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In this video tutorial, Julian explains the need for upgrading smart contracts to fix security issues, change business logic, or add features. Smart contract code is usually immutable once deployed, but there are tricks to make it upgradeable. The first method he discusses is using a proxy smart contract that forwards function calls to the actual implementation. This method works on any EVM-compatible blockchain, including Ethereum, Binance Smart Chain, and Polygon. The fallback feature of Solidity allows functions to be processed even if they don't exist on the proxy contract.
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