https://blog.emn178.cc/en/ A blog sharing experiences about programming and technology. Tue, 28 Nov 2023 07:24:28 GMT http://hexo.io/ https://blog.emn178.cc/en/post/using-ethers-js-to-sign-eip-712-typed-structured-data/ https://blog.emn178.cc/en/post/using-ethers-js-to-sign-eip-712-typed-structured-data/ Sat, 14 Oct 2023 02:17:23 GMT <p><a href="/en/post/solidity-eip-712-typed-structured-data-hashing-and-signing/">Solidity - EIP-712 Typed Structured Data Hashing and Signi Blockchain https://blog.emn178.cc/en/post/using-ethers-js-to-sign-eip-712-typed-structured-data/#disqus_thread https://blog.emn178.cc/en/post/using-web3-js-to-sign-and-recover-eip-712-typed-structured-data/ https://blog.emn178.cc/en/post/using-web3-js-to-sign-and-recover-eip-712-typed-structured-data/ Fri, 13 Oct 2023 11:50:47 GMT <p><a href="/en/post/solidity-eip-712-typed-structured-data-hashing-and-signing/">Solidity - EIP-712 Typed Structured Data Hashing and Signi Blockchain https://blog.emn178.cc/en/post/using-web3-js-to-sign-and-recover-eip-712-typed-structured-data/#disqus_thread https://blog.emn178.cc/en/post/solidity-eip-712-typed-structured-data-hashing-and-signing/ https://blog.emn178.cc/en/post/solidity-eip-712-typed-structured-data-hashing-and-signing/ Thu, 12 Oct 2023 12:39:22 GMT <p>This article explains the <a href="https://eips.ethereum.org/EIPS/eip-712">EIP-712</a> standard and how to use Solidity to implement EIP- Blockchain Solidity https://blog.emn178.cc/en/post/solidity-eip-712-typed-structured-data-hashing-and-signing/#disqus_thread https://blog.emn178.cc/en/post/using-ethers-js-to-sign-and-recover/ https://blog.emn178.cc/en/post/using-ethers-js-to-sign-and-recover/ Wed, 11 Oct 2023 11:59:57 GMT <p><a href="/en/post/solidity-ecrecover/">Solidity - ecrecover</a> this article explains how smart contracts verify signatures. This article Blockchain https://blog.emn178.cc/en/post/using-ethers-js-to-sign-and-recover/#disqus_thread https://blog.emn178.cc/en/post/using-web3-js-to-sign-and-recover/ https://blog.emn178.cc/en/post/using-web3-js-to-sign-and-recover/ Tue, 10 Oct 2023 01:03:27 GMT <p><a href="/en/post/solidity-ecrecover/">Solidity - ecrecover</a> this article explains how smart contracts verify signatures. This article Blockchain https://blog.emn178.cc/en/post/using-web3-js-to-sign-and-recover/#disqus_thread https://blog.emn178.cc/en/post/solidity-signature-malleability/ https://blog.emn178.cc/en/post/solidity-signature-malleability/ Mon, 09 Oct 2023 02:21:28 GMT <p>The previous article introduced the usage of <a href="/en/post/solidity-ecrecover/">ecrecover</a>, but the built-in ecrecover has a signa Blockchain Solidity https://blog.emn178.cc/en/post/solidity-signature-malleability/#disqus_thread https://blog.emn178.cc/en/post/solidity-ecrecover/ https://blog.emn178.cc/en/post/solidity-ecrecover/ Sun, 08 Oct 2023 06:47:24 GMT <h2 id="Introduction"><a href="#Introduction" class="headerlink" title="Introduction"></a>Introduction</h2><p>The <code>ecrecover</code> fun Blockchain Solidity https://blog.emn178.cc/en/post/solidity-ecrecover/#disqus_thread https://blog.emn178.cc/en/post/zkevm-airdrop-guide/ https://blog.emn178.cc/en/post/zkevm-airdrop-guide/ Sun, 30 Jul 2023 10:06:32 GMT <p><a href="https://polygon.technology/polygon-zkevm">zkEVM</a> is one of the L2 solutions of ZK Rollup. While there is already a MATIC coin Blockchain https://blog.emn178.cc/en/post/zkevm-airdrop-guide/#disqus_thread https://blog.emn178.cc/en/post/load-css-asynchronously/ https://blog.emn178.cc/en/post/load-css-asynchronously/ Fri, 28 Jul 2023 14:20:34 GMT <p>This article explains FOUC (Flash of unstyled content), render-blocking issues, and how to load CSS asynchronously.