Claude AI helps Bitcoin holder recover $400K wallet locked for 11 years

An X user going by cprkrn regained access to 5 BTC — worth roughly $400,000 — after spending more than a decade locked out of an old wallet whose password they had changed while high and promptly forgotten. Years of attempts with btcrecover, the standard open-source brute-force tool, had gone nowhere, even after they found a candidate seed phrase in a college notebook that confirmed which wallet file held the coins.

The breakthrough came when the user fed an entire archive of old college-era files to Claude. The model surfaced a December 2019 backup of the wallet that predated the forgotten password change, and crucially identified a bug in how btcrecover was combining the shared key with candidate passwords. With that fix applied and the older backup in hand, the tool successfully decrypted the private keys.

The story is less about an LLM guessing 3.5 trillion passwords than about AI acting as a competent forensics assistant — triaging a messy data dump, spotting a tooling misconfiguration a human had missed, and reframing the recovery problem. It’s a useful illustration of where general-purpose models are genuinely effective: pattern-matching across unstructured artifacts and debugging brittle open-source tooling.