diff --git a/CHANGELOG.md b/CHANGELOG.md
index ea41172cac51..9e3fc88c0c9a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -115,7 +115,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * [\#10748](https://github.com/cosmos/cosmos-sdk/pull/10748) Move legacy `x/gov` api to `v1beta1` directory.
 * [\#10816](https://github.com/cosmos/cosmos-sdk/pull/10816) Reuse blocked addresses from the bank module. No need to pass them to distribution. 
 * [\#10852](https://github.com/cosmos/cosmos-sdk/pull/10852) Move `x/gov/types` to `x/gov/types/v1beta2`.
-* [\#10868](https://github.com/cosmos/cosmos-sdk/pull/10868) The Gov keeper accepts now a mandatory last argument, the ServiceMsgRouter.
+* [\#10868](https://github.com/cosmos/cosmos-sdk/pull/10868), [\#10989](https://github.com/cosmos/cosmos-sdk/pull/10989) The Gov keeper accepts now 2 more mandatory arguments, the ServiceMsgRouter and a maximum proposal metadata length.
 
 ### Client Breaking Changes
 
diff --git a/proto/cosmos/gov/v1beta2/gov.proto b/proto/cosmos/gov/v1beta2/gov.proto
index 41d87fdcd8a5..c021c6823cd5 100644
--- a/proto/cosmos/gov/v1beta2/gov.proto
+++ b/proto/cosmos/gov/v1beta2/gov.proto
@@ -49,6 +49,9 @@ message Proposal {
   repeated cosmos.base.v1beta1.Coin total_deposit     = 7 [(gogoproto.nullable) = false];
   google.protobuf.Timestamp         voting_start_time = 8 [(gogoproto.stdtime) = true];
   google.protobuf.Timestamp         voting_end_time   = 9 [(gogoproto.stdtime) = true];
+
+  // metadata is any arbitrary metadata attached to the proposal.
+  bytes metadata = 10;
 }
 
 // ProposalStatus enumerates the valid statuses of a proposal.
diff --git a/proto/cosmos/gov/v1beta2/tx.proto b/proto/cosmos/gov/v1beta2/tx.proto
index 4aaa68fc241f..97a818ba793a 100644
--- a/proto/cosmos/gov/v1beta2/tx.proto
+++ b/proto/cosmos/gov/v1beta2/tx.proto
@@ -36,6 +36,8 @@ message MsgSubmitProposal {
   repeated google.protobuf.Any messages             = 1;
   repeated cosmos.base.v1beta1.Coin initial_deposit = 2 [(gogoproto.nullable) = false];
   string                            proposer        = 3 [(cosmos_proto.scalar) = "cosmos.AddressString"];
+  // metadata is any arbitrary metadata attached to the proposal.
+  bytes metadata = 4;
 }
 
 // MsgSubmitProposalResponse defines the Msg/SubmitProposal response type.
diff --git a/simapp/app.go b/simapp/app.go
index ab5cf1ef4bcb..dd7127c098f5 100644
--- a/simapp/app.go
+++ b/simapp/app.go
@@ -302,9 +302,10 @@ func NewSimApp(
 		AddRoute(paramproposal.RouterKey, params.NewParamChangeProposalHandler(app.ParamsKeeper)).
 		AddRoute(distrtypes.RouterKey, distr.NewCommunityPoolSpendProposalHandler(app.DistrKeeper)).
 		AddRoute(upgradetypes.RouterKey, upgrade.NewSoftwareUpgradeProposalHandler(app.UpgradeKeeper))
+	govMaxMetadataLen := uint64(10000)
 	govKeeper := govkeeper.NewKeeper(
 		appCodec, keys[govtypes.StoreKey], app.GetSubspace(govtypes.ModuleName), app.AccountKeeper, app.BankKeeper,
-		&stakingKeeper, govRouter, app.msgSvcRouter,
+		&stakingKeeper, govRouter, app.msgSvcRouter, govMaxMetadataLen,
 	)
 
 	app.GovKeeper = *govKeeper.SetHooks(
diff --git a/x/auth/middleware/tips_test.go b/x/auth/middleware/tips_test.go
index 7169fbf76f09..2bd6a97276cf 100644
--- a/x/auth/middleware/tips_test.go
+++ b/x/auth/middleware/tips_test.go
@@ -33,7 +33,7 @@ func (s *MWTestSuite) setupAcctsForTips(ctx sdk.Context) (sdk.Context, []testAcc
 	s.Require().NoError(err)
 
 	// Create dummy proposal for tipper to vote on.
-	prop, err := govtypes.NewProposal([]sdk.Msg{banktypes.NewMsgSend(accts[0].acc.GetAddress(), accts[0].acc.GetAddress(), initialRegens)}, 1, time.Now(), time.Now().Add(time.Hour))
+	prop, err := govtypes.NewProposal([]sdk.Msg{banktypes.NewMsgSend(accts[0].acc.GetAddress(), accts[0].acc.GetAddress(), initialRegens)}, 1, nil, time.Now(), time.Now().Add(time.Hour))
 	s.Require().NoError(err)
 	s.app.GovKeeper.SetProposal(ctx, prop)
 	s.app.GovKeeper.ActivateVotingPeriod(ctx, prop)
diff --git a/x/gov/abci_test.go b/x/gov/abci_test.go
index 9b14f1a6455f..1f9765f1a7f1 100644
--- a/x/gov/abci_test.go
+++ b/x/gov/abci_test.go
@@ -37,6 +37,7 @@ func TestTickExpiredDepositPeriod(t *testing.T) {
 		[]sdk.Msg{mkTestLegacyContent(t)},
 		sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 5)},
 		addrs[0].String(),
+		nil,
 	)
 	require.NoError(t, err)
 
@@ -89,6 +90,7 @@ func TestTickMultipleExpiredDepositPeriod(t *testing.T) {
 		[]sdk.Msg{mkTestLegacyContent(t)},
 		sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 5)},
 		addrs[0].String(),
+		nil,
 	)
 	require.NoError(t, err)
 
@@ -112,6 +114,7 @@ func TestTickMultipleExpiredDepositPeriod(t *testing.T) {
 		[]sdk.Msg{mkTestLegacyContent(t)},
 		sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 5)},
 		addrs[0].String(),
+		nil,
 	)
 	require.NoError(t, err)
 
@@ -169,6 +172,7 @@ func TestTickPassedDepositPeriod(t *testing.T) {
 		[]sdk.Msg{mkTestLegacyContent(t)},
 		sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 5)},
 		addrs[0].String(),
+		nil,
 	)
 	require.NoError(t, err)
 
@@ -221,7 +225,7 @@ func TestTickPassedVotingPeriod(t *testing.T) {
 	activeQueue.Close()
 
 	proposalCoins := sdk.Coins{sdk.NewCoin(sdk.DefaultBondDenom, app.StakingKeeper.TokensFromConsensusPower(ctx, 5))}
-	newProposalMsg, err := v1beta2.NewMsgSubmitProposal([]sdk.Msg{mkTestLegacyContent(t)}, proposalCoins, addrs[0].String())
+	newProposalMsg, err := v1beta2.NewMsgSubmitProposal([]sdk.Msg{mkTestLegacyContent(t)}, proposalCoins, addrs[0].String(), nil)
 	require.NoError(t, err)
 
 	wrapCtx := sdk.WrapSDKContext(ctx)
@@ -289,7 +293,7 @@ func TestProposalPassedEndblocker(t *testing.T) {
 	require.NotNil(t, macc)
 	initialModuleAccCoins := app.BankKeeper.GetAllBalances(ctx, macc.GetAddress())
 
