 0xa5,
+	0xa1, 0xea, 0x67, 0xd3, 0x65, 0xea, 0x6e, 0x03, 0x24, 0xd9, 0x70, 0xc2, 0xc2, 0xe0, 0x09, 0x9d,
+	0xd9, 0x3b, 0xd9, 0xf4, 0x72, 0x4f, 0x78, 0x85, 0x27, 0xbc, 0x3e, 0x9f, 0xe1, 0x66, 0x8e, 0x7b,
+	0x48, 0x67, 0xff, 0x5f, 0x2a, 0x6a, 0x43, 0x43, 0xd2, 0xaf, 0x32, 0xca, 0x43, 0xda, 0xaa, 0x19,
+	0x40, 0x39, 0x47, 0x3d, 0x70, 0x15, 0x4b, 0x5a, 0x75, 0xa3, 0xe5, 0x9d, 0x79, 0x9e, 0x62, 0x09,
+	0xd6, 0x90, 0xee, 0xf7, 0x2b, 0x50, 0xcf, 0x0d, 0x86, 0xf6, 0xa0, 0x11, 0x53, 0x29, 0x49, 0x64,
+	0x8a, 0x74, 0x5f, 0x5b, 0x45, 0x89, 0x42, 0x08, 0xaa, 0x31, 0x8d, 0x73, 0x1f, 0x36, 0xb1, 0x19,
+	0x6b, 0xf5, 0x8a, 0xc5, 0x54, 0x64, 0x2a, 0x18, 0x53, 0x16, 0x8d, 0x95, 0x29, 0xaf, 0x8a, 0xd7,
+	0x6d, 0xf4, 0xd0, 0x04, 0xd1, 0x00, 0xae, 0xd2, 0xa9, 0xa2, 0x5c, 0x32, 0xc1, 0x03, 0x91, 0x28,
+	0x26, 0xb8, 0x6c, 0xfd, 0xbd, 0xba, 0x60, 0xdb, 0x8d, 0x12, 0xff, 0x65, 0x0e, 0x47, 0x8f, 0xa1,
+	0xc3, 0x05, 0x0f, 0xc2, 0x94, 0x29, 0x16, 0x92, 0x49, 0x30, 0x87, 0xf0, 0xca, 0x02, 0xc2, 0x6d,
+	0x2e, 0xf8, 0x3d, 0x9b, 0xfb, 0xd9, 0x2b, 0xdc, 0xdd, 0x1f, 0x1d, 0x68, 0x14, 0x3f, 0x11, 0xfa,
+	0x14, 0xd6, 0xb4, 0x71, 0x69, 0x6a, 0x1c, 0x58, 0x9c, 0xce, 0xb5, 0x39, 0xe7, 0x7a, 0x64, 0x60,
+	0xe6, 0xcf, 0xbb, 0x24, 0xcb, 0xb1, 0xd4, 0x17, 0x72, 0x42, 0xa9, 0x35, 0xc7, 0xbc, 0x0b, 0xb9,
+	0x4f, 0x29, 0xd6, 0x90, 0xe2, 0xea, 0xdc, 0xe5, 0x57, 0xf7, 0x83, 0x03, 0x70, 0xbe, 0xdf, 0x2b,
+	0x36, 0x74, 0xde, 0xcc, 0x86, 0x77, 0xa1, 0x19, 0x8b, 0x11, 0x5d, 0xd6, 0x4e, 0x1e, 0x89, 0x11,
+	0xcd, 0xdb, 0x49, 0x6c, 0x47, 0x2f, 0xd9, 0xcf, 0x7d, 0xd9, 0x7e, 0xdd, 0x17, 0x2b, 0xd0, 0x28,
+	0x52, 0xd0, 0x47, 0x50, 0x97, 0x8c, 0x47, 0x13, 0x6a, 0x35, 0x75, 0x17, 0xf0, 0x7b, 0x47, 0x06,
+	0x79, 0x58, 0xc1, 0x36, 0x07, 0x7d, 0x00, 0x35, 0xd3, 0xb6, 0xad, 0xb8, 0x77, 0x17, 0x25, 0x3f,
+	0xd2, 0xc0, 0xc3, 0x0a, 0xce, 0x33, 0xda, 0x7d, 0xa8, 0xe7, 0x74, 0xe8, 0x0e, 0x54, 0xb5, 0x6e,
+	0x23, 0xe0, 0xf2, 0xfe, 0x8d, 0x0b, 0x1c, 0x45, 0x23, 0xbf, 0x78, 0x7f, 0x9a, 0x0f, 0x9b, 0x84,
+	0xf6, 0x53, 0x07, 0x6a, 0x86, 0x15, 0x3d, 0x84, 0xc6, 0x90, 0x29, 0x92, 0xa6, 0xa4, 0x38, 0x5b,
+	0xbf, 0xa0, 0xc9, 0x9f, 0x1b, 0xaf, 0x7c, 0x5d, 0x0a, 0xae, 0x7b, 0x22, 0x4e, 0x48, 0xa8, 0x06,
+	0x4c, 0xf5, 0x75, 0x1a, 0x2e, 0x09, 0xd0, 0x87, 0x00, 0xe5, 0xa9, 0xeb, 0x56, 0xe6, 0x2e, 0x3b,
+	0xf6, 0x66, 0x71, 0xec, 0x72, 0x50, 0x03, 0x57, 0x66, 0x71, 0xf7, 0x4f, 0x07, 0xdc, 0xfb, 0x94,
+	0xa2, 0x10, 0xea, 0x24, 0xd6, 0x5d, 0xc1, 0x9a, 0xb2, 0x7c, 0x40, 0xf4, 0xab, 0x76, 0x41, 0x0a,
+	0xe3, 0x83, 0xbd, 0x67, 0xbf, 0x5f, 0xaf, 0xfc, 0xf4, 0xc7, 0xf5, 0x5e, 0xc4, 0xd4, 0x38, 0x1b,
+	0x7a, 0xa1, 0x88, 0xfd, 0xe2, 0xc5, 0x34, 0x9f, 0x5d, 0x39, 0x7a, 0xe2, 0xab, 0x59, 0x42, 0xa5,
+	0x49, 0x90, 0xd8, 0x52, 0xa3, 0x6d, 0x68, 0x46, 0x44, 0x06, 0x13, 0x16, 0x33, 0x65, 0x2e, 0xa2,
+	0x8a, 0x1b, 0x11, 0x91, 0x9f, 0xeb, 0x39, 0xf2, 0xa0, 0x96, 0x90, 0x19, 0x4d, 0xf3, 0x36, 0x36,
+	0x68, 0xfd, 0xfa, 0xf3, 0xee, 0xa6, 0xd5, 0xd0, 0x1f, 0x8d, 0x52, 0x2a, 0xe5, 0x91, 0x4a, 0x19,
+	0x8f, 0x70, 0x0e, 0x43, 0xfb, 0xb0, 0x1a, 0xa5, 0x84, 0x2b, 0xdb, 0xd7, 0x16, 0x65, 0x14, 0xc0,
+	0x6e, 0x02, 0xee, 0x31, 0x4b, 0xd0, 0x9d, 0x37, 0x2f, 0xb6, 0xaa, 0x8b, 0x2d, 0x0b, 0xd8, 0x83,
+	0xba, 0x62, 0x49, 0x42, 0xd3, 0xbc, 0x55, 0x2d, 0xd8, 0xd2, 0xe2, 0xba, 0xbf, 0x38, 0xb0, 0xde,
+	0xcf, 0xa6, 0xf9, 0xff, 0x75, 0x40, 0x14, 0xd1, 0xba, 0x49, 0x0e, 0x35, 0x06, 0x58, 0xa8, 0xdb,
+	0x02, 0xd1, 0xc7, 0xd0, 0xd0, 0x0e, 0x0b, 0x46, 0x22, 0xb4, 0x06, 0xbe, 0xf1, 0x9a, 0xa6, 0x71,
+	0xf1, 0xc1, 0xc1, 0xab, 0xd2, 0xbe, 0x8b, 0x85, 0x71, 0xdd, 0xff, 0x68, 0x5c, 0xb4, 0x01, 0xae,
+	0x64, 0x91, 0x39, 0xe0, 0x35, 0xac, 0x87, 0x83, 0x4f, 0x9e, 0x9d, 0x76, 0x9c, 0xe7, 0xa7, 0x1d,
+	0xe7, 0xc5, 0x69, 0xc7, 0x79, 0x7a, 0xd6, 0xa9, 0x3c, 0x3f, 0xeb, 0x54, 0x7e, 0x3b, 0xeb, 0x54,
+	0x1e, 0xdf, 0x5c, 0xee, 0x07, 0x5f, 0x4d, 0x87, 0x75, 0xd3, 0x43, 0x6e, 0xff, 0x13, 0x00, 0x00,
+	0xff, 0xff, 0x83, 0x68, 0x7c, 0x6c, 0xab, 0x09, 0x00, 0x00,
 }
 
