This is not my Smart Contract, but I wanted to open a discussion on it since it's pretty cool.
Those familiar with NFTs will know that a major pain point is randomizing the mint order. Without random mint order, it is very easy to figure out how to mint the rare NFTs within a collection.
This ERC721R contract developed by Roger Wu tries to solve this. It does so by using information about the block used to mint from the collection to mimic a random number generator. I've tried it a few times on testnet contracts and it works great.
I understand Chainlink can be used to generate random numbers but is very expensive from a gas perspective. Can anyone confirm?
Does Solidity really not have a random number generating function?
Are there any issues with the ERC721R structure regarding safety?