Bitcoin Developer Proposes Quantum Landmines and Auctions to Deter Future Theft
Bitcoin developer Cory Fields outlined three untested ideas on the Bitcoin development mailing list on November 4 for making quantum-enabled theft of vulnerable coins economically costly. He described them as thought experiments that could potentially be implemented through a soft fork, with key design questions still unresolved.
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What Fields Proposed
Bitcoin developer Cory Fields, who works on Bitcoin software at MIT's Digital Currency Initiative, posted three concepts to the Bitcoin development mailing list on November 4. He described them as thought experiments rather than a completed upgrade, though he said they could potentially be implemented through a soft fork. All three aim to make quantum-enabled theft of vulnerable coins a costly bet for the attacker.
The first concept, called Quantum Landmines, lets a holder secretly commit a cryptographic proof to a small quantum-safe output before quantum computers can break existing cryptography. If an attacker later steals a vulnerable output, the coins must be moved alongside an equal amount of the attacker's own quantum-safe BTC as collateral. The combined funds sit locked for a challenge period, such as 30 days, unless the thief can prove prior knowledge of the private key. The legitimate owner can then reveal the committed proof and claim the collateral.
Auction-Based Alternatives
The second mechanism, the Staked Auction, covers holdings whose keys may be lost and therefore cannot be protected by landmines. Holders would stake quantum-safe BTC in advance, effectively placing bids on vulnerable outputs. An attacker attempting to move a targeted holding would need to post matching collateral, and after a waiting period, stakers could reveal their bids and claim portions of that collateral. Fields said the original vulnerable coins would be destroyed rather than returned to a bidder, with the aim of removing a reliable payday for thieves.
The third concept, the Sats Auction, requires no advance staking. Each attempted spend of legacy coins would trigger an auction after an initial time-lock. The highest bidder would receive the coins minus their bid, while the runner-up would forfeit their bid and receive nothing. Fields argued this could make continued attacks increasingly expensive.
Open Questions and Timing Context
Fields acknowledged several unresolved design questions, including collateral ratios, auction rules, the treatment of losing bids, and how recovered funds should be distributed. The mechanisms also have clear limits: landmines only work if an owner prepares one before a quantum attack and reveals it in time, and neither landmines nor auctions can protect coins whose keys are already lost.
The proposals arrive against a backdrop of quantum risk estimates. Last month, Alice & Bob estimated that a quantum computer using 29,588 cat qubits could crack a Bitcoin private key in about 62 minutes. Other analysts are less alarmed. Earlier this year, on-chain analyst James Check argued that quantum computing would not trigger a catastrophic Bitcoin market collapse, and that even the theft and sale of Satoshi-era coins would not threaten the network's survival. No publicly demonstrated quantum machine can currently break Bitcoin keys, and the timing of any such capability remains unknown.
Where Coverage Diverges
Reporting on the proposals is consistent on the core mechanics, but it differs on framing. CryptoPotato characterized the ideas as financial incentives, time-locks, and auctions designed to discourage quantum theft. Decrypt, which described the proposals in more explicit terms, emphasized that the auctions are meant to deprive thieves of a reliable payoff rather than return coins to missing owners. Neither outlet reports any formal review, implementation timeline, or endorsement from other Bitcoin developers, and the proposals remain at the level of mailing-list discussion.
Why It Matters
For Traders
These are untested mailing-list concepts with no implementation timeline, so they should not change near-term BTC positioning or flows.
For Investors
A credible on-chain defense against quantum theft would reduce a long-tail tail risk for legacy holdings, but its path to adoption remains uncertain.
For Builders
Any soft fork touching output spending rules would affect wallet, script, and custody design, so watch the mailing list for specification drafts.
This article is for information only and is not financial advice. Read the full disclaimer.
