Horizen is a modular platform prioritizing privacy, designed to make advanced privacy technologies like zero-knowledge proofs and trusted execution environments accessible for widespread use on the web. Launched in 2017 as a fair launch project without an ICO, Horizen is evolving with the introduction of Horizen 2.0, a next-generation Layer 3 appchain on Base, which is a Layer 2 solution developed by Coinbase that enhances Ethereum’s capabilities. Horizen 2.0 leverages Ethereum's robust security while establishing its own application-level integrity guarantees. This innovative architecture benefits from Base’s rollup security and settlement on Ethereum, ensuring strong finality and allowing for seamless integration with other Layer 2 and Layer 3 applications. The streamlined design enhances user safety and decentralizes privacy layers, moving away from the previous hybrid PoW/PoS model. The platform's unique privacy-first approach employs a variety of privacy-enhancing technologies, such as zero-knowledge proofs, attribute-based encryption, and multi-party computation. This diverse stack supports scalable, flexible privacy solutions, enabling private identity management, decentralized finance, on-chain gaming, and compliant confidential transactions across its ecosystem. ZEN, the native utility token of Horizen, plays a crucial role in the ecosystem. It is utilized for governance purposes, accessing privacy services, and powering interactions within privacy applications. With Horizen's migration to Base, ZEN has transitioned to an ERC-20 token, enhancing its liquidity and interoperability within the Ethereum ecosystem. As a developer-centric platform, Horizen offers EVM compatibility and privacy-friendly tools, allowing developers to create privacy-first applications without needing extensive cryptographic knowledge. Governed by the Horizen DAO, the project is committed to transparent development and community-led decision-making, fostering an evolving decentralized protocol.