The biggest paradox in Web3 identity is that while we demand privacy in the real world, our on-chain infrastructure defaults to absolute transparency. If you attach a KYC credential, credit score, or real name to your ENS domain, it is immediately indexable by anyone.
But what if you could store your sensitive Personally Identifiable Information (PII) inside a secure enclave, and only expose cryptographic proofs of that data to smart contracts on other chains?
In this advanced tutorial, we are building a Confidential Cross-Chain Identity Layer. We will use Oasis Sapphire (the first confidential EVM) as our secure vault, Base (Ethereum L2) as our execution environment, and the Oasis Privacy Layer (OPL) via Celer IM to bridge the two.
The Real-World Use Case: Compliant DeFi on Base
Imagine a DeFi lending protocol on Base that requires users to be non-US citizens and over 18 to access leverage.
