#Gate广场四月发帖挑战

Quantum computing indeed poses a long-term theoretical threat to Bitcoin's cryptographic foundations, but claims like "cracking in 10 minutes" are often misinterpretations of academic research. Currently, there is still a significant time window before real risks emerge, and the community has already outlined clear defense strategies.

1. The Truth About the Threat: It’s a "Theoretical Scenario" Not an "Immediate Crisis"

The truth about "cracking in 10 minutes": The recent buzz about "Google claiming to crack in 10 minutes" comes from its quantum AI team's theoretical research. The study indicates that, on an idealized large-scale fault-tolerant quantum computer, breaking Bitcoin signatures (ECDSA) could theoretically be reduced to about 10 minutes (close to block time). However, this requires approximately 500k physical qubits, while Google's most advanced processors currently have only about 100, and with high noise levels. This remains a "paper exercise," not an implemented technology.

The real risk point: Quantum computers (running Shor's algorithm) mainly threaten public key cryptography (deriving private keys from public keys), not Bitcoin's hash algorithms (SHA-256). The highest risk is for addresses whose public keys are already exposed on the chain (such as reused old addresses).

2. Impact on Wallets: Not All Wallets Are "High Risk"

High-risk wallets: P2PK (early) addresses or reused addresses. These addresses' public keys are visible for a long time, and once quantum computers become practical, private keys could potentially be reverse-engineered.

Relatively safe wallets: SegWit (starting with bc1q) and single-use addresses. These addresses only reveal the public key hash before transactions; the public key is only briefly exposed during signature broadcasting. Cracking within the 10-minute confirmation window is extremely difficult, and further defenses (like signature aggregation) can be implemented through upgrades.

3. Countermeasures: Community Roadmap vs Personal Risk Management

Protocol upgrades (BIP-360, etc.): The Bitcoin core development community has proposed post-quantum cryptography (PQC) solutions, such as lattice-based Dilithium signatures. The plan is to introduce new quantum-resistant address types (like bc1r) via soft forks and gradually migrate assets. Google also recommends industry-wide migration before 2029.

Personal defense measures:

- Disable address reuse: Never reuse the same Bitcoin address for receiving funds.

- Large cold storage: For long-term assets, store them in cold wallets using unused addresses, ensuring the public key is never exposed.

- Beware of "quantum cracking" scams: Currently, there are no commercial quantum computers capable of cracking private keys. Any service claiming to offer "quantum-safe" hardware wallets requiring seed phrase import is a scam.

4. Timeline and Conclusion

Risk timeline: The academic consensus is that fault-tolerant quantum computers capable of breaking cryptography are unlikely to appear before 2035 or later. Bitcoin has enough time to implement smooth upgrades.

Conclusion: Quantum computing is a "Damocles sword" hanging over cryptocurrency, but not an imminent "beheading" crisis. For ordinary users, the biggest current risks remain poor private key management and phishing attacks, not quantum computing.

In summary: Quantum threats are a "gray rhino," not a "black swan." Keeping wallet software updated and avoiding address reuse can mitigate most current and future risks.