 func (m *Tx) Marshal() (dAtA []byte, err error) {
@@ -1756,12 +1767,12 @@ func (m *AuxSignerData) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		copy(dAtA[i:], m.Sig)
 		i = encodeVarintTx(dAtA, i, uint64(len(m.Sig)))
 		i--
-		dAtA[i] = 0x1a
+		dAtA[i] = 0x22
 	}
 	if m.Mode != 0 {
 		i = encodeVarintTx(dAtA, i, uint64(m.Mode))
 		i--
-		dAtA[i] = 0x10
+		dAtA[i] = 0x18
 	}
 	if m.SignDoc != nil {
 		{
@@ -1773,6 +1784,13 @@ func (m *AuxSignerData) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 			i = encodeVarintTx(dAtA, i, uint64(size))
 		}
 		i--
+		dAtA[i] = 0x12
+	}
+	if len(m.Address) > 0 {
+		i -= len(m.Address)
+		copy(dAtA[i:], m.Address)
+		i = encodeVarintTx(dAtA, i, uint64(len(m.Address)))
+		i--
 		dAtA[i] = 0xa
 	}
 	return len(dAtA) - i, nil
@@ -2085,6 +2103,10 @@ func (m *AuxSignerData) Size() (n int) {
 	}
 	var l int
 	_ = l
+	l = len(m.Address)
+	if l > 0 {
+		n += 1 + l + sovTx(uint64(l))
+	}
 	if m.SignDoc != nil {
 		l = m.SignDoc.Size()
 		n += 1 + l + sovTx(uint64(l))
@@ -3926,6 +3948,38 @@ func (m *AuxSignerData) Unmarshal(dAtA []byte) error {
 		}
 		switch fieldNum {
 		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Address", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowTx
+				}
+				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 ErrInvalidLengthTx
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthTx
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Address = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
 			if wireType != 2 {
 				return fmt.Errorf("proto: wrong wireType = %d for field SignDoc", wireType)
 			}
@@ -3961,7 +4015,7 @@ func (m *AuxSignerData) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
-		case 2:
+		case 3:
 			if wireType != 0 {
 				return fmt.Errorf("proto: wrong wireType = %d for field Mode", wireType)
 			}
@@ -3980,7 +4034,7 @@ func (m *AuxSignerData) Unmarshal(dAtA []byte) error {
 					break
 				}
 			}
-		case 3:
+		case 4:
 			if wireType != 2 {
 				return fmt.Errorf("proto: wrong wireType = %d for field Sig", wireType)
 			}
diff --git a/x/auth/tx/aux_test.go b/x/auth/tx/aux_test.go
index 83347ab282ce..72774712b3ce 100644
--- a/x/auth/tx/aux_test.go
+++ b/x/auth/tx/aux_test.go
@@ -37,6 +37,7 @@ func TestBuilderWithAux(t *testing.T) {
 
