Upgradeable Contracts

Deployed contract code cannot be changed. If you find a bug or need a new feature, the code is frozen at its address.

Upgradeable contracts work around this using a proxy pattern that lets you swap the logic while keeping the same address and data.

Upgradeability splits a contract into two parts:

• Proxy — holds the state and a pointer to the logic; users interact with it.
• Implementation — holds the code, no permanent state.

The proxy delegatecalls into the implementation, so logic runs against the proxy's storage.