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How Does an Immutable Contract Prevent Malicious Changes by a Developer?

Once the contract is deployed, the original developer loses the administrative key to alter the code. The immutability ensures that the logic cannot be secretly changed to steal funds or introduce backdoors.

This separation of code deployment from ongoing control is a key security feature against developer-led "rug pulls."

How Can a Developer Restrict the Logic within a Fallback Function?
What Are the Technical Challenges of Creating Upgradeable Smart Contracts without Introducing Security Vulnerabilities?
Why Would a Developer Want a Mutable Smart Contract?
What Is the “Turing Completeness” of Smart Contracts?