$470 Billion Risk: Bitcoin's Quantum Countdown Starts

TL;DR

Quantum computers could crack Bitcoin's wallet encryption, putting ~$470B in exposed BTC at risk, and BIP 360 is Bitcoin's first formal step toward protection.

Key Points

• 1.Approximately 6.87 million BTC worth ~$470 billion sits in wallets with exposed public keys. Project 11's risk list tracks these addresses; Taproot (BC1P) wallets are especially vulnerable because public keys are exposed on-chain the moment funds are received, not just when spent.
• 2.'Qday' timelines range wildly — from 2028 to 40+ years away. Vitalik Buterin warns ECC could break as early as 2028; Adam Back says 20–40 years; Solana co-founder Anatoli Yakovenko gives it a 50/50 chance within 5 years; Bernstein analysts call it decades away.
• 3.Bitcoin mining (SHA-256) is already quantum-resistant, but wallet encryption (ECC) is the critical vulnerability. Shor's algorithm could allow a quantum computer to reverse-engineer a private key from an exposed public wallet address, enabling theft without ever needing the seed phrase.
• 4.BIP 360, drafted in June 2024 by pseudonymous developer Hunter Beast, introduces a new address type P2MR (BC1Z) to eliminate key-path public key exposure. It was added to Bitcoin's official improvement proposal repository in February 2025 and is described as a 'conservative first step,' not a complete quantum fix.
• 5.Full implementation of BIP 360 could take up to 7 years according to co-author Ethan Hileman. The timeline includes ~2.5 years for review and testing, 6 months for activation, and then years more for wallets, custodians, Lightning nodes, and payment processors to adopt it.
• 6.The 'Hourglass' proposal by Hunter Beast acts as a damage-control fallback, not a prevention tool. It would restrict vulnerable P2PK coins to one input per block, stretching a potential mass-theft event from a single day to ~8 months, giving markets time to absorb the shock.
• 7.Freezing or burning vulnerable BTC — backed by figures like Jameson Lopp and Matt Corallo — is rejected by the video as a dangerous precedent. Confiscating or invalidating coins would undermine Bitcoin's core principles, damage its 'digital gold' narrative, and deter institutional and retail adoption.