Arbitrum

Arbitrum is an Ethereum Layer-2 network developed by Offchain Labs that uses optimistic rollup technology to scale transaction throughput while inheriting the security guarantees of the Ethereum mainnet. Transactions execute on the Arbitrum chain, with state commitments and call data posted back to Ethereum, where any participant can challenge invalid transitions through a fraud-proof mechanism during a defined window.

The network is fully compatible with the Ethereum Virtual Machine, allowing existing Solidity smart contracts to be deployed without modification and giving developers access to standard Ethereum tooling, wallets and indexers. The Arbitrum stack also includes Nitro, a Geth-based execution engine, and Stylus, a runtime that extends contract development to languages such as Rust, C and C++ that compile to WebAssembly.

The native ARB token is the governance asset of the network. Holders vote through the Arbitrum decentralized autonomous organization on protocol parameters, treasury allocations and upgrades to the rollup contracts deployed on Ethereum. The DAO directs ecosystem grants and other programs intended to support development on the network.

Within the broader crypto landscape, Arbitrum is among the most widely used Ethereum Layer-2 networks by total value locked and transaction volume, anchoring a substantial decentralized finance and consumer-application ecosystem.

Optimistic rollups scale Ethereum by executing transactions off the main chain and posting compressed state data back to Layer-1, with fraud proofs available to challenge invalid state transitions. This category competes with zero-knowledge rollups on cost, finality and developer ergonomics. For broader context on this market segment, explore trends across crypto and Web3.