diff --git a/CHANGELOG.md b/CHANGELOG.md
index 608567f7ec..7ae54078b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,15 @@
 # Changelog
 
-## v0.2.5  
+## v0.2.6-alpha.1
+This release includes 1 new feature.
 
+Features:
+* [#310](https://github.com/bnb-chain/greenfield-cosmos-sdk/pull/310) feat: add FlagPrintEIP712MsgType  
+
+Chores:
+* [#312](https://github.com/bnb-chain/greenfield-cosmos-sdk/pull/312) chore: improve the validations of parameters
+
+## v0.2.5
 This release includes all the changes in the v0.2.5 alpha versions and 1 new feature.
 
 Features:
diff --git a/client/cmd.go b/client/cmd.go
index a3a9215911..adad8f6d40 100644
--- a/client/cmd.go
+++ b/client/cmd.go
@@ -107,6 +107,11 @@ func ReadPersistentCommandFlags(clientCtx Context, flagSet *pflag.FlagSet) (Cont
 		clientCtx = clientCtx.WithSimulation(dryRun)
 	}
 
+	if !clientCtx.Simulate || flagSet.Changed(flags.FlagPrintEIP712MsgType) {
+		printEIP712, _ := flagSet.GetBool(flags.FlagPrintEIP712MsgType)
+		clientCtx = clientCtx.WithSimulation(printEIP712).WithPrintEIP712MsgType(printEIP712)
+	}
+
 	if clientCtx.KeyringDir == "" || flagSet.Changed(flags.FlagKeyringDir) {
 		keyringDir, _ := flagSet.GetString(flags.FlagKeyringDir)
 
diff --git a/client/context.go b/client/context.go
index 12bd7bc420..636bf2efb2 100644
--- a/client/context.go
+++ b/client/context.go
@@ -59,6 +59,8 @@ type Context struct {
 	// IsAux is true when the signer is an auxiliary signer (e.g. the tipper).
 	IsAux bool
 
+	PrintEIP712MsgType bool
+
 	// TODO: Deprecated (remove).
 	LegacyAmino *codec.LegacyAmino
 }
@@ -267,6 +269,12 @@ func (ctx Context) WithAux(isAux bool) Context {
 	return ctx
 }
 
+// WithPrintEIP712MsgType returns a copy of the context with an updated PrintEIP712MsgType value.
+func (ctx Context) WithPrintEIP712MsgType(printEIP712MsgType bool) Context {
+	ctx.PrintEIP712MsgType = printEIP712MsgType
+	return ctx
+}
+
 // WithLedgerHasProto returns the context with the provided boolean value, indicating
 // whether the target Ledger application can support Protobuf payloads.
 func (ctx Context) WithLedgerHasProtobuf(val bool) Context {
@@ -369,7 +377,7 @@ func GetFromFields(clientCtx Context, kr keyring.Keyring, from string) (sdk.AccA
 	switch {
 	case clientCtx.Simulate:
 		if err != nil {
-			return nil, "", 0, fmt.Errorf("a valid bech32 address must be provided in simulation mode: %w", err)
+			return nil, "", 0, fmt.Errorf("a valid hex address must be provided in simulation mode: %w", err)
 		}
 
 		return addr, "", 0, nil
diff --git a/client/context_test.go b/client/context_test.go
index 290003e73e..10c0601f17 100644
--- a/client/context_test.go
+++ b/client/context_test.go
@@ -205,7 +205,7 @@ func TestGetFromFields(t *testing.T) {
 			},
 			from:        "alice",
 			clientCtx:   client.Context{}.WithSimulation(true),
-			expectedErr: "a valid bech32 address must be provided in simulation mode",
+			expectedErr: "a valid hex address must be provided in simulation mode",
 		},
 		{
 			keyring: func() keyring.Keyring {
diff --git a/client/flags/flags.go b/client/flags/flags.go
index 6150e56745..51ce2b07f4 100644
--- a/client/flags/flags.go
+++ b/client/flags/flags.go
@@ -89,6 +89,8 @@ const (
 	// Tendermint logging flags
 	FlagLogLevel  = "log_level"
 	FlagLogFormat = "log_format"
+
+	FlagPrintEIP712MsgType = "print-eip712-msg-type"
 )
 
