A Developer's Guide to OKX Bitcoin SDK Integration

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Introduction to the OKX Bitcoin SDK

The OKX Bitcoin SDK provides a powerful set of tools for developers looking to integrate Bitcoin and Bitcoin-compatible chain functionality into their decentralized applications. This comprehensive solution enables seamless wallet connections, transaction processing, and secure signing operations through a well-documented API interface.

By implementing this SDK, developers can offer users a streamlined experience for managing Bitcoin assets, signing transactions, and interacting with various Bitcoin-based protocols. The SDK supports multiple namespace configurations, including both EVM-compatible chains and native Bitcoin implementations.

Installation and Initialization

To begin integrating OKX Connect into your DApp, ensure you're using version 6.92.0 or later. The installation process is straightforward using npm package management.

Before establishing wallet connections, you must first create a provider object that will handle all subsequent operations including wallet linking, transaction signing, and message transmission.

Request Parameters

Return Value

Implementation Example

// Example initialization code
const provider = new OKXUniversalProvider({
  dappMetaData: {
    name: "Your DApp Name",
    icon: "https://yourdomain.com/icon.png"
  }
});

Connecting to Wallets

Establishing wallet connections is fundamental for obtaining wallet addresses, which serve as essential identifiers and are required for signing transactions.

okxUniversalProvider.connect(connectParams: ConnectParams);

Request Parameters

Return Value

Implementation Example

// Example connection code
try {
  const session = await provider.connect({
    namespaces: {
      btc: {
        chains: ["btc:mainnet"],
        methods: ["signPsbt", "sendBitcoin"],
        events: ["accountsChanged"]
      }
    }
  });
  console.log("Connected successfully:", session.accounts);
} catch (error) {
  console.error("Connection failed:", error);
}

Checking Wallet Connection Status

Determining whether a wallet is currently connected is essential for managing application state and user experience.

Return Value

Implementation Example

// Check connection status
const isConnected = provider.isConnected();
if (isConnected) {
  // Proceed with authenticated operations
} else {
  // Prompt user to connect wallet
}

Transaction Preparation

Before executing transactions, you need to create an OKXBtcProvider object by passing your OKXUniversalProvider instance to the constructor. This specialized provider handles Bitcoin-specific operations and transaction formatting.

// Create Bitcoin provider
const btcProvider = new OKXBtcProvider(provider);

Retrieving Account Information

Fetching account details is crucial for displaying user-specific data and preparing transaction parameters.

Request Parameters

Return Value

Implementation Example

// Get account information
const accountInfo = await btcProvider.getAccount("btc:mainnet");
console.log("Address:", accountInfo.address);
console.log("Public Key:", accountInfo.publicKey);

Message Signing

Digital signatures provide authentication and verification for various operations within the Bitcoin ecosystem.

Request Parameters

Return Value

Implementation Example

// Sign a message
const signature = await btcProvider.sign("btc:mainnet", "Hello, Bitcoin!", "ecdsa");
console.log("Signature:", signature);

Sending Bitcoin Transactions

Transferring Bitcoin between addresses represents a core functionality for most financial applications.

Request Parameters

Return Value

Implementation Example

// Send Bitcoin transaction
const txHash = await btcProvider.sendBitcoin(
  "btc:mainnet",
  "recipient_address_here",
  10000, // 0.0001 BTC
  { feeRate: 15 } // Optional custom fee rate
);
console.log("Transaction Hash:", txHash);

PSBT Signing (Partially Signed Bitcoin Transactions)

PSBT signing enables complex transaction construction with multiple participants and conditions.

Request Parameters

Return Value

Implementation Example

// Sign a PSBT
const signedPsbt = await btcProvider.signPsbt(
  "btc:mainnet",
  "psbt_hex_string_here",
  {
    autoFinalized: true,
    toSignInputs: [
      {
        index: 0,
        address: "signing_address_here",
        publicKey: "public_key_here"
      }
    ]
  }
);

Multiple PSBT Signing

Batch processing of multiple PSBTs improves efficiency for applications handling numerous transactions simultaneously.

Request Parameters

Return Value

Implementation Example

// Sign multiple PSBTs
const signedPsbts = await btcProvider.signPsbts(
  "btc:mainnet",
  ["psbt1_hex", "psbt2_hex"],
  [
    {
      autoFinalized: true,
      toSignInputs: [{ index: 0, address: "address1", publicKey: "pubkey1" }]
    },
    {
      autoFinalized: true,
      toSignInputs: [{ index: 0, address: "address2", publicKey: "pubkey2" }]
    }
  ]
);

Signing and Broadcasting PSBT Transactions

This combined operation streamlines the process of finalizing transactions and submitting them to the network.

