Programming and Technology 2023-11-28T07:24:28.027Z https://blog.emn178.cc/en/ emn178 Hexo https://blog.emn178.cc/en/post/using-ethers-js-to-sign-eip-712-typed-structured-data/ 2023-10-14T02:17:23.000Z 2023-11-28T07:24:28.027Z

<p><a href="/en/post/solidity-eip-712-typed-structured-data-hashing-and-signing/">Solidity - EIP-712 Typed Structured Data Hashing and Signi

https://blog.emn178.cc/en/post/using-web3-js-to-sign-and-recover-eip-712-typed-structured-data/ 2023-10-13T11:50:47.000Z 2023-10-14T02:15:42.448Z

<p><a href="/en/post/solidity-eip-712-typed-structured-data-hashing-and-signing/">Solidity - EIP-712 Typed Structured Data Hashing and Signi

https://blog.emn178.cc/en/post/solidity-eip-712-typed-structured-data-hashing-and-signing/ 2023-10-12T12:39:22.000Z 2023-11-28T07:24:32.068Z

<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-

https://blog.emn178.cc/en/post/using-ethers-js-to-sign-and-recover/ 2023-10-11T11:59:57.000Z 2023-10-14T02:16:16.152Z

<p><a href="/en/post/solidity-ecrecover/">Solidity - ecrecover</a> this article explains how smart contracts verify signatures. This article

https://blog.emn178.cc/en/post/using-web3-js-to-sign-and-recover/ 2023-10-10T01:03:27.000Z 2023-11-28T07:24:40.733Z

<p><a href="/en/post/solidity-ecrecover/">Solidity - ecrecover</a> this article explains how smart contracts verify signatures. This article

https://blog.emn178.cc/en/post/solidity-signature-malleability/ 2023-10-09T02:21:28.000Z 2023-10-09T02:21:47.484Z

<p>The previous article introduced the usage of <a href="/en/post/solidity-ecrecover/">ecrecover</a>, but the built-in ecrecover has a signa

https://blog.emn178.cc/en/post/solidity-ecrecover/ 2023-10-08T06:47:24.000Z 2023-10-11T12:46:11.772Z

<h2 id="Introduction"><a href="#Introduction" class="headerlink" title="Introduction"></a>Introduction</h2><p>The <code>ecrecover</code> fun

https://blog.emn178.cc/en/post/zkevm-airdrop-guide/ 2023-07-30T10:06:32.000Z 2023-08-03T02:39:57.812Z

<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

https://blog.emn178.cc/en/post/load-css-asynchronously/ 2023-07-28T14:20:34.000Z 2023-07-28T14:20:12.076Z

<p>This article explains FOUC (Flash of unstyled content), render-blocking issues, and how to load CSS asynchronously.</p> <h2 id="Flash-of-

https://blog.emn178.cc/en/post/gcp-cloud-monitoring-reduce-data-and-cost/ 2023-07-27T15:12:03.000Z 2023-07-27T15:12:35.446Z

<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

https://blog.emn178.cc/en/post/using-web3-js-to-parse-custom-error/ 2023-06-20T13:43:40.000Z 2023-10-08T06:43:21.468Z

<p>The previous article <a href="/en/post/solidity-custom-error/">Solidity - Custom Error</a> mentioned how to use custom error in smart con

https://blog.emn178.cc/en/post/ethers-js-parse-custom-error/ 2023-06-19T15:21:18.000Z 2023-10-08T06:43:23.465Z

<p>The previous article <a href="/en/post/solidity-custom-error/">Solidity - Custom Error</a> mentioned how to use custom error in smart con

https://blog.emn178.cc/en/post/solidity-custom-error/ 2023-06-18T15:20:31.000Z 2023-10-08T06:43:29.764Z

<p>This article introduces the usage of custom error in Solidity, including ways to define errors, usage, and error handling.</p> <h2 id="Us

https://blog.emn178.cc/en/post/scam-token-check-tools-token-sniffer-and-goplus/ 2023-06-10T12:33:37.000Z 2023-06-10T12:33:31.906Z

<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

https://blog.emn178.cc/en/post/layerzero-airdrop-guide/ 2023-06-09T14:32:17.000Z 2023-06-18T07:50:49.773Z

<p><a href="https://layerzero.network/">LayerZero</a> is a cross-chain solution, and it is also a possible airdrop project that everyone has

https://blog.emn178.cc/en/post/linea-airdrop-guide/ 2023-06-06T15:11:26.000Z 2023-08-04T05:40:58.943Z

<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

https://blog.emn178.cc/en/post/awesome-crypto-world-acw-scam-token/ 2023-06-05T15:00:11.000Z 2023-10-08T06:44:18.768Z

<p>There have been a lot of airdropped fraudulent tokens recently, this time I saw <a href="https://bscscan.com/token/0x82d0952f3524df3e0f00

https://blog.emn178.cc/en/post/starknet-airdrop-guide/ 2023-04-02T12:09:49.000Z 2023-07-30T07:00:44.158Z

<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

https://blog.emn178.cc/en/post/ai-a-scam-token/ 2023-04-01T12:21:32.000Z 2023-10-08T06:44:18.768Z

<p>I accidentally saw a transfer on Debank, 23000 <a href="https://bscscan.com/address/0xd048b4c23af828e5be412505a51a8dd7b37782dd">AI-A (AI

https://blog.emn178.cc/en/post/zksync-airdrop-step-by-step/ 2023-03-30T14:14:18.000Z 2023-05-17T14:09:13.855Z

<p>This article illustrates, through visuals and text, how to bridge and how to interact with applications. After understanding the strategy

https://blog.emn178.cc/en/post/zksync-airdrop-strategy/ 2023-03-26T14:43:07.000Z 2023-10-08T06:44:18.768Z

<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

https://blog.emn178.cc/en/post/solidity-gas-optimization-variable-ordering/ 2018-09-11T02:26:38.000Z 2023-10-08T06:44:18.768Z

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.

https://blog.emn178.cc/en/post/solidity-gas-optimization-data-compression/ 2018-05-07T10:26:05.000Z 2023-10-08T06:44:18.768Z

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.

https://blog.emn178.cc/en/post/solidity-gas-optimization-function-name/ 2018-05-04T09:04:52.000Z 2023-10-08T06:44:18.768Z

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.

https://blog.emn178.cc/en/post/solidity-gas-optimization/ 2018-03-07T09:02:40.000Z 2023-10-08T06:44:18.768Z

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.

https://blog.emn178.cc/en/post/how-to-measure-javascript-code-coverage-with-jscoverage/ 2015-10-30T09:34:00.000Z 2023-11-07T08:14:09.984Z

<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

https://blog.emn178.cc/en/post/how-to-write-a-library-for-node-js-and-browser-with-mocha-unit-tests/ 2015-10-28T09:20:00.000Z 2023-11-07T08:13:22.614Z

<p><a href="http://mochajs.org/">Mocha</a> is a test framework for JavaScript, it provides Node.js and browser versions. Assume we implement

https://blog.emn178.cc/en/post/node-js-how-to-integrate-travis-ci-with-github/ 2015-10-28T07:50:00.000Z 2023-11-07T08:14:03.156Z

<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

https://blog.emn178.cc/en/post/how-to-omit-bundle-exec-prefix-by-bundle-binstubs/ 2015-10-28T06:00:00.000Z 2023-04-17T01:37:34.943Z

<h2 id="bundle-binstubs"><a href="#bundle-binstubs" class="headerlink" title="bundle binstubs"></a>bundle binstubs</h2><p>In Ruby, we use Bu