 // LineBreak can be included in a command list to provide a blank line
@@ -136,6 +138,7 @@ func AddTxFlagsToCmd(cmd *cobra.Command) {
 	// --gas can accept integers and "auto"
 	f.String(FlagGas, "", fmt.Sprintf("gas limit to set per-transaction; set to %q to calculate sufficient gas automatically. Note: %q option doesn't always report accurate results. Set a valid coin value to adjust the result. Can be used instead of %q. (default %d)",
 		GasFlagAuto, GasFlagAuto, FlagFees, DefaultGasLimit))
+	f.Bool(FlagPrintEIP712MsgType, false, "ignore the --gas flag and perform a simulation of a transaction(but don't broadcast it) and print the EIP712 message type")
 
 	AddKeyringFlags(f)
 }
diff --git a/client/tx/factory.go b/client/tx/factory.go
index 05921de381..80bda86574 100644
--- a/client/tx/factory.go
+++ b/client/tx/factory.go
@@ -1,6 +1,8 @@
 package tx
 
 import (
+	"encoding/hex"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"os"
@@ -15,11 +17,14 @@ import (
 	"github.com/cosmos/cosmos-sdk/client/flags"
 	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
 	"github.com/cosmos/cosmos-sdk/crypto/keyring"
-	"github.com/cosmos/cosmos-sdk/crypto/keys/secp256k1"
+	"github.com/cosmos/cosmos-sdk/crypto/keys/eth/ethsecp256k1"
 	cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/types/tx"
 	"github.com/cosmos/cosmos-sdk/types/tx/signing"
+	authsigning "github.com/cosmos/cosmos-sdk/x/auth/signing"
+	authtx "github.com/cosmos/cosmos-sdk/x/auth/tx"
+	"github.com/ethereum/go-ethereum/signer/core/apitypes"
 )
 
 // Factory defines a client transaction factory that facilitates generating and
@@ -80,8 +85,13 @@ func NewFactoryCLI(clientCtx client.Context, flagSet *pflag.FlagSet) (Factory, e
 	memo, _ := flagSet.GetString(flags.FlagNote)
 	timeoutHeight, _ := flagSet.GetUint64(flags.FlagTimeoutHeight)
 
-	gasStr, _ := flagSet.GetString(flags.FlagGas)
-	gasSetting, _ := flags.ParseGasSetting(gasStr)
+	var gasSetting flags.GasSetting
+	dryRun, _ := flagSet.GetBool(flags.FlagDryRun)
+	printEIP712MsgType, _ := flagSet.GetBool(flags.FlagPrintEIP712MsgType)
+	if !dryRun && !printEIP712MsgType {
+		gasStr, _ := flagSet.GetString(flags.FlagGas)
+		gasSetting, _ = flags.ParseGasSetting(gasStr)
+	}
 
 	f := Factory{
 		txConfig:           clientCtx.TxConfig,
@@ -170,7 +180,7 @@ func (f Factory) WithFees(fees string) Factory {
 }
 
 // WithTips returns a copy of the Factory with an updated tip.
-func (f Factory) WithTips(tip string, tipper string) Factory {
+func (f Factory) WithTips(tip, tipper string) Factory {
 	parsedTips, err := sdk.ParseCoinsNormalized(tip)
 	if err != nil {
 		panic(err)
@@ -399,6 +409,73 @@ func (f Factory) PrintUnsignedTx(clientCtx client.Context, msgs ...sdk.Msg) erro
 	return clientCtx.PrintString(fmt.Sprintf("%s\n", json))
 }
 