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, []sdk.Msg{mkTestLegacyContent(t)})
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, []sdk.Msg{mkTestLegacyContent(t)}, nil)
 	require.NoError(t, err)
 
 	proposalCoins := sdk.Coins{sdk.NewCoin(sdk.DefaultBondDenom, app.StakingKeeper.TokensFromConsensusPower(ctx, 10))}
@@ -339,7 +343,7 @@ func TestEndBlockerProposalHandlerFailed(t *testing.T) {
 	// Create a proposal where the handler will pass for the test proposal
 	// because the value of contextKeyBadProposal is true.
 	ctx = ctx.WithValue(contextKeyBadProposal, true)
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, []sdk.Msg{mkTestLegacyContent(t)})
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, []sdk.Msg{mkTestLegacyContent(t)}, nil)
 	require.NoError(t, err)
 
 	proposalCoins := sdk.NewCoins(sdk.NewCoin(sdk.DefaultBondDenom, app.StakingKeeper.TokensFromConsensusPower(ctx, 10)))
diff --git a/x/gov/client/utils/query.go b/x/gov/client/utils/query.go
index 29cf0fb2f77d..97eecfae8154 100644
--- a/x/gov/client/utils/query.go
+++ b/x/gov/client/utils/query.go
@@ -56,7 +56,7 @@ func QueryDepositsByTxQuery(clientCtx client.Context, params v1beta2.QueryPropos
 		clientCtx, defaultPage,
 		// Query legacy Msgs event action
 		[]string{
-			fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta2.TypeMsgDeposit),
+			fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta1.TypeMsgDeposit),
 			fmt.Sprintf("%s.%s='%d'", types.EventTypeProposalDeposit, types.AttributeKeyProposalID, params.ProposalID),
 		},
 		// Query proto Msgs event action v1beta1
@@ -119,7 +119,7 @@ func QueryVotesByTxQuery(clientCtx client.Context, params v1beta2.QueryProposalV
 			clientCtx, nextTxPage,
 			// Query legacy Vote Msgs
 			[]string{
-				fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta2.TypeMsgVote),
+				fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta1.TypeMsgVote),
 				fmt.Sprintf("%s.%s='%d'", types.EventTypeProposalVote, types.AttributeKeyProposalID, params.ProposalID),
 			},
 			// Query Vote proto Msgs v1beta1
@@ -134,7 +134,7 @@ func QueryVotesByTxQuery(clientCtx client.Context, params v1beta2.QueryProposalV
 			},
 			// Query legacy VoteWeighted Msgs
 			[]string{
-				fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta2.TypeMsgVoteWeighted),
+				fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta1.TypeMsgVoteWeighted),
 				fmt.Sprintf("%s.%s='%d'", types.EventTypeProposalVote, types.AttributeKeyProposalID, params.ProposalID),
 			},
 			// Query VoteWeighted proto Msgs v1beta1
@@ -210,7 +210,7 @@ func QueryVoteByTxQuery(clientCtx client.Context, params v1beta2.QueryVoteParams
 		clientCtx, defaultPage,
 		// Query legacy Vote Msgs
 		[]string{
-			fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta2.TypeMsgVote),
+			fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta1.TypeMsgVote),
 			fmt.Sprintf("%s.%s='%d'", types.EventTypeProposalVote, types.AttributeKeyProposalID, params.ProposalID),
 			fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeySender, params.Voter),
 		},
@@ -228,7 +228,7 @@ func QueryVoteByTxQuery(clientCtx client.Context, params v1beta2.QueryVoteParams
 		},
 		// Query legacy VoteWeighted Msgs
 		[]string{
-			fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta2.TypeMsgVoteWeighted),
+			fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta1.TypeMsgVoteWeighted),
 			fmt.Sprintf("%s.%s='%d'", types.EventTypeProposalVote, types.AttributeKeyProposalID, params.ProposalID),
 			fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeySender, params.Voter.String()),
 		},
@@ -318,7 +318,7 @@ func QueryDepositByTxQuery(clientCtx client.Context, params v1beta2.QueryDeposit
 		clientCtx, defaultPage,
 		// Query legacy Msgs event action
 		[]string{
-			fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta2.TypeMsgDeposit),
+			fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta1.TypeMsgDeposit),
 			fmt.Sprintf("%s.%s='%d'", types.EventTypeProposalDeposit, types.AttributeKeyProposalID, params.ProposalID),
 			fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeySender, params.Depositor.String()),
 		},
@@ -385,7 +385,7 @@ func QueryProposerByTxQuery(clientCtx client.Context, proposalID uint64) (Propos
 		defaultPage,
 		// Query legacy Msgs event action
 		[]string{
-			fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta2.TypeMsgSubmitProposal),
+			fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta1.TypeMsgSubmitProposal),
 			fmt.Sprintf("%s.%s='%d'", types.EventTypeSubmitProposal, types.AttributeKeyProposalID, proposalID),
 		},
 		// Query proto Msgs event action v1beta1
@@ -463,7 +463,7 @@ func queryInitialDepositByTxQuery(clientCtx client.Context, proposalID uint64) (
 		clientCtx, defaultPage,
 		// Query legacy Msgs event action
 		[]string{
-			fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta2.TypeMsgSubmitProposal),
+			fmt.Sprintf("%s.%s='%s'", sdk.EventTypeMessage, sdk.AttributeKeyAction, v1beta1.TypeMsgSubmitProposal),
 			fmt.Sprintf("%s.%s='%d'", types.EventTypeSubmitProposal, types.AttributeKeyProposalID, proposalID),
 		},
 		// Query proto Msgs event action v1beta1
diff --git a/x/gov/genesis_test.go b/x/gov/genesis_test.go
index 2ef487a64910..206698ef3984 100644
--- a/x/gov/genesis_test.go
+++ b/x/gov/genesis_test.go
@@ -35,11 +35,11 @@ func TestImportExportQueues(t *testing.T) {
 
 	ctx = app.BaseApp.NewContext(false, tmproto.Header{})
 	// Create two proposals, put the second into the voting period
-	proposal1, err := app.GovKeeper.SubmitProposal(ctx, []sdk.Msg{mkTestLegacyContent(t)})
+	proposal1, err := app.GovKeeper.SubmitProposal(ctx, []sdk.Msg{mkTestLegacyContent(t)}, nil)
 	require.NoError(t, err)
 	proposalID1 := proposal1.ProposalId
 
-	proposal2, err := app.GovKeeper.SubmitProposal(ctx, []sdk.Msg{mkTestLegacyContent(t)})
+	proposal2, err := app.GovKeeper.SubmitProposal(ctx, []sdk.Msg{mkTestLegacyContent(t)}, nil)
 	require.NoError(t, err)
 	proposalID2 := proposal2.ProposalId
 
diff --git a/x/gov/keeper/deposit_test.go b/x/gov/keeper/deposit_test.go
index 5b35f2a24141..9d0cee1cb18f 100644
--- a/x/gov/keeper/deposit_test.go
+++ b/x/gov/keeper/deposit_test.go
@@ -17,7 +17,7 @@ func TestDeposits(t *testing.T) {
 	TestAddrs := simapp.AddTestAddrsIncremental(app, ctx, 2, sdk.NewInt(10000000))
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 
@@ -101,7 +101,7 @@ func TestDeposits(t *testing.T) {
 	require.Equal(t, addr1Initial, app.BankKeeper.GetAllBalances(ctx, TestAddrs[1]))
 
 	// Test delete and burn deposits
-	proposal, err = app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err = app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID = proposal.ProposalId
 	_, err = app.GovKeeper.AddDeposit(ctx, proposalID, TestAddrs[0], fourStake)
diff --git a/x/gov/keeper/grpc_query_test.go b/x/gov/keeper/grpc_query_test.go
index 5143cf1ea105..0b6088c92f0f 100644
--- a/x/gov/keeper/grpc_query_test.go
+++ b/x/gov/keeper/grpc_query_test.go
@@ -52,7 +52,7 @@ func (suite *KeeperTestSuite) TestGRPCQueryProposal() {
 				testProposal := v1beta1.NewTextProposal("Proposal", "testing proposal")
 				msgContent, err := v1beta2.NewLegacyContent(testProposal, govAcct.String())
 				suite.Require().NoError(err)
-				submittedProposal, err := app.GovKeeper.SubmitProposal(ctx, []sdk.Msg{msgContent})
+				submittedProposal, err := app.GovKeeper.SubmitProposal(ctx, []sdk.Msg{msgContent}, nil)
 				suite.Require().NoError(err)
 				suite.Require().NotEmpty(submittedProposal)
 
