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
Today I gave a service consultant access to one of my AWS servers. I have a few files on the server that I was reluctant to share with the service consultant because these files contain sensitive personal data. Python is my default way to solve these types of problems. Naturally, I wondered how to encrypt … Read more
🛑 Disclaimer: NOT INVESTMENT ADVICE! In this short project, I’ll explain a Python trading bot I used for the purpose of arbitrage trading. I use Bitcoin BTC, but the arbitrage bot works better on illiquid and inefficiently priced coins — Bitcoin is usually far too liquid and efficiently priced for this to work. I also … 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
Solana, one of the blockchains that offer an incredibly low transaction fee, is well known for its speed and efficiency. Compared to Ethereum‘s 15 transactions per second, Solana’s network can handle about 3,400 transactions per second. 🛑 Attention: There is no free lunch — Solana sacrifices decentralization to accomplish this speed. Still — many freelancing … Read more
In this article, we’ll take a closer look at how contracts are created, both directly, i.e. while being implicitly deployed on the blockchain, and indirectly, i.e. when their creation is triggered by another contract. It’s part of our long-standing tradition to make this (and other) articles a faithful companion, or a supplement to the official … Read more
In this article, we’ll entertain ourselves by learning about an interesting topic: positional and named function calls in Solidity. It’s part of our long-standing tradition to make this (and other) articles a faithful companion and supplement to the official Solidity documentation. Function Parameters and Arguments So far, we’ve learned about internal and external function calls, … Read more
Continuing on the previous article concerning address member types and type information, we’ll learn about 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. Members of bytes and string Two practical member functions are available for concatenating a variable number of … Read more
Continuing on the previous article concerning units and globally available variables, we’ll learn about members of address types and type information. 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. ▶️ Play: Feel free to watch our article explainer video while … Read more
With this article, we’re opening a new area of our study, that of units and globally available variables in Solidity. To begin with, we’ll learn about ether units and time units. After that, we’ll start with a block of subsections on special variables and functions, stretching through this and the next two articles. It’s part … Read more
In this article, we’ll entertain ourselves with conversions between elementary types in Solidity. We’ll mention implicit and explicit conversions, as well as conversions between literals. 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. Implicit Conversions The … Read more