QuFi Debuts Post-Quantum Verification Platform Using Bitcoin Testnet Proof

Post-quantum security-focused startup QuFi Network has launched a verification platform aimed at protecting digital assets from potential future quantum computing attacks—without forcing users to upgrade or fork existing blockchain settlement layers. The approach, according to QuFi, is built around separating “verification” from “settlement,” so that transactions can be validated with post-quantum cryptography while value is ultimately settled on familiar networks.

Alongside the platform, QuFi introduced uBTC, a proof of concept that applies the verification system to Bitcoin collateral. uBTC is currently running on Bitcoin testnet, with redemptions designed to complete as standard Bitcoin transactions after the verification step produces cryptographic proofs that govern how value can move between settlement environments.

Key takeaways

• QuFi’s platform validates transactions using post-quantum cryptography before settling them on existing blockchain networks, avoiding direct post-quantum signature deployment on-chain.
• uBTC is a Bitcoin-focused proof of concept on testnet, verifying BTC collateral and issuing proofs that constrain value movement, while final settlement remains standard Bitcoin transactions.
• QuFi says the design uses three post-quantum cryptographic standards—ML-DSA-65, SLH-DSA, and ML-KEM-1024—to handle signatures and secure key exchange.
• The company’s stated goal is to reduce potential increases in storage, bandwidth, and computation that can come with using larger post-quantum primitives directly within blockchains.
• The launch lands as multiple parts of the ecosystem experiment with quantum-resistant techniques, including Bitcoin signature proposals and efforts by institutions and protocol developers.

A verification layer instead of a blockchain upgrade

QuFi’s main product concept centers on an external verification layer. Rather than asking each settlement network to adopt new post-quantum cryptographic rules, QuFi proposes using a decentralized set of nodes to validate transactions with post-quantum cryptography ahead of settlement.

In QuFi’s framing, this architecture helps address one of the most common implementation challenges in the post-quantum transition: larger keys and signatures can translate into higher on-chain costs and performance overheads. By performing verification off the settlement path, QuFi says it aims to avoid added storage, bandwidth, and computing demands that could arise from integrating post-quantum primitives directly into individual chains.

The platform uses post-quantum standards that cover both digital signatures and key exchange. QuFi lists ML-DSA-65 and SLH-DSA for signatures, and ML-KEM-1024 for secure key exchange—building blocks it says are used to generate and check cryptographic proofs prior to settlement on existing blockchains.

uBTC on Bitcoin testnet: proofs constrain value movement

QuFi also launched uBTC, described as a proof-of-concept system applying the verification approach to Bitcoin. The system is currently operating on Bitcoin testnet4.

Per QuFi’s description, uBTC verifies BTC collateral and generates cryptographic proofs that govern how value moves between settlement environments. Importantly, QuFi says the redemptions ultimately settle as standard Bitcoin transactions. That means the Bitcoin network would not be required to run post-quantum signatures as part of the final settlement step—at least within this proof of concept.

For investors and developers tracking quantum-readiness, this structure is notable because it suggests one possible pathway for gradual migration: keep the “trust anchor” settlement layer stable while introducing stronger cryptographic verification elsewhere. The remaining question is how widely such proof-based settlement constraints can be adopted—especially when interacting with multiple networks and wallets that may have different assumptions about validation and finality.

Why the timing matters: quantum defense work is accelerating

QuFi’s announcement arrives amid a broader push across crypto to prepare for quantum-related risks. In August, StarkWare reportedly tested a quantum-resistant Bitcoin transaction on mainnet without requiring a fork. While the test demonstrated feasibility, the same coverage noted that the transaction required hours of computation and cost roughly $150 to $200, and it used a nonstandard format that required direct miner submission.

That earlier experiment highlights the practical friction QuFi is trying to bypass: even when post-quantum methods are technically possible, making them efficient and compatible with mainstream blockchain transaction flows is difficult. QuFi’s verification-layer approach is positioned as one way to reduce those integration costs.

Institutional and regulatory efforts are also part of the picture. According to prior reporting, banks and regulators across Europe, the Middle East, and Asia joined a pilot testing post-quantum wallets and onchain transfers using ML-DSA-65—one of the standards QuFi says it uses in its platform. Meanwhile, the Ethereum Foundation reportedly dropped its planned Poseidon hash function from a post-quantum architecture in favor of established alternatives such as SHA or BLAKE, reflecting a preference for reducing uncertainty by leaning on primitives with broader operational familiarity.

Bitcoin’s protocol-level experiments: trade-offs are already showing

Beyond off-chain or verification-layer approaches, some Bitcoin-focused quantum defenses are being explored directly at the protocol or signature scheme level. In August, Blockstream researchers published a Bitcoin Improvement Proposal for SHRINCS, an experimental post-quantum signature scheme intended to reduce size and performance costs associated with quantum-resistant signatures.

However, the same coverage also emphasized constraints and open issues. SHRINCS relies on stateful signatures to shrink signature size, which would require wallets to track signing keys previously used. It also remains early-stage, with no completed security proof referenced in that reporting, and it adds complexity that could increase user error risk if wallet implementations do not correctly manage state.

Compared with these protocol-level directions, QuFi’s emphasis is on reducing direct changes to settlement chains. For readers, the practical takeaway is that quantum readiness is not a single technology swap—it’s a spectrum of strategies, ranging from experimental signature schemes that modify transaction formats to separate verification systems that attempt to preserve existing settlement processes.

As QuFi’s platform and uBTC evolve, the key things to watch are how proof generation and verification perform under realistic load, whether the proofs integrate cleanly with broader wallet and settlement workflows, and how the project’s approach compares in cost and usability to protocol-level quantum defenses like SHRINCS. The next milestones—especially any expansion beyond testnet and any evidence of interoperability—will likely determine whether verification-layer quantum protection can move from concept to practical deployment.