Quantum Attack Requires 2^128 Ops, Easing BlackRock Bitcoin ETF Security Fears
Analysis shows that applying Grover’s algorithm to bitcoin’s 256-bit SHA-256 would still require about 2^128 quantum operations, keeping bitcoin private keys secure for decades. Fault-tolerant quantum computers with billions of qubits—needed to run such computations—are not expected for at least 20 years, reducing a key risk to BlackRock’s prospective spot Bitcoin ETF.
1. Quantum Threat Assessment
Experts estimate that Grover’s algorithm could reduce bitcoin’s theoretical SHA-256 security from 256 bits to an effective 128 bits, but that still demands roughly 2^128 quantum operations to discover a private key. This level of computation remains far beyond both current and near-term quantum hardware capabilities.
2. Hardware Requirements And Timeline
Achieving 2^128 operations would require fault-tolerant quantum machines with billions of physical qubits and advanced error correction, technologies likely at least two decades away. Current quantum prototypes lack the scale and stability to pose an imminent threat to bitcoin’s cryptographic safeguards.
3. Implications For BlackRock’s ETF
With the quantum threat deferred for decades, investor concerns over the security of bitcoin holdings in BlackRock’s anticipated spot Bitcoin ETF are alleviated. This extended runway boosts confidence in the durability of crypto assets under BlackRock’s management, supporting ETF adoption plans.