Bitcoin Developer Proposes 'Quantum Landmines' to Deter Theft From Vulnerable Wallets
Bitcoin Core developer Cory Fields proposed a mechanism in a November 4 post to the Bitcoin Development Mailing List that would require anyone moving quantum-vulnerable BTC to post matching collateral. The design would let prepared owners reclaim coins and seize the attacker's collateral, and no such mechanism currently operates on Bitcoin.
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The Proposal
Bitcoin Core developer Cory Fields published a proposal on November 4 to the Bitcoin Development Mailing List describing a mechanism he calls "quantum landmines." The design would require anyone spending coins from quantum-vulnerable wallets to post matching collateral from a quantum-safe wallet. No such mechanism currently operates on Bitcoin. Fields works with MIT's Digital Currency Initiative.
Under his example, an attacker moving 1 BTC would need to lock another 1 BTC from a quantum-safe wallet. Both amounts would go into a new output with spending restrictions, including a possible 30-day waiting period. An owner who had prepared a hidden ownership commitment in advance could reveal it during that window, reclaiming the coins and the attacker's collateral.
The Threat Being Addressed
The concern centers on wallets whose public keys are already visible on the blockchain. Some of Bitcoin's oldest transaction formats expose public keys directly, and address reuse can leave other holdings exposed. A sufficiently powerful quantum computer could theoretically derive a private key from an exposed public key. Dormant wallets from Bitcoin's earliest years are part of the discussion, though no publicly demonstrated quantum computer can currently carry out such an attack.
Limits and Open Questions
The mechanism depends on owners still controlling their private keys and preparing commitments before quantum attacks become practical. Reporting on the proposal notes that many older wallets may not meet those conditions, because some keys have been lost and some holdings have sat untouched for years. To cover those cases, Fields outlined a separate hidden-bid auction. In one example, a participant could pre-commit a bid against a dormant wallet holding 50 BTC, and after the ownership-proof period expires, eligible bids would split the attacker's collateral and the vulnerable coins would be destroyed.
Fields also considered several rules for who receives the collateral, including successful bidders, miners, or other designated recipients, and a second design suggested in conversation with MIT Digital Currency Initiative director Neha Narula, in which competing bidders face financial penalties. Neither auction guarantees recovery for the original owner. The stated goal is to make theft unprofitable by forcing attackers to risk their own funds. Reporting also flags that the collateral requirement could complicate movement of coins that people legitimately own.
The sources reviewed here describe a proposal, not an adopted change, and the reporting does not give a timeline for review or implementation.
Why It Matters
For Traders
No mechanism is live and no timeline has been set, so the proposal carries no near-term change to BTC supply or spending conditions.
For Investors
The proposal signals that Bitcoin developers are actively working on quantum risk to older, exposed wallets, a long-horizon issue for the network's security assumptions.
For Builders
Any future spending-restriction or collateral output would change how wallets and custody tools must handle timelocks, commitments, and key-exposure hygiene.
This article is for information only and is not financial advice. Read the full disclaimer.
