We're excited to introduce opBNB, an innovative scalability solution now available on the BNB Smart Chain (BSC). opBNB represents our commitment to ensuring a seamless and efficient experience for users, developers, and projects on BSC. This development is part of our ongoing mission to bring the power of blockchain to everyone while embracing and driving forward innovation.

The opBNB Testnet will be launching on 19 June 2023! We're calling on testnet Validators and dApp Builders to try the Testnet and provide feedback.

What is opBNB?

opBNB is BSC's answer to the scalability challenge that has limited the mass adoption of blockchain technology. As an Ethereum Virtual Machine (EVM) compatible layer 2 chain, opBNB solution is based on Optimism OP Stack to further enhance BSC scalability while preserving affordability and security.

Optimistic Rollups was proposed to reduce the computational load on the main chain by executing transactions off-chain and only posting transaction data on-chain as calldata. This approach drastically improves scalability by bundling multiple transactions together before submitting them to the main chain.

The mix of BSC's strong ability and opBNB's dedicated new features, which includes making data access easier, improving the cache system, and adjusting the submission process algorithm to allow simultaneous operations (also known as batcher), allows OpBNB to push the gas limit up to a whopping 100M. This is a big jump from Optimism's 30M (source: link). Thanks to these new features, OpBNB can handle over 4000 transfer transactions each second and keep the average cost of a transaction below 0.005 USD.

Why opBNB Matters?

By harnessing the power of Optimistic Rollups, opBNB moves computation and state storage off-chain, alleviating congestion and driving down transaction costs. Transactions are executed outside of the chain but their data is posted to the Mainnet as calldata. This revolutionary approach enables a high throughput environment with lower gas fees.

Moreover, opBNB adopts a fraud-proving scheme to ensure the validity of transactions. Anyone can challenge the results of a rollup transaction by computing a fraud proof, and if successful, the transaction(s) will be re-executed, maintaining the network's integrity.

Benefits for Projects and Developers

With opBNB, developers gain access to a robust and EVM-compatible platform that allows for the creation of open ecosystems. The opBNB team has made significant contributions to the Optimism Stack to support the expansion of Layer 2 solutions. Utilizing this stack simplifies the process for EVM developers to move their applications over to BSC, which could help them reach even more users.

Projects can also take advantage of the improved throughput and significantly lower transaction costs, providing a better user experience for their customers. Furthermore, projects which have previously struggled with the burden of high transaction volumes on BSC, can thrive with opBNB's increased scalability. The following are a quick summary of the benefits of opBNB:

Enhanced Scalability : As mentioned, opBNB can support more than 4000 transfer transactions per second. All of this is possible due to opbnb innovations, which is composed of the optimization of the data accessibility, caching layer and the adjustment of the submission process algorithm to allow simultaneous operations (also known as batcher). This is a remarkable boost compared to the current capacity of BSC, making it ideal for applications with large daily active users.

As a result, developers won't have to worry about their projects clogging the network, thus ensuring smooth and uninterrupted operations. Furthermore, with the average transfer transaction cost dropping to less than USD 0.005, it becomes more feasible for developers to create and run applications, especially those that require high-frequency micro-transactions. Lower transaction costs can also attract more users, potentially increasing the adoption and success rate of your applications.

EVM Compatibility: Being EVM-compatible means that opBNB presents an accessible platform for developers familiar with Ethereum's tooling and dApps. This compatibility simplifies the migration or extension of existing Ethereum applications to BSC, providing a broader reach in terms of audience and resources. Developers can leverage this benefit to exploit the best of both Ethereum and BNB Smart Chain ecosystems.

Security and Trust: Security remains a cornerstone of opBNB, thanks to the fraud-proving scheme. This ensures that all off-chain transactions are valid, providing an added layer of trust and confidence for developers and users alike. Moreover, the transparency and verifiability of transactions on opBNB encourage a healthier and safer application environment.

Future-Proof Development: The blockchain space is rapidly evolving, and staying adaptable is key for sustained growth. With opBNB's robust and flexible framework, developers can easily adapt to changes, add new features, and experiment with innovative ideas. This makes opBNB not just a solution for now, but a strategic choice for the future.

Rich Ecosystem Integration: opBNB is not just a standalone layer 2 solution; it’s part of a broader and vibrant BSC ecosystem. This integration provides developers and projects with the opportunity to interact with a rich variety of other projects and tokens, including BNB, USDT, and other future ERC20 tokens supported on opBNB.

OpBNB has the potential to foster the growth of a diverse array of applications, from gaming dApps to social networks, thanks to the efficient and cost-effective blockchain environment it provides.

Let's Build Together

The launch of opBNB marks a new chapter in our journey towards creating a scalable, accessible, and cost-effective blockchain ecosystem.  This is, however, just the beginning.

We invite developers and projects to experiment with opBNB. Whether you are looking to build a high-volume decentralized application, gaming platform or a social network, opBNB offers an ideal environment for your creativity to flourish. Your contribution will not only benefit your project but also contribute to the broader BSC ecosystem and the future of blockchain technology.

Let's leverage the power of opBNB together to create a blockchain ecosystem that is efficient, scalable, and sustainable. The future is optimistic, and we're thrilled to shape it with you. Join the 19 June Testnet launch and start building on opBNB now!

