erc721a-extra-data-example

Background

I was curious about leveraging ERC721A’s extraData as a “storage hitchhiking” feature for token-related data. However, I couldn’t find any existing implementation of _setExtraData, so I decided to build one myself.

About

This repository demonstrates:

• Setting 3 bytes (uint24) of extra data in an external mint function
• Retrieving the extra data with a public getter function
• Preserving the extra data on transfers between non-zero addresses by overriding _extraData

For more details, check out the official ERC721A documentation to understand the underlying mechanism.

Usage

Test

$ forge test

Important Notes

It's just an example contract, do NOT blindly copy anything here into production code unless you really know what you are doing.