This repo demonstrates how a passkey can be used to interact with the new P256VERIFY precompile deployed to address 0x0000000000000000000000000000000000000100 (currently on Mumbai testnet).
The EIP allows for verification of P256 signatures for 3450 gas, comparable to the 3000 gas required for the ECRECOVER precompile.
The passkey handling was managed using react-native-passkeys