What is Fuzzing? Fuzz testing (or fuzzing) is an automated software testing method with the goal to find vulnerabilities, security issues, and defects of the application. The idea is to inject invalid, malformed, or unexpected inputs into the application using a fuzzing tool and observing how the system reacts to those inputs (e.g., exceptions, leakage … Read more
In this guide, I’ve compiled the top 7 freelancing niches I found highly profitable based on my experience working as a business owner and freelancer myself, hiring hundreds of freelance developers for my company, and teaching thousands of freelancing students through our books and courses. Each niche is presented with a video where I show … Read more
This post is part of our Smart Contract Security Series: Ownership Exploit Private Variable Exploit Reentrancy Attack tx.origin Phishing Attack Denial of Service Attack The post discusses the Denial of Service or alias the DoS attack. The Denial of Service (hence referred to as DoS) restricts legitimate users from using the smart contracts permanently or … Read more
This post is part of our Smart Contract Security Series: Ownership Exploit Private Variable Exploit Reentrancy Attack tx.origin Phishing Attack Denial of Service Attack In this post, we discuss phishing attacks due to tx.origin. In the regular phishing of a website, phishing begins with a phony email or another kind of communication intended to entice … Read more
You can check out the code for this article on our GitHub. Preamble This post is in continuation of our Smart Contract Security Series. This post is part of our Smart Contract Security Series: Ownership Exploit Private Variable Exploit Reentrancy Attack tx.origin Phishing Attack Denial of Service Attack The post discusses the next attack called … Read more
If you are considering investing time in learning about blockchain, it can seem a weighty undertaking. There are a multitude of blockchain variants such as Bitcoin, Ethereum, Litecoin, and Dogecoin, and the terminology can be just as confusing. Four general types of blockchain networks are in use today: public, private, consortium, and permissioned. Each has … Read more
Introduction This post is part of our Smart Contract Security Series: Ownership Exploit Private Variable Exploit Reentrancy Attack tx.origin Phishing Attack Denial of Service Attack In this part 2 of the series, we’ll examine how to exploit the “private” vulnerability in Solidity. As the name suggests, private means not accessible to anyone outside. Can we … Read more
In the smart contract security series, we will see multiple vulnerabilities, attacks, and exploitations in the smart contracts, along with the prevention measures. This post is part of our Smart Contract Security Series: Ownership Exploit Private Variable Exploit Reentrancy Attack tx.origin Phishing Attack Denial of Service Attack Unlike mobile and web development, in which software … Read more
This tutorial shows you how to implement your own prototype of an NFT marketplace with Solidity and JavaScript. You can check out the code on our GitHub: GitHub: https://github.com/finxter/NFTMarketplace For additional help, you can find a full course with explainer videos on the Finxter Computer Science Academy: Video Course: Creating an NFT Marketplace with Solidity … Read more
This article will look at deploying a smart contract to Polygon using Brownie. What is Polygon? Polygon is “a protocol and a framework for building and connecting Ethereum-compatible blockchain networks” (https://polygon.technology/). It started as Matic Network in 2017 to solve Ethereum’s scalability and user experience issues by using an off/side chain scaling solution. In 2021, … Read more
An array is a data structure where multiple values of similar data types can be stored. In contrast, a struct works as a container of a group of elements of different data types. A struct can then also be considered as a new data type. Hence we can create an array of structs comprising those … Read more
What is an ERC-721 Token? An ERC-721 token is a smart contract on Ethereum that implements the methods and events specified in the EIP-721: Non-Fungible Token Standard. It is designed to be used as a non-fungible token (NFT), meaning the token’s instances (or units) are distinct from one another. The ERC-721 standard is based on … Read more