diff --git a/app/app.go b/app/app.go
index 946ea821dd..b1264420b8 100644
--- a/app/app.go
+++ b/app/app.go
@@ -1106,7 +1106,7 @@ func (app *App) setAnteHandler(txConfig client.TxConfig, maxGasWanted uint64, bl
 
 		blockedMap[addr.String()] = struct{}{}
 	}
-	blockAddressDecorator := NewBlockAddressesDecorator(blockedMap)
+	blockAddressDecorator := NewBlockAddressesDecorator(blockedMap, app.CronosKeeper.GetParams)
 	options := evmante.HandlerOptions{
 		AccountKeeper:          app.AccountKeeper,
 		BankKeeper:             app.BankKeeper,
diff --git a/app/block_address.go b/app/block_address.go
index 4fc3e4cfd1..76e41ce8d8 100644
--- a/app/block_address.go
+++ b/app/block_address.go
@@ -3,18 +3,26 @@ package app
 import (
 	"fmt"
 
+	"cosmossdk.io/errors"
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 	"github.com/cosmos/cosmos-sdk/x/auth/signing"
+	"github.com/crypto-org-chain/cronos/v2/x/cronos/types"
 )
 
 // BlockAddressesDecorator block addresses from sending transactions
 type BlockAddressesDecorator struct {
 	blockedMap map[string]struct{}
+	getParams  func(ctx sdk.Context) types.Params
 }
 
-func NewBlockAddressesDecorator(blacklist map[string]struct{}) BlockAddressesDecorator {
+func NewBlockAddressesDecorator(
+	blacklist map[string]struct{},
+	getParams func(ctx sdk.Context) types.Params,
+) BlockAddressesDecorator {
 	return BlockAddressesDecorator{
 		blockedMap: blacklist,
+		getParams:  getParams,
 	}
 }
 
@@ -31,6 +39,14 @@ func (bad BlockAddressesDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simula
 				}
 			}
 		}
+		admin := bad.getParams(ctx).CronosAdmin
+		for _, msg := range tx.GetMsgs() {
+			if blocklistMsg, ok := msg.(*types.MsgStoreBlockList); ok {
+				if admin != blocklistMsg.From {
+					return ctx, errors.Wrap(sdkerrors.ErrUnauthorized, "msg sender is not authorized")
+				}
+			}
+		}
 	}
 	return next(ctx, tx, simulate)
 }
diff --git a/x/cronos/types/messages.go b/x/cronos/types/messages.go
index aa78cc110a..5b342e4070 100644
--- a/x/cronos/types/messages.go
+++ b/x/cronos/types/messages.go
@@ -191,8 +191,6 @@ func NewMsgStoreBlockList(from string, blob []byte) *MsgStoreBlockList {
 
 var errDummyIdentity = stderrors.New("dummy")
 
-const MaximumBlobLength = 20480
-
 type dummyIdentity struct{}
 
 func (i *dummyIdentity) Unwrap(stanzas []*age.Stanza) ([]byte, error) {
@@ -200,10 +198,6 @@ func (i *dummyIdentity) Unwrap(stanzas []*age.Stanza) ([]byte, error) {
 }
 
 func (msg *MsgStoreBlockList) ValidateBasic() error {
-	length := len(msg.Blob)
-	if length > MaximumBlobLength {
-		return errors.Wrapf(sdkerrors.ErrInvalidRequest, "block length %d must not exceed %d", length, MaximumBlobLength)
-	}
 	_, err := sdk.AccAddressFromBech32(msg.From)
 	if err != nil {
 		return errors.Wrapf(sdkerrors.ErrInvalidAddress, "invalid sender address (%s)", err)
diff --git a/x/cronos/types/messages_test.go b/x/cronos/types/messages_test.go
index 93a06cdd60..ac2265daa1 100644
--- a/x/cronos/types/messages_test.go
+++ b/x/cronos/types/messages_test.go
@@ -84,16 +84,6 @@ func TestValidateMsgStoreBlockList(t *testing.T) {
 			false,
 			"",
 		},
-		{
-			"blob exceeds maximum length",
-			types.NewMsgStoreBlockList(
-				from,
-				make([]byte, types.MaximumBlobLength+1),
-			),
-			false,
-			true,
-			fmt.Sprintf("must not exceed %d", types.MaximumBlobLength),
-		},
 		{
 			"invalid sender address",
 			types.NewMsgStoreBlockList("invalid", blob),