Chainpin is a service that allows you to receive NFTs by scanning a QR code at a specific location. Businesses can pre-set NFTs into the QR code and place it at designated locations. Users can then receive the NFT simply by scanning this QR code.

Additionally, it is possible to embed GPS location data into the QR code, allowing users to receive the NFT only when they are at a specific location. This service has a wide range of applications, including events, promotions, and marketing campaigns.