Multichain Crypto Wallet App Development

**Project Title:** Multichain Crypto Wallet App (Android & iOS) with Custom Blockchain Integration I'm looking for an experienced blockchain/mobile developer or team to build a secure, non-custodial cryptocurrency wallet app for Android and iOS, similar in functionality to Trust Wallet (UI/UX will be provided separately — this project is focused on core wallet functionality and security). Core Requirements: 1. Platform: Native or cross-platform app for both Android and iOS (React Native / Flutter acceptable if performance and security are not compromised) 2. Multichain Support: Wallet must support multiple existing blockchain networks (Ethereum, BSC, Bitcoin, Solana, etc. — final list to be discussed) 3. Custom Blockchain Integration: Must integrate support for our own custom blockchain network and its native coin (details and node/RPC access will be shared with the selected developer) 4. Security (non-negotiable): - Non-custodial — private keys generated and stored only on the user's device, never on any server - HD Wallet standard (BIP-32/39/44) — single seed phrase generates all addresses across chains - Keys encrypted using secure device storage (Android Keystore / iOS Keychain) - All transaction signing must happen locally on-device - Biometric/PIN app lock 5. In-App Browser: Built-in dApp/website browser so users can connect the wallet to decentralized apps and websites directly within the app (similar to Trust Wallet's DApp browser / WalletConnect support) 6. Clean, maintainable codebase with documentation, since further features will be added over time. 7. Documentation: User guide + basic maintenance/support documents. What I'll provide: - Custom blockchain network details (node/RPC endpoints, technical specs) - Native coin specifications - Branding/UI assets (once development-ready) What I'm looking for in a freelancer: - Prior experience building crypto wallets or working with wallet SDKs (e.g., Trust Wallet Core, WalletConnect, ethers.js/web3.js) - Experience integrating custom/non-standard blockchain networks is a big plus - Strong understanding of key management and mobile app security best practices. Please share relevant past work (wallet apps, GitHub, or similar projects) along with your estimated timeline and budget.