BNB Attestation Service

BNB Attestation Service (BAS) is an identity, attestation, and reputation infrastructure associated with the BNB Chain ecosystem. It provides on-chain and off-chain attestations that link blockchain addresses to verified attributes and credentials, exposes APIs and SDKs for developers, and issues a BEP‑20 token (BAS) on BNB Smart Chain tracked by major market aggregators. BAS is positioned to support use cases ranging from Web3 KYC and compliant onboarding to access control, reputation, airdrops, and agent/AI attestation, with integrations and documentation that align closely with BNB Chain’s identity showcase. ^{[1] [2] [3] [4]}​

Overview

BAS is designed as a modular attestation and identity layer where structured assertions (“attestations”) about accounts, identities, assets, skills, or behaviors can be issued by trusted parties and verified by applications. It supports a schema-and-resolver model for standardizing attestations, publishes registry contracts on BNB Chain and opBNB, and offers optional off-chain storage through BNB Greenfield to balance verifiability with privacy. The project is included in BNB Chain’s official identity/attestation documentation, reflecting ecosystem alignment. ^{[4] [2]}​

Beyond conventional identity workflows, BAS’s official site frames an expanded scope for “agent” reputation: recording agent actions on-chain, producing composable scores (agent/skill/market), and enabling reputation to function as portable, tradable capital. BAS references emerging standards such as ERC‑8004 for agent trust syntax and positions itself as an implementation/semantics layer for agent attestations. ^[1]​

The BAS token (BAS) exists on BNB Smart Chain and is tracked on market aggregators including CoinMarketCap, CoinGecko, and Bitget. These pages provide live market data, circulating/total supply, and exchange listings. ^{[3] [5] [6]}​

Background and History

Public materials describe BAS as an identity and attestation stack integrated with the BNB Chain ecosystem. Documentation details how the service defines attestations, resolvers, and storage, while ecosystem pages highlight BAS within BNB Chain’s identity showcase. The BNB Chain showcase carried a dated page (July 23, 2024), indicating public documentation of BAS features by mid‑2024. ^{[4] [2]}​

BAS and ecosystem partners announced integrations aimed at connecting off‑chain verification with on‑chain attestations. A notable partnership with Sumsub (a global identity verification provider) was announced on September 4, 2025, describing Sumsub’s role as an attestation issuer feeding verified credentials into BAS for reuse across BNB Chain applications. ^[7]​

Third‑party market pages show token listings and exchange activity, while a project listing on ICODrops summarizes early distribution programs through Binance wallet channels (e.g., Binance Wallet Sale and Booster Program) and Most Valuable Builder program participation. ^{[3] [5] [8]}​

Technical overview

Architecture and Core Components

• Schema registry: BAS uses a schema registry contract to define the structure of attestations. Each schema describes fields, revocability, and optionally specifies a resolver to validate attestations before creation. This schema-first approach standardizes how claims are expressed and verified. ^[9]
• Resolver logic: Resolvers are pluggable smart contracts that enforce validation rules before an attestation is recorded on-chain, enabling contextual checks and integration with external verification logic. ^[9]
• On-chain attestations: Attestations can be created and revoked via BAS contracts. On-chain storage makes claims tamper-evident and directly queryable by dApps and smart contracts on BNB Chain and opBNB. ^[9]
• Off-chain attestations: BAS supports off-chain attestations, with BNB Greenfield noted as an example storage layer. Off-chain records can remain private with access control while still being verifiable via schema/resolver mechanisms, and can be “pinned” if public access is required. ^{[4] [2]}

This hybrid design maps off-chain identity checks to verifiable on-chain assertions, enabling compliance-oriented workflows while keeping sensitive data off-chain. ^[2]​

Deployed Networks and Key Contracts

BAS publishes contract addresses across BNB Chain and opBNB for core operations, schema registration, and delegation:

