May 4, 2026—Ethereum Layer 2 network Base announced a major upgrade that industry insiders are calling an "L2 security watershed." In partnership with zero-knowledge proof infrastructure company Succinct Labs, Base is integrating the SP1 zero-knowledge virtual machine (zkVM) into its Azul upgrade, introducing cryptographic finality for approximately $7.4 billion in deposits on the network. This not only slashes the maximum withdrawal period from Base to Ethereum mainnet from seven days to just one day, but also signals a structural shift in Ethereum L2 security standards—from "game-theoretic trust" to "mathematical verification."
With mainnet activation scheduled for May 13, this development is sparking widespread discussion about Ethereum L2 security models, multi-proof architectures, and the path toward decentralization.
Key Facts at a Glance
| Dimension | Fact |
|---|---|
| Event | Base announces integration of Succinct SP1 zero-knowledge proofs |
| Capital Scale | SP1 will prove approximately $7.4 billion in deposits |
| Network TVL | Base’s current total value locked is about $4.644 billion |
| Mainnet Launch | May 13, 2026 |
| Core Change | Withdrawal challenge period reduced from 7 days to 1 day with cryptographic finality |
| Technical Approach | Hybrid TEE + ZK multi-proof system |
| Open-source zkVM | SP1, supports Rust and RISC-V architecture |
| ETH Reference Price | $2,324.29 (as of May 7, 2026, source: Gate market data) |
Security Upgrade for $7.4 Billion in Assets
On May 4, Base officially announced the introduction of the SP1 zero-knowledge virtual machine, developed by Succinct Labs, through the Azul upgrade to generate zero-knowledge proofs. At its core, this collaboration means SP1 will provide cryptographic proofs for approximately $7.4 billion in deposits on Base, making it the largest single Ethereum operator to implement ZK proofs for finality at this scale.
Wilson Cussak, Head of Base Network, stated: "As the network grows, so does the need to strengthen the infrastructure that users and developers rely on every day. Expanding Base with ZK proofs is a critical step toward deepening the network’s security and resilience."
Notably, Base is not abandoning its existing optimistic rollup architecture. Instead, it’s adopting a hybrid approach—incorporating both TEE proofs and ZK proofs into a multi-proof system. The Azul upgrade launched on testnet on April 21 and will go live on mainnet May 13. To ensure code security, Base launched an audit competition on the Immunefi platform, with a total prize pool of $175,000 plus a $25,000 all-star pool. The contest ran from April 21 to May 4.
From OP Stack Dependence to Independent ZK Architecture
Base’s shift to ZK is not an isolated decision, but part of a series of technical and strategic adjustments. Understanding this process helps contextualize the significance of this upgrade within Base’s overall development trajectory.
2024–2025: The OP Stack Era
Base initially launched as a member of the Optimism Superchain ecosystem, using the OP Stack as its foundational technology. In this setup, Base used an optimistic rollup model—assuming all transaction batches are valid by default, with a roughly seven-day challenge period during which anyone could dispute suspicious transactions. This model’s core security assumption is "wait for challenges."
February 2026: Breaking Away from OP Stack and Unifying Codebase
Base announced the decoupling of its key network components from the OP Stack, integrating them into its own unified codebase. From that point, node operators followed Base’s releases instead of Optimism’s, and network upgrade frequency increased from three to six times per year. Base also announced plans to transition from optimistic proofs to a TEE/ZK architecture in future hard forks, maintaining Stage 1 rollup status and adding independent signers to its security council.
April 21, 2026: Azul Upgrade Goes Live on Testnet
The Azul upgrade was deployed to testnet, introducing a multi-proof system that combines TEE and ZK proofs. The new architecture unified Base’s client stack to a single execution client, base-reth-node, and a new consensus client, base-consensus, based on Kona. After the upgrade, the number of empty blocks dropped from about 200 per day to just 2—a 99% reduction. The network handled multiple bursts of 5,000 TPS during the testnet phase.
May 4, 2026: ZK Proof Collaboration Officially Announced
Base and Succinct formally announced their partnership, with SP1 set to provide proofs for approximately $7.4 billion in deposits on Base.
May 13, 2026 (Expected): Mainnet Activation
The Azul upgrade will be activated on Base mainnet, marking the entry of the hybrid multi-proof system into production.