@@ -116,7 +116,7 @@ func (suite *KeeperTestSuite) TestGRPCQueryProposals() {
 					testProposal := []sdk.Msg{
 						v1beta2.NewMsgVote(govAddress, uint64(i), v1beta2.OptionYes),
 					}
-					proposal, err := app.GovKeeper.SubmitProposal(ctx, testProposal)
+					proposal, err := app.GovKeeper.SubmitProposal(ctx, testProposal, nil)
 					suite.Require().NotEmpty(proposal)
 					suite.Require().NoError(err)
 					testProposals = append(testProposals, &proposal)
@@ -291,7 +291,7 @@ func (suite *KeeperTestSuite) TestGRPCQueryVote() {
 			"no votes present",
 			func() {
 				var err error
-				proposal, err = app.GovKeeper.SubmitProposal(ctx, TestProposal)
+				proposal, err = app.GovKeeper.SubmitProposal(ctx, TestProposal, nil)
 				suite.Require().NoError(err)
 
 				req = &v1beta2.QueryVoteRequest{
@@ -396,7 +396,7 @@ func (suite *KeeperTestSuite) TestGRPCQueryVotes() {
 			"create a proposal and get votes",
 			func() {
 				var err error
-				proposal, err = app.GovKeeper.SubmitProposal(ctx, TestProposal)
+				proposal, err = app.GovKeeper.SubmitProposal(ctx, TestProposal, nil)
 				suite.Require().NoError(err)
 
 				req = &v1beta2.QueryVotesRequest{
@@ -588,7 +588,7 @@ func (suite *KeeperTestSuite) TestGRPCQueryDeposit() {
 			"no deposits proposal",
 			func() {
 				var err error
-				proposal, err = app.GovKeeper.SubmitProposal(ctx, TestProposal)
+				proposal, err = app.GovKeeper.SubmitProposal(ctx, TestProposal, nil)
 				suite.Require().NoError(err)
 				suite.Require().NotNil(proposal)
 
@@ -677,7 +677,7 @@ func (suite *KeeperTestSuite) TestGRPCQueryDeposits() {
 			"create a proposal and get deposits",
 			func() {
 				var err error
-				proposal, err = app.GovKeeper.SubmitProposal(ctx, TestProposal)
+				proposal, err = app.GovKeeper.SubmitProposal(ctx, TestProposal, nil)
 				suite.Require().NoError(err)
 
 				req = &v1beta2.QueryDepositsRequest{
@@ -769,7 +769,7 @@ func (suite *KeeperTestSuite) TestGRPCQueryTally() {
 			"create a proposal and get tally",
 			func() {
 				var err error
-				proposal, err = app.GovKeeper.SubmitProposal(ctx, TestProposal)
+				proposal, err = app.GovKeeper.SubmitProposal(ctx, TestProposal, nil)
 				suite.Require().NoError(err)
 				suite.Require().NotNil(proposal)
 
diff --git a/x/gov/keeper/hooks_test.go b/x/gov/keeper/hooks_test.go
index b8b056a47732..c2553702fbfa 100644
--- a/x/gov/keeper/hooks_test.go
+++ b/x/gov/keeper/hooks_test.go
@@ -64,7 +64,7 @@ func TestHooks(t *testing.T) {
 	require.False(t, govHooksReceiver.AfterProposalVotingPeriodEndedValid)
 
 	tp := TestProposal
-	_, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	_, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	require.True(t, govHooksReceiver.AfterProposalSubmissionValid)
 
@@ -75,7 +75,7 @@ func TestHooks(t *testing.T) {
 
 	require.True(t, govHooksReceiver.AfterProposalFailedMinDepositValid)
 
-	p2, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	p2, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 
 	activated, err := app.GovKeeper.AddDeposit(ctx, p2.ProposalId, addrs[0], minDeposit)
diff --git a/x/gov/keeper/keeper.go b/x/gov/keeper/keeper.go
index 895df2070ac0..1d0c20cfd44b 100644
--- a/x/gov/keeper/keeper.go
+++ b/x/gov/keeper/keeper.go
@@ -41,6 +41,9 @@ type Keeper struct {
 
 	// Msg server router
 	router *middleware.MsgServiceRouter
+
+	// maxMetadataLen defines the maximum proposal metadata length.
+	maxMetadataLen uint64
 }
 
 // NewKeeper returns a governance keeper. It handles:
@@ -54,6 +57,7 @@ func NewKeeper(
 	cdc codec.BinaryCodec, key storetypes.StoreKey, paramSpace types.ParamSubspace,
 	authKeeper types.AccountKeeper, bankKeeper types.BankKeeper, sk types.StakingKeeper,
 	legacyRouter v1beta1.Router, router *middleware.MsgServiceRouter,
+	maxMetadataLen uint64,
 ) Keeper {
 
 	// ensure governance module account is set
@@ -67,14 +71,15 @@ func NewKeeper(
 	legacyRouter.Seal()
 
 	return Keeper{
-		storeKey:     key,
-		paramSpace:   paramSpace,
-		authKeeper:   authKeeper,
-		bankKeeper:   bankKeeper,
-		sk:           sk,
-		cdc:          cdc,
-		legacyRouter: legacyRouter,
-		router:       router,
+		storeKey:       key,
+		paramSpace:     paramSpace,
+		authKeeper:     authKeeper,
+		bankKeeper:     bankKeeper,
+		sk:             sk,
+		cdc:            cdc,
+		legacyRouter:   legacyRouter,
+		router:         router,
+		maxMetadataLen: maxMetadataLen,
 	}
 }
 
diff --git a/x/gov/keeper/keeper_test.go b/x/gov/keeper/keeper_test.go
index 1f455813597a..51b1f82d2631 100644
--- a/x/gov/keeper/keeper_test.go
+++ b/x/gov/keeper/keeper_test.go
@@ -51,17 +51,17 @@ func TestIncrementProposalNumber(t *testing.T) {
 	ctx := app.BaseApp.NewContext(false, tmproto.Header{})
 
 	tp := TestProposal
-	_, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	_, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
-	_, err = app.GovKeeper.SubmitProposal(ctx, tp)
+	_, err = app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
-	_, err = app.GovKeeper.SubmitProposal(ctx, tp)
+	_, err = app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
-	_, err = app.GovKeeper.SubmitProposal(ctx, tp)
+	_, err = app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
-	_, err = app.GovKeeper.SubmitProposal(ctx, tp)
+	_, err = app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
-	proposal6, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal6, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 
 	require.Equal(t, uint64(6), proposal6.ProposalId)
@@ -73,7 +73,7 @@ func TestProposalQueues(t *testing.T) {
 
 	// create test proposals
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 
 	inactiveIterator := app.GovKeeper.InactiveProposalQueueIterator(ctx, *proposal.DepositEndTime)
diff --git a/x/gov/keeper/msg_server.go b/x/gov/keeper/msg_server.go
index fc6fd126be74..577d09fb6f4e 100644
--- a/x/gov/keeper/msg_server.go
+++ b/x/gov/keeper/msg_server.go
@@ -36,7 +36,7 @@ func (k msgServer) SubmitProposal(goCtx context.Context, msg *v1beta2.MsgSubmitP
 		return nil, err
 	}
 
-	proposal, err := k.Keeper.SubmitProposal(ctx, proposalMsgs)
+	proposal, err := k.Keeper.SubmitProposal(ctx, proposalMsgs, msg.Metadata)
 	if err != nil {
 		return nil, err
 	}
@@ -230,6 +230,7 @@ func (k legacyMsgServer) SubmitProposal(goCtx context.Context, msg *v1beta1.MsgS
 		[]sdk.Msg{contentMsg},
 		msg.InitialDeposit,
 		msg.Proposer,
+		nil,
 	)
 	if err != nil {
 		return nil, err
diff --git a/x/gov/keeper/proposal.go b/x/gov/keeper/proposal.go
index bc5cffdf598c..4c630736c559 100644
--- a/x/gov/keeper/proposal.go
+++ b/x/gov/keeper/proposal.go
@@ -11,7 +11,11 @@ import (
 )
 
