Sumsub and Linea Showcase New On-Chain Identity Attestations via Verax

Sumsub on-chain identity attestations are now live via Verax, as the global identity verification company works with Linea to improve the standards for blockchain identity verification. The goal of this partnership is to make it easier for people to prove their identity in Web3 settings by using safe, decentralised credentials.

This marks the second public rollout of Sumsub’s on-chain attestation capabilities, following the successful debut of the Sumsub ID integration with Solana’s Attestation Service at Accelerate New York in May 2025. Sumsub ID is part of the company’s Reusable Digital Identity product suite, launched in March 2025. The product enables end-users to pre-verify themselves and securely store and reuse their documents for multiple verifications across Sumsub client platforms, simplifying compliance and improving end user experience.

Users begin on the Linea Hub and they are then redirected to Sumsub to create a Sumsub ID, undergoing a fast and secure Liveness check to confirm they are a real human. After connecting their MetaMask wallet, an AML check is performed on the wallet address in the background, to ensure that sanctioned wallets are not able to use the service.

Once verified, Sumsub issues an on-chain attestation to the user’s wallet using the Verax Attestation Service. This credential is recorded on the Linea blockchain and visible on its explorer. Users are then prompted to explore the Linea ecosystem of dApps using their newly verified wallet, with gas fee refunds processed according to offer terms. Linea is supporting the initiative through ensuring  every user who creates an attestation will receive twenty free transactions on Linea.

This new flow highlights how on-chain credentials, such as attestations confirming a user is a real human, can enhance Web3 experience and trust, by allowing to programmatically verify humanity and uniqueness in a web3-native programmatic way, while preserving privacy. As these credentials are recorded publicly on-chain, they can be reused by any dApp within the Linea ecosystem, helping drive seamless interoperability and a more connected user journey. The integration also aligns with the growing trend toward reusable digital identity, enabling frictionless access to multiple services while helping ecosystems scale securely.

Verax attestations are issued gas-free and require no document uploads unless specified. For future use cases requiring more stringent KYC, Sumsub ID supports pre-verification and optional storage of user identity documents to fast-track future onboarding.

“Our integration with Linea marks a powerful next step in our mission to bring reusable, privacy-first identity to every corner of Web3,” said Ilya Brovin, Chief Growth Officer at Sumsub. “As more ecosystems adopt on-chain credentials, we’re building the infrastructure needed for users to verify once and remove unnecessary repetition and friction – without compromising on high security standards. By combining gasless attestations with Layer 2 scalability, this rollout integration helps to ensure a more user-centric, secure, and interconnected Web3.”

Sumsub ID allows individuals to pre-verify once and reuse their identity data across multiple services. It can reduce onboarding time by up to 50% and boost conversion rates by 30%, offering businesses a more efficient route to compliance while improving user experience.

To create your Sumsub ID profile and receive your own Solana attestation, visit id.sumsub.com/linea-liveness.

By launching Sumsub on-chain identity attestations through Verax, the firm is making it possible for decentralised ID attestations to be safe and grow. This is a big step towards making identity verification on the Web3 platform more reliable.