Building a Real Smart Contract Web3 Marketplace on Ethereum Sepolia

A walkthrough of building a Web3 marketplace on Ethereum's Sepolia testnet using Solidity smart contracts, Hardhat, React/Vite, ethers.js, and MetaMask. The project implements on-chain payment splitting where 80% goes to the seller and 20% to the platform admin, all handled automatically by the smart contract without a centralized backend. Key concepts covered include MetaMask wallet authentication, gas fees, hybrid Web3 architecture (frontend stores product data, blockchain handles payments), and deploying contracts via Hardhat to Sepolia. The author also reflects on the insight that not all data belongs on-chain due to gas costs.

Nguồn: https://coinsbench.com/building-a-real-smart-contract-web3-marketplace-on-ethereum-sepolia-07b572a0f8a4. 8sync News chỉ tóm tắt và dẫn link; bản quyền nội dung thuộc tác giả và nguồn gốc.

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Solving Damn Vulnerable DeFi V4: Level 3- Truster

A walkthrough of Level 3 (Truster) from Damn Vulnerable DeFi V4, a smart contract security challenge. The pool contains an arbitrary external call vulnerability in its flash loan function. By borrowing 0 ETH and passing crafted calldata that calls ERC20 approve(), an attacker can grant themselves allowance over the pool's entire token balance, then drain it via transferFrom() after the flash loan completes. Key takeaways: never allow arbitrary external calls in flash loan logic, always control who can supply calldata, and flash loans themselves are not inherently dangerous — the surrounding logic is.

#smart-contracts#solidity#defi