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Articles tagged with #ethereum
How Reentrancy Attacks Work in Solidity — and How to Prevent Them Your contract is probably vulnerable right now, and you don't even know it. The Part Nobody Tells You Reentrancy isn't some exotic attack that only happens to bad code. It's baked int...
Merkle Trees in Blockchain: From Bitcoin to Airdrops If you've ever debugged a database query, you've felt the pain of verifying data at scale. You run a SELECT query, get back 10,000 rows, and think: "How do I know this is complete and unchanged?" ...
Flash Loans: How Aave Turned Instant Liquidity Into a $25M Problem February 2020. bZx protocol got torn apart by a $55,000 flash loan attack—pocket change now, but it was the first time anyone weaponized atomic arbitrage on mainnet.[^1] Three years ...
ERC-20 vs ERC-721 vs ERC-1155: When to Use Each Token Standard Most projects pick a standard and never think about it again. That's how you end up with an NFT collection that costs $200 per mint because you chose ERC-721 instead of ERC-1155. The Par...
Signature Replay Attacks in Solidity: Why Your Metatransactions Are Vulnerable by Default If you've ever built a REST API in Java or Go, you know about idempotency keys. You append a unique identifier to a request so that if a client accidentally se...
Reading a Smart Contract Is Just Reading Source Code—Why Are You Intimidated? When I first moved from backend development to Web3, someone asked me to "audit" a DeFi protocol. I panicked. I'd never seen a smart contract. But then I realized: I'd bee...
