Custom Multi-Chain Crypto Wallet Development for ScratchApp

2500+

hours of development

$85K

Project Budget

person expert team

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Challenge

The client planned to enter the Colombian market with a product designed to make cryptocurrency services accessible to everyday users. Their goal was to launch a mobile wallet that would serve as the foundation of their ecosystem, allowing users to securely store digital assets, exchange tokens, and purchase crypto using local fiat payment methods. However, existing wallet solutions did not support their expansion strategy. Most available products were limited to single blockchain networks or lacked flexibility for banking integrations and cross-chain functionality. The client needed a scalable, user-friendly wallet that could support multiple blockchain ecosystems while building trust and enabling long-term growth in a new financial market.

Industry Web3

Location Colombia

Cooperation Period February 2025 – October 2025

Deeper Look

We built a robust mobile crypto wallet with a powerful backend infrastructure

MULTI-CHAIN BLOCKCHAIN INTEGRATION

To support the client’s expansion strategy, OmiSoft implemented a unified blockchain interaction layer capable of working with multiple networks simultaneously. The wallet integrates with Ethereum, Polygon, Binance Smart Chain, Base, Arbitrum, Optimism, Avalanche C-Chain, Solana, and TRON. Each blockchain network operates using different transaction validation rules and cryptographic models. To address this complexity, OmiSoft built network-specific adapters that standardize communication between the application and each blockchain protocol while preserving their unique technical requirements. The system also includes automatic RPC failover, which allows the wallet to switch between blockchain node providers in case of connectivity issues. This approach improves transaction reliability and reduces the risk of failed operations during periods of network instability.

NON-CUSTODIAL SECURITY ARCHITECTURE

Security was implemented as a core product principle. The wallet follows a fully non-custodial model, meaning users retain full control over their private keys and recovery phrases. All transactions are signed locally on the user’s device, eliminating risks associated with centralized custody. The application uses AES-256-GCM encryption combined with PBKDF2 key derivation to protect sensitive wallet data. A layered encryption model ensures that private keys are decrypted only when required and remain protected even if unauthorized device access occurs. The wallet integrates with device-level secure storage systems, using Apple Keychain on iOS and Android Keystore with encrypted shared preferences. Biometric authentication, including Face ID, Touch ID, and fingerprint verification, was implemented to provide secure and convenient access to wallet functionality. Additional protection mechanisms include brute-force prevention, screenshot blocking for recovery phrase screens, and automatic memory cleanup after transaction signing. These measures strengthen user trust and support compliance with modern mobile security best practices.

HD WALLET AND ACCOUNT MANAGEMENT

The wallet uses hierarchical deterministic architecture based on industry BIP standards. This allows users to manage multiple blockchain accounts using a single recovery phrase while maintaining secure account isolation. The system supports multi-wallet management, account discovery, and flexible account switching, improving usability for users managing diverse digital asset portfolios.

TRANSACTION RELIABILITY ENGINE

To improve transaction accuracy and reduce user friction, OmiSoft implemented a structured transaction lifecycle management system. Every transaction follows a consistent pipeline that includes creation, validation, signing, broadcasting, and confirmation monitoring. The wallet performs network-specific validation processes to ensure transaction accuracy. For EVM networks, the system manages gas estimation, nonce tracking, and token validation. Solana transactions include rent exemption and token account verification, while TRON transactions include bandwidth and energy resource checks. The application continuously monitors transaction statuses in both background and foreground modes, providing users with real-time updates and maintaining transaction history even during temporary connectivity issues.

FIAT ON-RAMP AND OFF-RAMP INTEGRATION

To support market adoption in Colombia, the wallet integrates with third-party payment providers and banking APIs that allow users to purchase cryptocurrency using local fiat payment methods and convert digital assets back into traditional currency. This functionality reduces reliance on external exchanges and simplifies onboarding for first-time crypto users, supporting the client’s growth strategy in emerging financial markets.

TOKEN SWAP AND CROSS-CHAIN BRIDGING

The wallet includes built-in decentralized finance functionality that allows users to perform token swaps within a single blockchain network as well as bridge assets between different blockchain ecosystems. Exchange rates are updated in real time, and users can track transaction progress directly within the application. This feature allows users to manage digital assets without relying on external DeFi platforms, improving convenience and increasing product retention.

CLOUD BACKUP AND RECOVERY

The application provides optional encrypted cloud backup functionality while maintaining a non-custodial security model. Backup data is encrypted locally before being uploaded to iCloud or Google Drive. The system uses a separate cloud password, preventing wallet data exposure even if cloud credentials are compromised. Users can selectively restore wallets and manage multiple backup versions, improving data recovery flexibility.

USER EXPERIENCE DESIGN

The wallet was designed to simplify blockchain interactions through intuitive mobile workflows. The application automatically detects compatible blockchain networks when users enter recipient addresses and supports QR-based transfers for faster transactions. Users can manage contacts through an integrated address book that filters addresses based on network compatibility. The interface provides real-time transaction tracking, multi-wallet switching, and detailed error recovery flows, ensuring consistent usability across various network conditions.

PERFORMANCE AND SCALABILITY

To maintain stable performance across multiple blockchain networks, OmiSoft implemented parallel balance fetching and intelligent caching mechanisms. The system reduces unnecessary network requests while maintaining accurate price and transaction data. Provider caching and automatic RPC health monitoring improve blockchain connectivity stability. The wallet uses encrypted MMKV storage, which significantly improves mobile data performance. Offline-first synchronization ensures reliable application behavior even during network interruptions.

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Tech stack

Tech Stack used

React Native

Ethereum

Solana

Polygon

Arbitrum

Base

BSC

The delivered wallet enabled the client to successfully launch a secure and scalable cryptocurrency product tailored for the Colombian market. The application created a strong technological foundation for expanding digital financial services across Latin America while supporting multiple blockchain ecosystems within a single platform.

The solution simplified user onboarding through integrated fiat payment functionality and improved user trust through enterprise-level security architecture. The scalable multi-chain infrastructure allows the client to continuously expand blockchain integrations and introduce new decentralized financial services without rebuilding the product.

By combining reliability, accessibility, and advanced blockchain interoperability, the wallet positioned the client as a trusted bridge between traditional financial systems and decentralized finance, enabling new revenue opportunities and long-term ecosystem growth.