Modern blockchain development demands reliable, secure, and easy-to-integrate tools. The JavaScript Wallet SDK is a powerful TypeScript/JavaScript-based solution designed to streamline wallet integration across multiple blockchains. Whether you're building decentralized applications (dApps), exchanges, or custodial solutions, this SDK provides essential cryptographic functions, transaction signing, address generation, and cross-chain compatibility—all in a modular, lightweight package.
Built with developers in mind, the SDK supports a wide range of public chains and offers consistent APIs across different ecosystems. It enables offline operations such as private key management, transaction assembly, and message signing—critical features for ensuring user security and privacy.
Key Features of the JavaScript Wallet SDK
The SDK is structured into modular components that support various blockchain families. Each module follows standardized interfaces while accommodating chain-specific logic where necessary.
Modular Architecture
The SDK uses a clean separation of concerns:
coin-base: Core wallet functionality shared across all blockchains.crypto-lib: Cryptographic utilities including BIP32, BIP39, ECDSA, Ed25519, hashing, and encoding.coin-*modules: Chain-specific implementations (e.g.,coin-ethereum,coin-bitcoin,coin-solana).
This modularity allows developers to import only what they need, reducing bundle size and improving performance.
Cross-Chain Support
From Bitcoin and Ethereum to emerging ecosystems like Solana, Sui, and Aptos, the SDK delivers unified tooling across:
- EVM-compatible chains (Ethereum, Polygon, Arbitrum, Optimism)
- Cosmos ecosystem (Atom, Juno, Osmosis)
- Layer 2 solutions (zkSync, Starknet)
- High-performance networks (Solana, Sui, Near)
Developers can use the same patterns and method names across chains, significantly reducing learning curves and integration time.
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Installation & Setup
You can install the SDK via npm or build it locally from source.
Using npm (Recommended)
Install the core base package for universal wallet functions:
npm install @okxweb3/coin-baseThen add specific chain modules as needed:
# For Ethereum and EVM chains
npm install @okxweb3/coin-ethereum
# For Bitcoin and UTXO-based chains
npm install @okxweb3/coin-bitcoin
# For Solana
npm install @okxweb3/coin-solanaThis modular approach ensures minimal overhead and maximum flexibility.
Local Build (Advanced Use Cases)
For full control or customization:
Clone the repository:
git clone https://github.com/okx/js-wallet-sdk.gitNavigate to the project directory and run:
npm run build
This compiles all packages and generates distributable files under the dist/ folder.
Core Functionalities
Each coin-* module implements a common set of wallet operations with minor variations based on blockchain architecture.
Common Functions Across Chains
| Function | Purpose |
|---|---|
getRandomPrivateKey() | Generate a secure random private key |
getNewAddress() | Derive wallet address from a private key |
validAddress() | Validate if an address format is correct |
signTransaction() | Sign raw transactions securely |
signMessage() | Sign arbitrary messages for authentication |
verifyMessage() | Verify signed messages |
calcTxHash() | Compute transaction hash without broadcasting |
getDerivedPath() | Retrieve standard BIP44 derivation path |
These standardized methods simplify switching between chains during development or expansion.
Chain-Specific Capabilities
Some chains offer advanced features through extended APIs:
- Aptos: Supports NFT minting (
tokenMint), transfers, and dApp interactions. - Starknet & zkSync: Zero-knowledge proof-based signing with support for L2 data types like
changePubkey. - Solana: Hardware-integrated signing and full transaction lifecycle tools.
- Near: Includes account creation and full-access key generation.
- TRON: Comprehensive hardware wallet support with raw transaction inspection.
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Supported Blockchains
The SDK currently supports over 50 blockchain networks across major ecosystems:
Bitcoin Family (UTXO Model)
- BTC, BCH, BSV, LTC, DOGE
- Derivation paths include legacy (m/44'), P2SH-segwit (m/49'), native segwit (m/84'), and Taproot (m/86')
Ethereum & EVM Chains
- Mainnet, Goerli, Sepolia
- L2s: Arbitrum, Optimism, zkSync Era, Polygon zkEVM
- Sidechains: Avalanche C, Fantom, Celo, BNB Chain
Cosmos Ecosystem
- Atom, Osmosis, Juno, Secret Network
- Uses m/44'/118' path; Evmos uses Ethereum’s m/44'/60'
High-Performance Networks
- Solana: m/44'/501'
- Sui: m/44'/784'
- Aptos: m/44'/637'
- Near: Seed-based addressing with full access keys
Emerging Protocols
- Starknet, zkSync, ZKSpace — all support ZK-powered scaling
- TRON, EOS, Flow, Stacks, Polkadot
A complete list of supported derivation paths is maintained internally for deterministic wallet recovery.
Use Cases & Developer Benefits
1. Non-Custodial Wallet Development
Build self-custody wallets with offline signing capabilities. Users retain control of their keys at all times.
2. Exchange Backend Integration
Securely generate deposit addresses and sign withdrawals across multiple chains using a single codebase.
3. dApp Authentication
Leverage signMessage() for passwordless login flows—users sign a challenge to prove ownership.
4. Hardware Wallet Compatibility
Use getHardWareRawTransaction() and related methods to interface with hardware devices securely.
5. Cross-Chain Bridges
Standardized APIs make it easier to build bridges that validate inputs and sign outputs on different chains.
Frequently Asked Questions (FAQ)
Q: Can I use this SDK in browser-based applications?
A: Yes. The SDK is compatible with modern browsers and bundlers like Webpack or Vite. All cryptographic operations run client-side for enhanced security.
Q: Is private key storage handled by the SDK?
A: No. The SDK does not store private keys. It only provides tools for generating, deriving, and using them—ensuring full user control over key management.
Q: Does it support testnets?
A: Yes. Most coin-* modules support both mainnet and popular testnets (e.g., Sepolia for Ethereum, Testnet for Solana).
Q: How often is new chain support added?
A: The SDK is actively maintained with regular updates. New chains are added based on community demand and ecosystem growth.
Q: Are there usage limits or fees?
A: The SDK is open-source and free to use. There are no rate limits or licensing costs.
Q: Where can I find example code and tests?
A: Each module includes a tests directory in the GitHub repository with real-world usage examples and edge-case handling.
Why Choose This SDK?
In a fragmented blockchain landscape, having a consistent, well-documented toolset is invaluable. This JavaScript Wallet SDK stands out because it:
- Offers uniform APIs across diverse blockchains
- Prioritizes security-first design with offline signing
- Enables rapid integration via npm packages
- Supports future-proof protocols like ZK-Rollups and sharded architectures
Whether you're launching a wallet app or scaling an existing platform, this SDK reduces complexity and accelerates time-to-market.
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Final Thoughts
As blockchain adoption grows, so does the need for robust developer tooling. The JavaScript Wallet SDK delivers a scalable foundation for building secure, multi-chain applications with confidence. With strong community backing and continuous improvements, it's positioned as a go-to resource for modern web3 development.
By leveraging this SDK, developers gain access to battle-tested cryptographic functions and streamlined workflows—empowering innovation without compromising on security or usability.