 // SubmitProposal create new proposal given an array of messages
-func (keeper Keeper) SubmitProposal(ctx sdk.Context, messages []sdk.Msg) (v1beta2.Proposal, error) {
+func (keeper Keeper) SubmitProposal(ctx sdk.Context, messages []sdk.Msg, metadata []byte) (v1beta2.Proposal, error) {
+	if metadata != nil && len(metadata) > int(keeper.maxMetadataLen) {
+		return v1beta2.Proposal{}, types.ErrMetadataTooLong.Wrapf("got metadata with length %d", len(metadata))
+	}
+
 	// Will hold a comma-separated string of all Msg type URLs.
 	msgsStr := ""
 
@@ -63,7 +67,7 @@ func (keeper Keeper) SubmitProposal(ctx sdk.Context, messages []sdk.Msg) (v1beta
 	submitTime := ctx.BlockHeader().Time
 	depositPeriod := keeper.GetDepositParams(ctx).MaxDepositPeriod
 
-	proposal, err := v1beta2.NewProposal(messages, proposalID, submitTime, submitTime.Add(*depositPeriod))
+	proposal, err := v1beta2.NewProposal(messages, proposalID, metadata, submitTime, submitTime.Add(*depositPeriod))
 	if err != nil {
 		return v1beta2.Proposal{}, err
 	}
diff --git a/x/gov/keeper/proposal_test.go b/x/gov/keeper/proposal_test.go
index 82d12e3150c7..dde5829f8469 100644
--- a/x/gov/keeper/proposal_test.go
+++ b/x/gov/keeper/proposal_test.go
@@ -1,6 +1,7 @@
 package keeper_test
 
 import (
+	"bytes"
 	"errors"
 	"fmt"
 	"strings"
@@ -18,7 +19,7 @@ import (
 
 func (suite *KeeperTestSuite) TestGetSetProposal() {
 	tp := TestProposal
-	proposal, err := suite.app.GovKeeper.SubmitProposal(suite.ctx, tp)
+	proposal, err := suite.app.GovKeeper.SubmitProposal(suite.ctx, tp, nil)
 	suite.Require().NoError(err)
 	proposalID := proposal.ProposalId
 	suite.app.GovKeeper.SetProposal(suite.ctx, proposal)
@@ -30,7 +31,7 @@ func (suite *KeeperTestSuite) TestGetSetProposal() {
 
 func (suite *KeeperTestSuite) TestActivateVotingPeriod() {
 	tp := TestProposal
-	proposal, err := suite.app.GovKeeper.SubmitProposal(suite.ctx, tp)
+	proposal, err := suite.app.GovKeeper.SubmitProposal(suite.ctx, tp, nil)
 	suite.Require().NoError(err)
 
 	suite.Require().Nil(proposal.VotingStartTime)
@@ -56,28 +57,32 @@ func (invalidProposalRoute) ProposalRoute() string { return "nonexistingroute" }
 func (suite *KeeperTestSuite) TestSubmitProposal() {
 	govAcct := suite.app.GovKeeper.GetGovernanceAccount(suite.ctx).GetAddress().String()
 	_, _, randomAddr := testdata.KeyTestPubAddr()
+	tp := v1beta1.TextProposal{Title: "title", Description: "description"}
 
 	testCases := []struct {
 		content     v1beta1.Content
 		authority   string
+		metadata    []byte
 		expectedErr error
 	}{
-		{&v1beta1.TextProposal{Title: "title", Description: "description"}, govAcct, nil},
+		{&tp, govAcct, nil, nil},
 		// Keeper does not check the validity of title and description, no error
-		{&v1beta1.TextProposal{Title: "", Description: "description"}, govAcct, nil},
-		{&v1beta1.TextProposal{Title: strings.Repeat("1234567890", 100), Description: "description"}, govAcct, nil},
-		{&v1beta1.TextProposal{Title: "title", Description: ""}, govAcct, nil},
-		{&v1beta1.TextProposal{Title: "title", Description: strings.Repeat("1234567890", 1000)}, govAcct, nil},
+		{&v1beta1.TextProposal{Title: "", Description: "description"}, govAcct, nil, nil},
+		{&v1beta1.TextProposal{Title: strings.Repeat("1234567890", 100), Description: "description"}, govAcct, nil, nil},
+		{&v1beta1.TextProposal{Title: "title", Description: ""}, govAcct, nil, nil},
+		{&v1beta1.TextProposal{Title: "title", Description: strings.Repeat("1234567890", 1000)}, govAcct, nil, nil},
+		// error when metadata is too long (>10000)
+		{&tp, govAcct, bytes.Repeat([]byte{42}, 10001), types.ErrMetadataTooLong},
 		// error when signer is not gov acct
-		{&v1beta1.TextProposal{Title: "title", Description: "description"}, randomAddr.String(), types.ErrInvalidSigner},
+		{&tp, randomAddr.String(), nil, types.ErrInvalidSigner},
 		// error only when invalid route
-		{&invalidProposalRoute{}, govAcct, types.ErrNoProposalHandlerExists},
+		{&invalidProposalRoute{}, govAcct, nil, types.ErrNoProposalHandlerExists},
 	}
 
 	for i, tc := range testCases {
 		prop, err := v1beta2.NewLegacyContent(tc.content, tc.authority)
 		suite.Require().NoError(err)
-		_, err = suite.app.GovKeeper.SubmitProposal(suite.ctx, []sdk.Msg{prop})
+		_, err = suite.app.GovKeeper.SubmitProposal(suite.ctx, []sdk.Msg{prop}, tc.metadata)
 		suite.Require().True(errors.Is(tc.expectedErr, err), "tc #%d; got: %v, expected: %v", i, err, tc.expectedErr)
 	}
 }
@@ -90,7 +95,7 @@ func (suite *KeeperTestSuite) TestGetProposalsFiltered() {
 
 	for _, s := range status {
 		for i := 0; i < 50; i++ {
-			p, err := v1beta2.NewProposal(TestProposal, proposalID, time.Now(), time.Now())
+			p, err := v1beta2.NewProposal(TestProposal, proposalID, nil, time.Now(), time.Now())
 			suite.Require().NoError(err)
 
 			p.Status = s
diff --git a/x/gov/keeper/querier_test.go b/x/gov/keeper/querier_test.go
index 7fd1b268de28..74a99acd620a 100644
--- a/x/gov/keeper/querier_test.go
+++ b/x/gov/keeper/querier_test.go
@@ -161,7 +161,7 @@ func TestQueries(t *testing.T) {
 	depositParams, _, _ := getQueriedParams(t, ctx, legacyQuerierCdc, querier)
 
 	// TestAddrs[0] proposes (and deposits) proposals #1 and #2
-	proposal1, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal1, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	deposit1 := v1beta2.NewDeposit(proposal1.ProposalId, TestAddrs[0], oneCoins)
 	depositer1, err := sdk.AccAddressFromBech32(deposit1.Depositor)
@@ -171,7 +171,7 @@ func TestQueries(t *testing.T) {
 
 	proposal1.TotalDeposit = sdk.NewCoins(proposal1.TotalDeposit...).Add(deposit1.Amount...)
 
-	proposal2, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal2, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	deposit2 := v1beta2.NewDeposit(proposal2.ProposalId, TestAddrs[0], consCoins)
 	depositer2, err := sdk.AccAddressFromBech32(deposit2.Depositor)
@@ -182,7 +182,7 @@ func TestQueries(t *testing.T) {
 	proposal2.TotalDeposit = sdk.NewCoins(proposal2.TotalDeposit...).Add(deposit2.Amount...)
 
