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TronLink Provider API: Connecting Browser Wallet and Web3 DApps

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What is the Injected Provider API?

The Injected Provider API is a JavaScript interface that allows decentralized applications (DApps) to interact with users’ TronLink browser extension wallets. This powerful API enables your DApp to:

  • Request access to user accounts
  • Read data from connected blockchains
  • Facilitate message and transaction signing
  • Execute smart contract interactions

👉 Explore advanced wallet integration techniques

Connecting User Accounts

Authorization Request Method

javascript
window.okxwallet.tronLink.request(args)

Key Features

  • Initiates secure connection between DApp and wallet
  • Required before performing any transactions or signatures
  • User must explicitly approve the connection

Status Codes

Code Description Message
200 Pre-approved site The site is already in the whitelist
200 User approved User allowed the request
4000 Pending request Authorization requests being processed
4001 User rejected User rejected the request

TRX Transfer Process

  1. Create transaction – Prepare unsigned transfer
  2. Sign transaction – User approval via TronLink
  3. Broadcast transaction – Submit to TRON network

👉 See live code implementation

Transaction Signing

Signing Method

javascript
okxwallet.tronLink.tronWeb.trx.sign(transaction, privateKey)

Step 1: Creating Transactions

sendTRX Parameters

Parameter Description Type
to Recipient address hexString
amount TRX quantity integer
from Sender address (optional) hexString
options Permission ID integer

Step 2: Signing Transactions

Security Note: Never expose private keys in web applications

Sign Parameters

Parameter Description Type
transaction Transaction object JSON
privateKey Signing key (optional) String

Step 3: Broadcasting Transactions

sendRawTransaction Parameters

Parameter Description Type
signedTransaction Signed transaction object JSON

Message Signing

Signature Method

javascript
window.okxwallet.tronLink.tronWeb.trx.sign(message)

Version Compatibility

  • Pre-2.80.0: Always converts to hexadecimal
  • 2.80.0+: Maintains original format (hex or string)

Parameters

Parameter Description Type
message String (hex or plaintext) String

Return Values

  • Successful signing returns hexadecimal string
  • Errors return specific rejection messages

Signature Verification

Verification Method

javascript
window.okxwallet.tronLink.tronWeb.trx.verifyMessage(hexMsg, signedMsg[, address])

Parameters

Parameter Description Type
hexMsg Hexadecimal message String
signedMsg Signature result String
address Verifying address (optional) String

Return Value

Promise resolving to boolean (true/false)

Wallet Events

Connection Events

  • Connect: User approves connection or wallet connects
  • Disconnect: User rejects or disconnects wallet
  • Account Change: Login, switch, or lock events

Event Handling Examples

“`javascript
window.okxwallet.tronLink.on(‘connect’, (data) => {
console.log(‘Wallet connected:’, data)
})

window.okxwallet.tronLink.on(‘disconnect’, () => {
console.log(‘Wallet disconnected’)
})
“`

Frequently Asked Questions

How secure is the Injected Provider API?

The API maintains high security standards by:
– Requiring explicit user consent for all actions
– Never exposing private keys to DApps
– Implementing strict permission systems

What browsers support TronLink integration?

TronLink works on all Chromium-based browsers (Chrome, Brave, Edge) and Firefox. Mobile support varies by wallet implementation.

Can I use this API with other TRON wallets?

While designed for TronLink, the API follows common standards that may work with compatible wallets. Always test alternative implementations.

How do I handle failed transactions?

Implement comprehensive error handling:
javascript
try {
const result = await window.okxwallet.tronLink.request(...)
} catch (error) {
console.error('Transaction failed:', error)
}

What’s the difference between sign() and verifyMessage()?

  • sign() creates cryptographic signatures
  • verifyMessage() validates existing signatures
  • Both are essential for secure authentication flows

How often should I check connection status?

We recommend:
– Checking on initial page load
– Monitoring disconnect events
– Verifying before critical transactions

For developers building on TRON, understanding these wallet integration techniques is crucial for creating seamless Web3 experiences. The TronLink Provider API offers powerful capabilities while maintaining strong security protections for end users.

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