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Coinbase has urged Bitcoin developers and users to begin evaluating quantum-resistant security before a capable quantum computer becomes a known threat. The exchange says the work could take years and should proceed alongside debate over dormant funds; it has not proposed an agreed upgrade or migration deadline.
Coinbase is urging early technical work on Bitcoin’s potential transition to quantum-resistant signatures, arguing that changing network rules and moving funds could take years. The exchange said the effort should start before a quantum computer capable of breaking Bitcoin’s current cryptography is demonstrated, but stressed that its recommendations are an input to discussion, not an agreed upgrade or migration deadline.
In a blog post setting out technical priorities, Coinbase said the problem involves more than selecting a replacement signature algorithm. Any approach would need to protect funds whose public keys may already be exposed, support security for newly created funds, and work for everyday wallet users, exchanges and institutional custodians. It would also have to fit Bitcoin’s limits on transaction space, fees and verification demands.
The company called for Bitcoin-specific, reproducible comparisons of candidate systems, measuring signature and transaction size, verification work, costs and the time needed to migrate vulnerable funds. It named ML-DSA, SLH-DSA and FN-DSA as systems to assess when standardized, and said the hash-based candidate SHRINCS also merits evaluation. Coinbase also pointed to proposed spending formats associated with P2MR and Bitcoin Improvement Proposal 360, as well as P2TRv2, as designs that could offer flexibility to add or replace signature systems. These are candidates for evaluation, not adopted Bitcoin changes.
Coinbase highlighted practical risks in signature systems that require signers to keep track of prior signing steps, known as stateful systems. It said a lost record, failed update or old wallet backup could create security problems, and that checking blockchain history might not resolve them if a signing step never appeared on-chain. Exchanges face additional complexity coordinating signing systems across distributed servers. Coinbase said it holds about 5% of all bitcoin in existence and is preparing its own systems, talking with developers and researchers, and contributing engineering resources and participation through the Bitcoin Security Consortium.
Why Bitcoin Needs Lead Time
Bitcoin’s security depends on digital signatures that show a transaction was authorized by the holder of the relevant secret key. Coinbase’s concern is that a sufficiently capable quantum computer could undermine the cryptography behind existing signatures, potentially putting some funds at risk, particularly where public keys are exposed. The company has not said such a machine exists or set a date for when one might become practical.
Preparation could involve coordinated software and network-rule changes, wallet updates and fund movement across a system used by individuals, businesses and custodians. A design that is secure in a laboratory may still be difficult or costly to use at Bitcoin’s scale. Early testing, Coinbase argues, gives developers time to compare trade-offs without presenting the threat as imminent or requiring an immediate migration.
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How Coinbase Frames the Migration
Digital signatures let Bitcoin nodes check that a transaction was authorized without revealing the private key used to spend the funds. Public keys are used to verify those signatures; private keys authorize spending. Coinbase’s post focuses on how Bitcoin might adopt protections designed to withstand quantum attacks while keeping transaction verification practical.
The company’s recommendations also address a governance question: what to do about coins whose owners cannot or will not move them. Coinbase said that issue deserves careful debate but should not hold up technical work on post-quantum signature support. Its post does not settle the treatment of dormant or inaccessible coins, and it does not establish a community-approved migration path.
“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 Security and Funds
No quantum threat timeline is established in the post, and the material does not show that a machine capable of breaking Bitcoin’s current cryptography is available. The relative performance and practical security of the candidate signature systems in Bitcoin use also remain subjects for testing; Coinbase’s list is a proposed evaluation set, not a final selection.
It is also unresolved how any change would be approved and implemented across Bitcoin, how funds that remain in older formats would be treated, and what migration process would be workable for users and institutions. Coinbase did not announce a deadline, a finalized technical design or a network-wide plan.
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Evaluation Before Any Upgrade
Coinbase says it is preparing its own systems and continuing discussions with Bitcoin developers and researchers, while supporting open-source work through engineering and the Bitcoin Security Consortium. The next steps described in its post are technical evaluation and ongoing community discussion, rather than a scheduled protocol change.
Readers should watch for published comparisons of candidate signatures under Bitcoin-specific conditions, further developer proposals and debate over how to migrate funds. The source post does not identify a date for those milestones or say when the Bitcoin community might reach agreement.
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Key Questions
What is Coinbase asking the Bitcoin community to do?
Coinbase is urging developers and other participants to start evaluating quantum-resistant signature systems and the practical steps required for a possible migration, rather than waiting for a quantum threat to be demonstrated.
Has Bitcoin approved a post-quantum upgrade?
No. Coinbase describes its post as an input to open discussion. It does not announce an approved Bitcoin upgrade, a final choice of signature system or a migration deadline.
Which signature systems does Coinbase say should be evaluated?
The post names ML-DSA, SLH-DSA and FN-DSA for evaluation when standardized, and also identifies SHRINCS as a candidate. Coinbase has not selected one as Bitcoin’s replacement system.
Why does Coinbase say the work should start early?
The company says changing network rules, updating wallets and moving funds could take years. It also wants time to test transaction costs, verification demands, usability and institutional custody requirements.
What is unresolved about dormant bitcoin?
The community has not decided how to treat coins whose owners cannot or will not move them to a new format. Coinbase says that question deserves debate but can be discussed alongside technical preparation.
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