Timeline Overview
| Date | Event |
|---|---|
| 2024–2025 | Base runs optimistic rollups on OP Stack |
| February 2026 | Breaks away from Optimism Superchain, establishes unified codebase |
| April 21, 2026 | Azul testnet launch, introduces multi-proof system |
| May 4, 2026 | Official announcement of SP1 ZK proof integration |
| May 13, 2026 | Azul mainnet activation (expected) |
How Multi-Proof Systems Are Reshaping L2 Security Models
Security Assumptions and Real-World Friction in the Old Architecture
Under the optimistic rollup model, Base assumes all state batches submitted to Ethereum mainnet are valid unless someone submits a fraud proof within the seven-day challenge window. This model’s security hinges on two premises: first, that at least one honest validator is both willing and able to detect and submit a fraud proof in time; second, that the challenge period is long enough for validators to discover and respond to issues.
In practice, the seven-day lockup period restricts capital efficiency. Moreover, the security effectiveness of the challenge period does not scale linearly with network size: as assets and transaction complexity grow, the burden on a single challenge window intensifies.
The New Architecture: Dual TEE and ZK Verification
The Azul upgrade centers on building a multi-proof system with two independent verification channels:
TEE Proof Channel: Proofs are generated by a Trusted Execution Environment (TEE), a permissioned channel known for high processing efficiency. TEEs provide hardware-level isolation, ensuring computations can’t be tampered with.
ZK Proof Channel: Proofs are generated by the SP1 zkVM, a permissionless channel. SP1 is based on the RISC-V instruction set and supports verification programs written in standard Rust, which are compiled to RISC-V and then executed to generate ZK proofs. Developers can integrate ZK proofs without writing custom circuits.
Either proof can independently finalize transaction proposals. When both proofs agree, withdrawal settlement time drops from seven days to one. If the two proofs conflict, the permissionless ZK proof overrides the permissioned TEE proof—this design enables on-chain fault detection and handling, marking a key step toward Stage 2 decentralization as defined by L2BEAT.
SP1’s Performance Foundation
Technically, SP1 has demonstrated the following: SP1 Hypercube, running on 16 RTX 5090 GPUs, can generate zero-knowledge proofs for 99.7% of Ethereum mainnet blocks in just 12 seconds. SP1 is also the first zkVM to achieve full formal verification of all 62 core RISC-V opcodes, validated by Nethermind Security and the Ethereum Foundation.
From an ecosystem perspective, SP1 has generated millions of proofs for over 35 clients, covering protocols like Polygon, Mantle, and Lido, with total assets of about $4 billion.
Architecture Comparison at a Glance
| Dimension | Old Architecture (Optimistic Rollup) | New Architecture (Multi-Proof System) |
|---|---|---|
| Security Model | Game-theoretic trust: honest validator assumption | Cryptographic verification with redundancy |
| Withdrawal Time | Up to 7 days | As short as 1 day (when both proofs agree) |
| Proof Mechanism | Single fraud proof channel | Parallel TEE and ZK channels |
| Fault Detection | Relies on manual challenges | ZK can override TEE errors (automatic) |
| Proof Generation | No pre-computation needed | ZK requires computational resources |
| Decentralization Stage | Stage 1 | Moving toward Stage 2 |
| Code Autonomy | Depends on OP Stack | Unified, independent codebase |
Industry Perspectives: Is ZK the Endgame or a Transitional Phase?
The introduction of ZK proofs on Base has sparked multi-layered debate both inside and outside the industry. The following summary draws on public statements, community discussions, and technical analyses.
Supporters: ZK Is the Inevitable Path for L2 Security
Brian Trunzo, Chief Growth Officer at Succinct Labs, described Base’s move as "the strongest vote of confidence for ZK proofs as the ultimate form of Ethereum scaling," signaling that the market now sees ZK as a strategic direction for ecosystem expansion.
Ethereum co-founder Vitalik Buterin has repeatedly described ZK-EVM as the "endgame" for Ethereum block verification, predicting such systems will become mainstream between 2027 and 2030. Base’s upgrade aligns closely with Buterin’s forecast.
From the technical community’s perspective, optimistic rollups rely on economic incentives and honest participation, while ZK proofs replace these trust assumptions with mathematical certainty. Several security researchers have noted that as L2 asset scales grow, the marginal effectiveness of pure game-theoretic security models diminishes—attackers’ incentives rise with TVL, but defenders’ incentives do not scale linearly.
Cautious Voices: The Complexity Risks of Hybrid Architectures
Not all industry participants fully endorse Base’s approach. Some technical analyses point out that Azul’s multi-proof system introduces TEE dependency—TEE essentially involves trusting hardware manufacturers, which can be at odds with the ethos of decentralization. If TEE security is compromised, the validation logic that relies on it could be affected.
