What is BNB Attestation (BAS)?

Quick Facts

  • Chain: BNB Smart Chain (BEP-20)
  • Purpose: Decentralized attestation and identity infrastructure
  • Explorer: BASCAN (bascan.io)
  • Key product: BNB Passport — portable on-chain identity
  • Backing: BNB Chain Hackathon winner; BNB Chain grant recipient; Binance MVB8 incubatee
  • Storage: On-chain (BSC, opBNB) and off-chain (BNB Greenfield)
  • Developer tools: SDKs, GraphQL APIs, and no-code schema builder

Introduction

BNB Attestation Service (BAS) is the native attestation and reputation layer built for the BNB Chain ecosystem. It provides a standardized infrastructure for issuing, storing, and verifying cryptographic proofs — called attestations — about identities, assets, credentials, and behaviors.

In a Web3 world increasingly challenged by bots, fake accounts, and opaque data, BAS aims to be the foundational trust layer that connects real-world information to on-chain applications.

History & Background

BAS was founded and began building within the BNB ecosystem, ultimately winning a BNB Chain Hackathon and securing an official BNB Chain grant. The project was later selected for Binance MVB (Most Valuable Builder) Incubation Season 8, backed by Binance Labs and CoinMarketCap.

The protocol's native BAS token was introduced in 2025 and received early market distribution through Binance Alpha, bringing wider visibility to the project.

How BNB Attestation Works

At its core, BAS uses a schema-and-resolver model. A schema defines the structure of data to be attested — for example, KYC status, asset ownership, or on-chain activity history. A trusted issuer then signs and publishes an attestation based on that schema.

Attestations can be stored in two ways:

  • On-chain on BSC or opBNB for full transparency and composability.
  • Off-chain on BNB Greenfield, where users retain ownership and control access via zero-knowledge proofs.

The BASCAN explorer serves as the user interface for browsing schemas, creating attestations, and revoking them — all without requiring coding knowledge. Developers can integrate BAS via SDKs or GraphQL APIs for more advanced workflows.

Tokenomics

The BAS token is the native utility and governance asset of the protocol. It is distributed across ecosystem incentives, a community treasury, team allocations, and liquidity provisions — following a vesting schedule designed to align long-term stakeholder interests.

Token holders can participate in community programs such as the BAS Booster Program, which rewards users for holding and engaging with the ecosystem.

Circulating supply ? 2.50 billion BAS
Reserved supply ? 0 BAS
Burned
0x0000000000000000000000000000000000000001
0 BAS
Total supply ? 2.50 billion BAS
Max supply ? 10.00 billion BAS
Updated 5h ago

Ecosystem & Use Cases

BAS powers several practical applications across the BNB ecosystem:

  • BNB Passport: Aggregates user credentials from exchanges, on-chain activity, and KYC providers into a single portable identity profile.
  • DeFi & token launches: Prevents Sybil attacks by verifying unique human users for airdrops and IDOs.
  • Real World Assets (RWA): Provides proof-of-asset ownership for tokenized real estate, commodities, and equities.
  • AI agents: The ERC-8004 standard enables on-chain identity and reputation tracking for autonomous AI agents.
  • Compliance: Allows KYC and AML verification without exposing sensitive personal data on-chain.

Team, Governance & Community

The BAS team operates under the BAS Foundation (@BAS_FDN) and maintains an active community presence with over 244,000 followers on X. The project is officially recognized within BNB Chain's identity and attestation documentation, reflecting deep ecosystem alignment.

Governance is community-oriented, with token-based participation mechanisms being progressively introduced.

Advantages

  • Privacy-first design: Zero-knowledge proofs and BNB Greenfield storage keep sensitive data user-controlled.
  • Flexible architecture: Supports both on-chain and off-chain attestations for different use-case needs.
  • Composable attestations: Reference fields allow attestations to link together, building complex verification networks.
  • No-code access: BASCAN makes the platform accessible to non-technical users.
  • Strong ecosystem backing: BNB Chain grants, Binance Labs incubation, and official BNB Chain documentation integration.

Risks & Challenges

  • Adoption dependency: The protocol's value grows with usage; limited dApp adoption constrains network effects.
  • Issuer trust assumptions: Attestations are only as reliable as the issuers who sign them.
  • Competitive landscape: Protocols like Ethereum Attestation Service compete in the broader attestation space.
  • Token volatility: As a relatively new token, BAS has experienced significant price swings since launch.

Long-Term Vision

BAS aims to become the foundational trust layer for the entire BNB Chain ecosystem — and eventually a cross-chain reputation standard. By expanding its schema library, deepening AI agent integrations, and powering compliance for RWA and DeFi, the project envisions a Web3 where verifiable identity and programmable reputation are universal primitives across all decentralized applications.

Frequently Asked Questions

BNB Attestation Service is a decentralized infrastructure on BNB Chain that enables the issuance, storage, and verification of cryptographic attestations. These attestations represent verifiable claims about identity, assets, credentials, or on-chain behavior.

An attestation is a signed, cryptographic proof that a specific claim is true — for example, that a user has completed KYC or owns a particular asset. Attestations on BAS are structured using predefined schemas and can be stored on-chain or off-chain.

BASCAN is the official explorer and user interface for the BAS protocol. It allows both technical and non-technical users to browse schemas, create attestations, inspect records, and revoke them without needing to write any code.

BNB Passport is a flagship product of BAS that aggregates a user's credentials — such as exchange KYC status and on-chain activity — into a single portable, verifiable identity profile on BNB Chain.

BAS uses zero-knowledge proofs and optional off-chain storage via BNB Greenfield to ensure sensitive data is never directly exposed on-chain. Users retain ownership and control over who can access their attestation data.

ERC-8004 is a standard introduced by BAS for AI agent identity and reputation. It allows NFTs to represent verifiable AI agent behavior, enabling on-chain trust records for autonomous agents operating in the BNB ecosystem.

BAS supports Sybil-resistance for DeFi and token launches, KYC/AML compliance without data exposure, real-world asset ownership proofs, AI agent reputation tracking, and cross-application identity portability.

BAS won a BNB Chain Hackathon and subsequently received an official BNB Chain grant. It was later selected for Binance MVB Incubation Season 8, backed by Binance Labs and CoinMarketCap, cementing its role as a core BNB ecosystem project.