Base launches Azul upgrade, cutting withdrawals to one day

Base’s Azul upgrade is now live on the Base mainnet, the Ethereum layer‑2 network built by Coinbase, and it reduces withdrawal finality from seven days to a single day while adding a dual‑proof security architecture [1].

Key takeaways

• Withdrawal finality drops to one day when both proof systems agree [1]
• Azul combines trusted execution environment (TEE) proofs with zero‑knowledge (ZK) proofs; either can finalize a proposal, but both must concur for the fastest exit [2]
• The upgrade consolidates node software to base‑reth‑node and base‑consensus, giving Base more technical autonomy [1]
• Base’s total value locked is about $4.4 billion, with USDC liquidity leading optimistic rollups [2]
• The change marks the first independent upgrade after Base left the Optimism Superchain, advancing its Stage 2 decentralization roadmap [2]

Multiproof architecture and faster exits

Azul’s headline feature is the reduction of withdrawal times. Previously, users had to wait seven days for assets to leave Base; the new system can settle withdrawals in one day once both the TEE and ZK proof mechanisms confirm the transaction [1]. The upgrade’s multiproof design requires two independent cryptographic verifications: hardware‑based TEE proofs and ZK proofs generated by Succinct’s SP1 prover. Either proof type can independently finalize a proposal, but when both reach the same conclusion, the one‑day finality applies [2]. This dual‑proof approach is intended to raise the security bar, as an attacker would need to compromise both the hardware environment and the ZK cryptography simultaneously [1].

Infrastructure overhaul and network impact

Alongside the proof changes, Base unified its client stack. Node operators migrated to the new execution client base‑reth‑node and the consensus client base‑consensus, which is built on OP Kona [2]. This consolidation reduces reliance on external client software and lays groundwork for future upgrades without upstream dependencies [1]. Early performance metrics show empty blocks falling from roughly 200 per day to about two, and the network handling bursts of up to 5,000 transactions per second [2]. The upgrade also incorporates the CLZ opcode and aligns with Ethereum’s Osaka repricing, meaning most dApp developers need minimal code adjustments [2].

Why it matters

Azul directly addresses a common criticism of optimistic rollups—the lengthy exit window—by offering a one‑day withdrawal path, which could improve user experience and reduce reliance on centralized bridges [1]. The multiproof system enhances security and supports the roadmap toward Stage 2 decentralization, where Base’s security will rely entirely on its proof mechanisms rather than any trusted party [2]. With roughly $4.4 billion locked and leading USDC liquidity among rollups, the upgrade positions Base to compete more aggressively with other Ethereum L2s while moving closer to a fully permissionless sequencing model [2]. Upcoming upgrades slated for mid‑2026 aim to boost performance and introduce native account abstraction, further advancing Base’s decentralization goals.