[1.12] The Quest for the Bedrock Item

oof... when a super gold diamond netherite omega super efficiency 50 pick gets added, we could get bedrock easily.

I simplified the code a bit for the video, it does make a bit more sense when you look at the actual code. It's a bit hard to explain with the actual code because 1) most people can't read Java, 2) there's lots of irrelevant stuff and 3) the relevant code can be spread across more than one location/file.

@Earthcomputer this is called a race condition right?

@ori61 51 no

@Earthcomputer is it a kind of race condition?

@ori61 51 A race condition is if code is executed at the same time (i.e. via threads) where it is not clear/fixed which executes first. Earth Computer mentions an idea with multithreading briefly, but dismisses it. The exploit works on one thread, no race condition. It simply triggers more functions in place before continuing with the block-dropping function

@ori61 51 It's more of a "time-of-check to time-of-use" issue. 

See https://en.wikipedia.org/wiki/Time-of-check_to_time-of-use.

@magicus "In software development, time-of-check to time-of-use (TOCTOU, TOCTTOU or TOC/TOU) is a class of software bugs caused by a race condition..."

Unstable TNT actually does its explosion at the end of mining rather than at the start. You don't normally notice because it's always insta-mined, but it makes a difference in this case. The 3 blocks I showed are the only 3 blocks in the game with a left click action in 1.12, I used the IDE to list them all.

Slicedlime showed in his recent half-heart-hardcore challenge how he instabroke the glass while mining sugarcane, so that's probably gonna be looked at.

The client keeps track of the block break progress at the block it's currently mining. The server keeps track of something different, the number of client-side ticks that have passed since the player started mining (the client sends a mining packet every tick). This means that the client-side break progress can increment at different rates depending on what block you're hitting, but the server always increments at 1 tick per tick no matter which block. The server will only break the block when enough ticks have passed to break the block that is there at the end.
In your video there, what is probably happening is that the client is incrementing its mining progress according to whatever is there each tick (dirt or iron), but the server is only keeping track of how many ticks mined. The client then thinks it's got enough progress to mine the iron block, but the server knows you've only been mining for X ticks and that's not enough to mine the iron block, so it says no. Then you push down the glass block and the server breaks it because X is enough ticks to mine a glass block.
While definitely cool, this quirk is not enough to mine bedrock, because although it might somehow be possible to trick the client into thinking it's got enough progress to mine it, bedrock requires an infinite number of ticks to mine so you will never mine it server-side.
Just as an aside, the way these hacked clients mine blocks faster is they send more mining tick packets than a vanilla client would, which causes the server to increment the ticks faster.

@gnembon ohhhh, so that is how grian broke stone with a shovel in hermitcraft

@Alexandre J. W. Klaus well it may also be an inventory glitch that happens

Not erased, just extracted, compressed into a tight ball and forcefully shoved into all the Anarchy servers.

@sharpfang The way of doing this isn't possible on anarchy servers, so I have nothing to fear of the anarchy community.

@TheTroll2001 _ Not necessarily anarchy servers. It's Paper, other forks of Spigot or modded servers in general that prevents stuff like this from functioning.

thats where youre wrong, its the day at wich sadness starts for everyone that has a base and mean friends

we meet once again

welp, it has been done

It's been obtained in 1.8 and one of the more modern versions switched to like a loottable sort of dealio which removed the silk touch oversight IIRC.

What Matthew said, and also the fact that it's no longer possible to modify loaded chunks through population. That's not to say getting the bedrock item is necessarily impossible in newer versions, but it would require an entirely different oversight, probably one that didn't exist in 1.12.

I have a carpetmod workspace setup for 1.12, you can get one too if you clone it and follow the readme. Also for 1.12 there's also MCP. For the mining speed mod at the beginning, since that needed clientside modifications too, I used liteloader with mixins.

Earthcomputer ah i see, thanks! I am not where near proficient enough with java to understand where to even start with mixens lol. I've tried looking at genmbons carpet mod mixens, all hieroglyphs to me

Earth has wack videos. Like they're always really well thought out

Why dont u have the verified tick???????

@xi he does now

@Ram Krishan Charan ohh yeahhh

@xi you need 100k, idk if he had that of the time of this

It does get called for every block in the game. But for every block except for the mentioned ones, it's an empty method, so it's no use. As you need it to load a chunk/trigger population.

​@Landmining Thanks for the clarification.

Exactly what they did on scicraft

The list shown in the video is exhaustive

@Teryllim hm, okay thx

its entity id, lowest id gets it every time

@_Kayleigh changes the entity id when you move? or can you somehow influence it that it is always low?

@Super Hase no, its assigned when you log on and they are allocated sequentially

​@_Kayleigh xD i dont understand mojang why is this not also used for enchanting or for unbreaking.

@Super Hase why would you use entity id for randomness? its inherently non-random

@_Kayleigh so you could tecnicly influence it that you have a higher chance of getting an item?

@Super Hase just log on before everyone else and you should get all the items, assuming it's a vanilla server

best idea ofc

doesnt that defeat the point of this then? you can just get the bedrock in 1.8 and people dont want to downgrade etc

@TAXMAN Do you mean that method of building flying machines, flying into the ungenerated end chunks and breaking a torch in place where obsidian pillar should generate? Don't you need to repeat it thousands of times before an expected place coincides with the real one? Or is there a more reliable way of getting it in 1.8?

mining duration is handled by the server. if the server thinks you can't instamine then you won't instamine.

though this is from a year ago, you probably figured that much out

We miss both of you. Hope you're both doing okay. :)

I mentioned in the video that these hacked clients don't work for getting the bedrock item.

This was really well explained, even for a complete non-coder like me! Keep up the great work Earth! ❤️

owo

Ofc

Did you think he left?

Because :Mojank:

bedrock item best scaffolding, very useful as well.

Illmango has a video on that.

it is possible to have wireless redstone...

there are multiple ways to do it

mess detector is best way to do wireless redstone xD