Coinbase is urging Bitcoin developers and the wider ecosystem to begin preparing for quantum-resistant security, warning that changing the network and moving funds to new protection systems could take years.
The exchange, which says it holds roughly 5% of all Bitcoin through its custody operations, set out its recommendations in a blog post published Tuesday. According to Decrypt, Coinbase argued that waiting until a sufficiently powerful quantum computer exists would leave the network too little time to respond.
The issue is not an immediate report of a successful attack. It is a potential weakness in the cryptography that protects Bitcoin wallets. A quantum computer powerful enough to break Bitcoin’s current signature protections could, in theory, use an exposed public key to derive its corresponding private key. That could allow an attacker to spend funds from affected addresses. The industry often refers to the point at which such a machine becomes capable of this as “Q-Day.”
Coinbase’s central argument is that Bitcoin cannot treat quantum migration as a last-minute software update. Changes to the network’s rules require broad coordination among developers, miners, wallet providers, exchanges, custodians and users. The movement of existing assets to new address or signature systems would also need to take place across a large and varied ecosystem.
Coinbase’s proposed technical direction
The exchange presented its ideas as a set of requirements and preferences rather than a binding instruction for Bitcoin’s developers. It said any solution should address both existing coins and Bitcoin created after a quantum-resistant upgrade, while also working within the network’s limited block space.
One option Coinbase supported is a flexible “container” design, including proposals such as BIP-360. The basic idea is to create a structure that can accommodate different post-quantum signature systems over time. That could allow the network to replace or update quantum-resistant methods without requiring a complete redesign each time the technology changes.
Coinbase also proposed a staged “1-of-2” spending arrangement for the transition period. Under that model, the same funds could be spent using either a conventional key or a quantum-safe key. Such an approach would be intended to give users and institutions a path to move gradually from existing security arrangements to new ones.
Compatibility with multi-party computation, or MPC, was another condition highlighted by the exchange. MPC divides control of a private key among multiple parties or components, rather than keeping the complete key in one place. Coinbase said a quantum-resistant system would need to work with this type of custody technology, which it relies on to protect assets from theft.
Dormant coins create a separate governance problem
The most difficult part of the transition may involve coins that cannot be moved through a normal migration process. Coinbase specifically identified dormant and lost holdings, as well as coins associated with the Satoshi era, as a separate governance issue.
Those holdings could include coins whose owners are unavailable, have lost access, or have chosen not to move them. Any decision about how to handle such assets would raise questions beyond cryptographic engineering, including who could authorize a rescue mechanism and under what rules.
Coinbase cautioned that a mechanism designed to recover or protect those coins would itself have to be quantum-safe. Otherwise, an attacker who can obtain or exploit an exposed public key could potentially use the recovery process against the very funds it was intended to secure. The exchange did not present a final governance solution in the material provided.
Coinbase’s wider quantum-security push
The latest call extends Coinbase’s previous work on the issue. The company convened a quantum advisory board in January to examine the risks and develop guidance. In July, it joined a Bitcoin Security Consortium with BlackRock and Strategy. The group pledged a combined $15 million toward efforts to make Bitcoin resistant to quantum threats.
Coinbase’s warning reflects the long lead time it believes would be required for consensus changes and ecosystem migration. Its position is that developers should begin the technical and governance work before there is certainty that a cryptographically relevant quantum computer has been built. The company said that once such a system is announced, the remaining time to protect exposed funds could be insufficient.
Market picture
Moneyiar market data at 21:34 on October 15, 2026, showed Bitcoin at $82,165.875435765, up 0.4% over 24 hours and 0.68% over seven days.
Quant was priced at $207.2468383928, with a 24-hour gain of 0.01% and a seven-day decline of 13.04%. AKEDO stood at $0.0330332896, up 23.99% over 24 hours and 24.45% over seven days. BAS was at $0.0203432419, down 0.89% in 24 hours and 6.71% over seven days.
The market figures describe current trading movements; they do not indicate that a quantum attack has occurred or establish how investors will respond to Coinbase’s proposal.
