The original title is: "Building a Confidential Cross-Chain Identity Protocol with Oasis Sapphire, ENS & Base"

Short summary

An advanced tutorial for building a confidential cross-chain identity layer using Oasis Sapphire (confidential EVM with TEE), Base (Ethereum L2), ENS, and Celer IM. Users store encrypted KYC data on Sapphire; when a DeFi protocol on Base queries the ENS resolver, a cross-chain message triggers computation inside a TEE that returns only a boolean compliance proof — no PII ever leaks. The article includes Solidity contract code, a monorepo structure, and a step-by-step architecture diagram.

• •Users store encrypted PII in Oasis Sapphire's TEE; DeFi protocols on Base receive only boolean compliance proofs via cross-chain messaging
• •Uses EIP-3668 (CCIP-Read) for off-chain data resolution and Celer IM for state synchronization between Base and Sapphire
• •Includes full Solidity contract examples for ConfidentialVault and a Hardhat/Foundry monorepo setup for multi-chain deployment

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