On-Chain College

🔴 𝗜𝘀 𝗤𝘂𝗮𝗻𝘁𝘂𝗺 𝗖𝗼𝗺𝗽𝘂𝘁𝗶𝗻𝗴 𝗥𝗲𝗮𝗹𝗹𝘆 𝗮 𝗧𝗵𝗿𝗲𝗮𝘁 𝘁𝗼 𝗕𝗶𝘁𝗰𝗼𝗶𝗻? Short answer: Yes and No - Let me explain. 👇 The potential threat of Quantum Computing for Bitcoin is probably top-of-mind for many investors right now. Quantum breakthroughs like Google’s 105-qubit Willow processor have sparked fresh debate about Bitcoin’s long-term security. But the conversation often misses a key distinction: the Bitcoin network itself remains extraordinarily robust, while the real quantum risk lives at the individual wallet level. 𝗪𝗵𝘆 𝘁𝗵𝗲 𝗻𝗲𝘁𝘄𝗼𝗿𝗸 𝗶𝘀 𝘀𝗮𝗳𝗲: Bitcoin now runs at 1 zeta hash per second, equivalent to more than one million El Capitan-class supercomputers. 🤯 That’s orders of magnitude beyond the reach of today’s quantum machines - and even beyond those expected in the foreseeable future. 𝗪𝗵𝗲𝗿𝗲 𝗾𝘂𝗮𝗻𝘁𝘂𝗺 𝗱𝗼𝗲𝘀 𝗽𝗼𝘀𝗲 𝗮 𝗿𝗶𝘀𝗸: Not brute-forcing private keys - that would take El Capitan ~10⁵¹ years - but deriving them from exposed public keys using Shor’s algorithm once quantum hardware becomes sufficiently advanced. This puts a spotlight on legacy wallets whose public keys are already visible on-chain. 𝗛𝗼𝘄 𝗯𝗶𝗴 𝗶𝘀 𝘁𝗵𝗮𝘁 𝘃𝘂𝗹𝗻𝗲𝗿𝗮𝗯𝗶𝗹𝗶𝘁𝘆? Estimates suggest 4.5M+ BTC may sit in dormant wallets unlikely to upgrade to quantum-resistant signatures - including Satoshi-era coins. In a worst-case scenario, mass movement of these coins could create real market pressure. 𝗦𝗼 𝘄𝗵𝗲𝗻 𝗶𝘀 “𝗤-𝗗𝗮𝘆” (i.e. the date when quantum becomes a potential threat to Bitcoin)? Expert estimates vary widely: • 2029 (@caprioleio) • ~20% chance by 2030 (@VitalikButerin) • 2045–2065 (@adam3us) Uncertainty is high but importantly, Bitcoin has time to adapt. Quantum-safe BIPs are already being discussed, and the ecosystem has a clear upgrade path. Note: “Google’s Willow has 105 physical qubits today. To threaten Bitcoin’s elliptic-curve cryptography, we’d need on the order of 5,000–10,000 logical qubits - which in practice means hundreds of thousands to millions of physical qubits. Even if you assume an aggressive ‘Neven's Law’ with regular doublings, that puts us many years (and also multiple engineering breakthroughs) away. Keep in mind - 𝗧𝗿𝗮𝗱𝗶𝘁𝗶𝗼𝗻𝗮𝗹 𝗳𝗶𝗻𝗮𝗻𝗰𝗲 𝗶𝘀 𝗮𝘁 𝗴𝗿𝗲𝗮𝘁𝗲𝗿 𝗻𝗲𝗮𝗿-𝘁𝗲𝗿𝗺 𝗿𝗶𝘀𝗸. Banks depend heavily on long-lived RSA/ECC keys across authentication and interbank communications. Once quantum machines can break these, systemic attacks become possible - far earlier than any realistic threat to Bitcoin’s decentralized architecture. 𝗕𝗼𝘁𝘁𝗼𝗺 𝗟𝗶𝗻𝗲 Bitcoin’s network remains overwhelmingly secure. The only meaningful quantum exposure lies in older, inactive wallets - a challenge the community will need to confront, debate, and ultimately solve but we are confident it will. Traditional financial institutions, meanwhile, may feel quantum pressure long before Bitcoin does. Stay humble and stack Sats, André