Minecraft wiki entry for Building_a_metropolis, associated text: Bank People go here to store their money. Have a trusted person work there and have vaults deep underground to store their gold and diamonds (you can also use dried kelp blocks to represent banknote or money stacks). Only let the trusted person and the owner of the vault into it. You can use piston doors on the vaults that need a special "key" (Lever) Variation: Use /blockdata ~ ~-1 ~ {Lock:keyname} when standing on a chest. Then, give a player an item named 'keyname' or whatever you typed in the command.