While the industry is locked in heated debates over how to save Bitcoin from the hypothetical threat of quantum computing, QuFi Network has presented an elegant solution that requires no intervention in the base protocol of the first cryptocurrency. The developers have launched a post-quantum verification platform, successfully demonstrating its operation on the Bitcoin Testnet4 test network.
Architectural breakthrough: off-chain verification
QuFi's key innovation lies in the radical separation of transaction verification processes from their final execution. Instead of burdening each blockchain with complex post-quantum computations, the platform deploys a network of independent verifier nodes. These nodes conduct cryptographic checks before funds are moved, then transmit only a compact proof of the operation's correctness to the main network.
This approach eliminates the main challenge of transitioning to quantum-resistant algorithms—the need to process vast amounts of data directly on the blockchain. After all, post-quantum signatures can be several times larger than traditional cryptographic counterparts, which would place significant strain on bandwidth and storage requirements.
Practical demonstration on Bitcoin
To prove the viability of the concept, the company created uBTC—a proof-of-concept that verifies the presence of real BTC as collateral and generates cryptographic proofs for subsequent value transfers. The full uBTC cycle, including issuance, burning, and redemption, was successfully implemented on Bitcoin Testnet4. Upon redemption, funds are sent via a regular Bitcoin transaction that can be independently verified on the network—while the first cryptocurrency's protocol remains completely untouched.
The security foundation relies on three standards developed under the U.S. National Institute of Standards and Technology (NIST) initiative: ML-DSA-65 for digital signatures, SLH-DSA as an additional hash-based scheme, and ML-KEM-1024 for secure key exchange.
Prospects and limitations
However, it would be premature to speak of full-fledged post-quantum protection for Bitcoin—the system currently operates exclusively on a test network. QuFi has already announced plans to expand the solution to EVM-compatible networks, Stellar, and Solana, as well as launched the Genesis Node program for operators of the decentralized verification network. In the long term, the company aims to create a unified verification layer for multiple blockchains and financial systems.
It is worth noting that this approach differs radically from StarkWare's strategy, which in August conducted the first quantum-resistant transaction directly on the Bitcoin mainnet.
My analysis: QuFi's solution looks pragmatic and scalable, but raises questions about trust in a centralized network of verifiers. It remains unclear whether such a system can provide a sufficient level of decentralization and security to protect trillion-dollar assets. Nevertheless, the very fact that a working protocol has emerged is an important step toward the industry's practical readiness for the quantum era.