Special access to NFT holders

[Carlt]

Hi, I’m pretty new to Cardano so sorry for the noobish question.

I’m working on a NFT project that I want to release on Cardano. One of the main “selling points” of this project is that NFT holders will have special access to more content on our website.

How can I check if a person holds this NFT in their wallet?

[DinoDude]

First your app will need to ask users to export their wallet public key.

From here you have many ways to query holdings:

• Use Cardano Wallet Backend API Documentation
• Use GitHub - input-output-hk/cardano-db-sync: A component that follows the Cardano chain and stores blocks and transactions in PostgreSQL
• Use blockchain ledger directly (on-chain smart contract)
• Use third party explorer/scanner API (Blockfrost.io, etc)
• GitHub - input-output-hk/cardano-rosetta: An implementation of Rosetta for Cardano
• Etc, etc, etc

[Carlt]

Thanks for the reply

@DinoDude

First your app will need to ask users to export their wallet public key.

Could you point me in the right direction on how to do this part?

[DinoDude]

For users it varies by which wallet they are using but assuming you are making some kind of webapp integration on your end this usually can be achieved via QR code, web form, clipboard, etc. As with most development there is many solutions and it’s up to you to decide what is right for your use cases.

At the end of the day it’s effectively just a string that contains their public wallet id …