ARK Invest Flags 6.9 Million BTC at Long-Term Quantum Risk as BIP-360 Puts Governance in Focus

On 16 March 2026, ARK Invest and Unchained released a white paper estimating that about 6.9 million BTC, or roughly one‑third of Bitcoin’s supply, could be exposed to future quantum attacks because their public keys are visible on‑chain. Developers emphasize that breaking Bitcoin’s cryptography is not yet feasible and see the main challenge in reaching consensus on upgrades like BIP‑360, while some, including Matt Corallo, argue that capital rotation into AI, rather than quantum fears, is pressuring prices in 2026.