There are increasingly more projects based on the Ethereum ecosystem, but the low throughput and expensive transaction fees in the native ecosystem have become a problem. As a result, there have been various Ethereum L2 Rollup scaling solutions on the market, such as Arbitrum One, Arbitrum Nova, Optimism, zkSync, StarkNet, Linea, Base, Scroll, Taiko, Polygon zkEVM, opBNB and BNB chain. In the future, there will be more and more DAPP projects based on L2, and users will have higher demands for asset transfers. They need a user-friendly, safe, and inexpensive asset transfer tool, which we call a Cross-Rollup bridge product.

In the Layer2 framework, Rollups cannot be directly transferred between each other. If users want to transfer assets from Rollup A to Rollup B, they must first transfer the assets from Rollup A to the mainnet, then transfer them from the mainnet to Rollup B, and pay high gas fees.

Such asset transfers between different Layer2 networks are not only expensive, but also time-consuming, which does not meet users' expectations for the future of Web3. As the demand for Layer2 Cross-Rollup asset transfers increases, there will be more Cross-Rollup opportunities.

Overall, Ethereum's Cross-Rollup bridge products have a wide range of applicable scenarios in handling high throughput, reducing transaction fees, and improving user experience. This includes but is not limited to DeFi applications, NFT markets, DEXs, cross-chain asset transfers, games, and Metaverse. By introducing Cross-Rollup bridge products, the scalability and transaction fee limitations of the Ethereum mainnet can be solved, which will promote more applications and user participation in the Ethereum ecosystem, and further promote the development and innovation of the blockchain industry.

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