+func (f Factory) PrintEIP712MsgType(clientCtx client.Context, msgs ...sdk.Msg) error {
+	if len(msgs) != 1 {
+		return errors.New("only one message is supported")
+	}
+
+	unsignedTx, err := f.BuildUnsignedTx(msgs...)
+	if err != nil {
+		return err
+	}
+
+	txRawBytes, err := clientCtx.TxConfig.TxEncoder()(unsignedTx.GetTx())
+	if err != nil {
+		return err
+	}
+	txRawBytesHex := hex.EncodeToString(txRawBytes)
+
+	signerData := authsigning.SignerData{
+		Address: clientCtx.From,
+		ChainID: clientCtx.ChainID,
+	}
+
+	chainID, err := sdk.ParseChainID(clientCtx.ChainID)
+	if err != nil {
+		return fmt.Errorf("failed to parse chainID: %s", err)
+	}
+	msgTypes, signDoc, err := authtx.GetMsgTypes(signerData, unsignedTx.GetTx(), chainID)
+	if err != nil {
+		return fmt.Errorf("failed to get msg types: %s", err)
+	}
+	typedData, err := authtx.WrapTxToTypedData(chainID.Uint64(), signDoc, msgTypes)
+	if err != nil {
+		return fmt.Errorf("failed to wrap tx to typedData: %s", err)
+	}
+
+	eip712MsgTypes := typedData.Types
+	delete(eip712MsgTypes, "Tx")
+	delete(eip712MsgTypes, "Fee")
+	delete(eip712MsgTypes, "Coin")
+	delete(eip712MsgTypes, "EIP712Domain")
+
+	msgData := typedData.Message["msg1"].(map[string]interface{})
+	if msgData == nil {
+		return fmt.Errorf("failed to get msg data")
+	}
+	msgTypeUrl := msgData["type"].(string)
+
+	type EIP712TypedData struct {
+		MsgTypeUrl        string                 `json:"MsgTypeUrl"`
+		EIP712MessageType apitypes.Types         `json:"EIP712MessageType"`
+		MessageData       map[string]interface{} `json:"MessageData"`
+		TxRawBytes        string                 `json:"TxRawBytes"`
+	}
+
+	eip712TypedData := EIP712TypedData{
+		MsgTypeUrl:        msgTypeUrl,
+		EIP712MessageType: eip712MsgTypes,
+		MessageData:       msgData,
+		TxRawBytes:        txRawBytesHex,
+	}
+	bz, err := json.MarshalIndent(eip712TypedData, "", "  ")
+	if err != nil {
+		return err
+	}
+
+	return clientCtx.PrintString(fmt.Sprintf("%s\n", bz))
+}
+
 // BuildSimTx creates an unsigned tx with an empty single signature and returns
 // the encoded transaction or an error if the unsigned transaction cannot be
 // built.
@@ -437,7 +514,7 @@ func (f Factory) BuildSimTx(msgs ...sdk.Msg) ([]byte, error) {
 func (f Factory) getSimPK() (cryptotypes.PubKey, error) {
 	var (
 		ok bool
-		pk cryptotypes.PubKey = &secp256k1.PubKey{} // use default public key type
+		pk cryptotypes.PubKey = &ethsecp256k1.PubKey{} // use default public key type
 	)
 
 	// Use the first element from the list of keys in order to generate a valid
diff --git a/client/tx/tx.go b/client/tx/tx.go
index 0b80419901..4689f481a8 100644
--- a/client/tx/tx.go
+++ b/client/tx/tx.go
@@ -59,6 +59,10 @@ func GenerateOrBroadcastTxWithFactory(clientCtx client.Context, txf Factory, msg
 		return txf.PrintUnsignedTx(clientCtx, msgs...)
 	}
 
+	if clientCtx.PrintEIP712MsgType {
+		return txf.PrintEIP712MsgType(clientCtx, msgs...)
+	}
+
 	return BroadcastTx(clientCtx, txf, msgs...)
 }
 
diff --git a/x/bank/client/cli/tx.go b/x/bank/client/cli/tx.go
index 14b0a952d3..0aec61d1e5 100644
--- a/x/bank/client/cli/tx.go
+++ b/x/bank/client/cli/tx.go
@@ -39,7 +39,7 @@ func NewSendTxCmd() *cobra.Command {
 		Short: "Send funds from one account to another.",
 		Long: `Send funds from one account to another.
 Note, the '--from' flag is ignored as it is implied from [from_key_or_address].
-When using '--dry-run' a key name cannot be used, only a bech32 address.
+When using '--dry-run' a key name cannot be used, only a hex address.
 `,
 		Args: cobra.ExactArgs(3),
 		RunE: func(cmd *cobra.Command, args []string) error {
@@ -80,7 +80,7 @@ func NewMultiSendTxCmd() *cobra.Command {
 By default, sends the [amount] to each address of the list.
 Using the '--split' flag, the [amount] is split equally between the addresses.
 Note, the '--from' flag is ignored as it is implied from [from_key_or_address].
-When using '--dry-run' a key name cannot be used, only a bech32 address.
+When using '--dry-run' a key name cannot be used, only a hex address.
 `,
 		Args: cobra.MinimumNArgs(4),
 		RunE: func(cmd *cobra.Command, args []string) error {
diff --git a/x/gov/keeper/crosschain.go b/x/gov/keeper/crosschain.go
index f82f8e45ea..21bbfdad70 100644
--- a/x/gov/keeper/crosschain.go
+++ b/x/gov/keeper/crosschain.go
@@ -66,13 +66,16 @@ func (k Keeper) SyncParams(ctx sdk.Context, destChainId sdk.ChainID, cpc govv1.C
 		Target: addresses,
 	}
 
