IDChat, a Web 3 application emphasizing data transparency, successfully hosted a launch event on the Bitcoin mainnet, imprinting text and image data in real time on the blockchain. The event attracted over 2,000 viewers via the IDChat app, which uniquely allows access through public keys, eliminating the need for phone numbers or email addresses and preventing data misuse. Unlike typical Web 3 social apps, IDChat stores messages and social relationships directly on-chain, ensuring verifiable data integrity and privacy. All communications are end-to-end encrypted, providing anti-censorship features and safeguarding user privacy. This development signifies a transformative use of Bitcoin, expanding its role from a financial ledger to a social application platform.