Reentrancy attack is one of the most destructive attacks in Solidity smart contract. It occurs when a function makes an external call to another

The attacker can create a contract with a selfdestruct() function, send ether to it, call selfdestruct(target) and force ether to be sent to a target.

Overflow is a situation when uint reaches its byte size. Then the next element added will return the first variable element. This is only for <0.8 Solidity.

Contracts that use the tx.origin to authorize users are vulnerable to phishing attacks.

The world witnessed some of the massive DeFi hacks in 2021 on some of the most renowned protocols like bZx, Cheese Bank, Harvest Finance, Value Defi, etc.

A security issue in Solidity boils down to smart contracts not behaving the way they were intended to.

In level 3 you have to play a game: coin flip. To complete this level you'll need to guess the correct outcome of a coin flip 10 times in a row

As the popularity of smart contracts grows, so does the need for experts to identify potential security vulnerabilities.

In challenge 5 you are given 20 tokens to start with and you will beat the level if you somehow manage to get your hands on any additional tokens.

In general, I’ve found there to be 5 classes of Solidity exploits. Each exploit has a certain “code smell” associated with it.

In level 4 of the Ethernaut Game, our goal is to claim ownership of the Telephone contract.

This blog post describes the frontrunning vulnerability in Solidity smart contracts and how this can be prevented. Read on to find out more…

A new breed of testing techniques is emerging, ones that are both affordable and accessible, Fuzzing.

DeFi or decentralized finance is a growing sector in the blockchain and cryptocurrency space that defines an ecosystem of decentralized applications providing financial services with no governing authority.

This blog post describes the integer division error in Ethereum smart contracts and how this error can be prevented. Read on to know more…

Firms like CertiK, Consensys Diligence, Trail of Bits, Peckshield, and Slowmist provide a range of auditing services tailored to suit the varying requirements.

Claim ownership of the contract. Reduce the balance of the contract to 0.

Learn how to debug smart contracts with Solidity compiler. Discover tips and tricks, including logs, breakpoints, assertions, debugging tools, and testing.

Understand why EIP-4337 based concept of Account Abstraction, turning EOA-wallets into smart contract wallets won't add value and security to Institutions. .

Ethereum was launched in 2014 being the first blockchain with smart contracts. This changed the crypto industry forever. Let me explain why.

Read about the attack on Tornado Cash governance and understand it in the simplest form.

Here are the top 10 providers of smart contract auditing to consider in 2022.

My journey with Cyfrin Updraft has already taught me invaluable lessons about what it truly means to be a security researcher in the Web3 space.

How a rounding bug in Balancer V2’s Composable Stable Pools led to a $120M exploit—and why continuous audits are now a DeFi must.

Empirical analysis of LLMs, TAPs, and smart contracts shows 100% execution under formal triggers.

Blockchain technology and smart contracts are significant innovations with huge potential, but, the technology is only as secure as the code written for it.

Unlock the secrets of Honeypot attacks in smart contracts and learn how attackers exploit interface vulnerabilities.

Smart Contracts are immutable, meaning they can not be changed after deployment. A free vulnerability is essential before deployment into blockchain networks.

Delve into the world of smart contract vulnerabilities as we unravel delegatecall attacks—a persistent threat to blockchain security.

Writing secure smart contracts is hard. In this article I'll look at 22 security tools from across web3 available at each stage of smart contract development.

Contract lifecycle management (CLM) is a software-defined, cloud-based project and regulatory management solution to manage contracts. Read on.

Most people think that blockchain is completely safe and particularly difficult to hack. Let’s find out about blockchain security issues and how to fight them.

The HackerNoon podcast on Smart Contract Interoperability, Ethereum, & Crypto with Maciej Baj, t3rn CTO, hosted by Utsav Jaisval.

Nearly half of the largest DeFi breaches trace back to smart contract flaws. Research indicates that up to 89% of smart contracts contain vulnerabilities.

This is the second part of my series around Ethernaut Game. In this post, we will deal with Level 2: Fallout.

Perplexed about how to perform an audit for your smart contracts? This comprehensive guide will make the task easier for you! Read more.

Timelock contracts can reduce the risk of attacks on private wallets by providing a delayed transaction feature.

Exploring risks in Solidity transfers: Gas griefing, return data handling & mitigations in smart contracts using Yul, Vyper, and EVM.

Explore how DDoS attacks threaten DeFi platforms, their devastating impact on protocols and users, and the advanced cybersecurity solutions.

This is the first in a planned multi-part series in which I'll write about security topics in blockchain development from a few different angles.

Flow is a permissionless layer-1 blockchain built to support the high-scale use cases of games, virtual worlds, and the digital assets that power them.

11/13/2025: Top 5 stories on the HackerNoon homepage!

As storing information on the blockchain becomes more popular, the availability of smart contracts becomes more widespread. They behave according to established parameters, automatically letting events happen once specified conditions are met.

Explore the strategic partnership between Hypernative and Flare aimed at bolstering the security of the Web3 ecosystem.

The April selection of the latest news, tools and materials from the world of Solidity.

Smart contracts operate on a ‘if-then-else’ logic that does not inherently work in lockstep with the natural language of legal contracts.

An auditor’s goal is to find as many vulnerabilities as possible and educate the client on ways to improve the security of their codebase moving forward.

In blockchain development, smart contracts may encounter serious vulnerabilities, especially when there’s a loop that iterates over data provided by users.

In this article, I will demonstrate an example of a Re-Entrancy vulnerability and three different methods to prevent Re-Entrancy attacks.

Understanding Ethereum smart contract storage: Unveiling vulnerabilities in data security & strategies for protection. 🛡️🔒📊

VC funding doesn’t guarantee security. Explore how 5 well-funded blockchain projects failed due to vulnerabilities and why audits are crucial for Web3 safety.

Explore the transformative power of smart contracts in revolutionizing business transactions across industries.

It takes one look at the crypto market to see how unsafe smart contracts can be.

One of the most important indicators that your smart contract auditor is reliable, diligent, effective and honest is their reputation.

Explore the critical role of smart contract audits in ensuring security, mitigating risks, and navigating complexities in Web3 agreements.

TokenGuide employs a sophisticated analysis approach that combines AI with heuristic methods to scrutinize smart contracts and assess token liquidity.

Learn how to use AI for smart contract audits the right way. Avoid costly mistakes with structured prompts, verification steps, and real exploit validation.