Bitcoin’s Exposed Keys and the “Bunker Mode” Debate: Is AI a Real Threat?

Visible Keys: A Growing Target

The number of bitcoin sitting behind public keys visible on the blockchain has surged past 6 million, representing 31.2% of all circulating coins. This exposed share is up by 222,000 BTC—worth $18.

A closer look reveals that some platforms are far more exposed than others: Binance leads with 83% of its bitcoin holdings behind visible public keys, while Robinhood’s exposure stands at a full 100%. In contrast, Coinbase’s share is just 10%, and Fidelity sits at 2%. Notably, government-held bitcoin in the U.S., U.K. And El Salvador shows zero exposure under this methodology.

Bunker Mode: Paranoia or Precaution?

On Wednesday, Ethereum Foundation researcher Justin Drake sounded alarms on X (formerly Twitter), urging large holders to consider “bunker mode.” His advice: gradually move funds to new addresses whose public keys have never been revealed onchain. Drake’s warning follows OpenAI’s release of 722 mathematical manuscripts produced by an unreleased AI model—a development he cites as evidence that AI-driven advances could threaten the cryptography securing bitcoin and ether wallets.

OpenAI’s release on Tuesday included 722 manuscripts generated by a model tested on 4,000 research problems.

Yet so far, no real-world attack against bitcoin or Ethereum wallet keys has been documented in any research reviewed by CoinDesk.

Drake’s call for caution was not universally embraced. Ethereum co-founder Vitalik Buterin acknowledged that AI might accelerate mathematical breakthroughs relevant to cryptography but advised against panic moves. Meanwhile, Samson Mow of Jan3 dismissed concerns as premature, telling followers there was no need for alarm after Drake’s post attracted nearly four million views.

AI Cracks: Are Keys at Risk?

The core concern is that AI models could eventually crack the elliptic curve signatures protecting crypto wallets—especially those whose public keys have already been exposed through address reuse or certain bitcoin output types like Taproot. On Ethereum, the risk is even broader: any account that has ever sent a transaction has necessarily revealed its public key. While these exposures have been known for years, the pace and scope of recent AI progress have revived old fears.

Concrete incidents have yet to materialize. In late July, the Bitcoin Red Team used AI to scan 390 open-source Bitcoin software projects in just over a day, finding nearly 5,000 possible flaws—85 rated critical—but none involved breaking private keys themselves. Last December, Anthropic researchers demonstrated that advanced AI models could write working exploits against simulated DeFi contracts but did not show any breach of foundational wallet cryptography.

The headline number—over $18 billion in newly exposed bitcoin since May—looks alarming; yet without a practical attack demonstrated against private keys themselves, some industry leaders see little reason to scramble.

No Hacks Yet—So Why Panic?

Crypto prices responded swiftly to the debate: Bitcoin dropped to $82,300 during Asian trading before rebounding to around $82,800—a roughly 4% slide form Tuesday’s high near $86,600. The CoinDesk 100 index mirrored this dip with a near 2% loss over 24 hours. This market reaction highlights how quickly security fears can sway sentiment even when no concrete exploit has occurred.

Still, it’s unclear whether “bunker mode” will become standard practice or remain an outlier recommendation.

What deserves close attention

If large bitcoin holders follow Ethereum researcher Justin Drake's Wednesday call to migrate funds to fresh addresses due to AI-driven risks, immediate onchain movements could be observed among the over 6 million BTC (31.2% of supply) currently behind exposed public keys; however, no practical attack exploiting these keys has yet been demonstrated, so whether significant transfers occur remains unclear.