That'd be me (fellow HNer and belgian programmer)... Very happy to see this upvoted up to HN's frontpage! Any question welcome but I cannot post the solution until the time-capsule opening ceremony on the 15th of May : )
EDIT2: forgot to tell but the mining pool Antpool posted a message in the block header / coinbase data of Bitcoin's block 573138 saying "Congrats Bernard Fabrot for solving LCS35!". My brother tried to time this with the press release which was supposed to come out on friday but then the press release got pushed back to today/monday. So yeah, coinbase data of block 573 138 is kinda very cool (it requires cooperation of a mining pool because it's not just in a transaction but in a block). TYVM to the everybody at Antpool! Big thanks for that : )
EDIT: WIRED article just in. Haven't read it yet. Link if anyone is interested: https://www.wired.com/story/a-programmer-solved-a-20-year-ol...
EDIT2: forgot to tell but the mining pool Antpool posted a message in the block header / coinbase data of Bitcoin's block 573138 saying "Congrats Bernard Fabrot for solving LCS35!". My brother tried to time this with the press release which was supposed to come out on friday but then the press release got pushed back to today/monday. So yeah, coinbase data of block 573 138 is kinda very cool (it requires cooperation of a mining pool because it's not just in a transaction but in a block). TYVM to the everybody at Antpool! Big thanks for that : )