New research involving Google outlines how quantum computers could one day break the cryptographic security of major blockchains. The paper estimates a system with 1,200–1,450 logical qubits could crack the secp256k1 standard used by Bitcoin and Ethereum within minutes. This reinforces recent efforts by the Ethereum Foundation to prepare a multi-year transition to quantum-resistant cryptography.
New research demonstrates quantum computers could eventually break the elliptic curve cryptography securing blockchains. This includes the secp256k1 standard used by Bitcoin and Ethereum.
The paper estimates such an attack could be completed in as little as 9–12 minutes. This short window targets transactions after they are broadcast but before confirmation.
It also highlights risks to dormant wallets with exposed public keys. These “at-rest” attacks could threaten older holdings if quantum capabilities advance sufficiently.
The findings add urgency to Ethereum’s recently launched post-quantum security roadmap. The foundation outlined a phased migration requiring years of careful coordination.
The network’s complexity from smart contracts and proof-of-stake may present a broader attack surface. This could make standardizing new cryptographic protocols more challenging.
Former Binance CEO Changpeng Zhao stated “no need to panic,” noting blockchains can transition algorithms. He acknowledged decentralized coordination and user migrations would complicate the process.
Beyond protocol upgrades, users will likely need to actively migrate funds to new wallet standards. Industry participants have raised concerns about vulnerable dormant assets, including early Bitcoin holdings.
While not an immediate threat, the research suggests delaying preparation increases long-term risks. The transition emphasizes “cryptographic agility” to enable gradual security upgrades.
