Recent posts tagged smartcontracts

In 2016, an attacker discovered a bug in a smart contract called the DAO. He didn't need to compromise Ethereum. He didn't need a zero-day exploit. He found one bad assumption in the withdrawal logic, wrote a contract that exploited it recursively, ...

Most people signing a web development contract skim it, sign it, and never think about it again until something goes wrong, at which point the specific wording suddenly matters enormously. Here's a plain-language walkthrough of the terms that actuall...

We are building MilestoneCrowdfundUpgradeable: a smart contract that holds donor funds in escrow and releases them only when real-world milestones are verified. In our last post, we designed the engine for this protocol. We built a theoretical fortre...

When you first start writing smart contracts on the EVM chains, your journey usually begins in Remix. It is a powerful, open-source web and desktop application for writing, compiling, testing, and deploying code, making it a fantastic tool for quick ...

There is a beautiful, dangerous myth in the Web3 world: "Code is Law." The idea is that a smart contract is a perfect, impartial arbiter of a digital agreement. It executes with a logic as clean and precise as a set of micrometer calipers. But a cal...

En marzo de 2025, un error en un contrato de préstamos flash permitió a un atacante drenar 197 millones de dólares de un protocolo DeFi en menos de doce segundos. El contrato había pasado por una revisión interna, tenía cobertura de tests del 95 % y ...

A Blockchain revolution... If you are conversant with the web3 ecosystem, chances are that you would have interacted with a decentralized App dApp, you have a crypto wallet, own some tokens and have probably even made crypto transfers. All of the a...

When You Choose a Serious Mission — Everything Changes There is a moment in every founder’s journey when things stop being a hobby… and become a mission. Not a trend. Not hype. Not a fast-money experiment. A mission. When you truly decide to build so...

How to Verify a Smart Contract the Right Way A Real, Practical Guide Smart contract verification is not just a “nice to have” — it’s a core trust signal in crypto. Whether you’re building a DeFi project, a utility token, or experimenting with blockch...

> "Not all computers live in your house. Some live everywhere." — Allan Robinson Hey there, curious builder! If you’ve been following along on this journey from Chapter 1 to Chapter 4 of the Ethereum Book, congratulations! You’ve taken your firs...

Cryptography is one of the most important technologies behind Ethereum and other blockchains. Even though it sounds complicated, at its heart, it’s all about keeping things secure, proving ownership, and ensuring data can’t be faked or tampered with....

Opening the Door: Wallets & Addresses A wallet isn’t just where you “keep your crypto”—it’s your digital identity on Ethereum. Public Address = like your email where people send you ETH Private Key = your super-secret password to approve tran...

Private variables on EVM blockchains are not really private and hidden Do you think storing important keys and data in private key's are safer on EVM chains. Definition say's all, EVM is an transparent chain Attackers will always looks for deploye...

Storage layout and array overflow/underflow risks!!!! Solidity stores data in Each slot = 32 bytes 256 bits Each storage slot is numbered: slot 0, slot 1, slot 2 and so on. Solidity tries to pack variables into these slots efficiently, but the ac...

Blockchain Devops Blockchain DevOps involves the application of DevOps principles and practices in the blockchain ecosystem. It focuses on streamlining the development, deployment, testing, and operation of blockchain-based applications or network...