That One Chest Lock

Initial release.

Rename a trial key in an anvil, point at a trapped chest, /trigger lock. Only a trial key with that same name opens it.

• Lock and unlock trapped chests with /trigger lock and /trigger unlock
• Opening is pure vanilla — the chest's lock field does the work, nothing runs on right-click
• Mined, blown up, or creeper'd chests are restored the next tick with contents intact; the 10-tick item pickup delay means the thief never touches anything
• Hoppers and hopper minecarts directly below a locked chest are removed within a second. Side and top hoppers are push-only and left alone, so input sorters keep working
• Double chests lock and unlock as a unit
• Server-side only. Bedrock players work through Geyser with no client install

Known limitation: a renamed trial key can no longer open a trial chamber vault (MC-268183). A chest key is permanently a chest key.