Across Protocol – the crosschain EVM bridge built and secured by UMA – introduces Composable Bridging, exclusive to ETHGlobal Istanbul hackers. Composable bridging = bundled bridging + action messages. Don't just bridge tokens – fulfill intents crosschain, like bridging and swapping, or buying an NFT from another chain. It allows custom messages with token transfers, completed by relayers in seconds. Messages and token transfers are atomic on the destination chain, with costs proportional to the bridged token. Across is the bridge Ethereum deserves.