How can I protect private items in chests in vanilla Minecraft 1.12?

I am running a 1.12 Minecraft Realms server, playing Survival Multiplayer, and there are quite a few players playing on it. The problem is that I sometimes encounter a player stealing other player's items from chests.

My goal is to prevent this form happening by somehow blocking the chest inventory from some players.

The problem is: How can I do this? Is there even a way to protect a player's chest from other players?

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2 Answers

I too have a realm and what you could possibly do is turn keepinventory on if It isn’t already and just give players loads of skulker boxes which they can use to store items instead of placed chests. Sadly, i can’t find a way to make chests invincible and locked without plugins or mods so this might be the way to go. Sorry if this wasn’t the answer you were looking for.

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You can lock chests with {Lock:"Key Name"} and if you have a item with that name, you can open the chest when right clicking it with the named item.

/blockdata ~ ~-1 ~ {Lock:"Key Name"}