The owner had been trying for eight weeks to brute-force the password on their current Blockchain.com wallet, testing roughly 3.5 trillion combinations using the btcrecover service on a rented computing chip.
But don't get caught in the hype as that is not what happened. Anthropic's AI simply helped the owner search their own computer for an old wallet file, which was then decrypted with a password the owner already had written down in a notebook.
User cprkrn posted the recovery on Wednesday, calling it "the most obvious opening ever" once they figured out what had happened.
The recovery happened when the user "dumped my whole college computer into Claude" as a last-ditch effort, and the assistant located an old wallet backup from December 2019 that was encrypted with a password the user already had written down in a notebook.
The old password decrypted the old backup, which contained the same private keys controlling the current funds, since bitcoin private keys never change.
The password itself was "lol420fuckthePOLICE!*:)" per the user's own X disclosure. Total Vast.ai GPU spend on the failed brute-force attempts was around $15, with the recovery effectively a file search.
For context, breaking bitcoin's actual cryptography would require either a working quantum computer running Shor's algorithm or a flaw in elliptic-curve cryptography that has not been found in 16 years of public scrutiny.
CoinDesk's post-quantum security series earlier this year covered the timeline expectations for that threat, with most researchers placing the cryptographically relevant quantum computer at least five to ten years out.
But the user's experience opens up a further door for AI inside crypto. Forgotten wallets from bitcoin's early years now hold serious value, and recovery tools like btcrecover have existed for years to help users test password variations against encrypted wallet files.
The problem has always been that most recovery work requires technical expertise that the average lost-bitcoin owner does not have.
That is where AI assistants can step in. Instead of manually sorting through folders, timestamps, and backup files across years of accumulated drive clutter, owners can hand the search to an LLM and have it identify patterns, narrow the search space, and surface candidate files.
Millions of bitcoin are believed to remain inaccessible because owners lost passwords, drives, or recovery phrases during the early years.
With bitcoin trading around $79,000, a forgotten laptop in a closet could be holding six figures. Back up wallet data carefully, store recovery phrases somewhere that is not your memory, and check old hardware before you sell it.
