diff --git a/runtime/v2/go.mod b/runtime/v2/go.mod
index e58b4f577a74..9840ca88316a 100644
--- a/runtime/v2/go.mod
+++ b/runtime/v2/go.mod
@@ -50,7 +50,7 @@ require (
 	github.com/cockroachdb/tokenbucket v0.0.0-20230807174530-cc333fc44b06 // indirect
 	github.com/cosmos/cosmos-db v1.0.2 // indirect
 	github.com/cosmos/cosmos-proto v1.0.0-beta.5 // indirect
-	github.com/cosmos/iavl v1.1.4 // indirect
+	github.com/cosmos/iavl v1.2.0 // indirect
 	github.com/cosmos/ics23/go v0.10.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/emicklei/dot v1.6.2 // indirect
diff --git a/runtime/v2/go.sum b/runtime/v2/go.sum
index cf33e39ac964..a3a26f890ba6 100644
--- a/runtime/v2/go.sum
+++ b/runtime/v2/go.sum
@@ -42,8 +42,8 @@ github.com/cosmos/cosmos-proto v1.0.0-beta.5 h1:eNcayDLpip+zVLRLYafhzLvQlSmyab+R
 github.com/cosmos/cosmos-proto v1.0.0-beta.5/go.mod h1:hQGLpiIUloJBMdQMMWb/4wRApmI9hjHH05nefC0Ojec=
 github.com/cosmos/gogoproto v1.4.12 h1:vB6Lbe/rtnYGjQuFxkPiPYiCybqFT8QvLipDZP8JpFE=
 github.com/cosmos/gogoproto v1.4.12/go.mod h1:LnZob1bXRdUoqMMtwYlcR3wjiElmlC+FkjaZRv1/eLY=
-github.com/cosmos/iavl v1.1.4 h1:Z0cVVjeQqOUp78/nWt/uhQy83vYluWlAMGQ4zbH9G34=
-github.com/cosmos/iavl v1.1.4/go.mod h1:vCYmRQUJU1wwj0oRD3wMEtOM9sJNDP+GFMaXmIxZ/rU=
+github.com/cosmos/iavl v1.2.0 h1:kVxTmjTh4k0Dh1VNL046v6BXqKziqMDzxo93oh3kOfM=
+github.com/cosmos/iavl v1.2.0/go.mod h1:HidWWLVAtODJqFD6Hbne2Y0q3SdxByJepHUOeoH4LiI=
 github.com/cosmos/ics23/go v0.10.0 h1:iXqLLgp2Lp+EdpIuwXTYIQU+AiHj9mOC2X9ab++bZDM=
 github.com/cosmos/ics23/go v0.10.0/go.mod h1:ZfJSmng/TBNTBkFemHHHj5YY7VAU/MBU980F4VU1NG0=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
diff --git a/server/mock/tx.go b/server/mock/tx.go
index d8599dbca4af..a9c47fabf50f 100644
--- a/server/mock/tx.go
+++ b/server/mock/tx.go
@@ -4,11 +4,11 @@ import (
 	"bytes"
 	"fmt"
 
-	"google.golang.org/protobuf/proto"
-
 	bankv1beta1 "cosmossdk.io/api/cosmos/bank/v1beta1"
+	"cosmossdk.io/core/transaction"
 	errorsmod "cosmossdk.io/errors"
 	"cosmossdk.io/x/auth/signing"
+	"google.golang.org/protobuf/reflect/protoreflect"
 
 	cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
 	sdk "github.com/cosmos/cosmos-sdk/types"
@@ -103,7 +103,7 @@ func (msg *KVStoreTx) GetGasLimit() (uint64, error) {
 	return 0, nil
 }
 
-func (msg *KVStoreTx) GetMessages() ([]proto.Message, error) {
+func (msg *KVStoreTx) GetMessages() ([]transaction.Msg, error) {
 	return nil, nil
 }
 
@@ -119,8 +119,8 @@ func (msg *KVStoreTx) GetMsgs() []sdk.Msg {
 	return []sdk.Msg{msg}
 }
 
