Revealing the $250 billion strategic layout that Coinbase is managing in response to the post-quantum era

Coinbase is developing anti-quantum host protection to support multiple signature schemes

Yehuda Lindell, the head of Coinbase , said that the company is developing a post-quantum era hosted security protection to support many different signature schemes.

Traditional multiparty computing relies on key fragmentation techniques, but many post-quantum signature schemes may not be friendly to MPCs.

To this end, Coinbase is exploring an alternative architecture that combines post-quantum gate restriction decryption with a security module (HSM) capable of programming .

Lindel points out that if quantum computer with the actual ability to break in eventually poses a realistic threat to Bitcoin 's security, Coinbase hopes it will be prepared ahead of time no matter which direction Bitcoin , and other digital asset evolve.

Recently on the MARA Foundation TV show, Lindell revealed to host Isabel Foxen Duke that the company's post-quantum protection design aims to be compatible with any possible future technology routes. At present it is uncertain what kind of post quantum signature scheme Bitcoin will actually use.

Speaking about the standards that networks will eventually adopt, Lindel said: "It's unlikely there is a single signature scheme used by everyone. That means we have to be prepared for different outcomes on different blockchain ".

Coinbase manages approximately $250 billion in assets for institutions such as BlackRock ( BlackRock ), and has been refining its processes over the years. Today, the company is tackling a possibility: Multilateral calculation of MPCs - an important cornerstone of the current system - will become more difficult to implement even under Bitcoin scenarios.

The functionality of the MPC is similar to that of Bitcoin 's multisig mechanism, which allows multiple parties to each hold different slices of private key and for multiple signatories to execute transactions together without exposing the complete 880011 on any single device.

The native scripting language of Bitcoin allows the user to directly construct a scheme for multisig in on-chain using regular number rules, while MPC runs on off-chain with specific functions such as cryptography . Since signing a transaction requires aligning a certain number of key fragments, complete keys are never stitched together anywhere, effectively eliminating the risk of single point failure.

However, as Bitcoin moves into the post-quantum era, experts are increasingly concerned that not all post quantum signature schemes will be compatible with MPCs. In particular, hash-based signatures may lack an underlying algebraic structure allowing for traditional key fragmentation. The absence of this mathematical structure is precisely why hashed signatures have been deemed immune to quantum threats but also makes them difficult to use in building up MPC infrastructures.

Lindel explains that there is a huge difference between being friendly or unfriendly to MPC. Until recently, it was also thought that hash-based signatures could not run on MPCs. Top cryptography companies such as Dan Boneh are actively working on feasible solutions and this has been elaborated in the recent paper published by PRAWNS.

Wallet developers, including Ledger's CTO Charles Guillemet, have expressed similar concerns about hash signatures.

Alternative schemes at the level of hardware

If Bitcoin eventually adopted a post-quantum scheme that was incompatible with the MPC, Coinbase is working on an alternative architectural stack centered around the programming hardware security module ((HSM), which is a digital vault deployed in private data center for storing encryption keys.

Under this architecture, private key is encrypted by the later quantum cryptography , and can only be assembled inside a physically protected HSM.

Although storing the complete key in a vault for even short periods of time is not as secure in theory as traditional MPCs, HSM can still provide strong protection under these constraints. Lindell notes that HSM's strict physical side-channel security and code upload control give him confidence about this solution:

Given the uncertainty of Bitcoin 's potential post-quantum upgrade path, Lindel said that Coinbase is designing its hosting architecture in a form independent from specific schemes to accommodate any signature scheme that may be adopted by Bitcoin , over the next few years.

Although the timeline for a post- Coinbase quantum security system has yet to be determined, Lindell adds that once it is built I will be able to say: "I can support any scheme". We won't worry about some blockchain deciding to adopt something we cannot.