Will quantum computing bring Bitcoin to zero after 2030? 10 questions and 10 answers that cryptocurrency enthusiasts must read Yesterday, a16z published a long article about the threat of quantum computing to blockchain. Here are 10 key questions answered Q1: What is the core difference between quantum computers and regular computers? A: Ordinary computers use binary bits of "0" or "1" to process information, while quantum computers use qubits, which can simultaneously be in a superposition state of "0" and "1", thus achieving parallel computing. Q2: How can quantum computers crack Bitcoin and other cryptocurrencies? A: Quantum computers use their powerful computing power to brute force crack the private key behind the public key of cryptocurrency. Q3: How far are we from this threat at present? A: Quantum computing technology still has at least 5-10 years of development time before cracking cryptocurrencies, requiring 1.5 million quantum bits (currently the largest chip only has 1000+bits). However, it cannot be ruled out that quantum computing technology is advancing rapidly and may be cracked in advance, but the probability is very small. Q4: Are all Bitcoin addresses at risk? A: No, it's not. Only 'reusing addresses' (public key already disclosed) carries high risk. The address used for a single transaction is relatively secure as the public key is not exposed before the transaction. Q5: What percentage of Bitcoin is at risk? About 25% of circulating Bitcoin is stored in reusable addresses, which are most likely affected by early quantum attacks. Q6: Will quantum computing threaten Bitcoin's POW security mechanism? The impact is relatively small. The SHA256 hash algorithm has strong quantum resistance, and quantum computing will only make mining competition more intense, rather than destroying consensus. Q7: How should the Bitcoin community respond? We are currently researching anti quantum algorithms such as hash based signatures and lattice cryptography. It can be upgraded through a soft fork, similar to the SegWit activation process. Q8: What are the risks of Bitcoin upgrading to quantum resistant algorithms? A: There are currently two major risks, the first of which is governance risk. If the community cannot reach a consensus on certain issues during the upgrade process, it may lead to hard fork; The second is those unclaimed bitcoins, as they require the owner to actively upgrade, these unclaimed bitcoins will be quantum breached. According to Chainode data, there are currently hundreds of billions of dollars worth of bitcoins that may belong to unclaimed bitcoins. Q9: Are other cryptocurrencies more secure? Some have integrated anti quantum properties (such as QAN platform), but most face the same challenges. Bitcoin has the strongest upgrade capability due to its abundant research and development resources. Q10: What should ordinary users do now? ✅ Use a new address to receive each payment (best practice) ✅ Avoid long-term reuse of the same address ✅ Pay attention to possible future anti quantum upgrades and migrate assets if necessary Summary: Quantum threats are long-term risks, not urgent crises. The upgrade mechanism and community resilience of Bitcoin enable it to evolve before the threat matures, but there are also governance risks and the risk of theft of unclaimed Bitcoin.