Relay: A Decentralized Encrypted Messaging dApp

Introduction

Welcome to Relay, a decentralized messaging dApp built on the Solana blockchain. In the era of Web3, our goal is to provide a secure and censorship-resistant platform for communication. With Relay, you can send encrypted messages without worrying about central authorities intercepting, leaking, or blocking your communication.

Features

• End-to-End Encryption: Messages are encrypted using your private key and the recipient's public key. This ensures that only the intended recipient can decrypt and read the message.
• Decentralization: Hosted on the Solana blockchain, Relay eliminates the risk of central control or shutdown.
• Privacy and Security: No central authority can access or tamper with your messages.

Use Cases

• Anonymous Communication: Relay allows for secure and anonymous communication, protecting user identity.
• Resistant to Censorship: Messages cannot be blocked or censored by any central authority.
• Data Integrity: Ensures that the message data remains unchanged and secure.

Technology Stack

• Solana Blockchain: Ensures decentralized hosting and high transaction throughput.
• TweetNaCl: Utilized for encrypting messages. It provides cryptographic functions to ensure data security.
• Web3.js: Used to connect to the Solana network and interact with smart contracts.
• Phantom Wallet: Integrated for managing user wallets and signing transactions.
• Anchor Framework: Simplifies Solana program development and deployment.

Encryption Process

Relay uses TweetNaCl for encryption:

• Encryption: The sender's private key and the recipient's public key encrypt the message.
• Decryption: The recipient's private key and the sender's public key decrypt the message. This ensures that only the intended recipient can read the message, providing robust security.

UI Architecture

Relay's front-end is built with React, leveraging various libraries for a seamless user experience:

• React Query: Manages data fetching and caching.
• React Hot Toast: Provides user notifications.
• Solana Wallet Adapter: Integrates Phantom Wallet for user authentication.
• Tailwind CSS: For styling components.

Example Imports

javascriptCopy codeimport { useWallet } from '@solana/wallet-adapter-react';
import { LAMPORTS_PER_SOL, PublicKey } from '@solana/web3.js';
import { useQueryClient } from '@tanstack/react-query';
import { useConnection } from '@solana/wallet-adapter-react';
import { TOKEN_2022_PROGRAM_ID } from '@solana/spl-token';
import { Connection, SystemProgram, VersionedTransaction } from '@solana/web3.js';
import { useMutation, useQuery } from '@tanstack/react-query';
import toast from 'react-hot-toast';
import { useTransactionToast } from '../ui/ui-layout';

Anchor and Smart Contracts

Relay uses the Anchor framework for Solana smart contract development. Here's a brief overview of our lib.rs:

rustCopy codeuse anchor_lang::prelude::*;

#[program]
pub mod relay {
    use super::*;
    pub fn send_message(ctx: Context<SendMessage>, message: String) -> ProgramResult {
        let message_account = &mut ctx.accounts.message_account;
        message_account.message = message;
        Ok(())
    }
}

#[account]
pub struct MessageAccount {
    pub message: String,
}

Deployment

Relay is hosted on Vercel and accessible at: Relay dApp

Conclusion

Relay provides a secure, decentralized platform for encrypted messaging, ensuring privacy and freedom from central control. Join us in embracing the Web3 revolution and enjoy secure communication with Relay.