{"id":"bnb-attestation-service","title":"BNB Attestation Service","content":"**BNB Attestation Service (BAS)** is an identity, attestation, and reputation infrastructure associated with the [BNB Chain](https://iq.wiki/wiki/binance-smart-chain) ecosystem. It provides on-chain and off-chain attestations that link [blockchain](https://iq.wiki/wiki/blockchain) addresses to verified attributes and credentials, exposes APIs and SDKs for developers, and issues a [BEP‑20](https://iq.wiki/wiki/bep-20) token (BAS) on BNB Smart Chain tracked by major market aggregators. BAS is positioned to support use cases ranging from [Web3](https://iq.wiki/wiki/web3) [KYC](https://iq.wiki/wiki/know-your-customer-kyc) and compliant onboarding to access control, reputation, [airdrops](https://iq.wiki/wiki/airdrop), and agent/AI attestation, with integrations and documentation that align closely with BNB Chain’s identity showcase. [\\[1\\]](#cite-id-pzKoEouRRlgWqU59) [\\[2\\]](#cite-id-jrSNxGUT83wV7XEu) [\\[3\\]](#cite-id-2nZJcgTL3Mpe2kGI) [\\[4\\]](#cite-id-KAb1tiBhWYx4l6vb)​\n\n## Overview\n\nBAS 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](https://iq.wiki/wiki/binance-smart-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\\]](#cite-id-KAb1tiBhWYx4l6vb) [\\[2\\]](#cite-id-jrSNxGUT83wV7XEu)​\n\nBeyond 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](https://iq.wiki/wiki/erc-8004) for agent trust syntax and positions itself as an implementation/semantics layer for agent attestations. [\\[1\\]](#cite-id-pzKoEouRRlgWqU59)​\n\nThe BAS token (BAS) exists on [BNB Smart Chain](https://iq.wiki/wiki/binance-smart-chain) and is tracked on market aggregators including [CoinMarketCap](https://iq.wiki/wiki/coinmarketcap), [CoinGecko](https://iq.wiki/wiki/coingecko), and [Bitget](https://iq.wiki/wiki/bitget). These pages provide live market data, [circulating](https://iq.wiki/wiki/circulating-supply)/total supply, and exchange listings. [\\[3\\]](#cite-id-2nZJcgTL3Mpe2kGI) [\\[5\\]](#cite-id-vqToCyfMqJjA8boE) [\\[6\\]](#cite-id-olde5BUmdpVTIcU6)​\n\n## Background and history\n\nPublic materials describe BAS as an identity and attestation stack integrated with the [BNB Chain](https://iq.wiki/wiki/binance-smart-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\\]](#cite-id-KAb1tiBhWYx4l6vb) [\\[2\\]](#cite-id-jrSNxGUT83wV7XEu)​\n\nBAS 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](https://iq.wiki/wiki/binance-smart-chain) applications. [\\[7\\]](#cite-id-MRrrdZwVm85t4uAi)​\n\nThird‑party market pages show token listings and exchange activity, while a project listing on ICODrops summarizes early distribution programs through [Binance](https://iq.wiki/wiki/binance) wallet channels (e.g., Binance Wallet Sale and Booster Program) and Most Valuable Builder program participation. [\\[3\\]](#cite-id-2nZJcgTL3Mpe2kGI) [\\[5\\]](#cite-id-vqToCyfMqJjA8boE) [\\[8\\]](#cite-id-SqZH8p464QdSYcLw)​\n\n## Technical overview\n\n### Architecture and core components\n\n* 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\\]](#cite-id-BUL42MSyFWGOKCzX)\n* Resolver logic: Resolvers are pluggable [smart contracts](https://iq.wiki/wiki/smart-contract) that enforce validation rules before an attestation is recorded on-chain, enabling contextual checks and integration with external verification logic. [\\[9\\]](#cite-id-BUL42MSyFWGOKCzX)\n* On-chain attestations: Attestations can be created and revoked via BAS contracts. On-chain storage makes claims tamper-evident and directly queryable by [dApps](https://iq.wiki/wiki/decentralized-application) and [smart contracts](https://iq.wiki/wiki/smart-contract) on [BNB Chain](https://iq.wiki/wiki/binance-smart-chain) and opBNB. [\\[9\\]](#cite-id-BUL42MSyFWGOKCzX)\n* 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\\]](#cite-id-KAb1tiBhWYx4l6vb) [\\[2\\]](#cite-id-jrSNxGUT83wV7XEu)\n\nThis hybrid design maps off-chain identity checks to verifiable on-chain assertions, enabling compliance-oriented workflows while keeping sensitive data off-chain. [\\[2\\]](#cite-id-jrSNxGUT83wV7XEu)​\n\n### Deployed networks and key contracts\n\nBAS publishes contract addresses across [BNB