<h2>What are Testnets?</h2><p>Testnets are alternative blockchain networks that replicate the functionalities of the Mainnet (live blockchain) but operate with test Ether or other tokens that hold no real-world value. They serve as a safe space for developers to test and iterate on their projects without the risk of losing real assets. Testnets are crucial for ensuring the security, efficiency, and functionality of smart contracts and DApps.</p><h2>Testnet vs Mainnet</h2><p>While Testnets and Mainnets are essentially the same from a technical standpoint, the key difference lies in their purpose and the value carried by their native tokens.</p><h3><strong>Mainnet</strong></h3><p>A Mainnet is the primary network where the application will finally operate. Every operation in the Mainnet affects real assets and involves real costs. Therefore, it's important to ensure that the applications are free of any critical issues that could lead to financial loss or security vulnerabilities.</p><h3><strong>Testnet</strong></h3><p>In contrast, a Testnet is a clone of the Mainnet but operates separately. The tokens used in a Testnet have no real value, allowing developers to deploy and interact with their applications freely. This mitigates the risks of losing value while debugging or learning about Dapp development.</p><h2>Popular Testnets:</h2><p>There are several popular Testnets available for developers to use. Some of the most popular ones are:</p><figure class="table"><table><thead><tr><th>Chain</th><th>Chain ID</th><th>Layer</th></tr></thead><tbody><tr><td>Ethereum: Goerli</td><td>5</td><td>L1</td></tr><tr><td>Ethereum: Sepolia</td><td>11155111</td><td>L1</td></tr><tr><td>BNB Smart Chain: TestNet</td><td>97</td><td>L1</td></tr><tr><td>Avalanche: Fuji</td><td>43113</td><td>L1</td></tr><tr><td>Polygon PoS: Mumbai</td><td>80001</td><td>L2</td></tr><tr><td>Polygon zkEVM: Goerli</td><td>1442</td><td>L2</td></tr><tr><td>Optimism: Goerli</td><td>420</td><td>L2</td></tr><tr><td>Arbitrum: Goerli</td><td>421613</td><td>L2</td></tr><tr><td>Base: Goerli</td><td>84531</td><td>L2</td></tr></tbody></table></figure><h2>Benefits of public Testnets</h2><ul><li><strong>Safe experimentation:</strong>&nbsp;Test smart contracts and dApps without risking real Ether, protecting your wallet and precious reputation.</li><li><strong>Rapid iteration:</strong>&nbsp;Quickly deploy and test new features, identifying bugs and optimizing code before hitting the Mainnet.</li><li><strong>Stress testing:</strong>&nbsp;Simulate high traffic and malicious attacks, ensuring your dApp can handle the heat of real-world usage.</li><li><strong>Community collaboration:</strong>&nbsp;Public Testnets foster collaboration with fellow developers, sharing knowledge and building better tools together.</li></ul><h2>Limitations of public Testnets.</h2><ul><li><strong>Contract Confidentiality:</strong>&nbsp;Public Testnets lack privacy, potentially exposing sensitive contract information.</li><li><strong>Transaction Confirmation:</strong>&nbsp;Transaction processing on public Testnets can be slow, leading to delays during development.</li><li><strong>Token Accumulation:</strong>&nbsp;Gathering enough Testnet tokens for comprehensive testing can be time-consuming.</li><li><strong>Mainnet Testing:</strong>&nbsp;Setting up existing protocols deployed on the mainnet for testing can be cumbersome and time-intensive.</li></ul><h2>Choose&nbsp;<a href="https://www.buildbear.io/">BuildBear</a>&nbsp;to10x your Dapp Development, and here’s why:</h2><ul><li><strong>Mainnet State</strong>: BuildBear enables&nbsp;<strong>forking</strong>&nbsp;of the&nbsp;<strong>Mainnets</strong>&nbsp;and Testnet spin-up within seconds. This capability streamlines&nbsp;<strong>testing</strong>&nbsp;alongside&nbsp;<strong>Mainnet protocols</strong>, eliminating the need for mock environments.</li><li><strong>BuildBear Faucet:</strong>&nbsp;Gain immediate access to&nbsp;<strong>native</strong>&nbsp;and popular&nbsp;<strong>ERC20</strong>&nbsp;Testnet&nbsp;<strong>tokens</strong>&nbsp;through the BuildBear&nbsp;<strong>Faucet</strong>. Say goodbye to manual token accumulation and enjoy significant time savings.</li><li><strong>Transaction Speed:</strong>&nbsp;Experience transaction processing that’s&nbsp;<strong>4 times</strong>&nbsp;<strong>faster</strong>&nbsp;than&nbsp;<strong>public Testnets</strong>. This dramatic reduction in contract test script runtime speeds up iterations.</li><li><strong>Private Testnets:</strong>&nbsp;With BuildBear, all&nbsp;<strong>contract</strong>&nbsp;and&nbsp;<strong>transaction data</strong>&nbsp;remains&nbsp;<strong>private</strong>, accessible only to authorized individuals, ensuring confidentiality.</li><li><strong>Advanced Testing:</strong>&nbsp;The BuildBear Testnet empowers you to&nbsp;<strong>manipulate time</strong>,&nbsp;<strong>capture snapshots</strong>, adjust&nbsp;<strong>Chainlink</strong>&nbsp;token prices, and&nbsp;<strong>impersonate</strong>&nbsp;other accounts for&nbsp;<strong>testing abnormal scenarios</strong>. These capabilities aren’t possible on public testnets.</li></ul><blockquote><p>What are you waiting for? Utilize&nbsp;BuildBear&nbsp;to accelerate your development process.</p><p><i><strong>Spend your valuable time building your product while we take care of the rest.</strong></i></p></blockquote><p>Author: <a href="https://twitter.com/chandan1_">chandan</a></p>

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Testnets are alternative blockchain networks that replicate the functionalities of the Mainnet (live blockchain) but operate with test Ether or other tokens that hold no real-world value...

A Comprehensive Guide on Public Testnets

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A Comprehensive Guide on Public Testnets

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Test DApps at Scale.