One recent notable achievement by Minecraft@Home was the discovery[0] of the start screen panorama seed which was seen from Beta 1.8 up to 1.12. Reverse engineering Minecraft seeds is an impressive feat given that the search space is so large. The finding of Pewdiepie's survival Minecraft world seed was achieved (without Minecraft@Home) despite him revealing his coordinates via F3 only twice in the entire series[1][2][3].
I should also follow up with a technique that might be of interest to programmers. Some Minecraft blocks have textures that appear rotated in one of four ways. Turns out this rotation is pseudorandom, the rotation number is a result of seeding Java's rand.nextLong() with the (x,y,z) coordinate of that block.[0] This has been used for "malicious" purposes such as finding the location of a base from a single screenshot, which can lead to its destruction on anarchy servers. The author of the linked video used a CUDA search to find the location of a wall of netherrack.
Aside: 2b2t is the most notable of MC anarchy servers. Whenever I read about it, I'm amazed at the machinations of the people that play there. It's kinda like reading Eve Online after action reports of their big battles. I've no inclination to play on 2b2t, but it's great reading all the same.
I have the same feeling about Dwarf Fortress. I absolutely love reading DF stories (see [0]), but the couple times I tried to play I just couldn't get into it.
I'm curious about what the implications of some of these projects will be for 2b2t. Given that the seed is known, couldn't people start finding bases from screenshots using some of these clusters of 'rotations of textures 'tricks?
Yes, these techniques have been used to find bases and destroy them. Along with the texture rotation trick, there's also the position of bedrock whose distribution is fixed in every Minecraft world, so if you show exposed bedrock during a base tour you are at risk of leaking coordinates. Natural terrain is also another factor, so share enough images of the area surrounding the base and it can be leaked similarly.
>One recent notable achievement by Minecraft@Home was the discovery[0] of the start screen panorama seed which was seen from Beta 1.8 up to 1.12.
Can't this be done by reverse engineering the .jar files? You'd think that the start screen would be procedually generated from a seed (eg. rather than load_world_from_file("start_screen.map"), you'd do generate_world_from_seed("my seed"), because that's way easier than hard coding in the generated world.
Part 2 of the videos mentions that Notch replied, saying that he doesn’t remember where the image is from, and that it’s likely coming from a world generated with a random seed.
[0] https://www.reddit.com/r/Minecraft/comments/hthrmk/big_news_...
[1] https://youtube.com/watch?v=LE8ml2hZVZM
[2] https://youtube.com/watch?v=MbAymA6OAa4
[3] https://youtube.com/watch?v=qWnTRNw4mDY