Pr3sence is a crypto-native ad server developed specifically for web3 applications. Their platform delivers cookie-free and privacy-centric advertisements on the blockchain. Web3 advertisers use Pr3sence to specify a desired target audience based on category and other on-chain profile characteristics (no personally-identifying information or cookies are required). Pr3sence then leverages machine learning techniques to determine the appropriate placements for a particular ad, and provides report and campaign performance information to the advertiser. Publishers, usually web3 products and services, opt in to display ads served by Pr3sence, and are compensated for their participation in the ecosystem.