Blockchain-based User Management System

As the Internet and information technology advance, safeguarding user personal data is critical. Traditional registration and key storage methods pose security risks like data breaches and centralized vulnerabilities. This paper proposes a solution integrating elliptic curve encryption, multi-party collaboration, blockchain, and secret sharing. The system divides roles among users, blockchain systems, and regulators, using secure channels and distributed storage to manage keys and protect user information. Experimental results show high effectiveness with a 98% registration success rate, 95% key recovery rate, and zero information leaks. This approach enhances system stability and user satisfaction while ensuring privacy in online services.