</p> <h2 id="Flash-of- Programming https://blog.emn178.cc/en/post/load-css-asynchronously/#disqus_thread https://blog.emn178.cc/en/post/gcp-cloud-monitoring-reduce-data-and-cost/ https://blog.emn178.cc/en/post/gcp-cloud-monitoring-reduce-data-and-cost/ Thu, 27 Jul 2023 15:12:03 GMT <p>Cloud Monitoring can be used to monitor system status and send alert notifications. I mainly use to monitor hard disk capacity and some c DevOps https://blog.emn178.cc/en/post/gcp-cloud-monitoring-reduce-data-and-cost/#disqus_thread https://blog.emn178.cc/en/post/using-web3-js-to-parse-custom-error/ https://blog.emn178.cc/en/post/using-web3-js-to-parse-custom-error/ Tue, 20 Jun 2023 13:43:40 GMT <p>The previous article <a href="/en/post/solidity-custom-error/">Solidity - Custom Error</a> mentioned how to use custom error in smart con Blockchain https://blog.emn178.cc/en/post/using-web3-js-to-parse-custom-error/#disqus_thread https://blog.emn178.cc/en/post/ethers-js-parse-custom-error/ https://blog.emn178.cc/en/post/ethers-js-parse-custom-error/ Mon, 19 Jun 2023 15:21:18 GMT <p>The previous article <a href="/en/post/solidity-custom-error/">Solidity - Custom Error</a> mentioned how to use custom error in smart con Blockchain https://blog.emn178.cc/en/post/ethers-js-parse-custom-error/#disqus_thread https://blog.emn178.cc/en/post/solidity-custom-error/ https://blog.emn178.cc/en/post/solidity-custom-error/ Sun, 18 Jun 2023 15:20:31 GMT <p>This article introduces the usage of custom error in Solidity, including ways to define errors, usage, and error handling.</p> <h2 id="Us Blockchain Solidity https://blog.emn178.cc/en/post/solidity-custom-error/#disqus_thread https://blog.emn178.cc/en/post/scam-token-check-tools-token-sniffer-and-goplus/ https://blog.emn178.cc/en/post/scam-token-check-tools-token-sniffer-and-goplus/ Sat, 10 Jun 2023 12:33:37 GMT <p>There are many methods of blockchain fraud, one of which is to airdrop or sell fraudulent tokens, and manipulate the contract to obtain b Blockchain https://blog.emn178.cc/en/post/scam-token-check-tools-token-sniffer-and-goplus/#disqus_thread https://blog.emn178.cc/en/post/layerzero-airdrop-guide/ https://blog.emn178.cc/en/post/layerzero-airdrop-guide/ Fri, 09 Jun 2023 14:32:17 GMT <p><a href="https://layerzero.network/">LayerZero</a> is a cross-chain solution, and it is also a possible airdrop project that everyone has Blockchain https://blog.emn178.cc/en/post/layerzero-airdrop-guide/#disqus_thread https://blog.emn178.cc/en/post/linea-airdrop-guide/ https://blog.emn178.cc/en/post/linea-airdrop-guide/ Tue, 06 Jun 2023 15:11:26 GMT <p><a href="https://linea.build/">Linea</a> is one of the L2 solutions of ZK Rollup. The company behind it is Consensys, which is also the d Blockchain https://blog.emn178.cc/en/post/linea-airdrop-guide/#disqus_thread https://blog.emn178.cc/en/post/awesome-crypto-world-acw-scam-token/ https://blog.emn178.cc/en/post/awesome-crypto-world-acw-scam-token/ Mon, 05 Jun 2023 15:00:11 GMT <p>There have been a lot of airdropped fraudulent tokens recently, this time I saw <a href="https://bscscan.com/token/0x82d0952f3524df3e0f00 Blockchain https://blog.emn178.cc/en/post/awesome-crypto-world-acw-scam-token/#disqus_thread https://blog.emn178.cc/en/post/starknet-airdrop-guide/ https://blog.emn178.cc/en/post/starknet-airdrop-guide/ Sun, 02 Apr 2023 12:09:49 GMT <p><a href="https://www.starknet.io/">StarkNet</a> is one of the L2 solutions of ZK Rollup, which is also a popular airdrop opportunity. Her Blockchain https://blog.emn178.cc/en/post/starknet-airdrop-guide/#disqus_thread https://blog.emn178.cc/en/post/ai-a-scam-token/ https://blog.emn178.cc/en/post/ai-a-scam-token/ Sat, 01 Apr 2023 12:21:32 GMT <p>I accidentally saw a transfer on Debank, 23000 <a href="https://bscscan.com/address/0xd048b4c23af828e5be412505a51a8dd7b37782dd">AI-A (AI Blockchain https://blog.emn178.cc/en/post/ai-a-scam-token/#disqus_thread https://blog.emn178.cc/en/post/zksync-airdrop-step-by-step/ https://blog.emn178.cc/en/post/zksync-airdrop-step-by-step/ Thu, 30 Mar 2023 14:14:18 GMT <p>This article illustrates, through visuals and text, how to bridge and how to interact with applications. After understanding the strategy Blockchain zkSync https://blog.emn178.cc/en/post/zksync-airdrop-step-by-step/#disqus_thread https://blog.emn178.cc/en/post/zksync-airdrop-strategy/ https://blog.emn178.cc/en/post/zksync-airdrop-strategy/ Sun, 26 Mar 2023 14:43:07 GMT <p>Arbitrum has been airdropped a while ago, and I heard that some people