This tutorial guides you through adding cryptographically verified Web3 addresses to Flarum user profiles. It builds upon a previous tutorial (not included here) that introduced adding a custom field. This enhanced functionality ensures users can only add addresses they genuinely own.

Key Improvements:

• Cryptographic Verification: Users prove address ownership by signing a message with their private key. This prevents the input of arbitrary addresses.
• Polkadot JS Extension Integration: The extension interacts with the Polkadot JS browser extension for account selection and signature verification.
• Client-Side and Server-Side Validation: JavaScript handles user interaction and signature capture. A server-side Node.js script (callable from PHP) further validates the signature, ensuring security.
• Enhanced User Experience: A dropdown menu simplifies account selection. Clear error messages guide users through the process.
• Foundation for Future Features: This integration paves the way for features like cryptocurrency token rewards for forum participation.

Implementation Details:

The tutorial details the creation of a Web3Dropdown component (using Flarum's Dropdown component) which replaces the previous manual input field. It uses the @polkadot/extension-dapp, @polkadot/util-crypto, and @polkadot/util libraries for Web3 interaction and cryptographic operations.

The handleClick function requests permission to access the Polkadot JS extension, retrieves accounts, and presents them in a dropdown. Selecting an account triggers handleAccountSelect, which prompts the user to sign the message "Extreme ownership" using the selected account's private key. The signature is then sent to the server for verification.

A server-side Node.js script (verify.js) uses @polkadot/util-crypto to verify the signature. The PHP code (SaveUserWeb3Address.php) calls this script and handles the result, throwing a ValidationException if verification fails. The tutorial also addresses pre-deployment considerations, including bundling the Node.js script for production environments using Browserify.

Conclusion:

This extension provides a secure and user-friendly way to integrate Web3 addresses into Flarum, laying the groundwork for future features leveraging blockchain technology. The complete extension is available at [swader/web3address](placeholder - replace with actual link if available). The tutorial also includes a FAQ section addressing common questions about Web3 addresses and their usage within the Flarum context.

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