BAS (BNB Attestation Service) is the native verification and reputation layer on BNB Chain, supporting privacy-preserving on-chain and off-chain attestations for KYC, identity, and asset verification. Designed for scalability and compliance, BAS powers real-world asset tokenization, DeFi, and token launches across the Binance ecosystem. It enables users to manage their verifications, control data sharing, and store attestations via BNB Greenfield—providing essential infrastructure for trust and transparency in Web3.