Bitcoin, Ethereum quantum attack risk falls

For Bitcoin and Ethereum holders, the real economic issue is that both networks rely on secp256k1 signatures. A sufficiently powerful quantum machine could, in theory, derive a private key from a public key once it is exposed, turning a long-running cybersecurity question into a balance-sheet risk for the crypto ecosystem. The paper does not prove an imminent breach, but it compresses the timeline for one of the market’s most important “low probability, high impact” scenarios.

That is why the story reaches well beyond crypto. The harder the industry believes quantum resistance is to postpone, the more pressure there will be on developers to move toward quantumsafe signatures before a real threat materializes. That transition would be costly, technically messy and slow, but the longer it takes, the more the market has to price in a structural overhang on Bitcoin and Ethereum adoption, custody, and exchange infrastructure.

Investors, meanwhile, get a second-order trade: quantum computing stocks. Rigetti, D-Wave Quantum and Quantinuum all received CHIPS Act funding commitments of up to $100 million each from the U.S. Commerce Department in early September, along with minority stakes from the government. That does not make them safe or profitable — far from it — but it does put federal capital behind the very hardware stack that, in a future world, would underpin quantum breakthroughs. For traders, that is enough to keep these names on the radar as high-beta proxies for the race to fault-tolerant machines.

Rigetti is already trading like a speculative option on that future. Its shares closed at $16.52 on Sept. 22, below the 200-day moving average of $18.77 but above the 50-day moving average of $15.98, while the RSI reading of 67 suggests the stock has been firm without yet flashing a full-blown technical blowoff. Bitcoin, by contrast, is still trading with extreme greed in Adalytica’s fear-and-greed snapshot, which is exactly the kind of environment where uncomfortable risk is easiest to ignore.

The market underestimates how quickly this can shift from academic debate to investable theme. If quantum cost curves keep falling and Bitcoin or Ethereum developers sketch a credible migration path to post-quantum signatures, the narrative will move from “not yet” to “must own the picks-and-shovels.” Until then, the asymmetric opportunity sits in the quantum names — but only for investors who can tolerate deep volatility and a very long runway. The actionable takeaway: treat quantum computing as a secular infrastructure theme, not a crypto hedge, and watch for any credible protocol upgrade that forces the market to reprice both Bitcoin risk and Rigetti’s upside at the same time.