I’m working on a gaming project where players receive starter NFTs at no cost. Now I want to implement a system where minting additional game NFTs requires players to already own one of these starter tokens.
What’s the best approach to create this ownership dependency? Should I build the ownership verification directly into the smart contract, or handle it through external API validation before allowing the mint function to execute?
I’m looking for guidance on checking if a wallet holds specific tokens from a particular collection before permitting new mints. Any code examples would be really helpful since I’m still learning blockchain development.
Oh, and here’s another angle - what if people just borrow a starter NFT, mint, then immediately return it? I’ve seen this exploit hit other projects. You might want to add a timelock where wallets need to hold the starter for 24 hours before they can mint. Also heads up about flash loan attacks if you’re mixing in any ERC20 tokens.
For your gaming project, skip external APIs and verify ownership directly in the smart contract. The blockchain is your source of truth - use it. I’ve built similar mechanics before. Just use balanceOf to check if the caller owns at least one starter NFT before they can mint. Put this check right in your minting function - if starterCollection.balanceOf(msg.sender) returns zero, revert the transaction. Here’s something I learned the hard way: decide what happens when users transfer their starter tokens after minting. Do they keep access forever, or only while they own the starter? Also, those external contract calls cost gas, so work that into your tokenomics. Smart contract verification means no API failures or exploits can bypass your ownership rules.
This is really interesting! What’s your plan for the UX when someone tries to mint without a starter NFT? Error message or redirect them to grab a starter token first?
I’m worried about your starter distribution though. How do you stop bots from farming free starters just to bypass the restriction later? That feels like it could break your whole system.
Also - what if gas fees go crazy? People might skip minting even with starters if it’s too expensive. Maybe add a queue system or let them reserve mints when fees drop?
What kind of game mechanics are you building? Sounds like you’re creating a progression system - could be amazing if you nail it!