The threat of quantum computing to Bitcoin's cryptographic foundations is becoming increasingly tangible, and the industry is seeking elegant workarounds that do not require painful protocol changes. In this context, QuFi Network has presented an ambitious solution — a post-quantum verification platform that moves transaction verification off-chain. The demonstration took place on the Bitcoin Testnet4, underscoring the practical focus of the development.
Architectural Shift: Verification Separate from Execution
QuFi's key innovation lies in separating the processes of cryptographic verification and final settlement. Instead of forcing every blockchain to process bulky post-quantum algorithms, the platform uses a network of independent verifier nodes. These nodes analyze a transaction before funds are moved and generate a compact proof, which is then passed to the main network for execution.
This approach solves a fundamental scalability problem. Post-quantum signatures, especially those under NIST standards, can be many times larger than traditional ECDSA or Schnorr. Integrating them directly into Bitcoin would lead to bloated blocks, increased storage requirements, and bandwidth demands. QuFi avoids this by keeping the base layer untouched.
Technical Foundation and Bitcoin Test
For protection, three algorithms approved by the U.S. National Institute of Standards and Technology are used: ML-DSA-65 for digital signatures, SLH-DSA as a backup hash-based scheme, and ML-KEM-1024 for secure key exchange. As part of the proof-of-concept, the company created uBTC — a wrapped token that verifies the presence of real BTC as collateral and generates proofs for moving value.
The full uBTC cycle — issuance, burning, and redemption — operates on Bitcoin Testnet4. Upon redemption, funds are sent via a regular Bitcoin transaction that can be verified with standard tools. The first cryptocurrency's protocol remains unmodified. This is a fundamental difference from approaches requiring soft forks or new opcodes to embed quantum-resistant schemes.
Limitations and Prospects
However, it is premature to talk about full protection of Bitcoin from quantum attacks. The system operates exclusively in a test environment, and significant barriers must be overcome before mainnet deployment. QuFi has already announced plans to expand to EVM-compatible networks, Stellar, and Solana, and has opened a Genesis Node program for operators of the decentralized verification network.
Notably, in August, StarkWare already conducted the first quantum-resistant transaction on the Bitcoin mainnet, confirming a growing trend toward hybrid solutions.
My analysis: QuFi's strategy is a pragmatic intermediate stage. By moving verification off-chain, they create an additional layer of trust in a network of nodes, which in itself is a centralizing factor. However, in the race against quantum computers, such solutions could become a necessary bridge until the community develops a unified standard for upgrading the base protocol.