An Introduction to Smart Contracts
summary
Overview of Ethereum smart contracts with a concrete Solidity bank example that stores balances, uses the payable keyword to accept funds, and exposes a withdraw that forgets to deduct balance before sending funds. Demonstrates the re-entrancy exploit that allowed the DAO loss (~$60 million) and shows the practical fix: call order matters — require checks and state updates must precede external transfers. Mentions alternatives to Solidity and ongoing safer-language efforts.
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chapters (9)
- 0:00Introduction and welcome
- 2:43What is blockchain
- 5:56Ethereum and smart contracts
- 10:15Smart contract basics
- 11:42Solidity introduction
- 16:45Security flaws in Solidity
- 21:50Reentrancy attack explained
- 22:34Future of smart contract languages
- 23:16Q&A and closing
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