HardSet

HardSet plays like a hardcore world with one life, locked to the Hard difficulty, and it shuts down the usual ways players fudge a run. A separate, small encrypted record of the world is kept by the mod, stored outside the world folder. Each save extends a tamper-resistant hash chain, in the Bitcoin style, so the history of the world cannot be silently rewound or forged. When a record is deleted or rewritten, the world is flagged, and a CHEATED screen marks any world that has been rolled back, edited or played with the mod switched off.

Commands such as creative, cheats, loading a backup, undo and death are blocked for HardSet worlds, and opening a world to LAN with cheats allowed is refused. Restoring an old backup to undo a death leaves a trace, because the outside record still says the player was alive. Taking the mod out and putting it back later is also caught, since the mod comes back knowing what happened. The mod is for streamers, YouTubers and challenge runners who want a hardcore world their audience can trust.

HardSet is a client and server mod for Fabric only, built for 1.21.11. Only Fabric 1.0.0 is published so far, dated 2026-06-09. It is not open source and is released under All rights reserved.