Recent Updates on ArbitrumMarch 5th: Robinhood announced that it will soon list Arbitrum (ARB)!March 4th: DeriW, an Arbitrum-based Layer 3, announced the launch of its testnet. DeriW's security is guaranteed by Layer 2, which in turn is backed by Ethereum.Introduction to ArbitrumArbitrum is a Layer 2 scaling solution for Ethereum, created by the Offchain Labs team using Optimistic Rollup technology. It began testing in May 2021 and officially launched in late August, quickly becoming the chai...