StarkWare Researcher Completes First Quantum-Safe Bitcoin Transaction

StarkWare researcher Avihu Levy completes Bitcoin's first Quantum-Safe transaction on mainnet without altering consensus rules or requiring a soft for StarkWare researcher Avihu Levy has completed the first confirmed transaction using a Quantum-Safe Bitcoin (QSB) scheme on the Bitcoin mainnet, demonstrating an experimental approach designed to protect transactions against potential attacks based on Shor's algorithm without requiring a soft fork or changes to Bitcoin's consensus rules. The development, highlighted by @WuBlockchain in an update on X, introduces a method that shifts transaction security away from elliptic-curve cryptography and toward hash-based security assumptions. While the transaction represents a demonstration of the technology on Bitcoin's live network, QSB remains experimental and currently requires approximately $75-$150 in off-chain GPU computation for each transaction. Quantum-Safe Bitcoin Transaction Reaches Mainnet Levy's QSB scheme has completed its first confirmed transaction on the Bitcoin mainnet, marking a practical demonstration of the proposed security mechanism under real network conditions. The approach is designed around the potential threat posed by sufficiently capable quantum computers. Shor's algorithm is a quantum algorithm that can theoretically be used to break certain cryptographic systems, including those based on elliptic-curve cryptography, which is used in Bitcoin's transaction security infrastructure. Rather than modifying Bitcoin's consensus rules, QSB seeks to introduce quantum-resistant transaction security through a different cryptographic ,financial construction. This allows the scheme to operate without requiring a Bitcoin soft fork, according to the information provided. The mainnet transaction therefore serves as a demonstration that the proposed mechanism can be used within Bitcoin's existing consensus framework. QSB Shifts Security Toward Hash-Based Assumptions A central feature of the Quantum-Safe Bitcoin scheme is its reliance on hash-based security assumptions rather than elliptic-curve cryptography. Hash functions are already fundamental to Bitcoin and are used throughout the network for purposes including transaction processing, block construction and proof-of-work. Hash-based cryptographic techniques are also among the approaches considered in the development of post-quantum cryptography. The QSB scheme applies this type of security assumption to transaction protection. The objective is to reduce reliance on cryptographic markets structures that could theoretically become vulnerable to quantum attacks using Shor's algorithm. The approach is distinct from changing Bitcoin's underlying consensus mechanism. According to the reported information, QSB does not require a soft fork or modifications to Bitcoin's consensus rules. Technology Remains Experimental Despite the successful mainnet transaction, QSB remains an experimental technology rather than an established replacement for Bitcoin's existing transaction-security mechanisms. One of the current limitations is the computational requirement associated with the scheme. Each transaction requires roughly $75-$150 in off-chain GPU computation. That additional computational cost represents a practical consideration for any future implementation. The calculation takes place off-chain,financial meaning the GPU workload is not performed directly through Bitcoin's consensus process. The reported cost also reflects the current state of the experimental system and could be relevant when evaluating its potential scalability or practical use. No claim was made that QSB is ready for broad deployment across the Bitcoin network. Quantum Computing and Bitcoin Security Quantum computing has long been discussed as a potential future challenge for cryptographic systems. A sufficiently powerful quantum computer could theoretically use Shor's algorithm to attack public-key cryptography based on mathematical problems that are difficult for conventional computers. Bitcoin's use of elliptic-curve cryptography is consequently part of broader discussions about how digital assets could respond to advances in quantum computing. The QSB experiment approaches that issue without changing Bitcoin's consensus rules. By using hash-based assumptions for transaction security, the scheme explores whether quantum-resistant functionality can be introduced while maintaining compatibility with the existing network. The first confirmed QSB transaction on mainnet provides a practical demonstration of the concept, but the technology remains at an experimental stage. Its current requirement for approximately $75-$150 in off-chain GPU computation per transaction is among the factors that would need to be considered alongside its cryptographic properties. Technology & Blockchain Writer Victoria Hale writes about blockchain technology, digital infrastructure, and the intersection of emerging technologies with finance. Her articles explore how new protocols and systems are shaping the evolving digital economy. She prioritises clarity and accuracy when explaining technical developments to a general audience.