Arbitrum
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Ethereum's premier L2 scaling solution, join the community while representing your favorite projects.
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ArbOS Elara upgrade goes live on Arbitrum
Following approval through Arbitrum governance, the ArbOS Elara upgrade is now live on the Arbitrum Platform, adding new capabilities for dedicated blockchains and improvements to Arbitrum One. For dedicated blockchains it introduces protocol-level compliance filtering, customizable priority fees, and an alternative data API; on Arbitrum One the change brings a more efficient base fee.
Arbitrum BoLD protocol launches on mainnet
The Bounded Liquidity Delay (BoLD) dispute protocol went live on Arbitrum One and Nova, replacing allow-listed validators with a permissionless system that lets anyone participate in network validation and fraud proofs.
Arbitrum Stylus launches on mainnet
Stylus, a backward-compatible virtual machine enabling smart contract development in WebAssembly languages (Rust, C, C++) alongside Solidity, went live on Arbitrum One and Nova mainnet.
AIP-1 governance crisis and Foundation backtrack
The Arbitrum Foundation's first governance proposal, AIP-1, which would have given it control over 750 million ARB tokens (~$1B), sparked community revolt. The Foundation backtracked the same week and agreed to split the proposal into separate votes.
ARB token airdrop and Arbitrum DAO governance launch
The Arbitrum Foundation airdropped the ARB governance token to eligible early users and launched the Arbitrum DAO, transitioning governance of Arbitrum One and Nova to token holders.
Offchain Labs acquires Prysmatic Labs
Offchain Labs acquired Prysmatic Labs, the core engineering team behind Ethereum's leading consensus client (Prysm), which played a central role in Ethereum's Merge to proof-of-stake.
Arbitrum Nitro upgrade goes live on mainnet
Arbitrum One migrated to the Nitro stack, delivering roughly 7-10x higher throughput, advanced calldata compression, and lower transaction fees.
Arbitrum Nova chain launches
Arbitrum Nova, a new chain built on AnyTrust technology optimized for gaming and social applications with ultra-low fees, launched and opened to the public.
Arbitrum One public mainnet launch and $120M Series B
Arbitrum One opened to the public as an Ethereum Layer 2 rollup. Simultaneously, Offchain Labs announced a $120 million Series B led by Lightspeed Venture Partners at a $1.2 billion valuation.
Arbitrum One mainnet beta opens for developers
Arbitrum One, the project's flagship L2 chain, launched its mainnet beta on Ethereum, initially open to developers who had requested access.
Arbitrum Rollup testnet goes live
Offchain Labs launched the first fully functional EVM-compatible Optimistic Rollup testnet on Ethereum, allowing developers to deploy Solidity contracts with lower costs.
Offchain Labs raises $3.7M seed round
Offchain Labs, the Princeton-spawned startup building Arbitrum, closed a $3.7 million seed round led by Pantera Capital to develop its Ethereum scaling solution.