The cross protocol is a novel bridging method that combines optimistic oracles, bound relays, and unilateral liquidity pools to provide decentralized instant transactions from the aggregation chain to the Ethereum mainnet. Across collects liquidity pools of ERC20 tokens on Ethereum to facilitate rapid withdrawal of token deposits on Layer 2 (L2) networks such as Optimism and Arbitrum. Deposits on Layer 2 are one-way, sent to pools on Ethereum by slow local bridges of the L2 network, repaying ...