 	// TestAddrs[1] proposes (and deposits) on proposal #3
-	proposal3, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal3, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	deposit3 := v1beta2.NewDeposit(proposal3.ProposalId, TestAddrs[1], oneCoins)
 	depositer3, err := sdk.AccAddressFromBech32(deposit3.Depositor)
diff --git a/x/gov/keeper/tally_test.go b/x/gov/keeper/tally_test.go
index b98dd7e1376c..2f9d48618f88 100644
--- a/x/gov/keeper/tally_test.go
+++ b/x/gov/keeper/tally_test.go
@@ -20,7 +20,7 @@ func TestTallyNoOneVotes(t *testing.T) {
 	createValidators(t, ctx, app, []int64{5, 5, 5})
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 	proposal.Status = v1beta2.StatusVotingPeriod
@@ -44,7 +44,7 @@ func TestTallyNoQuorum(t *testing.T) {
 	addrs := simapp.AddTestAddrsIncremental(app, ctx, 1, sdk.NewInt(10000000))
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 	proposal.Status = v1beta2.StatusVotingPeriod
@@ -67,7 +67,7 @@ func TestTallyOnlyValidatorsAllYes(t *testing.T) {
 	addrs, _ := createValidators(t, ctx, app, []int64{5, 5, 5})
 	tp := TestProposal
 
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 	proposal.Status = v1beta2.StatusVotingPeriod
@@ -93,7 +93,7 @@ func TestTallyOnlyValidators51No(t *testing.T) {
 	valAccAddrs, _ := createValidators(t, ctx, app, []int64{5, 6, 0})
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 	proposal.Status = v1beta2.StatusVotingPeriod
@@ -117,7 +117,7 @@ func TestTallyOnlyValidators51Yes(t *testing.T) {
 	valAccAddrs, _ := createValidators(t, ctx, app, []int64{5, 6, 0})
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 	proposal.Status = v1beta2.StatusVotingPeriod
@@ -142,7 +142,7 @@ func TestTallyOnlyValidatorsVetoed(t *testing.T) {
 	valAccAddrs, _ := createValidators(t, ctx, app, []int64{6, 6, 7})
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 	proposal.Status = v1beta2.StatusVotingPeriod
@@ -168,7 +168,7 @@ func TestTallyOnlyValidatorsAbstainPasses(t *testing.T) {
 	valAccAddrs, _ := createValidators(t, ctx, app, []int64{6, 6, 7})
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 	proposal.Status = v1beta2.StatusVotingPeriod
@@ -194,7 +194,7 @@ func TestTallyOnlyValidatorsAbstainFails(t *testing.T) {
 	valAccAddrs, _ := createValidators(t, ctx, app, []int64{6, 6, 7})
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 	proposal.Status = v1beta2.StatusVotingPeriod
@@ -221,7 +221,7 @@ func TestTallyOnlyValidatorsNonVoter(t *testing.T) {
 	valAccAddr1, valAccAddr2 := valAccAddrs[0], valAccAddrs[1]
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 	proposal.Status = v1beta2.StatusVotingPeriod
@@ -255,7 +255,7 @@ func TestTallyDelgatorOverride(t *testing.T) {
 	_ = staking.EndBlocker(ctx, app.StakingKeeper)
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 	proposal.Status = v1beta2.StatusVotingPeriod
@@ -291,7 +291,7 @@ func TestTallyDelgatorInherit(t *testing.T) {
 	_ = staking.EndBlocker(ctx, app.StakingKeeper)
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 	proposal.Status = v1beta2.StatusVotingPeriod
@@ -330,7 +330,7 @@ func TestTallyDelgatorMultipleOverride(t *testing.T) {
 	_ = staking.EndBlocker(ctx, app.StakingKeeper)
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 	proposal.Status = v1beta2.StatusVotingPeriod
@@ -372,7 +372,7 @@ func TestTallyDelgatorMultipleInherit(t *testing.T) {
 	_ = staking.EndBlocker(ctx, app.StakingKeeper)
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 	proposal.Status = v1beta2.StatusVotingPeriod
@@ -415,7 +415,7 @@ func TestTallyJailedValidator(t *testing.T) {
 	app.StakingKeeper.Jail(ctx, sdk.ConsAddress(consAddr.Bytes()))
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 	proposal.Status = v1beta2.StatusVotingPeriod
@@ -448,7 +448,7 @@ func TestTallyValidatorMultipleDelegations(t *testing.T) {
 	require.NoError(t, err)
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 	proposal.Status = v1beta2.StatusVotingPeriod
diff --git a/x/gov/keeper/vote_test.go b/x/gov/keeper/vote_test.go
index 1ca73f64d2e0..2790a3d03a21 100644
--- a/x/gov/keeper/vote_test.go
+++ b/x/gov/keeper/vote_test.go
@@ -18,7 +18,7 @@ func TestVotes(t *testing.T) {
 	addrs := simapp.AddTestAddrsIncremental(app, ctx, 5, sdk.NewInt(30000000))
 
 	tp := TestProposal
-	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp)
+	proposal, err := app.GovKeeper.SubmitProposal(ctx, tp, nil)
 	require.NoError(t, err)
 	proposalID := proposal.ProposalId
 
diff --git a/x/gov/simulation/operations_test.go b/x/gov/simulation/operations_test.go
index 5e39e23c8790..26ef7b04bcc9 100644
--- a/x/gov/simulation/operations_test.go
+++ b/x/gov/simulation/operations_test.go
@@ -147,7 +147,7 @@ func TestSimulateMsgDeposit(t *testing.T) {
 	submitTime := ctx.BlockHeader().Time
 	depositPeriod := app.GovKeeper.GetDepositParams(ctx).MaxDepositPeriod
 
-	proposal, err := v1beta2.NewProposal([]sdk.Msg{contentMsg}, 1, submitTime, submitTime.Add(*depositPeriod))
+	proposal, err := v1beta2.NewProposal([]sdk.Msg{contentMsg}, 1, nil, submitTime, submitTime.Add(*depositPeriod))
 	require.NoError(t, err)
 
 	app.GovKeeper.SetProposal(ctx, proposal)
@@ -191,7 +191,7 @@ func TestSimulateMsgVote(t *testing.T) {
 	submitTime := ctx.BlockHeader().Time
 	depositPeriod := app.GovKeeper.GetDepositParams(ctx).MaxDepositPeriod
 
-	proposal, err := v1beta2.NewProposal([]sdk.Msg{contentMsg}, 1, submitTime, submitTime.Add(*depositPeriod))
+	proposal, err := v1beta2.NewProposal([]sdk.Msg{contentMsg}, 1, nil, submitTime, submitTime.Add(*depositPeriod))
 	require.NoError(t, err)
 
 	app.GovKeeper.ActivateVotingPeriod(ctx, proposal)
@@ -234,7 +234,7 @@ func TestSimulateMsgVoteWeighted(t *testing.T) {
 	submitTime := ctx.BlockHeader().Time
 	depositPeriod := app.GovKeeper.GetDepositParams(ctx).MaxDepositPeriod
 
