Attendance sheets for crypto users, usually with collectibles as rewards for being present at events.
The Proof of Attendance Protocol (POAP) is an Ethereum protocol that is used to record and reward users’ attendance of events. The protocol designs these rewards which are in the form of collectibles, usually non-fungible tokens (NFTs), and distributes them to the attendees as ERC-721 tokens. These NFTs are freely distributed and are the equivalent of concert tickets with the added attribute of being unique and tradable.
POAP NFTs are used to motivate users for crypto events. Because they are free, such [virtual] events are largely seen as opportunities to earn free tokens which can then be traded in NFT marketplaces.