Sumsub Integrates with Chainlink to Enable Reusable Privacy-Preserving KYC Across Multiple Blockchains

Identity verification provider Sumsub has integrated with Chainlink’s Cross-Chain Identity framework to enable privacy-preserving, reusable KYC credentials for compliance use cases spanning multiple blockchain networks simultaneously. The integration allows users who complete a Sumsub identity verification to receive an encrypted, verifiable credential that can be attested across Ethereum, Arbitrum, Avalanche, Polygon, and Base without re-submitting personal data to each protocol or application.

Sumsub’s contribution to the integration is its existing identity proofing pipeline, which includes document authenticity checks, facial biometric comparison, real-time liveness detection, and AML screening. After the user completes Sumsub’s KYC flow and signs a message proving wallet ownership, Chainlink’s Automated Compliance Engine (ACE) issues a Cross-Chain Identity (CCID) credential, a reusable, privacy-preserving attestation that carries verified claims, such as confirmation that a user is over 18, without exposing underlying personal data. No raw personal information ever touches the chain.

The privacy model relies on selective disclosure: an attestation can confirm a user’s compliance status to a receiving smart contract or decentralized application without exposing the underlying personal data. CCID also supports linking a single verified identity to multiple wallets, eliminating the need to repeat KYC at every entry point. This design is intended to satisfy the know-your-customer and anti-money-laundering requirements increasingly required by decentralized finance protocols, tokenized asset platforms, and regulated exchanges operating across multiple jurisdictions.

The Chainlink integration extends a strategy Sumsub has been building since it launched Sumsub’s reusable KYC product suite in March 2025, and continues with Sumsub’s reusable identity on Solana, the company’s first blockchain-native attestation deployment, which launched in May 2025. The Chainlink partnership extends that model from the Solana ecosystem to a set of EVM-compatible networks where regulated DeFi activity is concentrated.

Analysis published in September 2025 projected significant blockchain-based identity market growth through 2034, driven by KYC and cross-border compliance demand. Sumsub extended its crypto exchange compliance work the same week with a partnership with exchange MEXC.

The integration is also technically distinct from simpler on-chain KYC approaches that store compliance status directly in a smart contract. Because the underlying personal data never touches the destination chain and credential issuance and verification run through ACE, the architecture is designed to remain compatible with data minimization requirements under frameworks such as the EU General Data Protection Regulation, which restrict the storage of personal data in immutable ledgers. A second phase of the deployment, scheduled for summer 2026, will extend the model to asset issuers as end users.

Sources: PR Newswire, Sumsub, Chainlink ACE

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By the ID Tech Editorial Team