Headline: Google sets 2029 deadline for post‑quantum migration — and Bitcoin developers are being put on notice Google this week told its engineers and customers to be ready: migrate authentication to post‑quantum cryptography by 2029. That deadline — backed by Google’s own progress in hardware and error correction — has rekindled a debate in crypto circles over whether the once‑distant quantum threat to blockchains is suddenly much nearer. Why quantum matters for crypto, fast - Classical computers use bits (0 or 1) and test possibilities sequentially. Quantum computers use qubits, which can exist in superposition (both 0 and 1) and explore many possibilities at once. For most tasks the advantage is small, but for specific math problems such as factoring and discrete logarithms, a powerful quantum machine could dramatically outpace classical systems. - Public‑key cryptography used by blockchains — Bitcoin’s ECDSA signatures, and even SHA‑256 in theory — falls into that “specific problems” category. Shor’s algorithm, run on a sufficiently powerful quantum computer, can derive private keys from public keys and let an attacker spend any exposed funds. What changed since Willow When Google revealed its Willow quantum chip in December 2024, it had just 105 physical qubits and the industry largely concluded a threat was decades away. Back then, estimates suggested roughly 5,000 logical qubits would be needed to run Shor’s algorithm at scale, and each logical qubit would require thousands of physical qubits for error correction — implying millions of physical qubits overall. The numbers haven’t suddenly jumped to millions; what’s shifted is error‑correction progress and institutional posture. Google says its hardware and error‑correction roadmap, plus updated factoring resource estimates, justify a 2029 migration target. That corporate-level urgency is echoed in product moves: Android 17 is integrating post‑quantum digital‑signature protection, Chrome supports post‑quantum key exchange, and Google Cloud now offers post‑quantum options to enterprises. Ethereum vs Bitcoin: Two very different responses Ethereum has treated the risk as urgent for years. The Ethereum Foundation has been working on post‑quantum defenses since 2018, and this week launched pq.ethereum.org as a hub for the effort. Multiple foundation teams and more than ten client teams are running weekly devnets under “PQ Interop.” The roadmap details four upcoming hard forks taking the protocol from a post‑quantum key registry to full post‑quantum consensus. Bitcoin’s governance model makes the same kind of coordinated, multi‑year push harder. There is no single foundation with the mandate and budget to direct a big migration effort; changes require broad consensus across a decentralized developer community that tends to move cautiously. The last big cryptographic upgrade, Taproot, took years of discussion before activation in 2021. That contrast drew blunt public criticism this week from Nic Carter, co‑founder of Castle Island Ventures. He called Ethereum’s approach “best in class,” praising its clear 2029 PQ roadmap and active execution. Bitcoin, he said, is “worst in class”: he noted there’s currently one quantum‑related proposal for Bitcoin that has “received zero buy‑in from top devs,” and described a lack of coherent strategy, roadmap, or multi‑team engineering program. “Everyone knows I’m a bitcoiner and would like bitcoin to win,” Carter added. “Not saying this to hurt feelings. Saying this to spur action.” Skeptics urge calm — but the consensus remains that migration is inevitable Not everyone thinks a near‑term catastrophe is likely. Analysts at CoinShares estimate the amount of BTC densely concentrated in vulnerable legacy address types is small — roughly 10,200 BTC in positions that could cause “appreciable market disruption” if stolen. Another ~1.6 million BTC held in older pay‑to‑public‑key (P2PK) addresses is highly fragmented across more than 32,000 wallets (averaging about 50 BTC each), making targeted theft slow and often unprofitable. But whether the practical risk is immediate or not, the broader consensus among Google, the Ethereum Foundation, NIST and many prominent Bitcoin advocates is clear: quantum will eventually threaten the cryptography that underpins blockchains. The real question now is timeline and capacity: is three years enough to migrate a global, decentralized protocol that has no central authority, no unified engineering program, and a culture that treats sudden urgency with suspicion? Bottom line Ethereum says yes — eight years of prep has it ready to roll PQ changes through multiple hard forks. Google is already moving its products and setting a 2029 deadline. Bitcoin, for now, is largely silent and decentralized governance may make a rapid pivot difficult. If that silence continues, proponents warn, market signals such as ETH/BTC could begin to reflect the divergence in prioritization. The clock is ticking. Read more AI-generated news on: undefined/news

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