I don't know smart contracts well enough, but this is probably a simple question for someone who does:

can you make a contract that only allows an address to mint one NFT? i.e. I couldn't buy seven farcats, the contract would stop me at one

bringing onchain communities together • events.xyz (@event)

You mean limit one mint per address? That’s pretty common I think (unless I’m misunderstanding)

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Yeah limiting to one per human is much harder

Yeah the issue is Sibyl attacks with a naive implementation

Most creation contracts support this I think (Zora, highlight, etc.). 

Limiting to one per human, instead of one per address, is much harder