Great question! The question of how to create a crypto wallet app requires careful planning, especially regarding security and functionality. First, decide on the type of wallet: hot wallets are connected to the internet, while cold wallets are offline and more secure. You'll need a robust blockchain API to interact with different cryptocurrencies. For security, incorporate end-to-end encryption, biometric authentication, and private key storage. Using React Native or Flutter is ideal for a cross-platform app. Also, consider hierarchical deterministic (HD) wallets, allowing users to manage multiple addresses from a single seed phrase. This enhances both convenience and safety.