-func (msg *KVStoreTx) GetMsgsV2() ([]proto.Message, error) {
-	return []proto.Message{&bankv1beta1.MsgSend{FromAddress: msg.address.String()}}, nil // this is a hack for tests
+func (msg *KVStoreTx) GetReflectMessages() ([]protoreflect.Message, error) {
+	return []protoreflect.Message{(&bankv1beta1.MsgSend{FromAddress: msg.address.String()}).ProtoReflect()}, nil // this is a hack for tests
 }
 
 func (msg *KVStoreTx) GetSignBytes() []byte {
diff --git a/server/v2/stf/mock/tx.go b/server/v2/stf/mock/tx.go
index 4252f30bce98..1f56edb20290 100644
--- a/server/v2/stf/mock/tx.go
+++ b/server/v2/stf/mock/tx.go
@@ -22,11 +22,11 @@ func (t Tx) Hash() [32]byte {
 	return sha256.Sum256(t.Bytes())
 }
 
-func (t Tx) GetMessages() ([]transaction.Type, error) {
+func (t Tx) GetMessages() ([]transaction.Msg, error) {
 	if t.Msg == nil {
 		return nil, errors.New("messages not available or are nil")
 	}
-	return []transaction.Type{t.Msg}, nil
+	return []transaction.Msg{t.Msg}, nil
 }
 
 func (t Tx) GetSenders() ([]transaction.Identity, error) {
diff --git a/types/mempool/mempool_test.go b/types/mempool/mempool_test.go
index 9d53045e95dd..5c95b3ac0a63 100644
--- a/types/mempool/mempool_test.go
+++ b/types/mempool/mempool_test.go
@@ -12,6 +12,7 @@ import (
 	_ "cosmossdk.io/api/cosmos/counter/v1"
 	_ "cosmossdk.io/api/cosmos/crypto/secp256k1"
 	"cosmossdk.io/core/log"
+	"cosmossdk.io/core/transaction"
 	"cosmossdk.io/x/auth/signing"
 
 	codectestutil "github.com/cosmos/cosmos-sdk/codec/testutil"
@@ -87,7 +88,7 @@ func (tx testTx) GetGasLimit() (uint64, error) {
 	return 0, nil
 }
 
-func (tx testTx) GetMessages() ([]protov2.Message, error) {
+func (tx testTx) GetMessages() ([]transaction.Msg, error) {
 	return nil, nil
 }
 
@@ -121,7 +122,7 @@ func (sigErrTx) GetGasLimit() (uint64, error) {
 	return 0, nil
 }
 
-func (sigErrTx) GetMessages() ([]protov2.Message, error) {
+func (sigErrTx) GetMessages() ([]transaction.Msg, error) {
 	return nil, nil
 }
 
diff --git a/types/mempool/signer_extraction_adapater_test.go b/types/mempool/signer_extraction_adapater_test.go
index 93850fbfea7e..cf09b9fd38a5 100644
--- a/types/mempool/signer_extraction_adapater_test.go
+++ b/types/mempool/signer_extraction_adapater_test.go
@@ -5,6 +5,7 @@ import (
 	"math/rand"
 	"testing"
 
+	"cosmossdk.io/core/transaction"
 	"github.com/stretchr/testify/require"
 	"google.golang.org/protobuf/reflect/protoreflect"
 
@@ -36,7 +37,7 @@ func (n nonVerifiableTx) GetGasLimit() (uint64, error) {
 	return 0, nil
 }
 
-func (n nonVerifiableTx) GetMessages() ([]proto.Message, error) {
+func (n nonVerifiableTx) GetMessages() ([]transaction.Msg, error) {
 	return nil, nil
 }
 
diff --git a/types/tx_msg.go b/types/tx_msg.go
index 6039321758e7..d90de129732e 100644
--- a/types/tx_msg.go
+++ b/types/tx_msg.go
@@ -7,6 +7,7 @@ import (
 
 	"google.golang.org/protobuf/reflect/protoreflect"
 
+	"cosmossdk.io/core/transaction"
 	coretransaction "cosmossdk.io/core/transaction"
 
 	"github.com/cosmos/cosmos-sdk/codec"
@@ -51,6 +52,8 @@ type (
 
 	// Tx defines an interface a transaction must fulfill.
 	Tx interface {
+		transaction.Tx
+
 		HasMsgs
 
