Anarchy Server Duplication Exploits

Since dupes come and go easily, this page will instead be dedicated to showing the most popular past dupes, along with how to identify fake dupes. The fake dupes will be listed after the real dupes.

Vehicle Desync Dupe
This category describes the most popular dupe in anarchy over the last several years. You may know it as the donkey dupe. There are many variations to this dupe, but the goal is the same: To get the vehicle (donkey, mule, llama, or minecart) into an unloaded/lazy chunk, get the items out of the vehicle, and then bring the vehicle back. When the vehicle is brought back, all the items still remain inside, meaning that you now had two copies of one item. Bringing the vehicle into another dimension can also desync the entity, but that will be covered in the next category.

The earliest variant of this dupe was done with a minecart with chest, where a cactus would break the minecart while in an unloaded chunk. The details are not too well known.

The second variant used a hack known as "EntityDesync". The objective was to dismount the entity client side and then move into an unloaded chunk. Then, when the entity is remounted, a ghost entity is remounted instead of the real entity, which appears on the side. The items are taken out of the ghost entity, and the other entity remains with all its items still intact.

The last variant used another hack called "PacketCanceller". The hack came into existence after it was discovered that if players stop sending motion packets, they can still move by minecart hopping and not load chunks. This made is possible to position an entity right outside the render distance and then access it by minecart hopping. A piston would be used to move the entity into unloaded chunks, and the items would be taken out.

Vehicle Dimension Dupe
The objective here was the kill the vehicle while it going through a portal. The first iteration of this exploit involved a cactus which was placed in the nether. A donkey or llama was damaged to one heart and sent through the portal in the overworld, which would instantly kill it as it went through. The items would drop twice, duplicating them. It was later discovered that dropping a donkey through the end portal would also work, and it wouldn't require a cactus because the fall damage would kill the donkey as it entered the end portal.

Chunk Dupe
The chunk dupe was one of the most effective and longest lasting dupes. It involved overloading a chunk with books crammed with unicode characters, which would cause it to fail to save and revert. The objective was to fill the chunk just before that overload limit, and then cram hundreds of shulkers of items in the chunk. The items would be taken out and the chunk would be overloaded, causing the chunk to revert to an earlier save when the player relogged or walked away from the chunk. It was different in its strategy and the fact that players could dupe hundreds of shulkers in one run.

Crafting Dupe
This was a well known dupe in 1.12. It involved spamming the recipe book to duplicate a random item in your inventory. This one allowed for super stacked items (stacked totems, stacked armor, etc), but it didn't last long and many of the items were reset by a plugin.

Logout Dupe
This category covers any type of dupe that involves logging out. The first one was the 11/11 dupe on 2b2t, which was achieved by dropping items and then instantaneously logging out. These types of dupes are confined to specific servers, and there may be plugins which can cause a dupe. The item frame dupe on 9b9t that lasted for a short time was an example of this.

Carpet/Rail Dupe
This dupe is unpatched on many anarchy servers, mainly because of its limited effectiveness. The objective was to connect a slime machine to a redstone clock, causing rails or carpets to be duplicated. The main use of this is to get unlimited furnace fuel when duping carpets.

Now that we've covered the real dupes, it's time to look at some fake dupes.

Bed/Lava Dupe (Fake)
The bed/lava dupe is a dupe that supposedly involves either throwing items in lava or dying in lava. However, it is well known that lava destroys items the moment it touches them, so placing a hopper underneath the lava or logging out wouldn't help. Some players say that the dupe only works for shulker boxes, but it's pretty obvious in those scenarios that they just want you to lose your items. If you still need clarification you can look at the dozens of players that die by lava or throw their items in lava daily. If lava did duplicate items you probably wouldn't be the first to know.

Cactus Dupe (Fake)
This dupe supposedly involves throwing an item at a cactus. A big problem with this is that cactuses, like lava, actually destroy items. There was at one point a dupe with a cactus, but that involves killing an entity in an unloaded chunks. There was never a dupe where someone would throw items at cactuses, so please do not try this out with your valuables.

Popbob Sex Dupe (Fake)
This dupe has no real method, it originates from popbob, a famous 2b2t griefer.