Ryuu - TechFi

The exploit on Optimism: What if you are too optimistic?

On June 5th, 20M OP token was stolen. This amount of OP was supposed to send to Wintermute by Optimism Foundation, however, Wintermute provided the address of their multisig on Ethereum, which they did not control on Optimism. Before that, Wintermute confirmed that they received two test transactions with 1OP

Security

What is Reentrancy Attack and How to Prevent it?

Ethereum smart contracts are programs deployed as decentralized applications running on the blockchain network. The smart contract is the foundation for many applications such as cryptocurrency, gaming, banking, e-commerce, etc. However, the evolution of smart contracts also comes with security vulnerability and exploit methods. One of the most common exploit

The symbol of Decentralized Autonomous Organization with a computer and a key

DeFi

Lines of code worth 60 million dollars in The DAO

What is The DAO?DAO (Decentralized Autonomous Organization) is an open-source project launched in April 2016 and aims to create a new business model for commercial and non-profit enterprises. The DAO works on the proposal of users who hold DAO tokens. They can stake Ether to receive DAO tokens and