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There is no single qubit count to break Bitcoin secp256k1. The real question is logical qubits, error correction, and whether the attack fits the time window.
There is no single agreed number of logical qubits to break Bitcoin ECDSA. The answer depends on error correction, runtime, and public key exposure.
By 2026, quantum computers are unlikely to directly break Bitcoin ECDSA, but exposed public keys are the real part of the risk to understand.
Quantum computers are unlikely to break Bitcoin in 2026. The real issue is whether Shor’s algorithm can target exposed public keys in time.
Quantum computers could threaten Bitcoin’s ECDSA in theory, but that does not mean a break is guaranteed by any given year. Public key exposure matters.
