Over 6 million Bitcoin, worth hundreds of billions of dollars, are sitting behind public keys that could be cracked by sufficiently advanced AI, and most holders have no idea they're exposed.
That figure comes from Glassnode co-founder Jan Happel, whose latest on-chain analysis quantifies just how much of Bitcoin's supply is vulnerable due to publicly visible cryptographic keys. These are wallets where the public key has already been broadcast to the network, meaning anyone who cracks the underlying elliptic curve math gets a direct path to the funds inside.
For years, this was a theoretical footnote. Now it's a live conversation at the top of crypto research circles.
Why AI Changes Everything
Ethereum researcher Justin Drake is sounding the alarm loudest. Drake has urged the broader crypto community to begin preparing for a scenario where AI-accelerated computing dramatically shortens the timeline to breaking current wallet cryptography. The concern isn't that it happens tomorrow. The concern is that nobody will see it coming until it's too late to move funds.
Here's the part that matters: Bitcoin addresses only expose a public key after the first outbound transaction. Wallets that have never spent funds, or those using modern address formats, carry less risk. But wallets that have already sent transactions, including many long-dormant early Bitcoin addresses, are fully exposed. That pool runs into the millions of coins.
The Sitting Duck Problem
Glassnode's data makes the scale hard to dismiss. Six million BTC is roughly 30% of the total circulating supply. Some portion of that includes lost coins and wallets belonging to holders who will never move them. But a meaningful slice belongs to active participants who simply don't know their security model is aging out.
This isn't a bug in Bitcoin. It's a known property of how ECDSA cryptography works. The problem is that the threat level attached to it is no longer static. AI-driven advances in computational power are compressing timelines that once felt safely distant.
What Holders Should Actually Do
Security researchers recommend migrating to wallets that use newer address formats, specifically those that don't expose the public key until spending occurs. More importantly, watch for any coordinated push from Bitcoin developers toward post-quantum cryptographic standards. That conversation is already happening quietly, and when it goes public, it will move markets.
If you hold Bitcoin in a wallet that has sent funds before, treat this as a prompt to review your setup. The window to act comfortably is open now. History suggests people move only after the first high-profile exploit makes headlines.
Watch the quantum cryptography policy discussion closely. It is no longer theoretical noise.