Horizen has officially launched its privacy-focused appchain testnet on Base, introducing DarkSwap, a decentralized exchange designed to eliminate MEV attacks and provide bot-proof trading. The testnet deployment marks a significant milestone in Horizen’s evolution from a traditional blockchain to a privacy-first Layer 3 solution built on Coinbase’s Base network.
The launch comes just weeks after Horizen successfully migrated its native ZEN token from its original UTXO-based blockchain to Base as an ERC-20 asset in July 2025. This strategic transition discontinued the legacy mainchain and EON sidechain while introducing enhanced DeFi capabilities and reduced transaction costs through Base’s Ethereum Layer 2 infrastructure.
DarkSwap represents the first major application to leverage Horizen’s privacy infrastructure, offering traders protection against front-running bots and maximum extractable value (MEV) attacks that plague traditional decentralized exchanges. The platform utilizes zero-knowledge proofs to enable stealth transactions while maintaining the transparency required for regulatory compliance.
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Horizen’s Privacy-First Architecture
The Horizen appchain operates as a programmable privacy Layer 3, tapping into Base’s developer ecosystem and Coinbase’s compliance backbone. The modular architecture enables customizable privacy configurations for different application types while maintaining seamless Ethereum integration through Base’s established infrastructure.
Central to Horizen’s privacy capabilities is its implementation of Trusted Execution Environments (TEEs) and zero-knowledge proofs. The upcoming confidential compute environment, scheduled for Q4 2025, will allow secure, private application execution directly on-chain without requiring developers to master complex cryptographic concepts.
The platform’s composable privacy stack integrates multiple cryptographic technologies including zero-knowledge proofs (ZKPs), multi-party computation (MPC), and fully homomorphic encryption (FHE). This modular approach ensures Horizen can evolve alongside rapid developments in privacy technology while maintaining backward compatibility.
Developer accessibility remains a core focus, with the platform supporting familiar programming languages including Solidity, Node.js, and Python. This compatibility eliminates the learning curve typically associated with privacy-focused blockchain development, enabling existing Ethereum developers to deploy privacy-preserving applications using their current skillset.
ZEN Token Migration and Base Integration
The ZEN token migration to Base represented one of the most significant technical transitions in the project’s history. The migration increased the circulating supply to 17.25 million ZEN tokens, representing a 7.8% increase, with 750,000 tokens allocated specifically for DAO governance purposes.
Security audits conducted by Halborn and Cantina in June 2025 validated the safety of the migration process, covering over 5,000 lines of code including cross-chain bridges and ERC-20 minting logic. The audits found no critical vulnerabilities, though minor user interface improvements were recommended and subsequently implemented.
New trading pairs launched simultaneously on major DEX platforms, with ZEN/WETH and ZEN/cbBTC pairs available on Aerodrome, while Uniswap v3 hosts the ZEN/USDC pair. The ZEN token now operates under the official ERC-20 contract address 0xf43eB8De897Fbc7F2502483B2Bef7Bb9EA179229 on Base mainnet.
The final node upgrade ZEN 6.0.0 in July 2025 marked the completion of the legacy chain sunset, requiring all node operators to update their software to maintain network participation. This upgrade included automated asset claiming functionality to ensure users could seamlessly transition their holdings to the new Base-based ecosystem.
DarkSwap’s Bot-Proof Features
DarkSwap’s innovative approach to MEV protection utilizes Horizen’s privacy layer to obscure transaction details until execution, preventing sophisticated trading bots from front-running user trades. The platform implements selective disclosure mechanisms that allow for regulatory compliance while maintaining user transaction privacy.
The exchange features include batch auction mechanisms and commit-reveal schemes that aggregate trades before execution, eliminating the timing advantages typically exploited by MEV bots. Users can trade with confidence knowing their transaction intentions remain private until settlement occurs on the Base network.
Key features of the DarkSwap testnet include:
- Zero-knowledge proof integration for private transactions
- MEV protection through transaction obscuration
- Batch trading mechanisms to prevent front-running
- Regulatory-compliant selective disclosure options
- Seamless Base network integration for low-cost trades
The testnet phase allows developers and early users to experiment with privacy-preserving DeFi applications while providing feedback for mainnet optimization. According to the official Horizen roadmap, the full appchain launch is scheduled for Q3 2025, with additional confidential computing features arriving in Q4.
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The launch of DarkSwap on Horizen’s testnet represents a significant advancement in privacy-preserving DeFi infrastructure, potentially attracting users seeking protection from MEV exploitation. The successful integration with Base positions Horizen to capture value from both privacy-conscious traders and developers building the next generation of confidential applications, while the ZEN token benefits from enhanced utility and improved liquidity access within the broader Ethereum ecosystem.
- Layer 3 (L3)
- A blockchain scaling solution built on top of Layer 2 networks, providing specialized functionality while inheriting security from the underlying layers. L3s often focus on specific use cases like privacy, gaming, or enterprise applications.
- Maximum Extractable Value (MEV)
- The profit that can be extracted from reordering, including, or excluding transactions within a block. MEV often disadvantages regular users through front-running and sandwich attacks.
- Zero-Knowledge Proofs (ZKPs)
- Cryptographic methods that allow one party to prove knowledge of information without revealing the information itself. In blockchain applications, ZKPs enable privacy while maintaining verifiability.
- Trusted Execution Environment (TEE)
- A secure area within a processor that ensures code and data are protected from modification or inspection. TEEs enable confidential computing by isolating sensitive operations from the broader system.
- Commit-Reveal Scheme
- A cryptographic protocol where users first submit a commitment to their intended action, then later reveal the actual action. This prevents others from seeing and reacting to the action before it’s finalized.