BNB 智慧鏈（BSC）現已推出創新性擴容解決方案—opBNB，上線。 opBNB 是我們確保用戶、開發者和項目在 BSC 上獲得無縫且高效體驗的承諾。這個發展是我們不斷前進、引領創新的使命的一部分。 opBNB 測試網將於2023年6月19日啟動！我們誠邀測試網驗證人和 dApp 開發者嘗試測試網並提供反饋。

什麼是opBNB?

opBNB 是 BSC 可擴容性的解決方案。作為與以太坊虛擬機（EVM）兼容的第 2 層區塊鏈，opBNB 基於 Optimism OP Stack，進一步提升 BSC 的可擴容性。 opBNB 大大提高了 L1 的擴容性以減輕網路擁堵並降低交易成本，同時保持與 L1 相似的安全級別。

Optimistic Rollups 提出了通過在鏈外執行交易並僅將交易數據作為 calldata 發佈到主鏈的方式，以減輕主鏈上的計算負載。這種方法通過將多個交易捆綁在一起，然後將它們提交到主鏈，極大地提高了可擴容性。

結合 BSC 強大的能力以及 opBNB 的獨特的新功能，包括簡化數據使用、改進緩存系統以及調整提交過程算法以支援同時操作（也稱為批處理器），使得 opBNB 能夠將 Gas 限制提升到 1 億。與 Optimism 的 30 萬相比（來源：鏈接），這是一個巨大的進步。憑藉這些新功能，opBNB 每秒可以處理超過 4000 個轉帳交易，並且每筆交易的平均成本低於 0.005 美元。

為什麼 opBNB 很重要？

透過利用 Optimistic Rollups 的力量，opBNB 將計算和狀態儲存轉移到鏈外，從而減輕擁堵並降低交易成本。交易在鏈外執行，但其數據作為 calldata 發佈到主網。這種革命性的方法以較低的 Gas 費用實現了高吞吐量環境。

此外，opBNB 採用了一種欺詐證明方案，以確保交易的有效性。任何人都可以通過計算欺詐證明來質疑 rollup 交易的結果，如果成功，將重新執行該筆交易，以保持網路的完整性。

對項目和開發人員的好處

憑藉 opBNB，開發者可以獲得一個強大且與 EVM 兼容的平台，可以建立開放生態系統。 opBNB 團隊在支援第二層解決方案的 Optimism Stack 方面做出了重要貢獻。利用這個堆疊簡化了 EVM 開發者將其應用程式遷移到 BSC 的過程，從而幫助他們觸達更多用戶。

項目也可以利用提高的吞吐量和顯著降低的交易成本，為其客戶提供更好的用戶體驗。此外，之前在 BSC 上面臨高交易量負擔的項目，可以藉助 opBNB 的增加可擴容性而蓬勃發展。以下是 opBNB 的一些好處：

1. 增強的可擴容性：如上所述，opBNB 每秒可以支援超過 4000 個轉帳交易。這得益於 opBNB 的創新功能，包括優化數據瀏覽、改進緩存系統以及調整提交過程算法以支援同時操作（也稱為批處理器）。相對於目前 BSC 的容量而言，這是一個顯著的提升，使其非常適合擁有大量日活躍用戶的應用程式。因此，開發者無需擔心其項目會擁堵網絡，從而確保平穩無間斷的運行。此外，隨著平均轉帳交易成本降至低於 0.005 美元，開發者更容易創造和運行應用程式，特別是那些需要高頻率微交易的應用程式。更低的交易成本還可以吸引更多用戶，可能增加應用程式的採用率和成功率。

2. EVM 兼容性：與 EVM 兼容意味著 opBNB 為熟悉以太坊工具和 dApp 的開發人員提供了一個可用的平台。這種兼容性簡化了現有以太坊應用程式向 BSC 的遷移或擴容，提供了更廣泛的受眾和資源。開發人員可以利用這一優勢來充分利用以太坊和 BNB 智慧鏈生態系統。

3. 安全和信任：由於欺詐證明方案，安全仍然是 opBNB 的基石。這確保了所有鏈下交易都是有效的，為開發人員和用戶等提供了一層額外的信任和信心。此外，opBNB 上交易的透明度和可驗證性鼓勵更健康、更安全的應用環境。

4. 面向未來的發展：區塊鏈空間正在迅速發展，保持適應性是持續增長的關鍵。藉由 opBNB 強大而靈活的框架，開發人員可以輕鬆適應變化、添加新功能並試驗創新想法。這使得 opBNB 不僅僅是現在的解決方案，而是未來的戰略選擇。

5. 豐富的生態系統集成：opBNB 不僅僅是一個獨立的第 2 層解決方案； 它是更廣泛和充滿活力的 BSC 生態系統的一部分。這種集成為開發人員和項目提供了與各種其他項目和代幣交互的機會，包括 BNB、USDT 和 opBNB 支援的其他未來 ERC20 代幣。

opBNB 具有促進各種應用程式增長的潛力，從遊戲 dApp 到社交網路，這要歸功於它提供的高效且具有成本效益的區塊鏈環境。

讓我們一起建設

opBNB 的推出標誌著我們在建立具有可擴容、可用性且有成本效益的區塊鏈生態系統的旅程中翻開了新的篇章。然而，這僅僅是開始。

我們邀請開發者和項目來試驗 opBNB。無論您是想構建一個大容量的去中心化應用程式、遊戲平台還是社交網絡，opBNB 都能為您的創造力提供一個理想的環境。您的貢獻不僅將有利於您的項目，還將為更廣泛的 BSC 生態系統和區塊鏈技術的未來做出貢獻。

讓我們一起利用 opBNB 的力量來創造一個高效、可擴容和可持續的區塊鏈生態系統。未來是樂觀的，我們很高興與您一起塑造它。加入 6 月 19 日的測試網發布並立即開始在 opBNB 上構建！嘗試測試網後，有多個論壇可以提交您的回饋。