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The Invite link contains your referral information. Anyone minting a node using your invite link will comes under your block.
When someone enters the website using an invite link, your referral code will be stored in their browser cookie for the next 6 months. So when even the user comes back to the rind and starts a node in 6 months, he/she will be added to your blocks. (unless they don't use another invite link)
You can use any of your NFT ids in your invite link. When minting, the system checks all the nodes a wallet owns and adds the new user under the respective nodes in your wallet.