diff --git a/x/lifecycle-hooks/types/codec.go b/x/lifecycle-hooks/types/codec.go
index 844157a..8217e0d 100644
--- a/x/lifecycle-hooks/types/codec.go
+++ b/x/lifecycle-hooks/types/codec.go
@@ -3,6 +3,9 @@ package types
 import (
 	"github.com/cosmos/cosmos-sdk/codec"
 	cdctypes "github.com/cosmos/cosmos-sdk/codec/types"
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	govtypes "github.com/cosmos/cosmos-sdk/x/gov/types/v1beta1"
+
 	// this line is used by starport scaffolding # 1
 	"github.com/cosmos/cosmos-sdk/types/msgservice"
 )
@@ -13,6 +16,16 @@ func RegisterCodec(cdc *codec.LegacyAmino) {
 
 func RegisterInterfaces(registry cdctypes.InterfaceRegistry) {
 	// this line is used by starport scaffolding # 3
+	registry.RegisterImplementations((*sdk.Msg)(nil),
+		&MsgFundExistentContract{},
+	)
+
+	registry.RegisterImplementations((*govtypes.Content)(nil),
+		&MsgUpdateParamsProposal{},
+		&MsgRegisterContractProposal{},
+		&MsgModifyContractProposal{},
+		&MsgRemoveContractProposal{},
+	)
 
 	msgservice.RegisterMsgServiceDesc(registry, &_Msg_serviceDesc)
 }
diff --git a/x/lifecycle-hooks/types/gov.go b/x/lifecycle-hooks/types/gov.go
index 69cb31f..746551d 100644
--- a/x/lifecycle-hooks/types/gov.go
+++ b/x/lifecycle-hooks/types/gov.go
@@ -17,6 +17,11 @@ var (
 	_ govtypes.Content = &MsgRegisterContractProposal{}
 	_ govtypes.Content = &MsgModifyContractProposal{}
 	_ govtypes.Content = &MsgRemoveContractProposal{}
+
+	_ sdk.Msg = &MsgUpdateParamsProposal{}
+	_ sdk.Msg = &MsgRegisterContractProposal{}
+	_ sdk.Msg = &MsgModifyContractProposal{}
+	_ sdk.Msg = &MsgRemoveContractProposal{}
 )
 
 func init() {
@@ -43,6 +48,16 @@ func NewMsgCreateAllianceProposal(
 		},
 	}
 }
+func (m MsgUpdateParamsProposal) GetSignBytes() []byte {
+	return sdk.MustSortJSON(ModuleCdc.MustMarshalJSON(&m))
+}
+func (m MsgUpdateParamsProposal) GetSigners() []sdk.AccAddress {
+	signer, err := sdk.AccAddressFromBech32(m.Authority)
+	if err != nil {
+		panic(ErrorInvalidSigner)
+	}
+	return []sdk.AccAddress{signer}
+}
 func (m *MsgUpdateParamsProposal) ProposalRoute() string { return RouterKey }
 func (m *MsgUpdateParamsProposal) ProposalType() string  { return UpdateParamsProposalType }
 func (m *MsgUpdateParamsProposal) ValidateBasic() error {
@@ -78,6 +93,16 @@ func NewMsgRegisterContractProposal(
 		ExecutionBlocksFrequency: executionBlocksFrequency,
 	}
 }
+func (m MsgRegisterContractProposal) GetSignBytes() []byte {
+	return sdk.MustSortJSON(ModuleCdc.MustMarshalJSON(&m))
+}
+func (m MsgRegisterContractProposal) GetSigners() []sdk.AccAddress {
+	signer, err := sdk.AccAddressFromBech32(m.Authority)
+	if err != nil {
+		panic(ErrorInvalidSigner)
+	}
+	return []sdk.AccAddress{signer}
+}
 func (m *MsgRegisterContractProposal) ProposalRoute() string { return RouterKey }
 func (m *MsgRegisterContractProposal) ProposalType() string  { return UpdateParamsProposalType }
 func (m *MsgRegisterContractProposal) ValidateBasic() error {
@@ -112,6 +137,16 @@ func NewMsgModifyContractProposal(
 		ExecutionBlocksFrequency: executionBlocksFrequency,
 	}
 }
+func (m MsgModifyContractProposal) GetSignBytes() []byte {
+	return sdk.MustSortJSON(ModuleCdc.MustMarshalJSON(&m))
+}
+func (m MsgModifyContractProposal) GetSigners() []sdk.AccAddress {
+	signer, err := sdk.AccAddressFromBech32(m.Authority)
+	if err != nil {
+		panic(ErrorInvalidSigner)
+	}
+	return []sdk.AccAddress{signer}
+}
 func (m *MsgModifyContractProposal) ProposalRoute() string { return RouterKey }
 func (m *MsgModifyContractProposal) ProposalType() string  { return UpdateParamsProposalType }
 func (m *MsgModifyContractProposal) ValidateBasic() error {
@@ -143,6 +178,16 @@ func NewMsgRemoveContractProposal(
 		DepositRefundAccount: depositRefundAccount,
 	}
 }
+func (m MsgRemoveContractProposal) GetSignBytes() []byte {
+	return sdk.MustSortJSON(ModuleCdc.MustMarshalJSON(&m))
+}
+func (m MsgRemoveContractProposal) GetSigners() []sdk.AccAddress {
+	signer, err := sdk.AccAddressFromBech32(m.Authority)
+	if err != nil {
+		panic(ErrorInvalidSigner)
+	}
+	return []sdk.AccAddress{signer}
+}
 func (m *MsgRemoveContractProposal) ProposalRoute() string { return RouterKey }
 func (m *MsgRemoveContractProposal) ProposalType() string  { return UpdateParamsProposalType }
 func (m *MsgRemoveContractProposal) ValidateBasic() error {