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The debate around quantum computing and Bitcoin has grown louder, but the latest analysis argues that the threat is being overstated in the near term. Galaxy Research says the risk is genuine because a sufficiently powerful quantum computer could, in theory, derive private keys from exposed public keys and forge valid signatures. Even so, that would not put every bitcoin wallet in danger overnight, and it does not mean the network is on the verge of collapse.
The key distinction is which coins are actually exposed. Galaxy notes that most wallets are not vulnerable today because the danger applies mainly to coins whose public keys are already visible onchain, such as older legacy outputs, reused addresses, some custodial setups, and long dormant early-era holdings. Project Eleven’s estimate, cited in Galaxy’s report, suggests roughly 7 million BTC could fall into a broad “long exposure” category, though other estimates come in lower depending on how exposure is defined.
That is why the issue is being framed as a migration and governance challenge, not an existential crisis. Bitcoin still relies on elliptic-curve signature schemes like ECDSA and Schnorr, which would be vulnerable to Shor’s algorithm if a cryptographically relevant quantum computer ever arrives. But Galaxy argues that the real bottleneck is not present-day exploitation, since no publicly known machine today is capable of that attack at scale. The harder question is whether the Bitcoin ecosystem can coordinate a post-quantum transition early enough, because network-wide upgrades take years, not weeks.
There is also more active preparation underway than some critics suggest. Galaxy points to ongoing work around mitigation paths such as BIP 360, Hourglass, hash-based signature approaches, and other post-quantum migration ideas already being discussed in the developer community. Bitcoin Optech has also highlighted active discussion around Falcon-style post-quantum signatures, even while noting the tradeoffs, including much larger onchain footprint than today’s signatures.
Seen from a wider perspective, Bitcoin is hardly alone here. NIST finalized its first post-quantum cryptography standards in August 2024 and has been urging organizations to begin the transition process, which shows that the quantum problem extends well beyond crypto into mainstream digital security. In that context, Galaxy’s message is essentially that Bitcoin has a real long-term vulnerability, but also time, tools, and an active technical community working on defenses. The danger is serious enough to justify preparation, but not close enough to justify panic.
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