✅ Master Upgradeable Contracts
Understand proxies, storage safety, and secure upgrade governance
Learn upgradeable smart contract patterns
Your Progress
0 / 5 completed🎓 Module Complete
Congratulations! You've mastered smart contract upgradeability—a critical skill for production blockchain development.
📚 What You Learned
Delegatecall separates state (Proxy) from logic (implementations). Proxy stays fixed (users interact with same address), Logic is replaceable (upgrade code without losing state). The paradox solved: immutable addresses, upgradeable code.
Transparent: Simple, +2.5k gas (Compound/Aave). UUPS: Gas-efficient, +1k gas (Optimism). Beacon: Batch upgrades, +3k gas (token factories). Diamond: Modular, +4k gas (Aavegotchi). No "best" pattern—only right pattern for your constraints.
Variables map to slots (0, 1, 2...). Inserting in middle shifts slots, overwrites Proxy data. No errors—just corruption. Prevention mandatory: append-only layout, storage gaps (uint256[50] __gap), validation tools (OpenZeppelin Upgrades), documentation. One collision = bricked protocol (Parity $150M+, Audius $6M).
Admin control = power to drain funds. Single admin = fast but risky. Multisig = balanced (3-of-5). Timelock = community protection (48h exit window). DAO = full decentralization but slow. Best practice: multisig + timelock. Progression: start centralized (speed), mature to decentralized (trust minimization).
Billions in TVL use upgradeable contracts. OpenZeppelin Upgrades is industry standard. Compound/Aave use Transparent. Optimism uses UUPS. Token factories use Beacon. Gaming protocols use Diamond. Even disasters (Parity, Audius, Ronin, Nomad) teach critical lessons: audit storage, protect admin keys, test upgrades, use timelocks.
🧠 Test Your Knowledge
Take this 5-question quiz to verify you understand the core concepts. Test your knowledge of delegatecall, storage collisions, proxy patterns, and governance models.