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Coinbase is urging Bitcoin developers and users to begin technical work on protections against future quantum-computing threats. The exchange describes migration as a multiyear effort, but says its proposals are input to an open discussion—not a final position, deadline or agreed network upgrade.
Coinbase is urging Bitcoin’s developers and wider community to start preparing for a possible quantum-computing threat, arguing that evaluating new signature protections and moving funds could take years. The exchange’s recommendations are a contribution to an open discussion, not an agreed Bitcoin upgrade or a migration deadline.
In a blog post outlining its technical priorities, Coinbase said a transition would require more than choosing a new digital-signature algorithm. Any approach would also need to work with ordinary wallets and institutional custody systems, keep transaction and verification demands manageable, and account for bitcoin that is abandoned or cannot be moved. Coinbase said it holds about 5% of all bitcoin in existence, and is preparing its own systems while speaking with Bitcoin developers and researchers and supporting open-source work through engineering and participation in the Bitcoin Security Consortium.
The company urged developers to evaluate designs that could protect both already exposed funds and new funds, while allowing signature algorithms to be replaced or supplemented over time. It pointed to P2MR, associated with Bitcoin Improvement Proposal 360, and P2TRv2 as approaches that may offer flexibility. Coinbase said evaluation should examine whether public keys can remain concealed until needed, whether quantum-vulnerable spending routes can be avoided, and whether wallets and exchanges can adopt the resulting address format.
Coinbase called for reproducible testing tailored to Bitcoin, covering transaction size, fees, verification work and the time needed to migrate vulnerable funds. Its suggested candidates include ML-DSA, SLH-DSA and FN-DSA when standardized, as well as other credible options and the hash-based candidate SHRINCS. The post cautioned that systems with smaller signatures or faster verification can carry other tradeoffs, including recordkeeping requirements that may complicate wallet recovery or institutional operations.
Why Bitcoin Needs Lead Time
The concern is a potential future risk, not a claim that quantum computers can currently break Bitcoin’s signatures. Coinbase’s argument is that waiting until such capability is demonstrated could leave too little time for a network-wide response: developers would need to agree on rule changes, wallets and custodians would have to implement them, and holders would need to move funds into protected formats.
The proposed work affects more than cryptography research. Bitcoin’s transaction space is limited, and its network nodes independently verify transactions. A signature scheme that looks suitable in general-purpose testing could impose different costs when used at scale on Bitcoin. At the same time, a technically secure design that is difficult to use or safely recover could slow adoption and leave some funds unmigrated.
Coinbase’s emphasis on inaccessible coins points to a separate governance question: what should happen if an owner cannot or does not transfer funds before any protective change takes effect? The company says that debate should proceed in parallel with engineering. That approach could keep difficult policy questions from holding up technical evaluation, while leaving the eventual treatment of such coins unsettled.
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Bitcoin’s Proposed Migration Work
Bitcoin transactions rely on digital signatures to show that a person authorized spending funds. Public keys are used to verify signatures, while private keys provide the authority to spend. Coinbase’s post discusses the possibility that a sufficiently capable quantum computer could threaten cryptography behind existing signatures, including where public keys have been exposed. It does not say such a machine exists or give a timeline for one.
The exchange frames preparation as a multiyear migration involving shared network rules and fund movement across wallets, exchanges and custody providers. It also argues that Bitcoin-specific testing is needed because signatures are recorded permanently and verified by network nodes; comparisons designed for internet security may not capture those constraints. Coinbase said its post is intended to inform discussion and does not set a final company position.
“Some questions, including how to handle abandoned or inaccessible coins, are difficult and deserve thoughtful debate. In our view, that discussion can continue alongside the technical work to add post-quantum signature support to Bitcoin.”
— Coinbase, in its blog post
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Open Questions on Signatures and Coins
No Bitcoin upgrade has been agreed, and Coinbase has not announced a deadline for migration. The post is not a final Coinbase position. It also does not establish when, or whether, a quantum computer capable of threatening Bitcoin’s current cryptography will be available.
The best signature design remains unsettled. Coinbase’s named proposals and candidate systems are options for evaluation, not a selection endorsed by the Bitcoin community. Their practical costs, wallet compatibility and security tradeoffs require further testing. The policy for abandoned or inaccessible coins is also unresolved, as is how any eventual migration would treat holders who do not move funds.
Coinbase warns that some stateful signature systems require signers to track previously used signing steps; a failure in that recordkeeping could create security problems. The post says blockchain history may not provide a complete remedy if a signature or update was never recorded on-chain. How such risks would be handled across personal wallets and distributed institutional systems remains a matter for technical work.
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Testing Before Any Network Upgrade
Coinbase is calling for reproducible Bitcoin-focused comparisons of candidate signature systems, including measurements of transaction size, fees, node verification demands and migration requirements. The company says it is preparing its own systems and engaging developers and researchers, but has not described a firm timetable or a finalized implementation.
Further progress depends on technical evaluation and discussion among Bitcoin contributors, wallet providers, exchanges, custodians and holders. Any network-level change would require broader agreement and implementation work; the source report does not identify an approved proposal or scheduled decision. The immediate development is therefore a call to begin preparation, with the design and governance choices still open.
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Key Questions
Is Coinbase saying quantum computers can break Bitcoin today?
No. Coinbase is urging preparation for a possible future capability. The post does not say that a machine able to break Bitcoin’s current signatures exists or provide a date for one.
Has Bitcoin approved a quantum-resistant upgrade?
No. Coinbase’s post is an input to an open discussion. It does not announce an agreed upgrade, a selected signature system or a migration deadline.
Which signature systems did Coinbase identify for evaluation?
The company named ML-DSA, SLH-DSA and FN-DSA when standardized, along with other credible candidates and SHRINCS. These are candidates to assess, not systems Coinbase says Bitcoin has adopted.
Why does Coinbase say preparation should start early?
Coinbase says changing Bitcoin’s shared rules and migrating funds could take years. Early testing could give developers and service providers time to examine security, fees, wallet usability and custody requirements before a quantum threat is confirmed.
What happens to abandoned or inaccessible bitcoin?
That remains unresolved. Coinbase says the issue deserves debate but should be discussed alongside technical work, rather than delaying evaluation of post-quantum protections.
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