diff --git a/config.yml b/config.yml
index c052dcda..fa1b35a2 100644
--- a/config.yml
+++ b/config.yml
@@ -92,6 +92,7 @@ genesis:
 validators:
 - name: alice
   bonded: 5000000ubpf
+  home: "~/.cardchaind"
   app:
     api:
       address: 0.0.0.0:1317
diff --git a/x/cardchain/keeper/msg_server_change_alias.go b/x/cardchain/keeper/msg_server_change_alias.go
index b1e5ed1e..bf99884f 100644
--- a/x/cardchain/keeper/msg_server_change_alias.go
+++ b/x/cardchain/keeper/msg_server_change_alias.go
@@ -15,6 +15,11 @@ func (k msgServer) ChangeAlias(goCtx context.Context, msg *types.MsgChangeAlias)
 		return nil, err
 	}
 	
+	err = checkAliasLimit(msg.Alias)
+	if err != nil {
+		return nil, err
+	}
+
 	user.Alias = msg.Alias
 	
 	k.SetUserFromUser(ctx, user)
diff --git a/x/cardchain/keeper/user.go b/x/cardchain/keeper/user.go
index c8c87f12..9342c002 100644
--- a/x/cardchain/keeper/user.go
+++ b/x/cardchain/keeper/user.go
@@ -6,6 +6,8 @@ import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
+const MAX_ALIAS_LEN = 25
+
 // User Combines types.User and it's account address for better usability
 type User struct {
 	types.User
@@ -33,9 +35,13 @@ func (k Keeper) InitUser(ctx sdk.Context, address sdk.AccAddress, alias string)
 		alias = "newbie"
 	}
 	newUser := types.NewUser()
+	err := checkAliasLimit(alias)
+	if err != nil {
+		return err
+	}
 	newUser.Alias = alias
 	newUser.Cards = k.GetAllStarterCards(ctx)
-	err := k.MintCoinsToAddr(ctx, address, sdk.Coins{sdk.NewInt64Coin("ucredits", 10000000000)})
+	err = k.MintCoinsToAddr(ctx, address, sdk.Coins{sdk.NewInt64Coin("ucredits", 10000000000)})
 	if err != nil {
 		return err
 	}
@@ -107,7 +113,15 @@ func (k Keeper) GetAllUsers(ctx sdk.Context) (allUsers []*types.User, allAddress
 		k.cdc.MustUnmarshal(iterator.Value(), &gottenUser)
 
 		allUsers = append(allUsers, &gottenUser)
-		allAddresses = append(allAddresses, sdk.AccAddress(iterator.Key()))
+		allAddresses = append(allAddresses, iterator.Key())
 	}
 	return
 }
+
+func checkAliasLimit(alias string) error {
+	if len(alias) > MAX_ALIAS_LEN {
+		return sdkerrors.Wrapf(types.InvalidAlias, "alias is too long (%d) maximum is %d", len(alias), MAX_ALIAS_LEN)
+	}
+
+	return nil
+}
diff --git a/x/cardchain/types/errors.go b/x/cardchain/types/errors.go
index 9fc28315..b2ed8664 100644
--- a/x/cardchain/types/errors.go
+++ b/x/cardchain/types/errors.go
@@ -33,4 +33,5 @@ var (
 	ErrWaitingForPlayers      = sdkerrors.Register(ModuleName, 23, "Waiting for players")
 	ErrUninitializedType      = sdkerrors.Register(ModuleName, 24, "Type not yet initialized")
 	ErrFinalizeSet            = sdkerrors.Register(ModuleName, 25, "Set can't be finalized")
+	InvalidAlias              = sdkerrors.Register(ModuleName, 26, "Invalid alias")
 )