Ethereum News
Base reaches Stage 1 decentralization with fault proofs
Base achieved Stage 1 decentralization by launching permissionless fault proofs and a decentralized Security Council. This milestone moves the network from Stage 0, or full training wheels, to Stage 1, which is limited training wheels. Fault proofs allow anyone to propose claims about the state of Base and challenge invalid withdrawals without needing permission from a central party. The Security Council contains 10 independent entities from various jurisdictions. To implement an upgrade, the Security Council, Optimism, and Base must reach a 75% approval threshold. This setup ensures no single entity controls the upgrade process alone. The platform can no longer change the rules unexpectedly for builders.
Fault proofs allow users to challenge potentially fraudulent or incorrect transactions. If a claim is made, anyone can challenge it within 3.5 days by running open-source challenger software. This capability increases decentralization by allowing permissionless withdrawals from Base L2 to Ethereum L1. Base processes transactions off-chain and posts compressed calldata to Ethereum for data availability. The sequencer orders and executes the transactions before the system batches them together using zlib. Once a batch is posted to Ethereum, a 3.5-day challenge window opens for any user to submit a fraud proof. If no one challenges the claim, the batch is finalized. The 1-2 challenger key structure lets the Base team or the Optimism Foundation delete invalid output proposals, ensuring the validity of output proposals while preventing singular control.
Unified architecture and economic shifts
The network architecture changed when Base moved toward a unified stack. On February 18, 2026, Coinbase announced it would depart from the OP Stack to eliminate the 12% revenue share previously sent to the Optimism Protocol. This shift allows Coinbase to retain 100% of sequencer fees. The migration consolidated the sequencer, consensus client, and fault proof system into a single Reth-based binary. This new architecture provides faster shipping cadences by supporting six hard forks per year instead of three. The migration reduces cognitive overhead for developers because they no longer need to cross-reference documentation across multiple repositories.
| Feature | Stage 1 Specification |
|---|---|
| Fault Proof Window | 3.5 days |
| Security Council Members | 10 independent entities |
| Upgrade Approval Threshold | 75% |
| Consensus Client | base-consensus |
| Execution Client | Reth (base-reth-node) |
| Sub-block ordering | 200ms (Flashblocks) |
The migration to the unified base/base architecture allows the network to deploy high-impact Ethereum Improvement Proposals like BAL ahead of the L1 to generate data that informs the entire Ethereum roadmap. Developers use the Reth execution client, which offers faster block building performance than previous options. Flashblocks, a preconfirmation system from Flashbots, issues sub-blocks every 200 milliseconds. These sub-blocks provide inclusion signals to applications almost immediately, meaning developers receive confirmation of execution within milliseconds. However, transactions in a Flashblock are not final until the full block is sealed. Base reached $4.53 billion in DeFi TVL in April 2026, and in 2025, the chain generated $75.4 million in gross sequencer revenue, which is 30x year-over-year growth. The network processes approximately 10.7 million transactions per day.
Risks and ecosystem participation
Builders and users must navigate specific vulnerabilities in the current setup. The 2-2 contract upgrade multisig requires both the Base Upgrade Multisig and the Optimism Foundation Multisig to prevent any single entity from triggering smart contract upgrades. If both signers agree, they can change the smart contracts that hold billions of dollars instantly. This remains a risk because no community review window exists before an upgrade executes. The centralized sequencer also creates a single point of failure. Coinbase alone decides which transactions enter the network and in what order.
The ecosystem provides several ways to participate in onchain activity. DeFi users can provide liquidity to Aerodrome, which controls 59.5% of all decentralized trading volume on Base. Morpho V1 holds $2.52 billion in TVL, while Aave V3 holds $755.8 million. Users can also hold USDC to earn yield. You should monitor the 3.5-day challenge window if you rely on the fault proof system for withdrawals. The Security Council includes 10 independent entities from various jurisdictions. This setup prevents a single entity from controlling the upgrade process. Will the network reach Stage 2 status before the sequencer centralization becomes a larger issue for developers?
