A crypto owner who hadn't touched a Bitcoin wallet in years finally got back $395,000 worth of BTC this month after an eight-week brute-force marathon — aided by Anthropic's AI, Claude. The wallet, held on Blockchain.com, had been locked behind a forgotten password. Using the open-source tool btcrecover on a rented computing chip, the owner tested roughly 3.5 trillion password combinations before cracking it.
The brute-force marathon
The owner had given up hope of ever accessing the funds. But after learning about btcrecover, a password-recovery tool that works with Bitcoin wallets, they decided to try. The process was anything but quick. For eight straight weeks, the rented chip churned through every possible password variation — more than 3.5 trillion guesses in total. That’s the equivalent of trying a billion different passwords every two hours.
Why so many attempts
Wallet encryption keys aren't easy to guess. The owner had no record of the password, only a vague memory of what it might have been. Without a password hint, the only option was a straight brute-force — testing every plausible combination. At that scale, even a powerful rented chip takes weeks. The tool's efficiency mattered: btcrecover is designed to skip dead ends and prioritize likely patterns, but it still took trillions of guesses to land on the right string.
Claude's role in the recovery
Claude wasn't running the brute-force itself — that was btcrecover's job. But the AI helped the owner narrow down the search space. By analyzing the owner’s memory fragments and known password habits, Claude suggested patterns and likely character sets that btcrecover could target first. That kind of human-AI collaboration — feeding likely inputs into a brute-force engine — is what turned a years-long fantasy into a real recovery. Without Claude's pattern guidance, the search might have taken even longer, or failed entirely.
This is one of the larger recoveries of trapped crypto ever publicly documented. The $395,000 figure underscores just how much value can sit dormant behind a lost password. But the method isn't for everyone: renting a chip for eight weeks and running 3.5 trillion guesses costs serious time and money. For smaller balances, the effort wouldn't be worth it. Still, the case shows that even long-lost wallets aren't necessarily gone forever — if you have the right tools and a bit of AI help.
