WILL QUANTUM BREAK BITCOIN? W/ Hunter Beast

— Quantum computers pose a potential long-term threat to Bitcoin's ECDSA signature cryptography, though the timeline remains uncertain (5–20+ years away).

— BIP 360 proposes a new soft-fork address type (BC1R) using post-quantum cryptography with three different signature algorithms to hedge against unknown weaknesses in any single approach.

— Vulnerable Bitcoin address types include pay-to-public-key (e.g., Satoshi's coins), reused addresses, and taproot addresses; segwit addresses remain safe as long as they are never reused.

— When users spend from any address, the public key is revealed in the transaction mempool, creating a window for quantum attackers to derive the private key before the transaction is mined or reorgs occur.

— The US government (CNSA 2.0 roadmap) has mandated moving away from elliptic curve cryptography in government systems by 2030–2035, signaling institutional concern about quantum threats.

— Implementing post-quantum cryptography in Bitcoin would increase block verification time (2–4x slower in most cases) and potentially reduce throughput to 1,000–3,000 transactions per block, but introduces design flexibility for security-conscious users.

— Bitcoiners using segwit addresses (starting with bc1q or 1) and never reusing addresses are protected against quantum threats so long as they control their private keys before Q-Day; avoid address reuse to minimize exposure.

— Monitor developments in quantum computing announcements (Microsoft Majorana fermions, Google Willow processor) and consider that post-quantum cryptography readiness may become a consensus issue if quantum progress accelerates beyond current timelines.

— Familiarize yourself with BIP 360 and support research into quantum-resistant solutions now, rather than waiting for an emergency, to ensure Bitcoin has a plan if quantum computers mature faster than expected.