How to use WalletConnect to link your app to dApps?

Understanding WalletConnect Protocol

1. WalletConnect is an open-source protocol that enables secure communication between cryptocurrency wallets and decentralized applications without exposing private keys.

2. It operates via a relay server that forwards encrypted payloads between the dApp and wallet using a symmetric key established during pairing.

3. The pairing process generates a QR code or deep link containing a session proposal with metadata such as chain ID, required permissions, and app information.

4. Users scan the QR code with their mobile wallet or click the deep link to initiate connection approval on a trusted client interface.

5. Once approved, a persistent, end-to-end encrypted session is established, allowing signed transactions and wallet interactions across devices.

Integrating WalletConnect v2 SDK

1. Developers install the @walletconnect/modal package alongside @walletconnect/core and @walletconnect/sign-client for full compatibility with EVM and non-EVM chains.

2. A project ID must be obtained from the WalletConnect Cloud dashboard and passed during client initialization to enable analytics and relay routing.

3. The modal UI is initialized with optional theme options and supported wallets, enabling seamless user onboarding without custom UI development.

4. Session namespaces are configured to declare required chains, accounts, and methods — for example, eth_signTransaction or cosmos_signAmino.

5. Event listeners for connect, disconnect, and session_update are registered to handle state changes and update application UI accordingly.

Handling Wallet Requests in Real Time

1. When a dApp requests a transaction signature, it constructs a request object containing chain-specific parameters like transaction data, gas limits, and recipient addresses.

2. The request is sent through the active session using the request() method, triggering a prompt inside the connected wallet interface.

3. Wallets return either a success response with a signed transaction or a rejection error, both of which must be handled gracefully by the dApp logic.

4. For batch operations, multiple requests can be queued but must respect session-level rate limiting and timeout thresholds imposed by the relay network.

5. Pending requests are tracked via unique IDs, and responses are matched using the same ID to prevent race conditions during concurrent wallet interactions.

Security Considerations and Best Practices

1. Never store session keys client-side; rely on WalletConnect’s built-in persistence layer or use secure storage mechanisms compliant with platform-specific guidelines.

2. Validate all incoming session proposals against known dApp origins and enforce strict domain allowlists to mitigate phishing attempts.

3. Reject sessions that request excessive permissions, such as access to all accounts or unrestricted signing capabilities, unless explicitly justified by app functionality.

4. Implement timeout handling for pending requests exceeding 120 seconds to avoid indefinite hanging states during wallet unresponsiveness.

5. Audit all relay endpoints used in production environments and prefer self-hosted relays where compliance requirements mandate full control over message routing infrastructure.

Frequently Asked Questions

Q: Can WalletConnect be used with hardware wallets?Yes, several hardware wallet providers including Ledger and Trezor offer WalletConnect-compatible apps that support session establishment and signing via Bluetooth or USB interfaces.

Q: What happens if the relay server goes offline?Sessions remain active because encryption keys are held locally; only new session proposals and notifications require relay availability. Existing connections continue functioning until manually terminated.

Q: Is WalletConnect compatible with Solana dApps?Yes, WalletConnect v2 supports Solana through namespace configuration specifying solana: namespace and corresponding methods like solana_signTransaction and solana_signMessage.

Q: Do users need to re-pair every time they visit a dApp?No, sessions persist across browser restarts if local storage is preserved. Users may choose to disconnect manually or revoke access via wallet settings at any time.