S17 E23: Hunter Beast & Mark Karpelès on Bitcoin's Quantum Upgrade

— Quantum resistance for Bitcoin: CryptoQuick (Hunter Beast) from Surmount Systems is leading efforts to make Bitcoin quantum-resistant via BIP360. The team is raising funds and plans to accelerate development starting June 1st, working across multiple Bitcoin implementations (Core, LibreRelay, Knots, and others).

— Timeline uncertainty: Quantum threat timelines remain unclear due to secretive government quantum computing programs. The NSA launched "Penetrating Hard Targets" in 2013 with $80M annual budgets; U.S. policy bans elliptic curve cryptography sales to government starting January 1, 2027.

— P2PK coin vulnerability and solutions: Approximately 1.7 million dormant Bitcoin exist in exposed P2PK (pay-to-public-key) outputs across 34,000 keys. Proposed solutions include throughput restrictions (BIP360 Hourglass V2 allows ~144 BTC/day movement over 32 years) rather than burning Satoshi's coins, balancing property rights with theft prevention.

— Cryptographic trade-offs: Switching to post-quantum cryptography (hash-based signatures like SLHDSA) will require sacrificing conveniences like HD wallet derivation (BIP32) and extended public keys (XPUB). Solutions like threshold signatures (TSS) and new wallet designs are being explored.

— Avoiding scope creep: Quantum upgrades should remain focused on security and not be bundled with unrelated functionality upgrades like Simplicity smart contracts. BIP54 (Great Consensus Cleanup) and incremental, evidence-based activation through BIP process preferred over drastic hard forks.

— Mark Arpelès on MT. Gox recovery: Most repayments completed; remaining customers may receive new airdrop assets from upcoming BCH fork if the trustee determines market value exists. Lessons include importance of transparency, HD wallets, and avoiding key reuse—technologies unavailable during MT. Gox era.

— Prioritize non-reused addresses and native SegWit: If using exchanges or holding significant amounts, ensure addresses use P2WPKH (native SegWit, displayed as bc1q...) rather than legacy or P2PK formats. Avoid key reuse and consider self-custody to reduce third-party risk ahead of quantum upgrades.

— Monitor BIP progress and community consensus: Follow development of BIP360, BIP54, and activation mechanisms (MASF/UASF) through official channels and the BIPs process. Avoid adopting "quantum-resistant" wallet solutions lacking transparent BIP specifications; opaque cryptographic claims signal red flags.

— Plan for upcoming protocol changes: Expect post-quantum cryptography upgrades over the next 1–5 years. If building or running infrastructure, begin testing compatibility with proposed hash-based signature schemes now; familiarize yourself with threshold signature (TSS) alternatives to BIP39 seed phrases for long-term security.