Chain](https://iq.wiki/wiki/binance-smart-chain) and opBNB for core operations, schema registration, and delegation:\n\n* BNB Chain [Mainnet](https://iq.wiki/wiki/mainnet): BAS: 0x247Fe62d887bc9410c3848DF2f322e52DA9a51bC; Schema Registry: 0x5e905F77f59491F03eBB78c204986aaDEB0C6bDa; Delegate: 0x01dAc45529a070Cb67Fc5B328a7eBE394644355B. [\\[9\\]](#cite-id-BUL42MSyFWGOKCzX)\n* BNB Chain [Testnet](https://iq.wiki/wiki/testnet): BAS: 0x6c2270298b1e6046898a322acB3Cbad6F99f7CBD; Schema Registry: 0x08C8b8417313fF130526862f90cd822B55002D72; Delegate: 0x3b32B97092f09Ad34E5766e239e4C2F76b0DEe43. [\\[9\\]](#cite-id-BUL42MSyFWGOKCzX)\n* opBNB Mainnet/Testnet: BAS and Schema Registry addresses are published in the docs, enabling cross‑rollup use within the BNB ecosystem. [\\[9\\]](#cite-id-BUL42MSyFWGOKCzX)\n\n### Standards and agent reputation\n\nBAS references [ERC‑8004](https://iq.wiki/wiki/erc-8004) for agent trust semantics on its public site and positions itself as an implementation/semantics layer that records agent actions on-chain, computes composable scores, and enables reputation portability and financialization (“reputation as capital”). These claims situate BAS at the intersection of [Web3](https://iq.wiki/wiki/web3) identity and AI/agent systems. [\\[1\\]](#cite-id-pzKoEouRRlgWqU59)​\n\n### Developer resources\n\nThe documentation provides a JavaScript SDK, GraphQL endpoints, quick-start tutorials, and an explorer to browse schemas and attestations. Suggested workflows include creating schemas, issuing attestations, integrating resolvers, and configuring off-chain storage with Greenfield. [\\[4\\]](#cite-id-KAb1tiBhWYx4l6vb) [\\[9\\]](#cite-id-BUL42MSyFWGOKCzX)​\n\n## Tokenomics\n\n### Token identity, contract, and chain\n\n* Name/symbol: BNB Attestation Service (BAS)\n* Standard/chain: [BEP‑20](https://iq.wiki/wiki/bep-20) on BNB Smart Chain\n* Token contract: 0x0f0df6cb17ee5e883eddfef9153fc6036bdb4e37 (as shown on aggregators)\n\nMarket trackers provide the token contract and on‑chain metadata, with BAS typically paired against [WBNB](https://iq.wiki/wiki/wrapped-bnb-wbnb) on [PancakeSwap](https://iq.wiki/wiki/pancakeswap) and listed on multiple [centralized exchanges](https://iq.wiki/wiki/cex-centralized-exchange). [\\[5\\]](#cite-id-vqToCyfMqJjA8boE) [\\[3\\]](#cite-id-2nZJcgTL3Mpe2kGI)​\n\n### Supply and circulating metrics\n\nAggregators report:\n\n* Max/Total supply: 10,000,000,000 BAS\n* Circulating supply: 2,500,000,000 BAS (25% of max in cited snapshots)\n\nExact figures vary over time and should be checked on live aggregator pages for current values. [\\[3\\]](#cite-id-2nZJcgTL3Mpe2kGI) [\\[5\\]](#cite-id-vqToCyfMqJjA8boE)​\n\n### Distribution, listings, and early programs\n\nICODrops documents early BAS distribution via [Binance](https://iq.wiki/wiki/binance) Wallet channels, including:\n\n* [Binance](https://iq.wiki/wiki/binance) Wallet Sale (ended July 17, 2025): reported raise 0.001 each.\n* [Binance](https://iq.wiki/wiki/binance) Wallet Booster Program (ended August 28, 2025): reported 600,000,000 BAS in rewards.\n* MVB (Most Valuable Builder) Season 8 participation (ended November 25, 2024).\n\nThese summaries provide a view of early community distribution; detailed vesting or allocation tables are not fully enumerated in the cited sources. [\\[8\\]](#cite-id-SqZH8p464QdSYcLw)​\n\nCMC and [CoinGecko](https://iq.wiki/wiki/coingecko) show multiple trading venues and pairs, with on‑chain liquidity on [PancakeSwap](https://iq.wiki/wiki/pancakeswap) and additional [centralized exchange](https://iq.wiki/wiki/cex-centralized-exchange) listings. [\\[3\\]](#cite-id-2nZJcgTL3Mpe2kGI) [\\[5\\]](#cite-id-vqToCyfMqJjA8boE)​\n\n### Utility\n\nPublic 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\\]](#cite-id-2nZJcgTL3Mpe2kGI) [\\[6\\]](#cite-id-olde5BUmdpVTIcU6)​\n\n## Products and use cases\n\n### Core products\n\n* 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\\]](#cite-id-KAb1tiBhWYx4l6vb)\n* 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\\]](#cite-id-BUL42MSyFWGOKCzX) [\\[3\\]](#cite-id-2nZJcgTL3Mpe2kGI)\n* 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\\]](#cite-id-2nZJcgTL3Mpe2kGI)\n* 