ARB
An optimistic rollup layer-2 for Ethereum that offers fast and cheap transactions with full EVM compatibility.
Arbitrum is an optimistic rollup layer-2 solution for Ethereum developed by Offchain Labs, founded by Ed Felten (former Deputy CTO of the White House), Steven Goldfeder, and Harry Kalodner. Arbitrum One launched in August 2021 and quickly became the largest Ethereum L2 by total value locked.
The ARB governance token was airdropped in March 2023, becoming one of the most successful airdrops in crypto history. Arbitrum has attracted the majority of DeFi activity among L2s, hosting major protocols like GMX, Camelot, and Radiant Capital.
Arbitrum also launched Arbitrum Orbit, allowing developers to create their own L3 chains on top of Arbitrum. This has attracted gaming projects like Xai and various DeFi applications seeking even more customized execution environments. Arbitrum Nova serves as a separate chain optimized for social and gaming applications.
Arbitrum uses optimistic rollup technology, where transactions are executed off-chain and the transaction data is posted to Ethereum. Transactions are assumed valid by default (hence 'optimistic'), with a 7-day challenge period during which anyone can submit a fraud proof if they detect an invalid state transition.
Arbitrum's Nitro upgrade introduced WASM-based fraud proofs and data compression, significantly reducing costs. The Stylus upgrade added support for smart contracts written in Rust, C, and C++ alongside Solidity, broadening the developer base. Arbitrum One handles general-purpose DeFi and dApps, while Arbitrum Nova uses a Data Availability Committee for even cheaper transactions suitable for gaming and social applications.
Both are optimistic rollups for Ethereum, but Arbitrum has higher TVL and more DeFi protocols, while Optimism has the OP Stack (used by Base, Mode, Zora). Arbitrum uses multi-round fraud proofs while Optimism uses single-round. Both offer similar fees and speeds.
Arbitrum Orbit allows developers to create custom L3 chains that settle on Arbitrum. These chains can be customized for specific use cases like gaming or enterprise applications, with the flexibility to choose their own gas token, data availability layer, and governance model.
Arbitrum inherits Ethereum's security through its optimistic rollup design. Transaction data is posted to Ethereum, and any invalid state transitions can be challenged through fraud proofs. The 7-day challenge period ensures that fraudulent transactions can be caught and reverted.
ARB's price performance is influenced by many factors including general market conditions, token unlock schedules (significant ARB is vesting to investors and team), and the broader L2 competitive landscape. Despite strong usage metrics, L2 tokens have generally underperformed relative to ETH.
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