Additionally, the cost of generating ZK proofs is a real constraint. Unlike optimistic rollups, which incur no computation unless challenged, ZK proofs require cryptographic computation for every submission. With L2 transaction fees already at very low levels, it remains unclear who will bear these incremental costs and whether they might impact transaction fees.
Community Perspective: Security Upgrades Amid Governance Controversy
It’s worth noting that Base has recently faced community scrutiny regarding how certain assets gained attention. Some users questioned whether specific projects received behind-the-scenes support. Base co-founder Jesse Pollak publicly responded, stating that the team does not and will never engage in price manipulation or private coordination to promote particular assets, and that such behavior could cross legal boundaries. While unrelated to the ZK upgrade itself, this controversy has added an extra layer of scrutiny to Base’s security narrative—when a network’s governance transparency is questioned, trust in its technical security upgrades can also be partially diluted.
Summary of Viewpoints
| Position | Core Viewpoint |
|---|---|
| Technical Optimists | ZK is the L2 security endgame; Base leads the paradigm shift |
| Gradual Reformers | Hybrid approach is pragmatic and stable; no rush to dismantle existing systems |
| Security Cautious | TEE introduces new trust assumptions; hybrid complexity increases risk |
| Cost-Conscious | ZK proof computation costs may impact L2’s long-term economic model |
Industry Impact Analysis: L2 Security Standards Are Being Redefined
Structural Impact on L2 Competitive Landscape
The significance of Base’s upgrade should not be seen merely as a technical iteration for a single network, but as a paradigm shift in L2 security standards.
First, it sets a new benchmark for L2 security upgrades. Before Base, some L2 networks had started exploring ZK proof integration—for example, Linea reduced ZK proof generation latency from about 30 minutes to 60 seconds; Optimism has also added validity proofs to its roadmap and established a strategic partnership with Succinct in February 2026. But with the largest TVL among L2s and $7.4 billion in deposits covered by proofs, Base has brought ZK verification to an unprecedented asset scale. This effectively sets an implicit security baseline for the entire L2 industry: when the largest L2 network adopts ZK proofs as a core security component, other networks maintaining pure optimistic rollup security narratives will face increasing scrutiny.
Second, it accelerates the convergence of optimistic and ZK proofs. The L2 sector is shifting from a "optimistic vs. ZK" binary debate to a collective embrace of "optimistic plus ZK" hybrid architectures. Emerging L2s like RISE have also adopted hybrid fraud proof systems. Base’s move will further accelerate this trend.
Third, it objectively advances L2 decentralization. L2BEAT’s decentralization framework defines Stage 2 as "fully trustless"—requiring on-chain fault detection and a sufficiently long exit window. The design in Base’s Azul upgrade, where ZK proofs can override TEE errors, directly addresses Stage 2’s requirement for "on-chain detection of proof system errors." While Base remains at Stage 1 for now, this upgrade lays the technical groundwork for advancing to Stage 2.
Impact on Ethereum L1–L2 Dynamics
Base’s ZK upgrade comes amid broader shifts in the relationship between Ethereum mainnet and L2s. L2s currently hold a combined TVL of roughly $32.3–43 billion. As L2 security standards shift toward ZK proofs, L2 governance and security infrastructure will become more complex, and the boundaries of responsibility between L1 and L2 will be redrawn. The Ethereum research community is discussing proposals like EIP-8025 and native proof verification, aiming to generalize L1 consensus proof infrastructure into a program-agnostic universal layer—a move that could fundamentally reshape L2 security architecture.
Conclusion
With the Azul upgrade, Base is integrating SP1 zero-knowledge proofs, shifting from a single optimistic proof model to a hybrid TEE + ZK multi-proof architecture. On an industry level, it establishes a new benchmark for the evolution of security standards in the Ethereum L2 ecosystem. Cryptographic protection for $7.4 billion in deposits, withdrawal times reduced from seven days to one, and ZK redundancy that can override TEE failures—all point to a clear trend: the security foundation of Ethereum L2s is moving from "game-theoretic trust" to "mathematical verification."
However, this shift is not the endgame. The trust assumptions inherent in TEE, the computational cost structure of ZK proofs, and long-term performance in real-world mainnet environments will all require ongoing observation and validation through future market cycles. L2 security is not achieved in a single moment, but is gradually approached through countless architectural choices, hard-earned lessons, and continuous iteration. With this step, Base brings the entire industry a little closer to that ideal.
