Bitcoin Developer's Clever Trap to Make Quantum Hackers Pay

A Bitcoin developer proposes hidden 'landmines' that could force future quantum thieves to risk losing their own coins when stealing.

What if stealing Bitcoin could cost a thief their own money? That's the clever idea behind a new proposal from Bitcoin developer Cory Fields.

First, some background. Every Bitcoin owner has a secret private key (like a password that lets you spend your coins) and a matching public key (which lets the network verify you without revealing the secret). Today's computers can't figure out your private key from your public one.

But a future quantum computer (an extremely powerful type of machine) could break this protection using a method called Shor's algorithm, potentially letting hackers steal coins. Experts call the day this becomes possible "Q-Day." No such machine exists yet.

How the "landmine" works:

Before Q-Day, a Bitcoin owner creates a tiny hidden "ownership receipt" proving they controlled their coins when quantum theft was impossible.
If a thief later uses a quantum computer to grab the coins, they must add an equal amount of their own Bitcoin as collateral (a security deposit).
There's a waiting period (30 days in Fields' example) before the thief can access the coins.
The real owner spots the theft, reveals their hidden proof, and takes both their original coins AND the thief's deposit.

Because thieves can't know which wallets are booby-trapped, every theft becomes a risky gamble.

For lost or abandoned coins, Fields suggests "auctions" where people can challenge thieves. In some versions, the stolen coins are simply destroyed rather than returned — the goal is to make stealing unprofitable, not to recover the money.

Important catches:

These are only "thought experiments," not finished plans.
Honest owners would also need spare Bitcoin as collateral to move their own coins.
Offline owners might miss their chance to object and lose their savings.
Bitcoin would first need quantum-safe wallets and new network rules everyone agrees on.

The idea offers an alternative to simply freezing old wallets, which could permanently lock out honest people who never moved their coins. For now, it remains an intriguing possibility rather than reality.

This is an AI-generated summary. Read the original article at: https://decrypt.co/382761/bitcoin-developer-quantum-landmines-losing-bet