Arbitrum (ARB)

Ethereum at full speed. Without the fees.

What is Arbitrum?

Arbitrum is the leading Ethereum Layer 2 rollup, designed to make Ethereum transactions faster and dramatically cheaper while inheriting its security. Instead of processing every transaction on Ethereum's mainnet, Arbitrum bundles them together and posts compressed proofs back to Ethereum — giving users the same security guarantees at a fraction of the cost.

The network hosts hundreds of DeFi protocols, NFT platforms, and applications that were too expensive to run on Ethereum mainnet. Arbitrum One, its flagship chain, has consistently been the most active Layer 2 by total value locked and transaction volume.

ARB is the governance token of the Arbitrum ecosystem. Holders vote on protocol upgrades, treasury spending, and the direction of Arbitrum DAO — one of the largest and most active DAOs in crypto.

How Arbitrum Works

Imagine Ethereum as a busy courthouse where every case takes time and costs money. Arbitrum is like a private mediation office that handles cases quickly and cheaply, but files the final verdict back at the courthouse for the official record. Transactions happen fast on Arbitrum, and if anyone disputes the result, Ethereum acts as the judge. This "optimistic rollup" approach assumes everything is valid unless challenged — which keeps things fast while preserving Ethereum's security.

Arbitrum Ecosystem

Largest Layer 2 ecosystem by TVL with hundreds of DeFi protocols
Arbitrum One for general-purpose applications and DeFi
Arbitrum Nova for high-throughput, low-cost gaming and social apps
Orbit chains — custom L3s built on Arbitrum technology
Governance through Arbitrum DAO and delegate voting

Team & Development

Arbitrum was created by Offchain Labs, founded by Ed Felten (former White House Deputy CTO), Steven Goldfeder, and Harry Kalodner — all Princeton computer scientists. The technology emerged from years of academic research on optimistic rollups. Offchain Labs builds the core protocol, while Arbitrum DAO governs the ecosystem.

Frequently Asked Questions

What is ARB used for?

ARB is the governance token for Arbitrum DAO. Holders can vote on proposals that affect the protocol, including upgrades, treasury grants, and ecosystem incentives. Gas fees on Arbitrum are paid in ETH, not ARB.

How do I use Arbitrum?

Add the Arbitrum One network to MetaMask, bridge some ETH to Arbitrum, and start using apps. Many DeFi protocols like Uniswap, Aave, and GMX are already deployed on Arbitrum with the same interfaces you know.

Is Arbitrum as secure as Ethereum?

Arbitrum inherits Ethereum's security through its optimistic rollup design. All transaction data is posted to Ethereum, and there is a challenge period during which anyone can dispute an invalid state. This gives users Ethereum-level security guarantees.

What is the difference between Arbitrum One and Nova?

Arbitrum One is the main rollup for DeFi and general-purpose applications. Arbitrum Nova uses a Data Availability Committee for even cheaper transactions, making it ideal for gaming and social applications where cost matters more than maximum decentralization.

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