Nice but you can bypass the protection by using a hopper on the bottom :O
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[16:34:35 WARN]: java.io.IOException: Server returned HTTP response code: 525 for URL: https://www.francescoferrara.it/api/betterprivatechest.json
[16:34:35 WARN]: at java.base/sun.net. www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:2027)
[16:34:35 WARN]: at java.base/sun.net. www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1618)
[16:34:35 WARN]: at java.base/sun.net. www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:223)
[16:34:35 WARN]: at betterprivatechest-1.2.7.jar//dev.francies.betterPrivateChest.BetterPrivateChest.checkForUpdates(BetterPrivateChest.java:110)
[16:34:35 WARN]: at betterprivatechest-1.2.7.jar//dev.francies.betterPrivateChest.listeners.PlayerLoginListener.lambda$onPlayerJoin$0(PlayerLoginListener.java:24)
[16:34:35 WARN]: at org.bukkit.craftbukkit.scheduler.CraftTask.run(CraftTask.java:78)
[16:34:35 WARN]: at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:474)
[16:34:35 WARN]: at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1659)
[16:34:35 WARN]: at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1529)
[16:34:35 WARN]: at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1251)
[16:34:35 WARN]: at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:310)
[16:34:35 WARN]: at java.base/java.lang.Thread.run(Thread.java:1583)

please in config
update: false
add

Very simple plugin is functional to allow users of your server to make their chests private, it also offers the possibility to add more people to the same private chest to share it with friends.