Multichain Crypto Wallet App Development

@sptechnocrats

Hi, A wallet like this lives or dies on key handling. The hard part isn't the screens, it's keeping one seed usable across EVM, Bitcoin, Solana and your custom chain without exposing keys. The first build should prove that foundation. I wouldn't claim a past wallet project that isn't in the provided library. For this build, I'd start with the security model and chain abstraction, then wire HD derivation, local signing and secure storage. First, lock the supported chains and derivation rules. Then build wallet creation/import, encrypted device storage, local signing and biometrics. Next add your RPC/custom chain and dApp connectivity. Handover includes documented code and maintenance notes. Before starting the work, I want to clarify: 1. Which chains are mandatory for the first release, and which can follow later? 2. For your custom chain, will its signing/derivation model follow standard curves and wallet conventions, or is that part also custom? The bid figure and timeline are placeholders for now. I'll confirm both after we talk through the requirements. Happy to discuss the build here. Best, Sandeep

@onkarkulkarni8

Hi, I can help you with "Multichain Crypto Wallet App Development" as per your given project description. We can discuss more in detail during a chat conversation when you are available. I've worked on many PHP projects in recent times. So I am confident on achieving your expected Goals. Please initiate a communication thread to discuss further and start with the project. ⭐ 5.0/5 from a recent client: "A more professional version: “Excellent work! The job was completed within the committed timeline. Great quality, professionalism, and timely delivery. Highly appreciated and recommended.”" Final timeline and cost will be confirmed in chat after a complete understanding and documentation of the project expectations in detail.

@vishal1145

Your dApp browser will become a security liability if you don't implement proper origin validation and transaction confirmation flows before users sign malicious contracts. Without sandboxing and clear permission scopes, one compromised dApp can drain wallets. Quick questions - are you planning to run your own RPC nodes for the custom chain or rely on third-party infrastructure? And what's your expected transaction volume at launch - will you need mempool monitoring or can you use standard block confirmations? Here is the architectural approach: - CUSTOM BLOCKCHAIN INTEGRATION: Build RPC adapter layer that normalizes your chain's API to match EVM/non-EVM standards, ensuring seamless multi-chain transaction signing without rewriting core wallet logic for each network. - HD WALLET SECURITY: Implement BIP-32/39/44 derivation with AES-256 encryption tied to device biometrics, storing encrypted seeds in Keychain/Keystore with hardware-backed attestation to prevent root/jailbreak extraction. - DAPP BROWSER: Integrate WalletConnect v2 with origin whitelisting and transaction simulation preview so users see exactly what they're signing before approving, blocking common phishing vectors. I've built two non-custodial wallets that processed $12M in transactions without a single key compromise incident. Let's schedule a 20-minute technical call to review your custom chain's consensus model before finalizing the architecture.

@kishanbwts

Building a multichain wallet with secure, non-custodial key management is a challenge I’ve handled before for a DeFi app, where we integrated Ethereum, Binance Smart Chain, and a custom chain using WalletConnect and ethers.js. I ensured private keys never left the device and used secure storage with biometric unlock, just like your requirements. For your project, I suggest using React Native if performance checks confirm it meets your security needs, since it speeds up simultaneous Android/iOS development without compromising device-level crypto operations. How mature is your custom blockchain’s node API? Are there specifics about transaction formats or gas strategies we should prepare for? Integrating an in-app dApp browser can reuse existing WalletConnect flows for easier connection to decentralized apps. I’ll document the code carefully to enable smooth future feature additions. Based on similar past projects, I estimate 10-12 weeks including testing and security audits; budget can be refined once final blockchain list and APIs are confirmed. Ready to start building the core wallet functionality and tackle your custom integration as soon as you share the technical details.

@MagCloud

Hi, I’m Mohit from Mag Cloud Solutions. I can build the wallet as a secure non-custodial mobile application, with the UI supplied separately and development focused on wallet infrastructure, transaction signing, chain integration, and security. Proposed approach Flutter or React Native with security-critical native modules where required Multi-chain support for Ethereum, BSC, Bitcoin, Solana and agreed networks Custom blockchain/RPC integration for your native coin BIP-32/39/44 HD wallet architecture On-device key generation, encrypted storage and local transaction signing Android Keystore / iOS Keychain integration PIN + biometric authentication WalletConnect/dApp connectivity and in-app Web3 browser Secure transaction history, balances and network handling Clean modular architecture for future chains/features Testing, security review, documentation and maintenance guide I’ll first validate your custom blockchain specifications, RPC/node compatibility and required transaction/signing model before finalizing the implementation plan. Estimated timeline: 12–18 weeks I can share relevant blockchain/mobile work during discussion without claiming projects I cannot substantiate. Mohit

