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https://www.csail.mit.edu/news/programmers-solve-mits-20-year-old-cryptographic-puzzle
https://blockchair.com/bitcoin/block/573138
Twenty years ago MIT introduced a puzzle that was specifically designed to not be parallelizable, predicting that it wouldn't be solvable in 35 years.
If I'm getting it right it involves computing a square root of a number a fixed number of times. There is no shortcuts to this, and it it not parallelizable: you need the previous root to compute the next one. (I also suppose that it is easy to verify the solution)
As such it makes for a neat Proof of Work algorithm. Even if it doens't fit the PoW Bitcoin currently has (need to be able to distribute the work), I thought that this was a neat piece of news, and some fresh air in current events.
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Bitcoin has changed a lot over the years.
When people talk about the history of bitcoin, they usually mention two dates.
The first date is 31 October 2018, when Satoshi Nakamoto published the original Bitcoin white paper. The second is 3 January 2018, when Satoshi Nakamoto mined the first block of the blockchain, thus giving birth to the bitcoin network.
But while those two events are, no doubt, extremely important, the hundreds of less known dates that followed suit are when bitcoin’s success was truly forged. Solutions like SegWit have noticeably increased the Bitcoin transaction speed. Accessible bitcoin wallets and mining clients have made using the crypto intuitive and simple. And countless fixes and security patches have made bitcoin one of the safest ways to transfer money online.
The introduction of the Lightning Network is one of these smaller yet incredibly important dates in the history of bitcoin.
https://wunderbit.co/blog/lightning-will-change-bitcoin-forever
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