have retired by airdrop. <a href="https://zksync.io/">zkSync</a> i Blockchain zkSync https://blog.emn178.cc/en/post/zksync-airdrop-strategy/#disqus_thread https://blog.emn178.cc/en/post/solidity-gas-optimization-variable-ordering/ https://blog.emn178.cc/en/post/solidity-gas-optimization-variable-ordering/ Tue, 11 Sep 2018 02:26:38 GMT This article explains the gas optimization techniques of Solidity smart contracts, explains how variable ordering affect gas consumption, and provides two optimization strategies to reduce gas consumption. Blockchain Solidity https://blog.emn178.cc/en/post/solidity-gas-optimization-variable-ordering/#disqus_thread https://blog.emn178.cc/en/post/solidity-gas-optimization-data-compression/ https://blog.emn178.cc/en/post/solidity-gas-optimization-data-compression/ Mon, 07 May 2018 10:26:05 GMT This article explains the gas optimization techniques of Solidity smart contracts. Explain how to use data merging and numbering to compress data to reduce variables and gas consumption. Blockchain Solidity https://blog.emn178.cc/en/post/solidity-gas-optimization-data-compression/#disqus_thread https://blog.emn178.cc/en/post/solidity-gas-optimization-function-name/ https://blog.emn178.cc/en/post/solidity-gas-optimization-function-name/ Fri, 04 May 2018 09:04:52 GMT This article explains the gas optimization techniques of Solidity smart contracts. The article will explain the rules and principles of function names on gas consumption, explain the definition and generation of function signatures and Method IDs, and finally provide optimization methods. Programming Solidity https://blog.emn178.cc/en/post/solidity-gas-optimization-function-name/#disqus_thread https://blog.emn178.cc/en/post/solidity-gas-optimization/ https://blog.emn178.cc/en/post/solidity-gas-optimization/ Wed, 07 Mar 2018 09:02:40 GMT This article explains the gas optimization techniques of Solidity smart contracts. This article will organize and analyze some factors that affect gas consumption in smart contracts, which will help us understand which instructions consume the most and use them cautiously. Blockchain Solidity https://blog.emn178.cc/en/post/solidity-gas-optimization/#disqus_thread https://blog.emn178.cc/en/post/how-to-measure-javascript-code-coverage-with-jscoverage/ https://blog.emn178.cc/en/post/how-to-measure-javascript-code-coverage-with-jscoverage/ Fri, 30 Oct 2015 09:34:00 GMT <p>We had known <a href="/en/post/how-to-write-a-library-for-node-js-and-browser-with-mocha-unit-tests/">How to Write a Library for Node.js Programming Node.js JavaScript https://blog.emn178.cc/en/post/how-to-measure-javascript-code-coverage-with-jscoverage/#disqus_thread https://blog.emn178.cc/en/post/how-to-write-a-library-for-node-js-and-browser-with-mocha-unit-tests/ https://blog.emn178.cc/en/post/how-to-write-a-library-for-node-js-and-browser-with-mocha-unit-tests/ Wed, 28 Oct 2015 09:20:00 GMT <p><a href="http://mochajs.org/">Mocha</a> is a test framework for JavaScript, it provides Node.js and browser versions. Assume we implement Programming Node.js JavaScript https://blog.emn178.cc/en/post/how-to-write-a-library-for-node-js-and-browser-with-mocha-unit-tests/#disqus_thread https://blog.emn178.cc/en/post/node-js-how-to-integrate-travis-ci-with-github/ https://blog.emn178.cc/en/post/node-js-how-to-integrate-travis-ci-with-github/ Wed, 28 Oct 2015 07:50:00 GMT <p><a href="https://travis-ci.com/">Travis CI</a> is service for Continuous Integration and it is easy to integrate with the projects on Git Programming Node.js JavaScript https://blog.emn178.cc/en/post/node-js-how-to-integrate-travis-ci-with-github/#disqus_thread https://blog.emn178.cc/en/post/how-to-omit-bundle-exec-prefix-by-bundle-binstubs/ https://blog.emn178.cc/en/post/how-to-omit-bundle-exec-prefix-by-bundle-binstubs/ Wed, 28 Oct 2015 06:00:00 GMT <h2 id="bundle-binstubs"><a href="#bundle-binstubs" class="headerlink" title="bundle binstubs"></a>bundle binstubs</h2><p>In Ruby, we use Bu Programming Ruby https://blog.emn178.cc/en/post/how-to-omit-bundle-exec-prefix-by-bundle-binstubs/#disqus_thread