I’m building a production-ready crypto wallet in Flutter that can live on both iOS and Android. The core goal is to give end users an all-in-one experience: safely store multiple coins over 50+ blockchains, send and receive across chains, swapping, debit card payments, on/off ramp and keep an eye on real-time price movements without leaving the app. Here’s how I picture the flow. On first launch the user creates or imports a BIP-39 seed phrase; all keys stay on-device, encrypted. From there they can switch between BTC, ETH and LTC accounts, view balances pulled from the relevant chains, initiate transactions with adjustable fees, and watch live price data (CoinGecko API or similar). A simple, intuitive UI built with Flutter’s Material 3 would be ideal, but I’m open to Cupertino styling tweaks for iOS polish. I’ll need: • Full Flutter/Dart source, cleanly structured and documented • Build-ready Android (.aab) and iOS (.ipa or TestFlight) outputs • Brief setup guide covering wallet creation logic, key storage approach, third-party APIs, and steps to compile new builds Security best practices are non-negotiable—please defend against common mobile attack vectors, use strong encryption for private keys, and never route seed phrases through external servers. If you have prior experience with packages like web3dart, bitcoin_flutter, flutter_secure_storage, or similar, that will give us a head start. Let me know how you would tackle cross-chain transaction handling and any suggestions you have for future token expansion. Looking forward to your approach and timeline.