In the Web3 era, data authenticity and ownership are central concerns. BNB Attestation Service (BAS), a key infrastructure within the BNB ecosystem, provides users with both on-chain and off-chain attestation services. BAS helps users verify information authenticity. It protects data privacy. It also enables data to be treated as assets.

What Is BNB Attestation Service

Source: https://www.bnbattest.io/

BAS is a standardized attestation generation and verification service. Users can create any type of attestation on BAS, bringing information into the Web3 ecosystem. Then, they can store it in Greenfield or other solutions to ensure both ownership and access control over their data.

BAS addresses two fundamental issues:

• How to guarantee data authenticity
• How to help users establish ownership of their attestations

With BAS, users can verify information and convert data into assets, enabling free exchange and data value to circulate.

How BAS Works

The BAS workflow includes the following steps:

Schema Registration: Users first register a schema in the Schema Registry Contract. They define the data structure, whether it is revocable, and the resolver (optional verification contract).

Create Attestation:

• On-chain Attestation: Created based on the schema, validated by the resolver, and recorded in the BAS contract
• Off-chain Attestation: Stored in Greenfield, with access controls set through the BAS contract

Attestation Revocation: The attestor can revoke invalid attestations at any time, supporting dynamic data updates.

BAS also provides SDK support, allowing users to generate zero-knowledge proofs with BNB Passport and apply them to other contracts, such as Pancake v4, RWA, or airdrops.

Schema and Composability

A schema defines the data structure and verification logic. Each schema contains a UID, creator address, field types, and an optional resolver. BAS’s modular design lets users reference other attestations via refUID to build complex data compositions. Examples include:

• Basic Account Information Schema: Name, age, profile picture
• KYC attestations referencing a user’s basic account information
• Social Media attestations: Likes or comments referencing the original content attestation

This composability makes BAS work like Lego bricks, allowing users to flexibly assemble data structures to meet diverse application needs.

Data Ownership and Access Control

Web3’s foundation is complete user ownership of data. BAS supports the storage of off-chain attestations in Greenfield, and you can grant access permissions through NFTs or smart contracts to specific users, enabling data to be treated as assets.

Sample Application: Decentralized LinkedIn

• User creates off-chain attestations: personal bio, contact details, resume
• Set access conditions: possession of certain NFTs, passing KYC, or joining a specific DAO
• Charge for access or resell access rights, allowing data value to circulate

Revocation Mechanism and Use Cases

BAS allows for the revocation of revocable attestations to keep data authenticity up-to-date. For example, a student's "enrolled" attestation can be revoked after graduation.

Revocation Methods:

• On-chain: invoke the revoke function
• Off-chain: invoke revokeOffchain(uid)

Summary

BNB Attestation Service delivers a comprehensive solution for Web3 data verification and ownership management. Through on-chain and off-chain attestations, modular schemas, composability, and access control, BAS ensures data within the Web3 world is both reliable and can be treated as assets. Whether for decentralized social networks, professional platforms, or other use cases, BAS offers users convenience and new possibilities.

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