In a Nutshell
- Companies are developing quantum-resistant wallets in preparation for blockchain upgrades.
- Various strategies are being implemented, from MPC enhancements to layer-2 overlays.
- Experts highlight user behavior and coordination as potential weak points in the rollout of quantum upgrades.
Cryptocurrency firms are proactively fortifying their wallet and custody services against potential threats from quantum computing. The goal is to enhance user-facing infrastructure at a quicker pace than blockchain protocols can evolve.
This shift underscores the belief that network-wide modifications to blockchains like Bitcoin and Ethereum could be a lengthy process, leaving wallets vulnerable in the interim. The looming threat of “Q-Day” to the crypto industry may arrive sooner than anticipated, with predictions suggesting as early as 2030.
One company at the forefront of incorporating post-quantum security into crypto wallets is Silence Laboratories. The firm has integrated support for distributed—specifically multi-party computation (MPC)—signatures utilizing ML-DSA, a cryptographic algorithm sanctioned by the National Institute of Standards and Technology (NIST).
Jay Prakash, CEO and co-founder of Silence Laboratories, explained that their efforts align with recent advancements in post-quantum cryptography, such as NIST’s approval of three algorithms: SPHINCS+, Falcon, and CRYSTALS-Dilithium.
Prakash noted that the company spent six months evaluating these algorithms for distributed signing systems utilized by custodians and institutional wallets.
“Not all of SPHINCS+, Falcon, and CRYSTALS-Dilithium will meet the criteria of multi-party computation (MPC) friendliness—whether they support efficient distributed transaction signing—and a potential fragmentation has to be factored in too, because each chain is picking a different scheme with its own optimization criteria, signature size, or compute efficiency,” Prakash stated.
The core concept involves generating key shares across isolated nodes, enabling a joint signature without reconstructing the key. This approach serves as a defense against the potential threat posed by quantum computers, which are projected to compromise current cryptography in a matter of years. Prakash emphasized that businesses recognize the imperative for such measures.
“Institutions are now gravitating towards distributed signing,” he remarked. “Whether it’s a partner like BitGo or a bank establishing a digital asset division, they all acknowledge that keys cannot be centralized.”
MPC systems distribute private keys across multiple devices, a standard setup for custodians and institutional wallets. Silence Laboratories’ strategy is tailored to seamlessly integrate within this existing framework, enabling firms to upgrade without altering their operational systems.
“Any bank or custodian equipped with MPC infrastructure can seamlessly transition to a post-quantum MPC-based wallet without overhauling their existing setup,” Prakash assured. “It’s a straightforward code upgrade. Subsequently, they possess a post-quantum-secure signing layer.”
This upgrade is implemented at the wallet level, negating the need for user intervention.
“Through a post-quantum wallet SDK, institutions receive a seamless upgrade path on their current infrastructure,” Prakash elaborated. “No extensive architectural changes—they already utilize MPC. Developers can simply update the algorithm in the library, offering end-users—whether on platforms like MetaMask or others—the same experience, now fortified with post-quantum security.”
The divergence in the industry’s approach to quantum risk is evident. While some developers concentrate on wallet-level enhancements, others contend that comprehensive protection for users necessitates protocol-level alterations to the crypto networks themselves.
Alternative strategies are also being explored to address the challenge. Developers behind a wallet from Postquant Labs are designing a system that overlays quantum-resistant signatures onto Bitcoin using a distinct smart contract layer, sidestepping modifications to the core protocol.
Similar concepts have been proposed, including the work of StarkWare researcher Avihu Mordechai Levy, who proposes replacing Bitcoin’s elliptic-curve cryptography with hash-based signatures conforming to the network’s existing rules. This approach is considered a “last-resort” measure rather than a scalable solution, potentially incurring significant costs.
However, the crux of the matter is timing. While quantum computers capable of breaching current encryption are not currently operational, recent advancements have heightened concerns regarding the timeline. This uncertainty is propelling companies to take preemptive action, although the efficacy of wallet-level remedies is constrained.
“If wallets are upgraded to post-quantum and chains are not upgrading,” Prakash warned, “it won’t suffice.”
