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.

Nguồn: https://coinsbench.com/solving-damn-vulnerable-defi-v4-level-2-naive-receiver-c33d1a63cf21. 8sync News chỉ tóm tắt và dẫn link; bản quyền nội dung thuộc tác giả và nguồn gốc.

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Top 10 Polymarket Trading Strategies (With Examples)

A breakdown of 10 trading strategies for Polymarket, a decentralized prediction market platform. Strategies range from riskless arbitrage (binary complement, multi-outcome bundle, cross-platform) to momentum trading, term-structure spreads, correlation hedging, rules/settlement-edge trading, high-probability compounding, mention market bias exploitation, and whale copy-trading. Each strategy includes a concrete example. The guide also covers how to get started on Polymarket using a Web3 wallet and USDC, typical earnings potential (only ~16.8% of wallets are profitable), zero protocol fees, and seven key risks including smart contract exploits, regulatory enforcement, oracle failures, and liquidity crunches.

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