Quantum Threat to Crypto: Post-Quantum Cryptography Plans for BTC & ETH
Coinbase-backed researchers warn the quantum threat to crypto could become significant over time. A new 50-page advisory report says there is no immediate direct risk to Bitcoin (BTC) or Ethereum (ETH), but future fault-tolerant quantum computers could eventually break today’s encryption. The report cites Google research suggesting a quantum computer at the right scale could threaten Bitcoin’s cryptography.
For traders, the key issue is timing and execution. NIST recommends moving to post-quantum cryptography by 2035, but the report argues that schedule may be optimistic. Migration across networks, wallets, and exchanges could take years, with millions of wallets requiring updates. It also flags short-term differences by wallet type: wallets with previously exposed public keys may be more vulnerable.
A major market-relevant metric is performance cost. Adopting quantum-resistant digital signatures could expand blockchain data sizes by up to 38x, raising storage, bandwidth, and processing demands. The report recommends phased “hybrid” migration models that combine current and post-quantum methods during the transition.
Ecosystem actions are already underway. Ethereum teams are exploring quantum-safe signature approaches, while Solana’s teams are developing quantum-resistant wallet protections. Overall, this is a risk-management and infrastructure timeline story—not an immediate catalyst for BTC or ETH price.
Neutral
The report frames a long-horizon infrastructure risk rather than an imminent break of BTC or ETH. It explicitly says there is no immediate direct threat to major networks, so it is unlikely to trigger a near-term repricing based on “encryption is already broken.”
However, it raises credible operational costs and transition friction: post-quantum cryptography migrations could take years and could increase signature and data sizes (up to ~38x), affecting network throughput and user/storage economics. That kind of uncertainty can influence sentiment, but it is not presented as a sudden technical failure—more as a planning roadmap. As a result, the expected price impact on BTC and ETH is best categorized as neutral: traders may see it as a fundamentals/roadmap item, not an immediate bullish or bearish shock.