The world of decentralized applications (DApps) is rapidly evolving, and seamless blockchain connectivity is at the heart of user engagement. The OKX Injected Provider API (Signet) empowers developers to integrate Bitcoin Signet functionality directly into web applications, enabling secure wallet connections, message signing, and transaction processing—all through a clean, JavaScript-based interface.
This guide dives deep into the core methods of the OKX Injected Provider API tailored for Bitcoin’s Signet test network. Whether you're building a decentralized exchange (DEX), a blockchain explorer, or a Web3-enabled tool, understanding how to leverage this API will accelerate your development workflow and enhance user experience.
What Is the Injected Provider API (Signet)?
The OKX Injected Provider API (Signet) is a JavaScript interface embedded within the OKX Wallet browser extension. It allows DApps to interact securely with users' wallets by requesting account information, reading data from the blockchain, and facilitating digital signatures for messages and transactions on the Bitcoin Signet network.
🔐 Security Note: This API operates in the context of the user's browser and only activates when the user explicitly grants permission. No private keys are ever exposed to the DApp.
📌 Prerequisite: To use BTC Signet features, ensure the OKX Wallet browser extension is version 2.82.32 or higher.
With this foundation in place, let’s explore the key methods available in the API.
Connect: Establishing Wallet Connectivity
👉 Discover how easy it is to connect your Web3 app to real user wallets in seconds.
To begin interacting with a user's wallet, your DApp must first establish a connection. The connect method initiates this secure handshake.
Method
okxwallet.bitcoinSignet.connect()Description
Requests permission to connect to the user's wallet and retrieve basic account details.
Parameters
None
Returns
A Promise that resolves to an object containing:
address(string): The connected Bitcoin Signet address.publicKey(string): The public key associated with the address.
Example Usage
try {
const result = await okxwallet.bitcoinSignet.connect();
console.log("Connected Address:", result.address);
console.log("Public Key:", result.publicKey);
} catch (error) {
console.error("Connection failed:", error);
}This method triggers a user consent prompt in the OKX Wallet UI—ensuring all interactions remain permissioned and secure.
signMessage: Securely Sign Arbitrary Data
Verifying user identity without exposing sensitive data is crucial in Web3. The signMessage method allows users to sign arbitrary strings using their private key, providing cryptographic proof of ownership.
Method
okxwallet.bitcoinSignet.signMessage(signStr[, type])Description
Generates a digital signature for a given message string.
Parameters
signStr(string): The message to be signed.type(string, optional): Signature algorithm. Supported values:"ecdsa"or"bip322-simple". Defaults to"ecdsa".
💡 Use "bip322-simple" for improved compatibility with modern Bitcoin signing standards.Returns
A Promise resolving to a signed string (hex-encoded).
Example
const signature = await okxwallet.bitcoinSignet.signMessage("Hello, Web3!", "bip322-simple");
console.log("Signature:", signature);This feature is ideal for login authentication, challenge-response systems, or non-repudiation protocols.
signPsbt: Sign a Single PSBT Transaction
When building transaction logic into your DApp, Partially Signed Bitcoin Transactions (PSBTs) offer flexibility and security. The signPsbt method enables users to sign a single PSBT within their wallet interface.
Method
okxwallet.bitcoinSignet.signPsbt(psbtHex[, options])Description
Signs a provided PSBT hex string. The wallet automatically identifies inputs linked to the connected address and signs them accordingly.
Parameters
psbtHex(string): Hex-encoded PSBT data.options(object, optional):autoFinalized(boolean): Automatically finalize the PSBT after signing. Default:true.toSignInputs(array): Specify which inputs to sign if custom control is needed.index(number): Input index.address(string): Corresponding address.publicKey(string): Required for Taproot inputs.sighashTypes(number[]): Optional sighash flags.disableTweakSigner(boolean): Use raw private key instead of tweaked signer for Taproot. Default:false.
⚠️ For Taproot addresses, always provide the corresponding publicKey during PSBT construction.Returns
A Promise resolving to a signed PSBT hex string.
Example
const signedPsbt = await okxwallet.bitcoinSignet.signPsbt("76a914...", {
autoFinalized: true,
toSignInputs: [{
index: 0,
address: "tb1p...",
publicKey: "02aabbcc..."
}]
});👉 See how top DEX platforms streamline transaction signing with integrated Web3 APIs.
signPsbts: Batch Signing Multiple PSBTs
For advanced use cases like batch trading or multi-swap operations, signing multiple transactions efficiently becomes essential.
Method
okxwallet.bitcoinSignet.signPsbts(psbtHexs[, options])Description
Signs multiple PSBTs in one request. Each PSBT is processed independently but presented in a unified approval flow.
Parameters
psbtHexs(string[]): Array of hex-encoded PSBTs.options(object[]): Optional configuration per PSBT:autoFinalized(boolean)toSignInputs(array): As defined above
Returns
A Promise resolving to an array of signed PSBT hex strings.
Example
const signedPsbts = await okxwallet.bitcoinSignet.signPsbts([
"76a914...",
"c0ffee..."
], [
{ autoFinalized: true },
{ autoFinalized: false }
]);This method significantly improves UX by reducing repeated confirmation prompts across related transactions.
Core Keywords for SEO Optimization
To align with search intent and improve visibility, the following core keywords are naturally integrated throughout this article:
- Bitcoin Signet API
- Web3 wallet integration
- DEX API documentation
- Browser plugin wallet
- PSBT signing
- Injected provider API
- OKX Wallet API
- Sign message Bitcoin
These terms reflect common developer queries around testnet development, wallet connectivity, and secure transaction handling on Bitcoin layers.
Frequently Asked Questions
Q: What is Bitcoin Signet used for?
A: Bitcoin Signet is a scalable test network that provides reliable and fast transaction confirmation for developers testing Bitcoin applications before deploying on mainnet.
Q: Can I use this API on mainnet?
A: This guide focuses on the Signet version of the API. A separate mainnet endpoint may be available depending on OKX Wallet updates—always verify environment compatibility.
Q: Do users need to install anything?
A: Yes, users must have the OKX Wallet browser extension installed and updated to version 2.82.32+ to access Signet features.
Q: Is user private key exposed during signing?
A: No. All cryptographic operations occur securely within the wallet extension. Private keys never leave the user’s device.
Q: How does bip322-simple differ from ECDSA?
A: BIP322 allows signing of arbitrary messages using script semantics, offering broader compatibility than traditional ECDSA, especially for complex address types like Taproot.
Q: Can I customize the signing experience?
A: While UI customization is limited, you can control technical parameters like sighash types and input selection via the options object in signing methods.
👉 Start integrating powerful Web3 capabilities into your next-gen DApp today.
By leveraging the OKX Injected Provider API (Signet), developers gain robust tools to build secure, efficient, and user-friendly Bitcoin-based applications. From simple logins to complex multi-transaction workflows, this API streamlines Web3 integration while maintaining strict security standards.