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Last active November 14, 2022 08:19
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Learn Upgradable Smart Contracts.md

Upgradable contracts - UUPS (better than Transparent Proxy)

Source: Official Openzeppelin youtube channel

All resources related to Upgradability from Openzeppelin: Click here

Depending on where we put the upgradeTo() function we decide b/w two types of upgradable smart contracts.

image

UUPS is newer than Transparent proxy.

Costs comparison of deployment and usage:

image

Upgrading contract with wrong order of variables compared to the older version of deployed contract throws error as we can see below:

This is becoz of the way solidity allocates the storage locaitons in a linear manner:

image

More sources:

image

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