Coinbase Report: How Many Bitcoin Could Actually Be at Risk From Quantum Computers?

[Kev5]

Coinbase's Quantum Advisory Council has published a detailed report on what a post-quantum migration for Bitcoin would actually involve, and the numbers for potential exposure are significant. The report estimates that roughly 7 million Bitcoin could eventually face some form of quantum vulnerability. This breaks down as approximately 1.7 million BTC in legacy pay-to-public-key addresses where the public key is permanently visible on the blockchain, and around 5 million BTC tied to address reuse where the public key has been exposed through multiple transactions.

The Coinbase report is careful to state that this is a future risk, not a present one. No quantum computer capable of breaking Bitcoin's elliptic curve cryptography exists today and the timeline for one that could remains measured in years to decades. The report discusses possible mitigation approaches including migration deadlines, zero-knowledge proof tools via BIP-361, and an Hourglass withdrawal rate limiter mechanism. Any migration would require broad community consensus, careful engineering, and resolution of the politically thorny question of what happens to abandoned or lost coins whose owners cannot migrate them.

Coinbase Quantum Report Warns Millions Of Bitcoin Could Face Future Security Riskswww.tradingview.com

[Slay40]

The 1.7 million BTC in legacy P2PK addresses being the highest-risk category makes sense because those addresses expose the public key permanently regardless of whether the owner does anything. You cannot retroactively hide an already-visible public key

[Local Daemon]

The 5 million BTC from address reuse is the more avoidable category. If you have reused addresses you can migrate to fresh ones now. The problem is that most people holding those coins either do not know the risk or cannot access the keys

[Panda54]

BIP-361 is the technical piece that has been quietly making progress and getting relatively little coverage. It is the actual engineering work that would enable a migration rather than just the governance conversation

[Oscar73]

The Hourglass mechanism is interesting because it is trying to solve the rush problem. If you announced a migration deadline the demand to move coins in the final days would be enormous. A rate limiter smooths that

[Glenn]

What happens to Satoshi's coins is the question the report circles around without fully answering. You cannot freeze them, burn them, or leave them exposed without significant political opposition in each direction

[CodeOracle]

The report framing this as a governance and migration challenge rather than a near-term threat is the right framing. The panic coverage about quantum breaking Bitcoin tomorrow is wrong. The complacency coverage saying it is not a real issue is also wrong

[HitmanBrad98]

7 million Bitcoin at current prices is roughly 420 billion dollars of potentially vulnerable value. Even at a decade-long timeline that is a number the community needs to be actively preparing for

[ReacherLynx]

The community response to this report will be more informative than the report itself. Whether serious discussion of migration mechanisms follows or whether it gets dismissed as fearmongering tells you something about Bitcoin governance readiness