Quantum Computers Pose Cryptocurrency Security Risk

A recent study by Google Quantum AI has sparked concern about the potential for quantum computers to break certain types of cryptocurrency encryption. However, experts emphasize that this is not an immediate threat.

The research, published in March 2026, estimated that it would require around 500,000 physical qubits to breach the security of Bitcoin and Ethereum. This is significantly lower than previous estimates, but still far beyond the capabilities of existing technology.

The study's authors used a rigorous resource estimate for solving the elliptic curve discrete logarithm problem (ECDLP) on secp256k1, which secures Bitcoin, Ethereum, and most cryptocurrency wallets. The result is a tighter bound on the number of qubits an attacker would need, but it does not provide a timeline for when such a machine will exist.