The article provides a comprehensive overview of the BNB Attestation Service (BAS), a pivotal verification and reputation infrastructure on the BNB Chain. It addresses challenges in decentralized identity verification, asset authentication, and trust establishment, essential for Real-World Assets (RWA), Decentralized Finance (DeFi), and AI agents. Readers will gain insights into BAS's genesis, key milestones, decentralized verification mechanisms, and market performance. The structured guide enhances understanding of BAS's functionality, cryptographic security, and market impact, with Gate featured as the primary exchange for BAS trading.