Most chat apps store messages on company servers, risking privacy, censorship, and security breaches. This project is a decentralized chat app on blockchain, ensuring private, secure, and censorship-free communication where users fully control their data.✨

Problem Statement

In today’s digital age, privacy and security in communication are increasingly under threat. Centralized messaging platforms often compromise user data, lack transparency, and are vulnerable to censorship and data breaches. Users are left with limited control over their conversations, and sensitive information can be exposed to third parties. This lack of trust and transparency in communication platforms undermines user confidence and restricts the potential for secure, decentralized interactions.

Solution

NexusChat is a blockchain-powered messaging platform built using the Calimero SDK, designed to redefine secure and private communication. By leveraging decentralized technology, NexusChat ensures that messages are encrypted, tamper-proof, and fully transparent, while giving users complete control over their data. Whether it’s text-based chats or real-time voice communication, NexusChat provides a secure, efficient, and decentralized alternative to traditional messaging apps. With features like password-protected rooms, on-chain message storage, and peer-to-peer voice signaling, NexusChat empowers users to communicate freely without compromising their privacy.

Target Audience

NexusChat is designed for individuals and organizations that prioritize privacy, security, and transparency in their communication. It is ideal for:

• • • Tech-savvy users and blockchain enthusiasts.
    • Businesses seeking a decentralized messaging solution.
    • Communities and groups requiring secure, encrypted communication channels (e.g., remote teams, activists, privacy-conscious individuals).

How NexusChat Transforms Communication

NexusChat addresses the growing need for secure, private, and transparent communication by leveraging blockchain technology. Unlike centralized messaging platforms, NexusChat eliminates the risk of data breaches, censorship, and third-party interference. By storing messages on-chain and encrypting communications, NexusChat ensures that users have full control over their data while maintaining transparency and trust.

With features like password-protected rooms, decentralized user management, and real-time voice communication, NexusChat empowers users to communicate freely and securely. Whether for personal use, business collaboration, or community engagement, NexusChat is the future of decentralized messaging, bridging the gap between privacy and transparency in the digital world.

Contract Functions

User Functions

• • • Register a new user.
    • Retrieve wallet addresses or usernames.

Room Functions

• • • Create, join, leave, delete, and list rooms (chat or voice types).

Messaging Functions

• • • Send messages and signaling content within rooms.

Events

• • • RoomCreated: When a new room is created.
    • UserJoinedRoom: When a user successfully joins a room.
    • MessageSent: When a message is sent in a room.
    • RoomDeleted: When a room is deleted by its creator.
    • UserRegistered: When a user successfully registers.
    • SignalingMessage: When signaling for voice communication is exchanged.

Security Considerations

• • • Ensure room passwords remain private.
    • Conduct regular audits of the smart contract for security vulnerabilities.
    • Users must only join trusted rooms, as all messages are stored on-chain.