Bitcoin Core developer Cory Fields thinks it should. He works on Bitcoin’s software at MIT’s Digital Currency Initiative. This week, he laid out the idea on the bitcoin-dev mailing list. It could also change how we think about lost Bitcoin recovery.
The idea lands in the middle of a heated debate. The Bitcoin quantum threat has divided developers for some time. Some want to freeze vulnerable coins. Others would leave them spendable for anyone with a valid signature. A freeze could stop thieves, but it might lock out owners who never upgraded. Fields now offers a third route built on financial deterrence.
Quantum Computing Bitcoin: Why the Threat Matters Now
Quantum computing Bitcoin worries start with one weak spot. A powerful enough quantum computer could work out a wallet’s secret spending key from its public key. Some early Bitcoin payments exposed those public keys from day one. Those coins are now potential targets. Coins linked to Satoshi Nakamoto are among them.
So why is this so serious? A thief who derives a key can sign a valid transaction. The network would accept that signature without question. It can’t tell a thief from the rightful owner. That’s the gap Fields wants to use against attackers.
Fields calls his proposals “thought experiments”. They assume Bitcoin first gets quantum-safe wallets. He hasn’t written the rules needed to enforce them either. So nothing is ready to switch on today. Still, it shows one developer weighing deterrence against a freeze.
Timing is the other worry. Developers want defences in place before Q-day. Planning early gives owners more choices than reacting after thefts begin. That’s why landmines catch attention. They reward people who act before quantum attacks become possible.
Cory Fields, a Bitcoin Core developer, shared the landmine concept on the bitcoin-dev mailing list. [Brink.dev]
How Quantum Landmines Would Work
Fields attaches a price tag to the attempt itself. The trap works in a few simple steps:
- Preparation: Before quantum attacks arrive, the owner creates a separate quantum-safe landmine holding hidden proof of ownership.
- Collateral: Stealing 1 BTC would require another 1 BTC from a quantum-safe wallet.
- Lock-up: Both coins are then locked for a waiting period, such as 30 days.
- Reveal: During that window, the owner reveals the proof, reclaims their bitcoin and takes the thief’s collateral.
- Blind risk: The thief can’t tell which holdings contain a trap before committing their own money.
Fields uses a character called Alice to explain it. She could bait a quantum attacker before Q-day. That’s the point when quantum attacks become possible. Later, she could double her vulnerable coins.
Attackers would grow wary, since any coins might hide a mine. If a theft happens, Alice spots it during the wait. She spends the in-limbo output using her landmine. She moves her own coins and takes the attacker’s collateral.
The incentive is clear. Owners who set traps early get a second chance. Those who do nothing stay exposed.
Why Lost Bitcoin Recovery Remains Unsolved
Landmines have one big limit. They only work for owners who still hold their keys. That rules out coins believed lost, including Satoshi Nakamoto’s. For those, Fields sketched an auction system. It works like this:
- Hidden bids: Network rivals stake hidden bids on a vulnerable wallet in advance.
- Cryptographic traps: The bids act like traps if a quantum thief attacks.
- Automatic trigger: The highest bidder’s smart contract triggers automatically.
- Penalty: The thief’s target coins are burned or destroyed instantly.
- Bounty: The thief’s locked collateral passes to the winning bidder.
In effect, the auction seems built to deter theft, not return coins. Lost Bitcoin recovery, in the sense of reuniting coins with owners, stays out of reach.
The Hidden Costs for Honest Holders
Nothing here comes free. Fields admits the scheme could burden honest users. The main costs are these:
- Matching collateral: Someone moving their own 1 BTC would also need another 1 BTC.
- Large old holdings: A holder with an entire fortune in one old wallet needs matching funds to move it.
- Indistinguishable users: The blockchain can’t tell a quantum thief from the true owner.
- Unwritten rules: Fields hasn’t written the enforcement rules yet.
That’s why the ideas remain exploratory. Any real rollout would need detailed rules and broad agreement.
When Could the Bitcoin Quantum Threat Become Real?
The source report doesn’t give a date for Q-day. Fields’s ideas also depend on quantum-safe wallets arriving first. That step has to come before any landmine exists. Until then, the debate will keep running on the bitcoin-dev mailing list.
What should holders watch next? First, quantum-safe wallets in Bitcoin’s software. Second, written enforcement rules for any collateral scheme. Third, whether developers back freezes, landmines or something else.
The quantum computing Bitcoin debate won’t end soon. Fields has offered a clever option, but a costly one. Lost coins remain the toughest case. Their owners can’t set traps, and nobody can reclaim them.
Also Read: How 24/7 Trading Could Reshape Wall Street’s Crypto Market Economics
FAQs
Q1: How much collateral would a thief need under the landmine plan?
A1: A thief stealing 1 BTC would need to supply another 1 BTC from a quantum-safe wallet. Both coins would then be locked for a waiting period, such as 30 days.
Q2: How long would owners have to respond to a suspected theft?
A2: In Fields’s example, the waiting period is 30 days. In that window, the owner reveals the proof, reclaims their bitcoin and takes the thief’s collateral.
Q3: Can landmines protect coins believed lost, such as Satoshi’s?
A3: No. Landmines only work for owners who still hold their keys. For inactive coins, Fields sketched an auction system using hidden bids.
Q4: Would honest holders pay extra to move their own coins?
A4: Yes. Moving 1 BTC would also require another 1 BTC as collateral. A holder with an entire fortune in one old wallet would need matching funds.
Disclaimer:
This article is an example of what developers propose, and therefore is not to be construed as financial, investment or legal advice. Thought experiments such as the so-called ‘Quantum Landmines’ are just that, as there are no rules. Readers of this article must do their own research, and it is advised that readers consult an Australian Financial Adviser before deciding to move, upgrade or lock any Bitcoin. Do not use this article as the sole basis for making any decisions involving the movement of your funds.
