Offchain Labs, the firm building out the Arbitrum ecosystem, launched Arbitrum BOLD on testnet. 

The Bounded Liquidity Delay, or BOLD, is a dispute protocol with interactive fraud proofs for optimistic rollups, which can be used across Arbitrum chains. BOLD lets users operate a validator node and help facilitate the network's consensus process. It also implements defenses against delay attacks, or a cybersecurity threat in which a bad actor intentionally delays a system's normal functioning by disrupting data flow.

"BOLD guarantees a fixed upper-bound on the confirmation of Arbitrum states on Ethereum and allows a single, well-resourced party to defend claims against many adversaries without needing to play 1-vs-1 games against them," wrote Offchain Labs in a Monday statement.

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