-	proposal, err := v1beta2.NewProposal([]sdk.Msg{contentMsg}, 1, submitTime, submitTime.Add(*depositPeriod))
+	proposal, err := v1beta2.NewProposal([]sdk.Msg{contentMsg}, 1, nil, submitTime, submitTime.Add(*depositPeriod))
 	require.NoError(t, err)
 
 	app.GovKeeper.ActivateVotingPeriod(ctx, proposal)
diff --git a/x/gov/types/errors.go b/x/gov/types/errors.go
index 18951b0606e2..52cd81648b9d 100644
--- a/x/gov/types/errors.go
+++ b/x/gov/types/errors.go
@@ -20,4 +20,5 @@ var (
 	ErrInvalidProposalMsg      = sdkerrors.Register(ModuleName, 12, "invalid proposal message")
 	ErrInvalidSigner           = sdkerrors.Register(ModuleName, 13, "expected gov account as only signer for proposal message")
 	ErrInvalidSignalMsg        = sdkerrors.Register(ModuleName, 14, "signal message is invalid")
+	ErrMetadataTooLong         = sdkerrors.Register(ModuleName, 15, "metadata too long")
 )
diff --git a/x/gov/types/v1beta2/gov.pb.go b/x/gov/types/v1beta2/gov.pb.go
index 31068577d6ef..98e8b1075805 100644
--- a/x/gov/types/v1beta2/gov.pb.go
+++ b/x/gov/types/v1beta2/gov.pb.go
@@ -246,6 +246,8 @@ type Proposal struct {
 	TotalDeposit     []types.Coin   `protobuf:"bytes,7,rep,name=total_deposit,json=totalDeposit,proto3" json:"total_deposit"`
 	VotingStartTime  *time.Time     `protobuf:"bytes,8,opt,name=voting_start_time,json=votingStartTime,proto3,stdtime" json:"voting_start_time,omitempty"`
 	VotingEndTime    *time.Time     `protobuf:"bytes,9,opt,name=voting_end_time,json=votingEndTime,proto3,stdtime" json:"voting_end_time,omitempty"`
+	// metadata is any arbitrary metadata to attached to the proposal.
+	Metadata []byte `protobuf:"bytes,10,opt,name=metadata,proto3" json:"metadata,omitempty"`
 }
 
 func (m *Proposal) Reset()         { *m = Proposal{} }
@@ -344,6 +346,13 @@ func (m *Proposal) GetVotingEndTime() *time.Time {
 	return nil
 }
 
+func (m *Proposal) GetMetadata() []byte {
+	if m != nil {
+		return m.Metadata
+	}
+	return nil
+}
+
 // TallyResult defines a standard tally for a governance proposal.
 type TallyResult struct {
 	Yes        string `protobuf:"bytes,1,opt,name=yes,proto3" json:"yes,omitempty"`
@@ -671,75 +680,76 @@ func init() {
 func init() { proto.RegisterFile("cosmos/gov/v1beta2/gov.proto", fileDescriptor_5abf7b8852811c49) }
 
 var fileDescriptor_5abf7b8852811c49 = []byte{
-	// 1078 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x8c, 0x56, 0x41, 0x4f, 0x1b, 0x47,
-	0x14, 0x66, 0x6d, 0x63, 0xe0, 0x19, 0x9c, 0xed, 0x40, 0x9b, 0x85, 0x10, 0x9b, 0x5a, 0x6d, 0x84,
-	0x50, 0xb1, 0x81, 0x4a, 0xa9, 0x94, 0x53, 0x6d, 0xbc, 0x69, 0x16, 0x51, 0xd6, 0xdd, 0xdd, 0x18,
-	0xa5, 0x97, 0xd5, 0x9a, 0x9d, 0xd8, 0xab, 0x7a, 0x77, 0xdc, 0x9d, 0x31, 0xc1, 0x3f, 0xa1, 0xb7,
-	0x1c, 0x2b, 0xf5, 0x27, 0xf4, 0x9a, 0x1f, 0x91, 0x53, 0x15, 0x45, 0x8a, 0xd4, 0x5e, 0xdc, 0x16,
-	0x6e, 0xfc, 0x8a, 0x68, 0x67, 0x67, 0xb1, 0xb1, 0x89, 0xe0, 0xc4, 0xf8, 0xbd, 0xef, 0xfb, 0xde,
-	0x7b, 0x33, 0xdf, 0x0c, 0x0b, 0xeb, 0x27, 0x84, 0xfa, 0x84, 0x56, 0xda, 0xe4, 0xb4, 0x72, 0xba,
-	0xdb, 0xc2, 0xcc, 0xd9, 0x8b, 0xd6, 0xe5, 0x5e, 0x48, 0x18, 0x41, 0x28, 0xce, 0x96, 0xa3, 0x88,
-	0xc8, 0xae, 0x15, 0x04, 0xa3, 0xe5, 0x50, 0x2c, 0x28, 0xbb, 0x95, 0x13, 0xe2, 0x05, 0x31, 0x67,
-	0x6d, 0xa5, 0x4d, 0xda, 0x84, 0x2f, 0x2b, 0xd1, 0x4a, 0x44, 0x8b, 0x6d, 0x42, 0xda, 0x5d, 0x5c,
-	0xe1, 0xbf, 0x5a, 0xfd, 0x97, 0x15, 0xe6, 0xf9, 0x98, 0x32, 0xc7, 0xef, 0x09, 0xc0, 0xea, 0x24,
-	0xc0, 0x09, 0x06, 0x22, 0x55, 0x98, 0x4c, 0xb9, 0xfd, 0xd0, 0x61, 0x1e, 0x49, 0x2a, 0xae, 0xc6,
-	0x1d, 0xd9, 0x71, 0x51, 0xd1, 0x32, 0xff, 0x51, 0x62, 0x80, 0x8e, 0xb1, 0xd7, 0xee, 0x30, 0xec,
-	0x36, 0x09, 0xc3, 0x7a, 0x2f, 0xa2, 0xa1, 0xc7, 0x90, 0x25, 0x7c, 0xa5, 0x48, 0x1b, 0xd2, 0x66,
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+	0x45, 0xc8, 0x4d, 0x03, 0xea, 0x6a, 0x53, 0x33, 0x1a, 0xa6, 0xd5, 0x54, 0xf5, 0x86, 0x56, 0x97,
+	0x25, 0xf4, 0x39, 0x3c, 0x9c, 0xc6, 0xb4, 0x34, 0xb3, 0x71, 0xf4, 0x5d, 0x0c, 0x49, 0xa0, 0x0d,
+	0xf8, 0x6c, 0x1a, 0xd2, 0xac, 0x1a, 0x86, 0x5a, 0x8f, 0x9a, 0x9e, 0xce, 0xe9, 0xea, 0x81, 0xba,
+	0x6f, 0xaa, 0x75, 0x39, 0x75, 0x13, 0xf3, 0x69, 0xb5, 0x71, 0xa8, 0xd6, 0xe5, 0xf9, 0xda, 0xc1,
+	0xdb, 0xf3, 0x9c, 0xf4, 0xee, 0x3c, 0x27, 0xfd, 0x7b, 0x9e, 0x93, 0x5e, 0x5f, 0xe4, 0xe6, 0xde,
+	0x5d, 0xe4, 0xe6, 0xfe, 0xba, 0xc8, 0xcd, 0xfd, 0xb8, 0xd3, 0x71, 0x59, 0x77, 0xd0, 0x2e, 0x9f,
+	0x10, 0x4f, 0x7c, 0xb3, 0x88, 0x9f, 0x6d, 0xea, 0xfc, 0x54, 0x39, 0xe3, 0x5f, 0x64, 0x6c, 0xd8,
+	0xc7, 0x34, 0xfe, 0x2e, 0x6b, 0xa7, 0xb9, 0x67, 0xbf, 0xfe, 0x10, 0x00, 0x00, 0xff, 0xff, 0x64,
+	0xbb, 0x92, 0x2d, 0xb4, 0x09, 0x00, 0x00,
 }
 
 func (m *WeightedVoteOption) Marshal() (dAtA []byte, err error) {
@@ -846,6 +856,13 @@ func (m *Proposal) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if len(m.Metadata) > 0 {
+		i -= len(m.Metadata)
+		copy(dAtA[i:], m.Metadata)
+		i = encodeVarintGov(dAtA, i, uint64(len(m.Metadata)))
+		i--
+		dAtA[i] = 0x52
+	}
 	if m.VotingEndTime != nil {
 		n1, err1 := github_com_gogo_protobuf_types.StdTimeMarshalTo(*m.VotingEndTime, dAtA[i-github_com_gogo_protobuf_types.SizeOfStdTime(*m.VotingEndTime):])
 		if err1 != nil {
@@ -1261,6 +1278,10 @@ func (m *Proposal) Size() (n int) {
 		l = github_com_gogo_protobuf_types.SizeOfStdTime(*m.VotingEndTime)
 		n += 1 + l + sovGov(uint64(l))
 	}
+	l = len(m.Metadata)
+	if l > 0 {
+		n += 1 + l + sovGov(uint64(l))
+	}
 	return n
 }
 
