Verifiable Credentials
Web3 / privacy technology
A W3C open standard for digitally signed attestations about a subject, structured so that the credential's authenticity and the identity of its issuer can be cryptographically verified by any relying party without contacting the issuer directly. A verifiable credential consists of claims made by an issuer about a subject (for example, a university asserting that a person holds a degree), a cryptographic signature by the issuer that can be verified against a public key, and optional metadata including expiry dates and credential schemas. Verifiable credentials are designed to be privacy-preserving: selective disclosure allows holders to share only specific claims from a credential without revealing the full content, and zero-knowledge proofs can prove properties of credentials without revealing the credentials themselves. In the blockchain context, verifiable credentials complement on-chain attestations by providing a standard that bridges to existing off-chain identity systems. Example: The Ethereum Attestation Service (EAS) enables verifiable credential-like functionality on Ethereum, allowing any entity to issue attestations conforming to published schemas that can be verified on-chain or off-chain. A KYC provider can issue an attestation confirming that a wallet address has passed verification, and any smart contract or application can verify that attestation cryptographically without contacting the KYC provider, enabling compliant DeFi interactions with minimal data exposure. Why it matters for Web3: Verifiable credentials are the bridge between the Web3 identity ecosystem and established real-world credentialing systems including educational institutions, employers, government agencies, and financial regulators. By providing a standard that both worlds can adopt, they enable on-chain applications to make access control decisions based on real-world verified facts without centralizing sensitive personal data in a single registry. Standards alignment between W3C verifiable credentials and blockchain-native attestation systems is an important ongoing technical and governance challenge.
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