Deep Dive
1. Final Node Upgrade (July 2025)
Overview: The ZEN 6.0.0 and EON 1.5.0 releases marked the final mandatory update for node operators, triggering the migration to Base and decommissioning Horizen’s original UTXO chain.
This upgrade disabled legacy chain functionalities, requiring all nodes to adopt the new Base-compatible software. Users holding native ZEN were instructed to claim ERC-20 tokens via a migration portal.
What this means: This is bullish for ZEN because it streamlines infrastructure for a privacy-focused appchain ecosystem. However, delayed upgrades risked asset inaccessibility. (Source)
2. Base Migration (23 July 2025)
Overview: ZEN converted from a UTXO-based token to an ERC-20 on Base, integrating with DEXs like Aerodrome and Uniswap.
The migration increased circulating supply to 17.25M ZEN (from 16M) and introduced DAO governance. Legacy chains were deprecated, requiring users to move assets before deadlines.
What this means: This is neutral for ZEN because while DeFi liquidity improved, migration complexity caused temporary exchange suspensions (e.g., Upbit halting withdrawals). (Source)
3. Dual Security Audits (June 2025)
Overview: Cantina audited Horizen’s migration contracts and claim tools, finding no critical vulnerabilities ahead of the Base transition.
Audits focused on preventing supply exploits and ensuring secure token redemption. Post-migration, ZEN’s ERC-20 contract retained a 21M hard cap.
What this means: This is bullish for ZEN because it reduced migration-related risks, though long-term security depends on ongoing audits. (Source)
Conclusion
Horizen’s codebase overhaul aligns with its shift to a privacy-first L3 appchain on Base, balancing technical ambition with user security. While liquidity and interoperability gains are evident, adoption hinges on seamless integration of upcoming privacy features like stealth addresses. How will Horizen differentiate its privacy stack in Base’s crowded DeFi ecosystem?