@@ -1924,6 +1945,40 @@ func (m *Proposal) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 10:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Metadata", wireType)
+			}
+			var byteLen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGov
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				byteLen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if byteLen < 0 {
+				return ErrInvalidLengthGov
+			}
+			postIndex := iNdEx + byteLen
+			if postIndex < 0 {
+				return ErrInvalidLengthGov
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Metadata = append(m.Metadata[:0], dAtA[iNdEx:postIndex]...)
+			if m.Metadata == nil {
+				m.Metadata = []byte{}
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipGov(dAtA[iNdEx:])
diff --git a/x/gov/types/v1beta2/msgs.go b/x/gov/types/v1beta2/msgs.go
index c228a16881f1..f026c26caacb 100644
--- a/x/gov/types/v1beta2/msgs.go
+++ b/x/gov/types/v1beta2/msgs.go
@@ -11,15 +11,6 @@ import (
 	"github.com/cosmos/cosmos-sdk/x/gov/types/v1beta1"
 )
 
-// Governance message types and routes
-const (
-	TypeMsgDeposit        = "deposit"
-	TypeMsgVote           = "vote"
-	TypeMsgVoteWeighted   = "weighted_vote"
-	TypeMsgSubmitProposal = "submit_proposal"
-	TypeMsgSignal         = "signal"
-)
-
 var (
 	_, _, _, _, _ sdk.Msg                            = &MsgSubmitProposal{}, &MsgDeposit{}, &MsgVote{}, &MsgVoteWeighted{}, &MsgExecLegacyContent{}
 	_, _          codectypes.UnpackInterfacesMessage = &MsgSubmitProposal{}, &MsgExecLegacyContent{}
@@ -27,10 +18,11 @@ var (
 
 // NewMsgSubmitProposal creates a new MsgSubmitProposal.
 //nolint:interfacer
-func NewMsgSubmitProposal(messages []sdk.Msg, initialDeposit sdk.Coins, proposer string) (*MsgSubmitProposal, error) {
+func NewMsgSubmitProposal(messages []sdk.Msg, initialDeposit sdk.Coins, proposer string, metadata []byte) (*MsgSubmitProposal, error) {
 	m := &MsgSubmitProposal{
 		InitialDeposit: initialDeposit,
 		Proposer:       proposer,
+		Metadata:       metadata,
 	}
 
 	anys, err := sdktx.SetMsgs(messages)
@@ -51,7 +43,7 @@ func (m *MsgSubmitProposal) GetMsgs() ([]sdk.Msg, error) {
 func (m MsgSubmitProposal) Route() string { return types.RouterKey }
 
 // Type implements Msg
-func (m MsgSubmitProposal) Type() string { return TypeMsgSubmitProposal }
+func (m MsgSubmitProposal) Type() string { return sdk.MsgTypeURL(&m) }
 
 // ValidateBasic implements Msg
 func (m MsgSubmitProposal) ValidateBasic() error {
@@ -68,11 +60,10 @@ func (m MsgSubmitProposal) ValidateBasic() error {
 		return sdkerrors.Wrap(sdkerrors.ErrInvalidCoins, deposit.String())
 	}
 
-	// Empty messages are not allowed
-	// TODO: ValidateBasic should check that either metadata or length is non nil
-	// if m.Messages == nil || len(m.Messages) == 0 {
-	// 	return ErrNoProposalMsgs
-	// }
+	// Check that either metadata or Msgs length is non nil.
+	if len(m.Messages) == 0 && len(m.Metadata) == 0 {
+		return sdkerrors.Wrap(types.ErrNoProposalMsgs, "either metadata or Msgs length must be non-nil")
+	}
 
 	msgs, err := m.GetMsgs()
 	if err != nil {
@@ -116,7 +107,7 @@ func NewMsgDeposit(depositor sdk.AccAddress, proposalID uint64, amount sdk.Coins
 func (msg MsgDeposit) Route() string { return types.RouterKey }
 
 // Type implements Msg
-func (msg MsgDeposit) Type() string { return TypeMsgDeposit }
+func (msg MsgDeposit) Type() string { return sdk.MsgTypeURL(&msg) }
 
 // ValidateBasic implements Msg
 func (msg MsgDeposit) ValidateBasic() error {
@@ -156,7 +147,7 @@ func NewMsgVote(voter sdk.AccAddress, proposalID uint64, option VoteOption) *Msg
 func (msg MsgVote) Route() string { return types.RouterKey }
 
 // Type implements Msg
-func (msg MsgVote) Type() string { return TypeMsgVote }
+func (msg MsgVote) Type() string { return sdk.MsgTypeURL(&msg) }
 
 // ValidateBasic implements Msg
 func (msg MsgVote) ValidateBasic() error {
@@ -192,7 +183,7 @@ func NewMsgVoteWeighted(voter sdk.AccAddress, proposalID uint64, options Weighte
 func (msg MsgVoteWeighted) Route() string { return types.RouterKey }
 
 // Type implements Msg
-func (msg MsgVoteWeighted) Type() string { return TypeMsgVoteWeighted }
+func (msg MsgVoteWeighted) Type() string { return sdk.MsgTypeURL(&msg) }
 
 // ValidateBasic implements Msg
 func (msg MsgVoteWeighted) ValidateBasic() error {
diff --git a/x/gov/types/v1beta2/msgs_test.go b/x/gov/types/v1beta2/msgs_test.go
index 65ba980ee9f6..5a64426f6356 100644
--- a/x/gov/types/v1beta2/msgs_test.go
+++ b/x/gov/types/v1beta2/msgs_test.go
@@ -6,6 +6,7 @@ import (
 	"github.com/stretchr/testify/require"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/x/gov/types/v1beta1"
 	"github.com/cosmos/cosmos-sdk/x/gov/types/v1beta2"
 )
 
@@ -126,10 +127,46 @@ func TestMsgVoteWeighted(t *testing.T) {
 	}
 }
 
+func TestMsgSubmitProposal_ValidateBasic(t *testing.T) {
+	metadata := []byte{42}
+	// Valid msg
+	msg1, err := v1beta2.NewLegacyContent(v1beta1.NewTextProposal("Title", "description"), addrs[0].String())
+	require.NoError(t, err)
+	// Invalid msg
+	msg2, err := v1beta2.NewLegacyContent(v1beta1.NewTextProposal("Title", "description"), "foo")
+	require.NoError(t, err)
+
+	tests := []struct {
+		name           string
+		proposer       string
+		initialDeposit sdk.Coins
+		messages       []sdk.Msg
+		metadata       []byte
+		expErr         bool
+	}{
+		{"invalid addr", "", coinsPos, []sdk.Msg{msg1}, metadata, true},
+		{"empty msgs and metadata", addrs[0].String(), coinsPos, nil, nil, true},
+		{"invalid msg", addrs[0].String(), coinsPos, []sdk.Msg{msg1, msg2}, metadata, true},
+		{"valid with no Msg", addrs[0].String(), coinsPos, nil, metadata, false},
+		{"valid with no metadata", addrs[0].String(), coinsPos, []sdk.Msg{msg1}, nil, false},
+		{"valid with everything", addrs[0].String(), coinsPos, []sdk.Msg{msg1}, metadata, false},
+	}
+
+	for _, tc := range tests {
+		msg, err := v1beta2.NewMsgSubmitProposal(tc.messages, tc.initialDeposit, tc.proposer, tc.metadata)
+		require.NoError(t, err)
+		if tc.expErr {
+			require.Error(t, msg.ValidateBasic(), "test: %s", tc.name)
+		} else {
+			require.NoError(t, msg.ValidateBasic(), "test: %s", tc.name)
+		}
+	}
+}
+
 // this tests that Amino JSON MsgSubmitProposal.GetSignBytes() still works with Content as Any using the ModuleCdc
 func TestMsgSubmitProposal_GetSignBytes(t *testing.T) {
 	proposal := []sdk.Msg{v1beta2.NewMsgVote(addrs[0], 1, v1beta2.OptionYes)}
-	msg, err := v1beta2.NewMsgSubmitProposal(proposal, sdk.NewCoins(), sdk.AccAddress{}.String())
+	msg, err := v1beta2.NewMsgSubmitProposal(proposal, sdk.NewCoins(), sdk.AccAddress{}.String(), nil)
 	require.NoError(t, err)
 	var bz []byte
 	require.NotPanics(t, func() {
diff --git a/x/gov/types/v1beta2/proposal.go b/x/gov/types/v1beta2/proposal.go
index 22c2cb84c1fd..ebe6076d675c 100644
--- a/x/gov/types/v1beta2/proposal.go
+++ b/x/gov/types/v1beta2/proposal.go
@@ -23,7 +23,7 @@ const (
 )
 
