> ## Documentation Index
> Fetch the complete documentation index at: https://docs.base.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> Overview of the Azul hardfork, introducing Osaka EVM support, a simplified execution client, and a multi-proof system for L2 checkpoints.

## Summary

<Warning>
  Only `base-consensus` and `base-reth-node` will support the Base Azul hardfork. If you are running `op-node`, `op-geth` or any other clients you will need to update prior to the activation date.
</Warning>

* Add Osaka Support
* Simplify Flashblocks Websocket Format
* Enable a new multi-proof system for faster withdrawals and a path to stronger decentralization
* Only Base Node Reth / Base Consensus will be supported

## Activation Timestamps

| Network   | Timestamp    | Date                    |
| --------- | ------------ | ----------------------- |
| `mainnet` | `1779991200` | 2026-05-28 18:00:00 UTC |
| `sepolia` | `1776708000` | 2026-04-20 18:00:00 UTC |

## Required Software

| Layer          | Software         | Mainnet                                                       | Sepolia                                                       |
| -------------- | ---------------- | ------------------------------------------------------------- | ------------------------------------------------------------- |
| Execution (EL) | `base-reth-node` | [v0.9.0+](https://github.com/base/base/releases/tag/v0.9.0)   | [v0.7.0+](https://github.com/base/base/releases/tag/v0.7.0)   |
| Consensus (CL) | `base-consensus` | [v0.9.0+](https://github.com/base/base/releases/tag/v0.9.0)   | [v0.7.0+](https://github.com/base/base/releases/tag/v0.7.0)   |
| -              | `base/node`      | [v0.16.0+](https://github.com/base/node/releases/tag/v0.16.0) | [v0.15.0+](https://github.com/base/node/releases/tag/v0.15.0) |

See the [Node Upgrade Guide](/base-chain/specs/upgrades/azul/node-upgrade) for full migration instructions.

## Execution Layer

* [EIP-7823: Upper-Bound MODEXP](/base-chain/specs/upgrades/azul/exec-engine#upper-bound-modexp)
* [EIP-7825: Transaction Gas Limit Cap](/base-chain/specs/upgrades/azul/exec-engine#transaction-gas-limit-cap)
* [EIP-7883: MODEXP Gas Cost Increase](/base-chain/specs/upgrades/azul/exec-engine#modexp-gas-cost-increase)
* [EIP-7939: CLZ Opcode](/base-chain/specs/upgrades/azul/exec-engine#clz-opcode)
* [EIP-7951: secp256r1 Precompile](/base-chain/specs/upgrades/azul/exec-engine#secp256r1-precompile-gas-cost)
* [EIP-7642: eth/69](/base-chain/specs/upgrades/azul/exec-engine#eth69)
* [EIP-7910: eth\_config RPC Method](/base-chain/specs/upgrades/azul/exec-engine#eth_config-rpc-method)
* [Remove Account Balances & Receipts](/base-chain/specs/upgrades/azul/exec-engine#remove-account-balances--receipts)
* [Use `basev0` protocol ID for discv5](/base-chain/specs/upgrades/azul/exec-engine#discovery-protocol-now-uses-basev0-protocol-id)

## Proofs

* [Proof System](/base-chain/specs/upgrades/azul/proofs)
* [New/Changed Onchain Components](/base-chain/specs/upgrades/azul/proofs#newchanged-onchain-components)
* [Proposer](/base-chain/specs/upgrades/azul/proofs#proposer)
* [Challenger](/base-chain/specs/upgrades/azul/proofs#challenger)
* [TEE Provers](/base-chain/specs/upgrades/azul/proofs#tee-provers)
* [ZK Provers](/base-chain/specs/upgrades/azul/proofs#zk-provers)
* [Prover Registrar](/base-chain/specs/upgrades/azul/proofs#prover-registrar)