Description: Optimistic rollups are a layer 2 scaling solution that assumes transactions are valid by default, improving scalability and interoperability. This technique allows multiple transactions to be bundled into a single one, which is then recorded on the main chain, reducing data load and improving efficiency. Unlike other scaling methods, such as zk (zero-knowledge) rollups, which require cryptographic proofs to validate transactions, optimistic rollups rely on the premise that most transactions are legitimate. This means that instead of verifying each transaction individually, their validity is assumed, and a time period is allowed for users to challenge any suspicious transaction. This feature not only improves processing speed but also reduces transaction costs, making it attractive for developers and users. Additionally, optimistic rollups are interoperable with various blockchains, facilitating communication and data exchange between different platforms, thus enhancing the blockchain ecosystem as a whole.
History: Optimistic rollups were first proposed in 2018 as a solution to improve Ethereum’s scalability. Since then, they have evolved and been implemented across various platforms, standing out for their ability to handle a large volume of transactions at a reduced cost. The developer community has worked on optimizing these systems, leading to increased adoption and the creation of specific projects utilizing this technology.
Uses: Optimistic rollups are primarily used to enhance the scalability of blockchain networks, allowing decentralized applications (dApps) to handle a higher number of transactions without congesting the main chain. They are also applied in the realm of decentralized finance (DeFi), where transaction speed and cost are critical. Additionally, they facilitate interoperability between different blockchains, enabling assets and data to be transferred more efficiently.
Examples: A notable example of optimistic rollups is Arbitrum, which allows developers to build scalable dApps on Ethereum. Another case is Optimism, which also focuses on improving transaction efficiency on blockchain networks, offering lower fees and faster confirmation times.
