So i have been on a few minecraft servers recently and i have seen a plugin where you have a chance to get a key and when you do you can click a chest and then get a random reward but if you do not have the key it will not allow you to open the chest and claim the reward i have been on servers where you can donate for these and also get them from voting and i was wandering wether anyone knew what it was called or if it could be coded thanks for the help -Goose