Dev Tutorial: Private Cross-Chain Identity System Built with Oasis Sapphire, ENS and Base

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A new developer tutorial demonstrates how to build a confidential cross-chain identity protocol that keeps sensitive KYC data private while still enabling on-chain compliance checks. The system stores encrypted personally identifiable information, such as date of birth and country, inside smart contracts on Oasis Sapphire, which uses a Trusted Execution Environment to process data without exposing it publicly. When a DeFi protocol on Base needs to verify a user's eligibility, it queries an ENS resolver that triggers a cross-chain message via the Oasis Privacy Layer and Celer Inter-Chain Messaging, receiving only a boolean result. This approach leverages EIP-3668 for off-chain data resolution and ensures that no raw personal data is ever visible on public networks, helping protocols remain compliant with regulations like GDPR. The tutorial uses a Hardhat and Foundry monorepo setup targeting both the Base Ethereum Layer 2 network and the Oasis Sapphire confidential EVM.

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