Bitcoin and ether holders urged to enter 'bunker mode' against possible AI attacks

A warning from Ethereum researchers about the security of cryptocurrency signature schemes became the dominant crypto story of the day, drawing debate across the industry and coinciding with a slide in major token prices.

According to CoinDesk, Ethereum researchers said artificial intelligence could break the signatures guarding bitcoin, ether and the tokens built on them "in months, not years" in the worst case — a timeline that would arrive well before quantum computers are widely expected to pose a practical threat. The researchers urged bitcoin and ether holders to enter what they described as "bunker mode," a defensive posture aimed at reducing exposure to that risk.

The core of the concern relates to how public-key cryptography underpins ownership on blockchains. Digital signatures are what prove that a transaction was authorized by the holder of a given set of coins. If the mathematics behind those signatures could be attacked faster than expected, the assumptions that secure on-chain balances would need to be revisited. CoinDesk noted that AI systems are increasingly finding flaws and loopholes in human-written code, while a quantum-computing attack has remained a long-standing concern among bitcoin and crypto developers.

One metric highlighted in coverage of the story was the share of bitcoin supply sitting at addresses with an exposed public key, drawn from on-chain analytics firm Glassnode. That figure matters because coins whose public keys have already been revealed on-chain are generally regarded as more exposed to any future break in signature security than coins held at addresses where the public key has not yet been published.

The call did not land uniformly. CoinDesk reported that the "bunker mode" call divided crypto, with the debate playing out as prices fell. In a separate piece, the outlet reported that "bunker mode" presents a far greater challenge for institutions than for individual crypto holders — a reflection of the operational complexity large custodians, funds and corporate treasuries face when changing how keys are generated, stored and rotated, compared with a retail user moving funds between addresses.

Markets were weak alongside the debate. CoinDesk reported that bitcoin slipped below $83,000, and its live markets coverage described bitcoin breaking lower from its recent trading range and sliding back toward $82,000. The reporting did not establish that the security warning caused the decline, and crypto prices routinely move on a mix of macroeconomic, liquidity and positioning factors. Readers should treat the timing as coincident rather than proven causation.

The episode fits into a broader, years-long conversation in the Bitcoin and Ethereum developer communities about migrating to post-quantum or otherwise hardened signature schemes. Such a migration is technically and socially difficult: it typically requires protocol-level changes agreed by a decentralized set of participants, coordinated wallet and exchange upgrades, and a plan for coins held in dormant addresses whose owners may never move them. Those constraints are part of why timeline estimates — whether framed around AI capability or quantum hardware — are contested among researchers.

For now, the practical takeaway reported is informational rather than prescriptive. The researchers' position is that the risk window may be shorter than previously assumed; critics of the framing argue the warning is premature. No protocol change, exchange policy or regulatory response tied to the warning was reported at the time of publication.

This article is for information only and is not financial, investment, legal or tax advice. Nothing here guarantees any future price movement.

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