📜 A hacker "stole" 255 Bitcoin in December 2014… to prevent them from actually being stolen

With a failed update hitting Blockchain.info and due to a critical bug in ECDSA cryptographic signatures, hundreds of wallets become vulnerable and their private keys can be mathematically recovered.
Very quickly, bots start scanning the blockchain to drain the exposed accounts... It’s total chaos.
Then an unknown person appears on Bitcointalk under the pseudonym johoe. Instead of taking advantage of the flaw to get rich, he does the opposite... he empties the compromised addresses himself to secure the funds before the bots can.
He even publishes over 1,000 vulnerable addresses to prove his claims and warn users.
In total, he "saves" about 255 BTC, worth nearly $90,000 at the time. Then he transfers all the funds to Blockchain.info’s official address so the victims can be reimbursed.
Years later, his identity is revealed: Jochen Hoenicke, a German cryptographer and future researcher at Trezor.
He could have disappeared with a fortune. Instead, he became one of the greatest "white hats" in Bitcoin history.