App required: >= 6.93.0

Request Parameters

Return Value

Implementation Example

// Sign and broadcast PSBT
const result = await btcProvider.signAndPushPsbt(
  "btc:mainnet",
  "psbt_hex_string_here",
  {
    autoFinalized: true,
    toSignInputs: [
      {
        index: 0,
        address: "signing_address_here",
        publicKey: "public_key_here"
      }
    ]
  }
);
console.log("Transaction Hash:", result.txhash);

Disconnecting Wallets

Properly disconnecting wallets ensures clean session termination and is particularly important when switching between different wallet connections.

// Disconnect wallet
await provider.disconnect();

Event Handling

The SDK provides various events that allow your application to respond to state changes, connection updates, and transaction status modifications. Implementing event listeners enhances user experience by providing real-time feedback.

Common events include:

Error Codes and Handling

Understanding potential errors during connection, transaction processing, and disconnection procedures is essential for building robust applications.

Common Exceptions

Error CodeDescription
OKX_CONNECT_ERROR_CODES.UNKNOWN_ERRORUnknown or unexpected error
OKX_CONNECT_ERROR_CODES.ALREADY_CONNECTED_ERRORWallet already connected
OKX_CONNECT_ERROR_CODES.NOT_CONNECTED_ERRORWallet not connected
OKX_CONNECT_ERROR_CODES.USER_REJECTS_ERRORUser rejected the operation
OKX_CONNECT_ERROR_CODES.METHOD_NOT_SUPPORTEDRequested method not supported
OKX_CONNECT_ERROR_CODES.CHAIN_NOT_SUPPORTEDRequested chain not supported
OKX_CONNECT_ERROR_CODES.WALLET_NOT_SUPPORTEDWallet not supported
OKX_CONNECT_ERROR_CODES.CONNECTION_ERRORConnection-related issue

Implement proper error handling to ensure graceful degradation and user-friendly error messages.

// Example error handling
try {
  await provider.connect(connectParams);
} catch (error) {
  switch (error.code) {
    case OKX_CONNECT_ERROR_CODES.USER_REJECTS_ERROR:
      console.log("User rejected connection request");
      break;
    case OKX_CONNECT_ERROR_CODES.CHAIN_NOT_SUPPORTED:
      console.log("Requested chain not supported");
      break;
    default:
      console.log("Connection failed:", error.message);
  }
}

Best Practices for Implementation

When integrating the OKX Bitcoin SDK, consider these best practices:

  1. User Experience: Always provide clear feedback during connection attempts and transaction processing
  2. Error Handling: Implement comprehensive error handling with user-friendly messages
  3. State Management: Properly manage connection state across application sessions
  4. Security: Validate all responses and implement appropriate security measures
  5. Testing: Thoroughly test all functionality across different network conditions

👉 Explore advanced integration techniques

Frequently Asked Questions

What is the minimum supported version for OKX Connect integration?
You need to ensure you're using at least version 6.92.0 of the OKX SDK to access all Bitcoin-related functionality. Earlier versions may lack support for certain Bitcoin operations or have limited compatibility with newer wallet features.

How do I handle different Bitcoin network types (mainnet vs testnet)?
The SDK supports both mainnet and testnet environments through proper chain identification. Use "btc:mainnet" for production environments and the appropriate testnet identifier for development and testing purposes to avoid accidental real transactions during development.

What image formats are supported for the application icon?
The SDK supports PNG, ICO, and other standard image formats, but specifically excludes SVG icons. For optimal display quality, provide a 180x180px PNG image URL that will be displayed consistently across different wallet interfaces and devices.

Can I customize the fee rate for Bitcoin transactions?
Yes, the SDK allows optional custom fee rate specification through the options parameter when sending Bitcoin transactions. This enables applications to balance between transaction confirmation speed and cost according to user preferences and network conditions.

How does PSBT signing differ from regular transaction signing?
PSBT (Partially Signed Bitcoin Transaction) format enables more complex transaction scenarios involving multiple parties and conditional signing. It's particularly useful for multisig wallets, coinjoin transactions, and other advanced Bitcoin protocols that require collaborative transaction construction.

What should I do if a user rejects a connection request?
Your application should gracefully handle rejection by providing clear feedback and potentially offering alternative connection methods or explaining why wallet connection is necessary for specific features. Avoid blocking essential application functionality behind mandatory wallet connections when possible.