Offchain Labs

Offchain Labs was founded in 2018 by Princeton computer scientists Steven Goldfeder, Ed Felten, and Harry Kalodner to scale Ethereum with optimistic rollups. The company builds Arbitrum, which executes transactions off-chain and posts results to Ethereum, relying on interactive fraud proofs to keep the rollup honest while inheriting Ethereum security at far lower cost. Arbitrum One launched to the public in 2021 and has grown into one of the highest-TVL Ethereum Layer 2 networks. Robinhood's tokenized stocks settle on Arbitrum One, and Robinhood Chain — built on the Arbitrum Orbit framework — opened its public testnet in February 2026 with mainnet expected later in 2026; the Timeboost transaction-ordering mechanism has also become a meaningful revenue source for the ecosystem. In 2021 Offchain Labs raised a $120 million Series B led by Lightspeed Venture Partners at a reported $1.2 billion valuation. The protocol is now governed by the Arbitrum DAO, with Offchain Labs continuing as a core developer.