Digital assets are entering a security transition that cannot be solved by changing one wallet or rewriting one blockchain. QuFi’s new verification platform takes a different route: place an independent post-quantum verification layer between a transaction instruction and final settlement.
Key points:
- QuFi separates transaction verification from blockchain settlement, allowing existing settlement networks to remain in place.
- Its uBTC proof of concept is running on Bitcoin Testnet4 and verifies BTC collateral before value is issued or moved.
- The platform uses ML-DSA-65, SLH-DSA, and ML-KEM-1024 for post-quantum signatures and key exchange.
- QuFi says the external verification model can reduce the storage, bandwidth, and computation burden of putting large post-quantum signatures directly on blockchains.
- NIST has finalized ML-KEM, ML-DSA, and SLH-DSA as core post-quantum standards and continues work on migration and additional algorithms.
The importance of a Post-Quantum Verification Platform for Digital Assets
Cryptographic signatures are fundamental for public blockchains. Today, those signatures are used to secure wallet ownership, the authorization of transactions and much more. But strong enough quantum computers would pose a potential danger to some popular public-key cryptography. Because of that risk, planning for migration is becoming even more critical, although the timing for large-scale attacks by quantum computers is not yet clear.
Instead of being a one-chain upgrade, QuFi views the problem as an infrastructure issue. It checks an instruction on its own network prior to sending the result to a settlement environment. Instead, the settlement chain does not necessarily need to do all of the validation and verification steps that are costly.
That separation can be significant for networks that have already existing performance, fee and data limitations. Rather than coerce all blockchains into handling bigger signatures and extra verifications on the settlement path, a separate layer can handle heavy verifications off the settlement path.
The model also establishes a clear sequence for operations, to instruct, to verify, and then settle. This means that a bad or unfinished instruction can be halted before it is finalised in the settlement environment. The architecture has relevance for institutions requiring enhanced capabilities in the areas of high-value transfers, tokenized assets and cross-network settlement.
Security for Blockchains from Cryptographic Standards to Practical Security
QuFi employs the same standards as the industry. NIST finalized FIPS 203, FIPS 204, and FIPS 205 in August 2024. They use ML-KEM for key establishment and ML-DSA and SLH-DSA for digital signatures. NIST is now calling on organizations to start transitioning systems to quantum-resistant cryptography.
QuFi’s implementation is based on the interweaving of these standards, and does not rely on a single mechanism of cryptography. It includes signature platforms on its platform: ML-DSA-65 and SLH-DSA and supports secure key exchange: ML-KEM-1024. This multiple level approach is compatible with the broader principle of “cryptographic agility”, which means that infrastructure can evolve as threat models, standards, and implementations evolve.
QuFi’s Quantum-Resistant Digital Asset Infrastructure
The most tangible expression is uBTC, QuFi’s proof of concept for Bitcoin. The source indicates that uBTC is deployed on Bitcoin Testnet4, checks the validity of BTC collateral, and generates cryptographic evidence which regulates the flow of value across settlement environments. Redemptions are eventually replaced by regular bitcoins transactions.
More details are provided in the official QuFi product page. The deposit is added to the Taproot vault, the collateral is verified, and uBTC is minted based on the amount of Bitcoin deposited on a 1:1 ratio. In addition, there is also a spent-nullifier registry that protects against replay during the redemption phase.
This is important because security is not restricted to signing a transaction. A robust system would also need to record that there is collateral available, that an instruction is authorized and that no instruction can be authorized more than once. Thus, verification is a larger control plane within QuFi that envelops value movement.
A Proof-Gated Model for Settlement
Because of the importance of the proof itself as an output, QuFi’s architecture is important. The settlement environment is notified of the checks that have been completed, and the computation-intensive verification is performed in the network. To prevent this from being an unnecessary burden on every underlying chain, the design aims to keep post-quantum verification from becoming an unnecessary burden on every underlying chain.
At the moment, the company states that Bitcoin uBTC is live on Testnet4 and that Stellar is in progress. It also plans to deploy to Solana and Ethereum at the end of 2026, and other EVM chains in the first quarter of 2027, according to its roadmap. These are dates on the roadmap, and are not necessarily completed deployments.
Here’s what Post-Quantum Cryptography Blockchain Security Might Become Next.
There are several market trials for alternative strategies. In August 2026, StarkWare conducted a mainnet test of a quantum-resistant Bitcoin transaction without a fork, albeit one that was said to take hours to compute and cost somewhere between $150 and $200. Quantum-resistant signatures represent another experimental proposal that Bitcoin developers are considering to lower the size and performance cost of quantum-resistant signatures: SHRINCS.
Those experiments demonstrate the need to consider an infrastructure-layer approach. Native protection can be accomplished with direct protocol changes but can also be cost and compatibility sensitive and introduce new operational complexity. Another way of migrating is to add an external verification layer: enforce transaction authorization without an up-front redesign of every settlement network.
The practical question thus for asset issuers, custodians, exchanges and institutions is not, therefore, whether quantum computers exist today. Rather, it’s a question of whether key infrastructure for digital assets can be moved before assumptions about their safety become an emergency.
QuFi’s premiere does not mean that quantum attacks are imminent, nor that one architecture will be the industry standard. It does showcase, however, a timely infrastructure idea: use post-quantum cryptography to make sure that high-value instructions are not malicious before they are sent to the existing settlement systems for execution.
That distinction may gain more traction as digital assets go deeper into the institutional finance world. More incremental paths to quantum resilience might be provided by the security layers that preserve existing settlement rails, while introducing an independent form of verification. The clear priority for blockchain operators is to develop systems that can be verified today, migrate to post-quantum systems tomorrow, and stay adaptable, as post-quantum standards continue to mature.
Read Also: Web3 Infrastructure and TRON’s Quantum-Ready Future
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