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\\]](#cite-id-pzKoEouRRlgWqU59)\n\n### Primary use cases\n\n* [Web3](https://iq.wiki/wiki/web3) [KYC](https://iq.wiki/wiki/know-your-customer-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\\]](#cite-id-MRrrdZwVm85t4uAi)\n* Access control and gating: [Smart contracts](https://iq.wiki/wiki/smart-contract) and front-ends can gate features, assets, or market participation based on attested attributes (e.g., region eligibility, accreditation). [\\[2\\]](#cite-id-jrSNxGUT83wV7XEu)\n* 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\\]](#cite-id-jrSNxGUT83wV7XEu)\n* RWA and permissioned DeFi: Establish verified attributes tied to addresses for participation in permissioned markets or asset flows. [\\[7\\]](#cite-id-MRrrdZwVm85t4uAi)\n* 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\\]](#cite-id-pzKoEouRRlgWqU59)\n\n### Developer resources and integrations\n\nBAS 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](https://iq.wiki/wiki/know-your-customer-kyc) vendors as issuers and allows consumer [dApps](https://iq.wiki/wiki/decentralized-application) to query attestation state. [\\[4\\]](#cite-id-KAb1tiBhWYx4l6vb) [\\[9\\]](#cite-id-BUL42MSyFWGOKCzX)​\n\n## Adoption, partnerships, exchanges, and market data\n\n### Partnerships and ecosystem alignment\n\n* Sumsub: On September 4, 2025, Sumsub announced a partnership with BAS to issue on‑chain attestations from its identity verification product (Sumsub ID), targeting faster onboarding and reusable credentials across [BNB Chain](https://iq.wiki/wiki/binance-smart-chain) services. [\\[7\\]](#cite-id-MRrrdZwVm85t4uAi)\n* [BNB Chain](https://iq.wiki/wiki/binance-smart-chain): BAS appears in [BNB Chain](https://iq.wiki/wiki/binance-smart-chain)’s identity and attestation showcase, highlighting schemas, resolvers, and Greenfield-backed storage as identity primitives for the ecosystem. [\\[2\\]](#cite-id-jrSNxGUT83wV7XEu)\n\n### Exchange listings and liquidity\n\nAggregators show BAS trading on decentralized venues such as [PancakeSwap](https://iq.wiki/wiki/pancakeswap) v3 (BSC) and multiple centralized exchanges. Market pages provide trading pairs, depth, and venue coverage; exact availability varies over time. [\\[3\\]](#cite-id-2nZJcgTL3Mpe2kGI) [\\[5\\]](#cite-id-vqToCyfMqJjA8boE)\n\n### Market metrics\n\nCMC and [CoinGecko](https://iq.wiki/wiki/coingecko) report live price, volume, and market cap. CMC snapshots also display ATH/ATL and, in some instances, a [CertiK](https://iq.wiki/wiki/certik) security rating widget for the project profile. Figures are dynamic and should be referenced directly on aggregator pages for current values. [\\[3\\]](#cite-id-2nZJcgTL3Mpe2kGI) [\\[5\\]](#cite-id-vqToCyfMqJjA8boE)\n\n## Timeline of key events\n\n* July 23, 2024 — [BNB Chain](https://iq.wiki/wiki/binance-smart-chain) publishes a showcase page detailing BAS’s schema/resolver design, on‑chain and off‑chain attestations, and Greenfield integration. [\\[2\\]](#cite-id-jrSNxGUT83wV7XEu)\n* November 25, 2024 — ICODrops lists BAS participation in Most Valuable Builder (MVB) Season 8 as ended. [\\[8\\]](#cite-id-SqZH8p464QdSYcLw)\n* July 17, 2025 — ICODrops reports the [Binance](https://iq.wiki/wiki/binance) Wallet Sale as ended; $200,000 raised, 200,000,000 BAS allocated at $0.001. [\\[8\\]](#cite-id-SqZH8p464QdSYcLw)\n* August 28, 2025 — ICODrops reports the [Binance](https://iq.wiki/wiki/binance) Wallet Booster Program as ended; total rewards of 600,000,000 BAS. [\\[8\\]](#cite-id-SqZH8p464QdSYcLw)\n* September 4, 2025 — Sumsub announces its partnership with BNB Attestation Service to streamline [Web3](https://iq.wiki/wiki/web3) identity verification with reusable on‑chain attestations. [\\[7\\]](#cite-id-MRrrdZwVm85t4uAi)\n* Market milestones — Aggregators record market extremes and ongoing listings for BAS (e.g., ATH/ATL on CMC historical datasets), reflecting token market activity across 2025–2026. [\\[3\\]](#cite-id-2nZJcgTL3Mpe2kGI)","summary":"BNB Attestation Service (BAS) is BNB Chain–native identity and attestation infrastructure. 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