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Crypto

Bitcoin private key could be stolen in 9 minutes after public key exposure, Google quantum paper shows

A paper by Google Quantum AI outlines specific quantum-computing attack scenarios targeting Bitcoin’s secp256k1 elliptic-curve cryptography. It estimates that after a Bitcoin public key is exposed, a quantum computer could take about 9 minutes to calculate the corresponding private key, aided by precomputing fixed curve parameters. The paper describes two quantum circuit designs requiring 1,200 to 1,450 logical qubits and tens of millions of T gates, with fewer than 500,000 physical qubits.

Crypto

Adam Back says Bitcoin must prepare quantum-resistant shift; Satoshi holdings could be estimated

Bitcoin could reveal how much bitcoin Satoshi Nakamoto can actually access if it shifts to a post-quantum system, a claim has emerged. Blockstream CEO Adam Back (아담 백) said the safest approach is to design an optional upgrade that allows a move to quantum-resistant cryptography if needed. That shift could help gauge the effective size of Satoshi-linked holdings. Separately, a proposal to restrict movement of quantum-vulnerable coins has drawn criticism as confiscatory.

Crypto

Why bitcoin held up despite quantum computing fears, Bernstein says risk already priced in

Bernstein said the bitcoin market has already priced in a range of risks, including quantum-security worries, pointing to a roughly 50 percent fall from its October 2025 record high. The view follows recent Google research suggesting future quantum computers could break elliptic-curve cryptography in some blockchain designs. Bernstein said Bitcoin Core developers still have time to choose a post-quantum upgrade path. Others said the main challenge is social adoption, including moving users to new standards.