 		// GetReflectMessages gets a reflected version of the transaction's messages
diff --git a/x/auth/ante/sigverify.go b/x/auth/ante/sigverify.go
index d4105cedcd5c..27d2a7abce3c 100644
--- a/x/auth/ante/sigverify.go
+++ b/x/auth/ante/sigverify.go
@@ -469,7 +469,7 @@ func (vscd ValidateSigCountDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, _ b
 }
 
 func (vscd ValidateSigCountDecorator) ValidateTx(ctx context.Context, tx sdk.Tx) error {
-	sigTx, ok := tx.(authsigning.SigVerifiableTx) // TODO: what do we do with this.
+	sigTx, ok := tx.(authsigning.SigVerifiableTx)
 	if !ok {
 		return errorsmod.Wrap(sdkerrors.ErrTxDecode, "Tx must be a sigTx")
 	}
diff --git a/x/auth/go.mod b/x/auth/go.mod
index e885489ad08a..f28f22c93365 100644
--- a/x/auth/go.mod
+++ b/x/auth/go.mod
@@ -182,4 +182,5 @@ replace (
 	cosmossdk.io/x/bank => ../bank
 	cosmossdk.io/x/consensus => ../consensus
 	cosmossdk.io/x/staking => ../staking
+	cosmossdk.io/x/tx => ../tx
 )
diff --git a/x/auth/go.sum b/x/auth/go.sum
index 40fc19ed51da..4eba47eb3ae0 100644
--- a/x/auth/go.sum
+++ b/x/auth/go.sum
@@ -12,8 +12,6 @@ cosmossdk.io/store v1.1.1-0.20240418092142-896cdf1971bc h1:R9O9d75e0qZYUsVV0zzi+
 cosmossdk.io/store v1.1.1-0.20240418092142-896cdf1971bc/go.mod h1:amTTatOUV3u1PsKmNb87z6/galCxrRbz9kRdJkL0DyU=
 cosmossdk.io/x/accounts/defaults/lockup v0.0.0-20240417181816-5e7aae0db1f5 h1:eb0kcGyaYHSS0do7+MIWg7UKlskSH01biRNENbm/zDA=
 cosmossdk.io/x/accounts/defaults/lockup v0.0.0-20240417181816-5e7aae0db1f5/go.mod h1:drzY4oVisyWvSgpsM7ccQ7IX3efMuVIvd9Eij1Gm/6o=
-cosmossdk.io/x/tx v0.13.3 h1:Ha4mNaHmxBc6RMun9aKuqul8yHiL78EKJQ8g23Zf73g=
-cosmossdk.io/x/tx v0.13.3/go.mod h1:I8xaHv0rhUdIvIdptKIqzYy27+n2+zBVaxO6fscFhys=
 filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
 filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
 github.com/99designs/go-keychain v0.0.0-20191008050251-8e49817e8af4 h1:/vQbFIOMbk2FiG/kXiLl8BRyzTWDw7gX/Hz7Dd5eDMs=
diff --git a/x/auth/tx/gogotx.go b/x/auth/tx/gogotx.go
index ef1678190787..af6b0601b61d 100644
--- a/x/auth/tx/gogotx.go
+++ b/x/auth/tx/gogotx.go
@@ -8,10 +8,12 @@ import (
 	"strings"
 
 	"github.com/cosmos/gogoproto/proto"
+	"google.golang.org/protobuf/protoadapt"
 	"google.golang.org/protobuf/reflect/protoreflect"
 	"google.golang.org/protobuf/types/known/anypb"
 
 	"cosmossdk.io/core/address"
+	"cosmossdk.io/core/transaction"
 	errorsmod "cosmossdk.io/errors"
 	"cosmossdk.io/math"
 	"cosmossdk.io/x/auth/ante"
@@ -143,11 +145,17 @@ func (w *gogoTxWrapper) GetGasLimit() (uint64, error) {
 	return w.decodedTx.Tx.AuthInfo.Fee.GasLimit, nil
 }
 
-func (w *gogoTxWrapper) GetMessages() ([]protov2.Message, error) {
+func (w *gogoTxWrapper) GetMessages() ([]transaction.Msg, error) {
 	if w.decodedTx == nil || w.decodedTx.Messages == nil {
 		return nil, errors.New("messages not available or are nil")
 	}
-	return w.decodedTx.Messages, nil
+
+	msgs := make([]transaction.Msg, len(w.decodedTx.Messages))
+	for i, msg := range w.decodedTx.Messages {
+		msgs[i] = protoadapt.MessageV1Of(msg)
+	}
+
+	return msgs, nil
 }
 
 func (w *gogoTxWrapper) GetSenders() ([][]byte, error) {
diff --git a/x/tx/decode/decode.go b/x/tx/decode/decode.go
index 77cff820393f..45a1c9ce962e 100644
--- a/x/tx/decode/decode.go
+++ b/x/tx/decode/decode.go
@@ -6,6 +6,7 @@ import (
 