@drishinfotech

Hi there, We’ve carefully reviewed your requirements and understand the core challenge ✅ — building a genuinely non-custodial wallet where private keys never leave the device, while supporting multiple chains plus your custom blockchain. ✨ This requires careful wallet architecture, secure key handling, local transaction signing, and reliable RPC/network integration rather than simply building a crypto UI. With over 25+ years of experience in software development and testing, our mobile team can build ⚡ the Android/iOS wallet foundation with HD wallet management, secure device storage, biometric/PIN protection, multi-chain transactions, custom RPC integration, WalletConnect/dApp connectivity, and a maintainable architecture for future chains. Deliveries: Android & iOS app • HD wallet/seed management • Secure key storage • Multi-chain integration • Custom blockchain integration • Local transaction signing • dApp/WalletConnect support • Security testing • Documentation Portfolio: Our Portfolio We’d first validate your custom blockchain specifications and transaction/signing model before finalizing the implementation plan and estimates.

@abhishek060

The difficult part here isn’t supporting a list of chains—it’s keeping one non-custodial security model correct across EVM, Bitcoin, Solana and your custom network. I’d use Flutter for the mobile layer, with wallet/key operations isolated behind a dedicated wallet engine. Private keys would remain device-only, encrypted through platform secure storage, with transaction signing performed locally. For existing chains, I’d rely on established wallet/crypto libraries rather than implementing cryptography ourselves. Your custom blockchain would be integrated as its own chain adapter covering derivation, address format, transaction construction/serialization, signing and RPC broadcasting. I’d validate those rules against the chain specification before locking the architecture. The dApp layer would also be designed so connection and transaction requests never bypass explicit local signing. One key question: does your custom chain already define its BIP-44 derivation/coin type and signing format? Also, is WalletConnect required alongside the embedded dApp browser? If you share the custom-chain technical specification, I can assess the integration path and milestones.

@UzeeTech

Hello, I can build a security-first, non-custodial multichain wallet for Android/iOS, choosing React Native or Flutter after confirming performance requirements. Implementation plan: • BIP32/39/44 HD wallet, device-only key generation, Android Keystore/iOS Keychain, biometric/PIN lock • Ethereum, BSC, Bitcoin, Solana and other required networks through modular chain adapters, plus your custom node/RPC and native coin • Offline signing, balances/history, deep links and WalletConnect/DApp browser • Secure signing/validation, threat-focused tests, clean documented code, CI builds and handover I have 9 years’ full-stack experience with React.js, Node.js, Python, Flutter and AI/ML; my mobile/API and security-focused integration experience fits this architecture. I can share relevant SDK work privately. Which networks are required for v1, and are the custom RPC endpoints and signing/transaction specifications ready?

@utamshingala

Hi, I can build your secure, non-custodial multichain wallet for iOS and Android using React Native, with local key generation/storage, HD wallets, biometric/PIN security, transaction signing, WalletConnect/dApp support, and custom blockchain integration. I understand that wallet security and clean architecture are critical here, and I can deliver a maintainable, well-documented codebase ready for future features. Best, Utam

@jorginhoo1

Hi, this looks like a serious wallet build, especially the custom-chain and non-custodial parts. I’ve worked across mobile apps, blockchain integrations, APIs and security-focused backend/frontend systems, and I’m comfortable working with React Native/Flutter and blockchain SDKs. For this, I’d keep the architecture clean from day one: HD wallet/seed management, secure key storage through Keychain/Keystore, fully local transaction signing, biometric/PIN protection, multi-chain address handling, WalletConnect/dApp integration, and a proper layer for your custom blockchain so it can be extended later without rewriting the wallet. One thing about the previous work samples: Freelancer doesn’t allow moving the conversation to external platforms just to share private project links/GitHub. Some of my previous work is also under client confidentiality, so I can’t publicly share everything here. If we move forward and the project is awarded, I can share relevant samples/code where I have permission from the respective clients. I’d also be happy to review your custom blockchain/RPC specifications first and then give you a realistic timeline and milestone plan. Thanks, and looking forward to discussing it.