Examining the Security Role of Quantum-Resistant Smart Contracts in Protecting Sensitive Data in Blockchain Applications

This study examines the security of quantum-resistant smart contracts for protecting data on blockchain networks, as quantum computing poses an increasing threat to traditional cryptography. As blockchain becomes a mainstay of critical digital networks, ensuring its security mechanisms are durable and dependable is crucial. The research aims to evaluate the effectiveness, efficiency, and practical feasibility of integrating post-quantum cryptographic algorithms, specifically CRYSTALS-Dilithium, into innovative contract frameworks to enhance quantum resilience. A hybrid research design was employed, incorporating theoretical analysis, simulation-based experimentation, and performance evaluation. Data was obtained from scientific studies, specialized blockchain platforms, and sources for cryptographic measurements. Every stage of the development and testing of smart contracts was conducted using Solidity, the Open Zeppelin libraries, and quantum-resistant cryptography routines, which were integrated through external frameworks. Information security tenets such as confidentiality, integrity, and availability were among the primary metrics. Other evaluation aspects included the system's efficiency (in terms of gas cost, latency, and computational requirements) and protection against quantum attacks. The results demonstrated that while quantum-resistant smart contracts incur higher computational costs and resource demands, they significantly outperform traditional contracts in security, particularly in the context of quantum threats.