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Key Takeaways
- QSB’s compute estimate fell about 79%.
- AI-assisted developers accelerated two computational searches.
- No practical quantum attack threatens Bitcoin today.
- QSB requires eligible outputs and miner coordination.
- The $67 estimate remains unproven on mainnet.
What StarkWare means by a Bitcoin “quantum backup”
“Quantum backup” is shorthand for Quantum-Safe Bitcoin, or QSB, an experimental transaction method developed by StarkWare. It uses hash-based cryptography to move eligible bitcoin under Bitcoin’s existing rules, without waiting for the network to adopt another signature system.
The method addresses a future risk in Bitcoin’s elliptic-curve signatures. A sufficiently powerful fault-tolerant quantum computer could theoretically derive a private key from a visible public key, allowing an attacker to spend the associated funds.
No publicly known quantum computer can perform that attack against Bitcoin today. QSB is being developed as a contingency rather than a response to an active breach.
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