Overview

Cobalt improves the B20 token standard, adds validity transactions, introduces dynamic node upgrades, and migrates Base to a Trusted Execution Environment.

	Status	Date
Sepolia	Planning	September 2026
Mainnet	Planning	September 2026

Features

B20 Improvements

Base · Precompile

Cobalt brings improvements to the B20 token standard: pay transaction fees in B20s, schedule multiplier updates, transfer blocked simplification, and new Union and Intersect policies.

Validity Transactions

Base · Transactions

Cobalt introduces validity transactions to Base. Detailed specifications will be published as the feature is finalized.

Dynamic Upgrades

Base · RPC

Dynamic Upgrades introduces an Ethereum smart contract that stores upgrade timestamps for Base nodes, allowing nodes to query the contract and apply changes live. This change will be rolled out in metrics-only mode on Mainnet as data is collected to validate that the upgrades work smoothly.

TEE Migration

Base · Infrastructure

Cobalt migrates Base infrastructure to run inside a Trusted Execution Environment (TEE). Detailed specifications will be published as the feature is finalized.