Bitcoin faces quantum risk as PsiQuantum starts build

What to Know:

• PsiQuantum initiates million-qubit build, signaling progress toward large-scale quantum computing.
• Company explicitly states no intention to attack Bitcoin with quantum capability.

Construction has begun on a Chicago facility designed to house a one‑million‑qubit quantum computer, according to TLT.ng. The project advances PsiQuantum’s effort to deliver a large‑scale, fault‑tolerant machine.

The announcement drew immediate attention from digital‑asset observers who track potential cryptographic impacts. Company communications around the launch included reassurances about cryptocurrency security considerations.

Why it matters for Bitcoin’s cryptography and near‑term risk

Breaking Bitcoin’s signatures would require a fault‑tolerant machine with sufficient error‑corrected, logical qubits, not merely a high count of noisy, physical qubits. According to IEEE Spectrum, millions of additional qubits are typically needed for error correction, and a million physical qubits alone would not be cryptographically decisive for running Shor’s algorithm at scale.

Against that backdrop, PsiQuantum said it has "no intention of attacking Bitcoin." That stance aligns with technical assessments that the path from headline qubit counts to cryptographically relevant capability remains long and complex.

As reported by Tekedia, Bitcoin cryptographer Adam Back views the quantum threat as not near‑term, estimating on the order of 20–40 years before a cryptographically relevant attack is plausible. The same reporting notes he has emphasized Bitcoin’s ability to adapt via soft‑fork mechanisms to introduce post‑quantum signature schemes if and when needed.

Bitcoin exposure today and post‑quantum migration paths

Based on CoinShares research, roughly 10,230 BTC are immediately vulnerable today due to legacy addresses with already‑exposed public keys. In contrast, modern usage patterns typically avoid exposing public keys until spend time, limiting active attack surface.

In practice, near‑term mitigation centers on moving funds from legacy outputs and continuing the industry shift to address types that minimize public‑key exposure. Over the medium term, protocol work could introduce post‑quantum signatures through standard upgrade paths once trade‑offs in size, speed, and security are acceptable.

Other analyses, as reported by Forbes, cite larger headline figures for potentially at‑risk holdings, often reflecting dormant or lost coins. The divergence underscores that aggregate exposure depends on address type, key‑exposure status, and on‑chain activity patterns.

At the time of this writing, Bitcoin (BTC) traded near $71,287 with sentiment described as Bearish and volatility around 3.86% (medium). Technical context shows RSI(14) near 55.73 (neutral), with the 50‑day SMA at $76,546 and the 200‑day at $96,527.