QuFi Network, a post‑quantum infrastructure firm, announced a verification platform that separates transaction validation from settlement. The system employs a decentralized node network to apply post‑quantum cryptographic standards—ML‑DSA‑65, SLH‑DSA and ML‑KEM‑1024—before transactions are recorded on existing blockchains.
The company unveiled uBTC, a proof‑of‑concept that runs on Bitcoin Testnet4. uBTC validates Bitcoin collateral, creates cryptographic proofs governing value movement between settlement environments, and ultimately settles redemptions as ordinary Bitcoin transactions.
By placing verification off‑chain, QuFi aims to avoid the storage, bandwidth and computational overhead associated with embedding large post‑quantum signatures directly on blockchains.
The launch follows a series of recent quantum‑resilience experiments. In August, StarkWare tested a quantum‑resistant Bitcoin transaction on mainnet without a fork; the operation required several hours of computation and cost between $150 and $200. The same month, banks and regulators in Europe, the Middle East and Asia piloted post‑quantum wallets and on‑chain transfers using ML‑DSA‑65, one of QuFi’s chosen standards. The Ethereum Foundation recently dropped the Poseidon hash from its post‑quantum roadmap in favor of established hashes such as SHA and BLAKE.
Blockstream researchers also published a Bitcoin Improvement Proposal for the SHRINCS signature scheme, which reduces signature size but relies on stateful keys and remains without a completed security proof. The proposal highlights trade‑offs between performance and complexity that QuFi’s external verification layer seeks to mitigate.
QuFi’s platform represents a step toward integrating quantum‑safe cryptography into existing blockchain ecosystems without requiring protocol forks or extensive on‑chain changes.
