Introducing Base Azul (3 minute read)
Base is shipping its first independent network upgrade on May 13, introducing multiproofs for faster withdrawals and consolidating to a single high-performance client stack.
What: Base Azul is a major network upgrade for Coinbase's Base layer 2 that combines TEE and zero-knowledge provers into a multiproof system, enabling one-day withdrawals when both proofs agree and meeting Stage 2 decentralization requirements. The upgrade also consolidates Base's infrastructure onto base-reth-node and base-consensus clients while adopting Ethereum's Osaka specification changes.
Why it matters: This represents Base's shift to controlling its stack end-to-end rather than relying on the Optimism stack, enabling faster iteration and independent upgrades. The multiproof approach provides defense-in-depth security by requiring attackers to compromise multiple independent proof systems, while the Reth-based consolidation has already shown dramatic improvements like 99% fewer empty blocks and sustained 5,000 TPS bursts.
Takeaway: Node operators must migrate to base-consensus and base-reth-node before May 13. Developers using MODEXP heavily or sending large transactions should review the Osaka spec changes, and security researchers can participate in the $250,000 Immunefi audit competition running until May 4.
Deep dive
- Base Azul consolidates the network onto a streamlined stack (base-reth-node and base-consensus) after moving away from the broader Optimism stack, giving Base full control over its infrastructure evolution
- The multiproof system combines Trusted Execution Environment (TEE) and zero-knowledge provers where either can finalize proposals independently, but when both agree withdrawals complete in one day instead of the standard seven
- ZK proof submission is permissionless and overrides permissioned TEE proofs in case of disagreement, providing security-in-depth inspired by Vitalik's L2 finalization roadmap
- Stage 2 decentralization is a key milestone requiring the ability to detect and handle proof system bugs onchain without central intervention
- Performance improvements are already visible: empty blocks reduced from ~200/day to ~2/day (99% reduction) and the network sustained multiple 5,000 TPS bursts
- The consolidation onto Reth provides headroom for Base's goal of reaching 1 gigagas/s throughput, with Reth being one of Ethereum's highest-performing execution clients
- Osaka spec adoption includes EIP-7825 (17M gas per-transaction cap), EIP-7939 (CLZ opcode for efficient compute), and MODEXP gas cost increases for DoS protection
- All consensus and execution clients except base-reth-node and base-consensus are being dropped, with plans to merge these into a single binary in coming months
- Base is launching Vibenet in mid-May as a permanent public devnet for developers to test upcoming features before mainnet deployment
- The upgrade cadence continues with a performance-focused update in late June (enshrined token standard, access lists, reduced withdrawal times) and a UX-focused update in late August (native account abstraction)
- Every onchain component and proof system underwent internal and external audits, with a $250,000 Immunefi competition (April 21-May 4) incentivizing discovery of critical vulnerabilities
- The multiproof approach is explicitly an intermediate step toward full ZK proving with near-instant withdrawals, requiring additional ZKVMs and real-time proving performance improvements
Decoder
- Stage 2 decentralization: The second of three stages in L2 maturity where the network can detect and recover from proof system failures without centralized intervention
- Multiproofs: A system where multiple independent proof types (TEE and ZK) can each validate state transitions, providing redundancy and faster finality when they agree
- TEE (Trusted Execution Environment): Hardware-based isolated execution environments that cryptographically verify code ran correctly without modification
- ZK (Zero-Knowledge) proofs: Cryptographic proofs that allow verification of computation correctness without re-executing it, enabling trustless validation
- ZKVM: Zero-knowledge virtual machine that generates ZK proofs of program execution, enabling verifiable off-chain computation
- Reth: A high-performance Ethereum execution client written in Rust, known for speed and efficiency
- Kona: The base layer for Base's new consensus client implementation
- Gigagas/s: A throughput measure representing one billion gas units per second, indicating transaction processing capacity
- MODEXP: A precompiled contract for modular exponentiation used in cryptographic operations
- Flashblocks: Base's real-time block streaming system that provides websocket access to block data as it's produced
- Osaka: Ethereum's upcoming execution layer specification that includes various performance and security EIPs
Original article
Base Azul launches May 13, introducing multiproofs for faster withdrawals and Stage 2 decentralization. The upgrade consolidates the stack onto base-reth-node and base-consensus, aligns with Ethereum Osaka specs, and includes a $250,000 Immunefi audit competition to ensure network security and reliability for developers and node operators.