A new proposal from BitMEX Research has introduced a conditional approach to one of Bitcoin’s most contentious technical debates: how to respond to a future quantum computing threat without prematurely restricting user funds.
The research team outlined a “canary” mechanism that delays any network-wide freeze of vulnerable coins until there is verifiable proof that a quantum computer can break Bitcoin’s cryptography. The idea stands in contrast to a separate proposal, BIP-361, which sets a fixed timeline for phasing out older signature systems and freezing funds that fail to migrate.
BitMEX Research framed the proposal as a way to avoid drastic action before a real threat emerges.
“Mitigating the impact of the freeze using this type of system may be worth consideration,” the group wrote in its report.
Canary fund would act as early warning signal
At the center of the proposal sits a specially constructed Bitcoin address. The address uses a “Nothing-Up-My-Sleeve Number” system. This design ensures that no one knows the private key, while the address remains valid on the network.
Users could send Bitcoin into this address as a bounty. Any entity with a quantum-capable system could attempt to unlock it. If the funds move, the transaction would serve as public, on-chain proof that quantum decryption has moved from theory to reality.
Such an event would trigger a soft fork that restricts or freezes vulnerable coins across the network. Until that moment, older wallets could continue to operate without forced migration.
The proposal describes this phase as a “canary watch state.” It replaces a rigid deadline with a reactive trigger tied to observable evidence on the blockchain.
Conflict grows with fixed-timeline proposal
The debate has intensified after the introduction of BIP-361, titled “Post Quantum Migration and Legacy Signature Sunset.” The plan proposes a structured rollout. It would block new transactions to older addresses after three years. It would then freeze unmigrated coins after five years.
Jameson Lopp, a co-author of the proposal, acknowledged concerns from the community.
“I know folks don’t like it. I don’t like it myself. I wrote it because I like the alternative even less,” he wrote.
Thoughts on BIP-361:
— Jameson Lopp (@lopp) April 15, 2026
* I know folks don't like it. I don't like it myself. I wrote it because I like the alternative even less.
* It isn't a spec, nor is it proposed for activation. It's a rough idea for a contingency plan that needs more R&D.
* I hope it never needs to be…
Critics argue that a forced freeze undermines Bitcoin’s core principle of user control. Bitcoin has historically avoided protocol changes that revoke access to funds held by private key owners. The canary approach attempts to preserve that principle by allowing activity to continue unless a clear threat emerges.
Safety window introduces additional layer
BitMEX Research also proposed a “safety window” to reduce the risk of silent attacks. Under this model, transactions from vulnerable addresses could still occur, but the outputs would remain temporarily locked.
The lock period could vary. The research mentions options that range from a single block to as many as 50,000 blocks, which equals roughly one year. If the canary triggers during that window, those funds would freeze retroactively.
This mechanism aims to increase the cost of stealth attacks. A malicious actor would face the risk that another entity triggers the canary before the lock expires, which could render stolen funds unusable.
The design introduces trade-offs. A longer safety window increases protection but delays normal usability. A shorter window improves usability but reduces the buffer against coordinated attacks.
Incentives and risks shape the proposal
The canary system relies on incentives. Contributors can place Bitcoin into the bounty address without permanent loss. A multisignature structure allows them to withdraw funds at any time.
This setup creates a financial reward for any entity that proves quantum capability in a transparent way. It assumes that a well-funded or regulated organization may choose a public demonstration over covert theft.
The assumption carries risk. A quantum-capable actor could ignore the bounty and target other wallets instead. The proposal acknowledges this limitation. It presents the canary as a mitigation tool rather than a guaranteed defense.
Data referenced in the debate shows that about 34% of Bitcoin’s supply sits in addresses that have exposed public keys on-chain. These funds face theoretical risk if quantum systems advance to a level that can derive private keys from public data.
Industry context shapes urgency
The discussion illustrates broader developments in cryptography and computing. As HodlFM reported earlier, Research from Google suggests a reduction in the resources required to break modern encryption. The company has pointed to a potential migration timeline near the end of the decade.
This timeline places pressure on Bitcoin developers to prepare without undermining the network’s design principles. The canary proposal attempts to bridge that gap. It offers a path that reacts to confirmed threats rather than predicted ones.
Complex trade-offs remain unresolved
BitMEX Research acknowledged that its approach introduces more complexity than a simple freeze. The same applies to other quantum-resistant upgrade paths discussed in earlier work. Each option carries operational and philosophical trade-offs.
The report states that a full freeze could impose significant disruption across the network. The canary system seeks to reduce that impact, even if it introduces uncertainty.
The outcome of this debate will shape how Bitcoin balances security with user autonomy. Developers must decide whether to act on forecasts or wait for proof. The canary proposal places that decision point on the blockchain itself, where any breakthrough would become visible in real time.
Tanya Petrusenko
Disclaimer: All materials on this site are for informational purposes only. None of the material should be interpreted as investment advice. Please note that, despite the nature of much of the material created and hosted on this website, HODL FM operates as a media and informational platform, not a provider of financial advisory services. The opinions of authors and other contributors are their own and should not be taken as financial advice. If you require advice, HODL FM strongly recommends contacting a qualified industry professional.