 // NewProposal creates a new Proposal instance
-func NewProposal(messages []sdk.Msg, id uint64, submitTime, depositEndTime time.Time) (Proposal, error) {
+func NewProposal(messages []sdk.Msg, id uint64, metadata []byte, submitTime, depositEndTime time.Time) (Proposal, error) {
 
 	msgs, err := sdktx.SetMsgs(messages)
 	if err != nil {
@@ -35,6 +35,7 @@ func NewProposal(messages []sdk.Msg, id uint64, submitTime, depositEndTime time.
 	p := Proposal{
 		ProposalId:       id,
 		Messages:         msgs,
+		Metadata:         metadata,
 		Status:           StatusDepositPeriod,
 		FinalTallyResult: &tally,
 		SubmitTime:       &submitTime,
diff --git a/x/gov/types/v1beta2/proposals_test.go b/x/gov/types/v1beta2/proposals_test.go
index a49a3e14958e..7525ba5361f6 100644
--- a/x/gov/types/v1beta2/proposals_test.go
+++ b/x/gov/types/v1beta2/proposals_test.go
@@ -37,7 +37,7 @@ func TestNestedAnys(t *testing.T) {
 	testProposal := v1beta1.NewTextProposal("Proposal", "testing proposal")
 	msgContent, err := v1beta2.NewLegacyContent(testProposal, "cosmos1govacct")
 	require.NoError(t, err)
-	proposal, err := v1beta2.NewProposal([]sdk.Msg{msgContent}, 1, time.Now(), time.Now())
+	proposal, err := v1beta2.NewProposal([]sdk.Msg{msgContent}, 1, nil, time.Now(), time.Now())
 	require.NoError(t, err)
 
 	require.Equal(t, "TODO Fix panic here", proposal.String())
diff --git a/x/gov/types/v1beta2/tx.pb.go b/x/gov/types/v1beta2/tx.pb.go
index c2d7b0b9a487..82d5d9d74872 100644
--- a/x/gov/types/v1beta2/tx.pb.go
+++ b/x/gov/types/v1beta2/tx.pb.go
@@ -37,6 +37,8 @@ type MsgSubmitProposal struct {
 	Messages       []*types.Any  `protobuf:"bytes,1,rep,name=messages,proto3" json:"messages,omitempty"`
 	InitialDeposit []types1.Coin `protobuf:"bytes,2,rep,name=initial_deposit,json=initialDeposit,proto3" json:"initial_deposit"`
 	Proposer       string        `protobuf:"bytes,3,opt,name=proposer,proto3" json:"proposer,omitempty"`
+	// metadata is any arbitrary metadata to attached to the proposal.
+	Metadata []byte `protobuf:"bytes,4,opt,name=metadata,proto3" json:"metadata,omitempty"`
 }
 
 func (m *MsgSubmitProposal) Reset()         { *m = MsgSubmitProposal{} }
@@ -93,6 +95,13 @@ func (m *MsgSubmitProposal) GetProposer() string {
 	return ""
 }
 
+func (m *MsgSubmitProposal) GetMetadata() []byte {
+	if m != nil {
+		return m.Metadata
+	}
+	return nil
+}
+
 // MsgSubmitProposalResponse defines the Msg/SubmitProposal response type.
 type MsgSubmitProposalResponse struct {
 	ProposalId uint64 `protobuf:"varint,1,opt,name=proposal_id,json=proposalId,proto3" json:"proposal_id,omitempty"`
@@ -545,50 +554,51 @@ func init() {
 func init() { proto.RegisterFile("cosmos/gov/v1beta2/tx.proto", fileDescriptor_4214261f6b3f9ed4) }
 
 var fileDescriptor_4214261f6b3f9ed4 = []byte{
-	// 681 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xbc, 0x55, 0x4f, 0x4f, 0x13, 0x4f,
-	0x18, 0xee, 0x52, 0x7e, 0x14, 0x5e, 0x7e, 0x81, 0x30, 0x69, 0xe2, 0x76, 0x21, 0x0b, 0x59, 0x23,
-	0x69, 0x62, 0xba, 0x5b, 0xaa, 0xc1, 0x83, 0x1e, 0xa4, 0x68, 0x82, 0xc6, 0x46, 0x5d, 0x12, 0x4d,
-	0xbc, 0xe0, 0xb6, 0x3b, 0x0c, 0x13, 0xe9, 0xbe, 0xeb, 0xce, 0xb4, 0xa1, 0xdf, 0xc2, 0xef, 0xe0,
-	0x07, 0xf0, 0x82, 0x1f, 0xc1, 0x84, 0x78, 0x22, 0x9e, 0xbc, 0x48, 0x0c, 0xdc, 0xfc, 0x14, 0xa6,
-	0xbb, 0xb3, 0x0b, 0xd2, 0x3f, 0xe0, 0xc5, 0x53, 0xa7, 0xef, 0xf3, 0x3c, 0xef, 0x3c, 0xcf, 0x64,
-	0xde, 0x1d, 0x58, 0x6c, 0xa1, 0x68, 0xa3, 0x70, 0x18, 0x76, 0x9d, 0xee, 0x5a, 0x93, 0x4a, 0xaf,
-	0xe6, 0xc8, 0x03, 0x3b, 0x8c, 0x50, 0x22, 0x21, 0x09, 0x68, 0x33, 0xec, 0xda, 0x0a, 0x34, 0x4c,
-	0x25, 0x68, 0x7a, 0x82, 0x2a, 0xc5, 0x9a, 0xd3, 0x42, 0x1e, 0x24, 0x1a, 0x63, 0x69, 0x48, 0xc3,
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 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -851,6 +861,13 @@ func (m *MsgSubmitProposal) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if len(m.Metadata) > 0 {
+		i -= len(m.Metadata)
+		copy(dAtA[i:], m.Metadata)
+		i = encodeVarintTx(dAtA, i, uint64(len(m.Metadata)))
+		i--
+		dAtA[i] = 0x22
+	}
 	if len(m.Proposer) > 0 {
 		i -= len(m.Proposer)
 		copy(dAtA[i:], m.Proposer)
@@ -1222,6 +1239,10 @@ func (m *MsgSubmitProposal) Size() (n int) {
 	if l > 0 {
 		n += 1 + l + sovTx(uint64(l))
 	}
+	l = len(m.Metadata)
+	if l > 0 {
+		n += 1 + l + sovTx(uint64(l))
+	}
 	return n
 }
 
@@ -1488,6 +1509,40 @@ func (m *MsgSubmitProposal) Unmarshal(dAtA []byte) error {
 			}
 			m.Proposer = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
+		case 4:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Metadata", wireType)
+			}
+			var byteLen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowTx
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				byteLen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if byteLen < 0 {
+				return ErrInvalidLengthTx
+			}
+			postIndex := iNdEx + byteLen
+			if postIndex < 0 {
+				return ErrInvalidLengthTx
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Metadata = append(m.Metadata[:0], dAtA[iNdEx:postIndex]...)
+			if m.Metadata == nil {
+				m.Metadata = []byte{}
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipTx(dAtA[iNdEx:])