 	// Create an AuxTxBuilder for tipper (1st signer)
 	tipperBuilder := clienttx.NewAuxTxBuilder()
+	tipperBuilder.SetAddress(tipperAddr.String())
 	tipperBuilder.SetAccountNumber(1)
 	tipperBuilder.SetSequence(2)
 	tipperBuilder.SetTimeoutHeight(3)
@@ -57,6 +58,7 @@ func TestBuilderWithAux(t *testing.T) {
 
 	// Create an AuxTxBuilder for aux2 (2nd signer)
 	aux2Builder := clienttx.NewAuxTxBuilder()
+	aux2Builder.SetAddress(aux2Addr.String())
 	aux2Builder.SetAccountNumber(11)
 	aux2Builder.SetSequence(12)
 	aux2Builder.SetTimeoutHeight(3)
diff --git a/x/auth/tx/builder.go b/x/auth/tx/builder.go
index 7c1b09543465..91e3546c74d7 100644
--- a/x/auth/tx/builder.go
+++ b/x/auth/tx/builder.go
@@ -407,17 +407,13 @@ func (w *wrapper) AddAuxSignerData(data tx.AuxSignerData) error {
 
 	// Get the aux signer's index in GetSigners.
 	signerIndex := -1
-	pk, ok := data.SignDoc.PublicKey.GetCachedValue().(cryptotypes.PubKey)
-	if !ok {
-		return sdkerrors.ErrInvalidType.Wrapf("expected %T, got %T", (cryptotypes.PubKey)(nil), pk)
-	}
 	for i, signer := range w.GetSigners() {
-		if signer.Equals(sdk.AccAddress(pk.Address())) {
+		if signer.String() == data.Address {
 			signerIndex = i
 		}
 	}
 	if signerIndex < 0 {
-		return sdkerrors.ErrLogic.Wrapf("address %s is not a signer", sdk.AccAddress(pk.Address()))
+		return sdkerrors.ErrLogic.Wrapf("address %s is not a signer", data.Address)
 	}
 
 	w.setSignerInfoAtIndex(signerIndex, &tx.SignerInfo{