How long until Bitcoin is broken by quantum computers? Google reveals the cracking threshold has dropped 20 times, experts worry governance crisis could be a fatal flaw

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The quantum crisis of Bitcoin is no longer science fiction! The latest white paper from Google Quantum AI indicates that the threshold for cracking Bitcoin has dropped significantly to 1,200 logical qubits, with quantum hardware expected to reach this milestone by 2033. Experts warn that the real crisis is not physics, but the extremely conservative "governance mechanism" of the Bitcoin community. To upgrade to post-quantum cryptography, network throughput may be halved and transaction fees could triple. This consensus battle, which concerns the survival of Bitcoin, may require a tug-of-war lasting up to 10 years. Satoshi Nakamoto’s early stash of one million BTC may become the first wave of lambs to the slaughter. (Previous coverage: Bitcoin vs. Quantum》AmericanFortress calls for a soft fork to freeze Satoshi Nakamoto’s 1.1 million BTC to protect against quantum attack threats) (Background supplement: The Trump administration invests $2 billion in "quantum computing"! Stakes in 9 major companies including IBM, with concept stocks surging up to 25% in pre-market trading) How far are we from the day Bitcoin is compromised? The answer may be closer than most people imagine. According to a groundbreaking white paper released by Google Quantum AI in March 2026, by optimizing the Shor algorithm, cracking the 256-bit Elliptic Curve Cryptography (ECDSA) that protects every Bitcoin address requires no more than 1,200 logical qubits and fewer than 500,000 physical qubits. This figure is a full 20 times lower than the industry consensus estimate from five years ago. Comparing the quantum development roadmaps of major tech giants: IonQ aims to reach 1,600 logical qubits by 2028; IBM expects to launch the Blue Jay system with 2,000 logical qubits in 2033. This means that Bitcoin’s "quantum countdown timer" could hit zero by 2033 at the latest. This crisis consists of three levels. First, state-level intelligence agencies may already be executing a "Harvest Now, Decrypt Later (HNDL)" strategy. Any private transactions or cross-chain messages built on the blockchain that are intercepted and stored now can be easily decrypted when quantum computers mature in the future. Second, the most lethal blow will strike precisely at legacy addresses with "exposed public keys." The most dangerous targets are the millions of BTC mined by Satoshi Nakamoto in the early days, which are worth a fortune. These addresses, using the early P2PK format, have had their public keys exposed on the chain for 17 years. Once a cryptographically relevant quantum computer is available, these unclaimed fortunes, which no one can move, will become the primary target for hackers. Even more chilling is the "instant replacement attack." When you initiate a transaction in the future, during the 10-minute waiting period before block confirmation, a powerful quantum computer could derive your private key from your broadcasted public key and hijack the funds before the transaction settles. Facing the quantum threat, technical solutions already exist. NIST (National Institute of Standards and Technology) finalized the Post-Quantum Cryptography (PQC) standards as early as 2024. However, the real bottleneck is: is the Bitcoin network willing to pay the high price for an upgrade? Studies show that the data size of post-quantum signatures is hundreds of times larger than current ones. If a full transition to the new standard occurs, Bitcoin network throughput would plummet by 52% to 57%, and transaction fees would soar by 2 to 3 times. This is a "defensive degradation"; users must immediately bear high costs in exchange for protection against a threat that has not yet materialized. Looking back at history, the SegWit upgrade, which brought substantial performance improvements, triggered a two-year split and civil war within the Bitcoin community. Today, pushing an anti-quantum upgrade (such as the currently proposed BIP 360 and BIP 361) that significantly reduces performance in this extremely anti-centralized and conservative community is estimated to take 10 to 15 years to reach consensus—which perfectly overlaps with the countdown to the quantum threat. In contrast, Ethereum founder Vitalik Buterin has already personally promoted a multi-layered quantum emergency roadmap, even allowing accounts to independently switch to post-quantum signatures. Experts warn that Bitcoin will not go to zero instantly, but its path to survival will be extremely narrow. This race is no longer a duel between quantum computing and cryptography, but whether the development speed of quantum hardware can be outpaced by the "governance capacity" of the Bitcoin community to make difficult collective decisions under pressure.

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