Blockchain & Smart Contract Security — The Contract Staircase

A hands-on mid-level course that secures smart contracts and the applications built on them. Climb the contract staircase - eight steps: Model, Access, Arithmetic, Reentrancy, Oracles, Keys, Test, and Monitor - finding and fixing the flaws that drain funds, with real Solidity patterns and defensive checks. Strictly defensive. Four hands-on activities in every lesson.

What you'll learn

• Threat-model a smart contract and enforce correct access control.
• Prevent arithmetic, reentrancy, and logic bugs that lose funds.
• Secure oracles, keys, and external dependencies.
• Test, audit, and monitor contracts in production.

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