\u00b7 Table Of Contents<\/a> Layer 2 solutions are transforming Ethereum by addressing its scalability limitations. Among these, rollups have emerged as the most effective way to enhance transaction speed and reduce costs while maintaining Ethereum\u2019s security and decentralization.<\/p>\n Ethereum, Bitcoin and Solana are examples of L1 blockchains<\/p>\n Layer 1 (L1) blockchains<\/strong> serve as the foundation<\/strong> of blockchain networks, executing and validating transactions independently without relying on external systems. Examples include Bitcoin, Ethereum, and\u00a0Solana<\/strong>.<\/p>\n Optimism, Arbitrum and Starknet are examples of L2 blockchain for Ethereum\u00a0L1<\/p>\n In contrast, Layer 2 (L2) solutions<\/strong> are built on top of Layer 1 blockchains to improve scalability<\/strong> and efficiency<\/strong>. They process transactions off-chain and periodically record summaries on the underlying L1 blockchain. For instance, Optimism, Arbitrum and Starknet <\/strong>operate as L2 solutions on Ethereum<\/strong>, enhancing its transaction speed and reducing\u00a0costs.<\/p>\n Blockchains strive to achieve three key attributes: security, decentralization, and scalability<\/strong>. However, the well-known blockchain trilemma<\/strong> suggests that a system can optimize only two of these at a time, requiring a trade-off on the\u00a0third.<\/p>\n Ethereum, along with Bitcoin and other Layer 1 blockchains, has historically prioritized security<\/strong> and decentralization<\/strong> over scalability<\/strong>, which has led to the development of Layer 2 (L2) solutions<\/strong> designed to address the scalability gap in Layer 1 networks.<\/p>\n Transaction fees and wait times rise linearly with the number of people using Ethereum\u200a\u2014\u200athat is, the more people using Ethereum at any given time, the slower and more expensive transactions become.<\/p>\n This creates a barrier for the development and adoption of applications that rely on fast transactions and low costs, especially when serving large user\u00a0bases.<\/p>\n To put this in perspective, the Ethereum mainnet<\/strong> processes only 13 transactions per second (TPS), whereas Visa<\/strong> handles around 1,700 TPS. Clearly, 13 TPS is insufficient for most applications.<\/p>\n So why not simply increase the number of transactions per block on Ethereum? <\/strong>Increasing Ethereum\u2019s block size could raise the cost of running nodes, discouraging decentralization. Larger blocks also destabilize consensus by being harder to process, slower to propagate, and requiring more bandwidth, potentially causing nodes to fall behind and resulting in consensus failures or temporary forks.<\/p>\n Layer 2 (L2) solutions were developed to tackle these challenges by shifting most of the computational workload involved in processing transactions from the main blockchain (Layer 1) to a secondary layer. A Layer 2 solution will use an external, parallel network to facilitate transactions away from the mainchain. This approach significantly boosts transaction throughput, lowers costs, and enhances the overall user experience\u200a\u2014\u200aall while maintaining the security and decentralization of the underlying L1 blockchain.<\/p>\n The Layer 2 (L2) ecosystem includes a diverse range of technologies and frameworks, each with its own distinct features. The most notable are rollups<\/strong>, state channels<\/strong>, and plasma<\/strong>. However, this article will primarily focus on rollups<\/strong>, as they have emerged as the most effective L2 solution for scaling Ethereum.<\/p>\n How L2 rollups\u00a0works<\/p>\n Rollups enhance Layer 1 (L1) scalability by offloading most of the heavy computation to a secondary layer (Layer 2, or L2). Instead of processing transactions one by one on L1, rollups handle them on L2, where it\u2019s more cost-effective. They then group multiple transactions into a single, compressed summary and submit it to L1 for verification.<\/p>\n This approach provides several benefits:<\/p>\n Lower transaction costs<\/strong>: Transactions are processed on a more affordable layer, and by bundling them, rollups help reduce L1 expenses.Faster transaction processing<\/strong>: With fewer limitations (such as block-size restrictions and L1 gas fees), transactions on L2 can be processed more quickly and then settled on L1 in\u00a0bulk.Greater functionality<\/strong>: Rollups enable the introduction of features and functionalities that may be inefficient or impossible to implement directly on L1, like advanced smart contracts or privacy enhancements.<\/p>\n Rollups are categorized into two main types: optimistic rollups<\/strong> and validity rollups<\/strong>. Both enhance scalability while preserving the security and decentralization of Layer 1 (L1), but they differ in their validation mechanisms.