 	"github.com/cosmos/cosmos-proto/anyutil"
 	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/protoadapt"
 
 	v1beta1 "cosmossdk.io/api/cosmos/tx/v1beta1"
 	"cosmossdk.io/core/transaction"
@@ -151,11 +152,17 @@ func (dtx *DecodedTx) GetGasLimit() (uint64, error) {
 	return dtx.Tx.AuthInfo.Fee.GasLimit, nil
 }
 
-func (dtx *DecodedTx) GetMessages() ([]proto.Message, error) {
+func (dtx *DecodedTx) GetMessages() ([]transaction.Msg, error) {
 	if dtx == nil || dtx.Messages == nil {
 		return nil, errors.New("messages not available or are nil")
 	}
-	return dtx.Messages, nil
+
+	msgs := make([]transaction.Msg, len(dtx.Messages))
+	for i, msg := range dtx.Messages {
+		msgs[i] = protoadapt.MessageV1Of(msg)
+	}
+
+	return msgs, nil
 }
 
 func (dtx *DecodedTx) GetSenders() ([][]byte, error) {
diff --git a/x/tx/go.mod b/x/tx/go.mod
index f2209fd299bd..1dad149f5a4d 100644
--- a/x/tx/go.mod
+++ b/x/tx/go.mod
@@ -21,8 +21,7 @@ require (
 )
 
 require (
-	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/kr/text v0.2.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	golang.org/x/exp v0.0.0-20240222234643-814bf88cf225 // indirect
diff --git a/x/tx/go.sum b/x/tx/go.sum
index 17e0fdffc7b1..bbef6e0b475d 100644
--- a/x/tx/go.sum
+++ b/x/tx/go.sum
@@ -1,17 +1,18 @@
-cosmossdk.io/api v0.7.3 h1:V815i8YOwOAQa1rLCsSMjVG5Gnzs02JLq+l7ks8s1jk=
-cosmossdk.io/api v0.7.3/go.mod h1:IcxpYS5fMemZGqyYtErK7OqvdM0C8kdW3dq8Q/XIG38=
+cosmossdk.io/api v0.7.5 h1:eMPTReoNmGUm8DeiQL9DyM8sYDjEhWzL1+nLbI9DqtQ=
+cosmossdk.io/api v0.7.5/go.mod h1:IcxpYS5fMemZGqyYtErK7OqvdM0C8kdW3dq8Q/XIG38=
 cosmossdk.io/errors v1.0.1 h1:bzu+Kcr0kS/1DuPBtUFdWjzLqyUuCiyHjyJB6srBV/0=
 cosmossdk.io/errors v1.0.1/go.mod h1:MeelVSZThMi4bEakzhhhE/CKqVv3nOJDA25bIqRDu/U=
 cosmossdk.io/math v1.3.0 h1:RC+jryuKeytIiictDslBP9i1fhkVm6ZDmZEoNP316zE=
 cosmossdk.io/math v1.3.0/go.mod h1:vnRTxewy+M7BtXBNFybkuhSH4WfedVAAnERHgVFhp3k=
-github.com/cosmos/cosmos-proto v1.0.0-beta.4 h1:aEL7tU/rLOmxZQ9z4i7mzxcLbSCY48OdY7lIWTLG7oU=
-github.com/cosmos/cosmos-proto v1.0.0-beta.4/go.mod h1:oeB+FyVzG3XrQJbJng0EnV8Vljfk9XvTIpGILNU/9Co=
-github.com/cosmos/gogoproto v1.4.11 h1:LZcMHrx4FjUgrqQSWeaGC1v/TeuVFqSLa43CC6aWR2g=
-github.com/cosmos/gogoproto v1.4.11/go.mod h1:/g39Mh8m17X8Q/GDEs5zYTSNaNnInBSohtaxzQnYq1Y=
+github.com/cosmos/cosmos-proto v1.0.0-beta.5 h1:eNcayDLpip+zVLRLYafhzLvQlSmyab+RC5W7ZfmxJLA=
+github.com/cosmos/cosmos-proto v1.0.0-beta.5/go.mod h1:hQGLpiIUloJBMdQMMWb/4wRApmI9hjHH05nefC0Ojec=
+github.com/cosmos/gogoproto v1.4.12 h1:vB6Lbe/rtnYGjQuFxkPiPYiCybqFT8QvLipDZP8JpFE=
+github.com/cosmos/gogoproto v1.4.12/go.mod h1:LnZob1bXRdUoqMMtwYlcR3wjiElmlC+FkjaZRv1/eLY=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/golang/protobuf v1.3.0/go.mod h1:Qd/q+1AKNOZr9uGQzbzCmRO6sUih6GTPZv6a1/R87v0=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=