In this article, we’ll learn about checked and unchecked expressions and when to use each of them. It’s part of our long-standing tradition to make this (and other) articles a faithful companion or a supplement to the official Solidity documentation for this article’s topic. We should consider whether an expression should be checked or unchecked … Read more
Bitcoin, a decentralized digital currency, uses a unique scripting system in its transactions to provide greater flexibility and security. One of the important script opcodes in this system is the OP_RETURN, which has provided an avenue for embedding data within the Bitcoin blockchain. 👇💡 The OP_RETURN is a script opcode that marks a transaction output … Read more
The exponential adoption of blockchain technology and smart contracts forces us to find new solutions to emerging scalability and efficiency challenges. One solution that has attracted attention in the Ethereum ecosystem is the zkEVM Rollup, a zero-knowledge (ZK) rollup designed to enhance the performance and security of smart contracts. Zero-knowledge rollup, or ZK-Rollup, is a … Read more
Once upon a time, I was a distributed systems researcher specializing in graph partitioning algorithms. Those were thrilling days, though I must admit I didn’t enjoy the daily commute and the time away from my family. During that period, I delved deep into classic distributed systems conundrums like the Byzantine Generals Problem. When I discovered … Read more
Overview 🏰 Picture a mighty city, surrounded by a bunch of Byzantine generals 💂♂️, trying to unite and plan an epic attack! But oh no! 😱 Some of these generals might be traitors 🕵️, who’ll backstab the others and ruin the plan. They need a foolproof way to agree on a battle strategy while handling … Read more
As promised in the previous article, we’ll get more closely familiar with the concept of scoping next. We’ll explain what scoping is, why it exists, and how it helps us in programming. It’s part of our long-standing tradition to make this (and other) articles a faithful companion, or a supplement to the official Solidity documentation. … Read more
In this article, we’ll learn more about variable declarations in Solidity and further explain some of their specific behavior. To keep the article more succinct, we’ll focus on the next subject, scoping, in the next article. It’s part of our long-standing tradition to make this (and other) articles a faithful companion or a supplement to … Read more
In the first part, we connected the front end with Metamask but couldn’t fetch the balance. Let’s try to fetch the balance from the wallet this time. But first, install the ether.js library to communicate with the smart contract. Import ether.js library to App.js. Now we need to import the contract ABI. 💡 The contract … Read more
Project Scenario In this 2-part series, I’ll show you how I built my own ERC-20 token like ETH in this project. I share this because you may want to do the same and learn from my experience. 👉 Recommended: How I Built My Own ERC-20 Token (2/2) I use Solidity to write a smart contract … Read more
Ethereum’s Total Value Locked (TVL) is $28,000,000,000 USD and Ethereum’s market cap is $193,000,000,000 USD. Based on my estimations below, there are at most 269,000 monthly active Solidity developers. Therefore, the Ethereum TVL per Solidity developer is more than $104,000, and the Ethereum market cap per Solidity developer is more than $717,000. So for all … Read more
We completed a transaction in the last part, but the transaction data had yet to be seen. In this part, we will drive the smart contract data to the user interface. The user’s data and the transaction time will be displayed on the user interface. This is part 4 of our four-tutorial series on creating … Read more
This is part 3 of our four-tutorial series on creating a decentralized web app to sell ebooks: 👇 We will connect the front end with the smart contract in this part of the series. The interaction with the smart contract will be done using ether.js. Move to the app.js file inside the source folder. We … Read more