A new report from post-quantum security startup Project Eleven is raising alarm bells across the crypto industry, projecting that the inflection point known as "Q-Day" — when quantum computers can break widely used public-key cryptography — could arrive as early as 2030. The firm's analysis suggests a breakthrough is "more likely than not" by 2033, with sudden, non-linear jumps in capability rather than gradual progress. This has profound implications for Bitcoin, specifically the estimated 6.9 million BTC (worth over $560 billion) that could be exposed due to on-chain public-key visibility, particularly from reused addresses or early pay-to-public-key-hash transactions.
The warning is framed by Mosca's inequality, a principle stating that systems are already at risk if the time needed to migrate to quantum-safe cryptography exceeds the time until attacks become viable. Project Eleven's timelines mirror recent industry moves: Google is targeting a 2029 migration to quantum-resistant cryptography, and the crypto sector is exploring protocol-level solutions. Among them is BIP-361, a Bitcoin Improvement Proposal for transitioning to quantum-safe signature schemes, and a Paradigm researcher's idea to let holders prove ownership via timestamps today for future quantum-safe versions.
The report builds on a recent demonstration in which a researcher derived a 15-bit elliptic curve key using quantum hardware — still far from Bitcoin's 256-bit keys, but a milestone that underscores accelerating capability. Experts remain split on timing, but the trend line is clear: qubit requirements are falling and attack vectors are widening. Project Eleven CEO Alex Pruden noted that "resource requirements keep dropping," and emphasized that their projections are risk scenarios, not exact forecasts, meant to spur early coordination.