• BNB Chain Mainnet: BAS: 0x247Fe62d887bc9410c3848DF2f322e52DA9a51bC; Schema Registry: 0x5e905F77f59491F03eBB78c204986aaDEB0C6bDa; Delegate: 0x01dAc45529a070Cb67Fc5B328a7eBE394644355B. ^[9]
• BNB Chain Testnet: BAS: 0x6c2270298b1e6046898a322acB3Cbad6F99f7CBD; Schema Registry: 0x08C8b8417313fF130526862f90cd822B55002D72; Delegate: 0x3b32B97092f09Ad34E5766e239e4C2F76b0DEe43. ^[9]
• opBNB Mainnet/Testnet: BAS and Schema Registry addresses are published in the docs, enabling cross‑rollup use within the BNB ecosystem. ^[9]

Tokenomics

Token identity, contract, and chain

• Name/symbol: BNB Attestation Service (BAS)
• Standard/chain: BEP‑20 on BNB Smart Chain
• Token contract: 0x0f0df6cb17ee5e883eddfef9153fc6036bdb4e37 (as shown on aggregators)

Market trackers provide the token contract and on‑chain metadata, with BAS typically paired against WBNB on PancakeSwap and listed on multiple centralized exchanges. ^{[5] [3]}​

Supply and circulating metrics

Aggregators report:

• Max/Total supply: 10,000,000,000 BAS
• Circulating supply: 2,500,000,000 BAS (25% of max in cited snapshots)

Exact figures vary over time and should be checked on live aggregator pages for current values. ^{[3] [5]}​

Distribution, listings, and early programs

ICODrops documents early BAS distribution via Binance Wallet channels, including:

• Binance Wallet Sale (ended July 17, 2025): reported raise 0.001 each.
• Binance Wallet Booster Program (ended August 28, 2025): reported 600,000,000 BAS in rewards.
• MVB (Most Valuable Builder) Season 8 participation (ended November 25, 2024).

These summaries provide a view of early community distribution; detailed vesting or allocation tables are not fully enumerated in the cited sources. ^[8]​

CMC and CoinGecko show multiple trading venues and pairs, with on‑chain liquidity on PancakeSwap and additional centralized exchange listings. ^{[3] [5]}​

Utility

Public project and market pages describe BAS as a utility token within the attestation ecosystem, associated with identity/reputation products (e.g., BAS Verify SDK, attestation registry). ^{[3] [6]}​

Products and Use Cases

Core Products

• Attestation Registry: On‑chain registry of structured, signed attestations linked to addresses; supports issuance, verification, and revocation flows through schema-defined logic and optional resolvers. ^[4]
• Verify SDK and APIs: Developer modules to integrate permissioning, personalization, and compliance checks based on attestations, abstracting verification and query logic for dApps and services. ^{[9] [3]}
• BNB Passport: An identity aggregation concept described on market pages that combines exchange KYC and identities (e.g., Space ID) into a reusable identity layer for BAS-enabled services. ^[3]
• Agent reputation layer: Site materials highlight recording agent actions on-chain, computing multi-level scores (agent/skill/market), and enabling composable, tradable reputation built atop attestation standards. ^[1]

Primary Use Cases

• Web3 KYC and compliant onboarding: Map results from regulated identity providers (e.g., Sumsub) into reusable attestations that can be checked by dApps, reducing repeated KYC while supporting compliance. ^[7]
• Access control and gating: Smart contracts and front-ends can gate features, assets, or market participation based on attested attributes (e.g., region eligibility, accreditation). ^[2]
• Airdrops and Sybil resistance: Use attestations to target distributions and reduce multi-account abuse while preserving privacy via off-chain storage and schema controls. ^[2]
• RWA and permissioned DeFi: Establish verified attributes tied to addresses for participation in permissioned markets or asset flows. ^[7]
• Agent/AI trust and scoring: Create verifiable agent activity trails and composable scores that can inform marketplace trust, coordination, and potential financialization of reputation. ^[1]

Developer Resources and Integrations

BAS publishes SDKs, GraphQL APIs, tutorials, and a quick-start to create schemas, issue attestations, implement resolvers, and manage off-chain storage. The integration model supports third‑party identity/KYC vendors as issuers and allows consumer dApps to query attestation state. ^{[4] [9]}​