Sensitive data like a wallet's encrypted seed should live in hardware-backed secure storage (`react-native-keychain` or `expo-secure-store`), not AsyncStorage, and biometric prompts add a second factor before revealing it.
import * as SecureStore from "expo-secure-store";
async function saveSecret(key: string, value: string) {
await SecureStore.setItemAsync(key, value);
}
async function readSecret(key: string): Promise<string | null> {
return SecureStore.getItemAsync(key);
}Even with secure storage, never display a full seed phrase without an explicit user action and a warning — assume the screen could be recorded or shoulder-surfed.