CCIP-Read / EIP-3668
CCIP-Read allows for offchain (including Layer 2) lookups of data in a way that is transparent to clients and provides contract authors to implement whatever validation is necessary
The technical specification for CCIP-Read is set out in Ethereum Improvement Proposal (EIP) 3668. View EIP-3668 here.
For a technical explainer of how CCIP-Read works, and the problem statement that was solved, watch this video of Nick.eth on Ethereum Cat Herders Youtube channel.
cb.id by Coinbase
For more information on subdomains issued by Coinbase on cb.id using CCIP-Read, click here.