txFusion

txFusion is a pioneering Zero-Knowledge (ZK) R&D startup founded in 2022, headquartered in Banja Luka, Bosnia and Herzegovina. The company is on a mission to bring millions of users to blockchain technology by scaling the Ethereum and Bitcoin ecosystems through the development of ZK tools, products, and services. txFusion bridges Zero-Knowledge technology and real-world applications, empowering the blockchain community by hiding the complexities of ZK while unleashing its full potential.

Core Products and Services

txFusion develops and maintains a broad range of ZK-focused infrastructure, developer tooling, and user-facing products. Their flagship platform, txSync, is the leading environment for learning, using, and building on ZKsync — featuring a bridge, portal, playground, and paymaster tools. The team also maintains the official ZKsync SDKs across multiple programming languages (JavaScript, Python, Java, Go, Swift) and a comprehensive suite of hardhat-zksync plugins for smart contract development and deployment on ZKsync Era.

On the product side, txFusion built Tsuko, a Paymaster-as-a-Service (PaaS) dApp that simplifies paymaster usage on ZKsync, and Visor, a suite of smart account plugins. They also developed the txSync SDK and txSync Viem SDK to help developers integrate paymaster functionalities. For infrastructure, they built and operated the wstETH-ZKsync bridge for Lido Finance and a ZKsync relayer for Pudgy World, and supported the Hyperlane-ZKsync integration to enable cross-chain messaging between Ethereum L1 and ZKsync L2.

Key Strengths

• Deep expertise in Zero-Knowledge cryptography and ZKsync Era ecosystem
• Track record of maintaining official ZKsync SDKs and Hardhat plugins in partnership with Matter Labs
• Proven ability to deliver production-grade ZK infrastructure for leading Web3 protocols
• Active R&D into extending ZK technology to the Bitcoin ecosystem
• Trusted by partners including Matter Labs (ZKsync), Lido Finance, and Pudgy World

Notable Clients and Projects

• Matter Labs / ZKsync: Long-term partnership maintaining ZKsync SDKs (JS, Python, Java, Go, Swift) and the full suite of hardhat-zksync plugins
• Lido Finance: Built and operated the wstETH ↔ ZKsync bridge, enabling liquid staking on ZKsync
• Pudgy World: Built and operated a ZKsync relayer providing API abstraction for NFT interactions
• ETHDenver 2023: Developed backend for ZKsync's BuidlBux food truck token payment system

Why Choose txFusion

txFusion offers a rare combination of deep ZK protocol knowledge, production-proven infrastructure delivery, and ongoing SDK maintenance expertise. Their unique positioning in the ZKsync ecosystem — backed by a direct partnership with Matter Labs — makes them a trusted partner for any project seeking to build on or integrate with ZKsync Era. Their upcoming ZK-on-Bitcoin initiative signals continued innovation at the frontier of the ZK space.