Quantum Threat to Bitcoin: Most Coins Safe, Bernstein Finds
Quantum Threat Looms but Bitcoin’s Core Stays Safe
Bitcoin is not about to be broken by quantum computers, according to a new Bernstein analysis. The report argues that any near-term risk is limited to older wallets holding exposed public keys, while the vast majority of coins remain shielded behind hashed addresses that current quantum machines cannot efficiently crack.
Quantum computing has long been cited as a theoretical doomsday scenario for Bitcoin because Shor’s algorithm could, in theory, derive private keys from exposed public keys. Bernstein’s team points out that most modern wallets never broadcast the public key until coins are spent, so the attack surface stays small. They estimate the network has a three-to-five-year window to upgrade signature schemes if quantum progress accelerates.
The analysts single out lost coins in Satoshi-era addresses and any keys reused across multiple transactions as the primary targets. These holdings represent only a modest slice of supply, but a successful attack on them could still spark headline risk and short-term volatility if exploited.
What This Means for Crypto
Quantum resistance is mainly a cryptography upgrade rather than a fundamental rewrite of Bitcoin’s monetary rules. Soft-fork proposals already circulating in developer circles would introduce post-quantum signature schemes without forcing users to move funds immediately.
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