I haven’t played Minecraft in ages. But when I watched his video last month about the panorama seed, it really hyped me up for future discoveries. And now less than 2 months later, pack.png has been found! Great job from the guys behind the project and to salc1 as well for simplifying and summarizing it. Create a world with that seed in 1.3 and then create a world in 1.2.2 and copy level.dat from 1.3 world folder replace in 1.2.2 world folder and then delete all subfolders as chunk files. The open game again and you got it.
Yeah, and they had to check a potentially infinite amount of seeds. That’s why they don’t check every single chunk of every possible Minecraft world. I don’t know how they specifically did this, but they must’ve found ways to skip over checking every chunk by determining which chunks couldn’t possibly have the place they’re looking for. One of the people who worked on this tweeted at notch when they started. He said he didn’t know what the seed was and that he would watch along and hope they find it. Check out SalC1 he has many videos on the topic.