<\/p>\n Optimistic Rollups<\/strong>: These assume all transactions are valid by default. To prevent fraud, they include a dispute-resolution system, allowing anyone to challenge a transaction within a set period (typically up to a week). If a fraudulent transaction is detected, a \u201cfraud proof\u201d is submitted to prove the\u00a0error.Validity Rollups<\/strong>: Instead of relying on disputes, validity rollups require operators to submit a cryptographic proof verifying the correctness of every transaction in a batch before it is finalized on\u00a0L1.<\/p>\n The key difference is that optimistic rollups depend on human intervention to catch fraud, while validity rollups rely on mathematical proofs, making them inherently more secure. Additionally, since validity rollups do not require a challenge period, they achieve near-instant finality on L1, whereas optimistic rollups may take up to a\u00a0week.<\/p>\n Starknet<\/strong>: avalidity rollup with native account abstraction, and its own programming language (Cairo) that optimizes for leveraging validity\u00a0proofs.zkSync<\/strong>: Another leading validity rollup with native account abstraction that runs on the Ethereum Virtual Machine\u00a0(EVM).Scroll<\/strong>: An EVM-compatible validity rollup that focuses on native-level compatibility with existing Ethereum dApps and\u00a0tools.Polygon zkEVM<\/strong>: Built by L2 scaling veteran Polygon, zkEVM is an EMV-compatible validity\u00a0rollup.Linea<\/strong>: Powered by Consensys, the company behind MetaMask, Linea is a validity rollup available directly via MetaMask.<\/p>\n Arbitrum<\/strong>: The largest optimistic rollup in terms of TVL, and EMV-compatible.Optimism<\/strong>: The second-largest optimistic rollup in terms of TVL, and EMV-compatible.Base<\/strong>: The third largest optimistic rollup in terms of TVL, and EMV-compatible.<\/p>\n Since L2s are separate blockchains from Ethereum L1, moving assets like ETH or other ERC-20 tokens between L1 and L2 requires using a bridge. Bridges facilitate this process by locking assets on one chain and minting equivalent representations on the other. For example, when transferring ETH from Ethereum to an L2 like Arbitrum, a bridge locks the ETH on the Ethereum mainnet and issues an equivalent amount of ETH on Arbitrum.<\/p>\n As Ethereum adoption grows, Layer 2 rollups play a crucial role in ensuring scalability without sacrificing security or decentralization. By leveraging rollups, we move closer to a more efficient and accessible blockchain ecosystem.<\/p>\n Why validity rollups are the future of blockchain<\/a>The Layer 2 ecosystem: Scaling blockchain for the\u00a0future<\/a>Blockchain Layer 1 vs. Layer 2 Scaling Solutions<\/a>What are Layer 2 scaling solutions?<\/a>Cross-Chain Bridges<\/a>Scaling<\/a>Optimistic Rollups<\/a>Zero-Knowledge Rollups<\/a><\/p>\n Scaling Ethereum with Layer 2 Rollups: Faster, Cheaper Transactions Explained<\/a> was originally published in Coinmonks<\/a> on Medium, where people are continuing the conversation by highlighting and responding to this story.<\/p>","protected":false},"excerpt":{"rendered":" Table Of\u00a0Contents \u00b7 Table Of Contents\u00b7 Introduction\u00b7 Understanding Layer 1 and Layer 2 Blockchains\u00b7 The Blockchain Trilemma\u00b7 The scalability challenge\u00b7 The Role of Layer 2 Solutions in Scaling L1 Blockchains\u00b7 Understanding Rollups\u00b7 Types of Rollups: Optimistic vs. Validity\u00b7 Validity rollups (aka zero-knowledge rollups)\u00b7 Optimistic rollups\u00b7 Bridging Tokens\u00b7 Conclusion\u00b7\u00a0Sources Introduction Layer 2 solutions are transforming Ethereum […]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-43807","post","type-post","status-publish","format-standard","hentry","category-interesting"],"_links":{"self":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/posts\/43807"}],"collection":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=43807"}],"version-history":[{"count":0,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/posts\/43807\/revisions"}],"wp:attachment":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=43807"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=43807"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=43807"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\u00b7 Introduction<\/a>
\u00b7 Understanding Layer 1 and Layer 2 Blockchains<\/a>
\u00b7 The Blockchain Trilemma<\/a>
\u00b7 The scalability challenge<\/a>
\u00b7 The Role of Layer 2 Solutions in Scaling L1 Blockchains<\/a>
\u00b7 Understanding Rollups<\/a>
\u00b7 Types of Rollups: Optimistic vs. Validity<\/a>
\u00b7 Validity rollups (aka zero-knowledge rollups)<\/a>
\u00b7 Optimistic rollups<\/a>
\u00b7 Bridging Tokens<\/a>
\u00b7 Conclusion<\/a>
\u00b7\u00a0Sources<\/a><\/p>\nIntroduction<\/h3>\n
Understanding Layer 1 and Layer 2 Blockchains<\/h3>\n
The Blockchain Trilemma<\/h3>\n
The scalability challenge<\/h3>\n
The Role of Layer 2 Solutions in Scaling L1 Blockchains<\/h3>\n
Understanding Rollups<\/h3>\n
Types of Rollups: Optimistic vs.\u00a0Validity<\/h3>\n
Validity rollups (aka zero-knowledge rollups)<\/strong><\/h3>\n
Optimistic rollups<\/strong><\/h3>\n
Bridging Tokens<\/h3>\n
Conclusion<\/h3>\n
Sources<\/h3>\n