-	encodedPackage := pack.MustSerialize()
+	encodedPackage, err := pack.Serialize()
+	if err != nil {
+		return sdkerrors.Wrapf(types.ErrInvalidSyncParamPackage, "fail to serialize, err: %s", err.Error())
+	}
 
 	if !k.crossChainKeeper.IsDestChainSupported(destChainId) {
 		return sdkerrors.Wrapf(types.ErrChainNotSupported, "destination chain (%d) is not supported", destChainId)
 	}
 
-	_, err := k.crossChainKeeper.CreateRawIBCPackageWithFee(
+	_, err = k.crossChainKeeper.CreateRawIBCPackageWithFee(
 		ctx,
 		destChainId,
 		types.SyncParamsChannelID,
diff --git a/x/gov/types/crosschain.go b/x/gov/types/crosschain.go
index 259c0a2e0e..ac63a5c371 100644
--- a/x/gov/types/crosschain.go
+++ b/x/gov/types/crosschain.go
@@ -35,10 +35,10 @@ var (
 	}
 )
 
-func (p SyncParamsPackage) MustSerialize() []byte {
+func (p SyncParamsPackage) Serialize() ([]byte, error) {
 	encodedBytes, err := syncParamsPackageArgs.Pack(&p)
 	if err != nil {
-		panic("encode params change sync package error")
+		return nil, err
 	}
-	return encodedBytes
+	return encodedBytes, nil
 }
diff --git a/x/gov/types/errors.go b/x/gov/types/errors.go
index 71c4ac98b9..248a918d2f 100644
--- a/x/gov/types/errors.go
+++ b/x/gov/types/errors.go
@@ -33,7 +33,7 @@ var (
 	ErrAddressSizeNotMatch     = errors.Register(ModuleName, 25, "number of old address not equal to new addresses")
 	ErrAddressNotValid         = errors.Register(ModuleName, 26, "address format is not valid")
 	ErrExceedParamsChangeLimit = errors.Register(ModuleName, 27, "exceed params change limit")
-	ErrInvalidUpgradeProposal  = errors.Register(ModuleName, 28, "invalid sync params package")
+	ErrInvalidSyncParamPackage = errors.Register(ModuleName, 28, "invalid sync params package")
 	ErrInvalidValue            = errors.Register(ModuleName, 29, "decode hex value failed")
 
 	ErrChainNotSupported = errors.Register(ModuleName, 30, "crosschain: chain is not supported")
diff --git a/x/gov/types/v1/crosschain.go b/x/gov/types/v1/crosschain.go
index 2974c89631..000094576d 100644
--- a/x/gov/types/v1/crosschain.go
+++ b/x/gov/types/v1/crosschain.go
@@ -1,8 +1,10 @@
 package v1
 
 import (
+	"encoding/hex"
 	"strings"
 
+	sdkerrors "cosmossdk.io/errors"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/x/gov/types"
 )
@@ -36,6 +38,11 @@ func (m *CrossChainParamsChange) ValidateBasic() error {
 			if err != nil {
 				return types.ErrAddressNotValid
 			}
+		} else {
+			_, err := hex.DecodeString(value)
+			if err != nil {
+				return sdkerrors.Wrapf(types.ErrInvalidValue, "value is not valid %s", value)
+			}
 		}
 		_, err := sdk.AccAddressFromHexUnsafe(target)
 		if err != nil {