Blockchain technology has become a transformative platform for secure digital transactions by enabling decentralization, transparency, immutability, and distributed trust across multiple application domains. Despite these advantages, existing blockchain platforms primarily rely on conventional cryptographic algorithms such as RSA and Elliptic Curve Cryptography (ECC), which are vulnerable to emerging quantum computing attacks. Furthermore, modern blockchain ecosystems face increasing cybersecurity challenges, including fraudulent transactions, malicious smart contracts, unauthorized access, identity spoofing, network intrusions, and sophisticated cyberattacks that cannot be effectively addressed using traditional security mechanisms alone. To overcome these limitations, this paper proposes a Quantum Secure Blockchain Framework with Machine Learning-Based Threat Detection and Smart Contract Validation, which integrates post-quantum cryptography, intelligent threat detection, trust evaluation, and blockchain security within a unified architecture. The proposed framework employs quantum-resistant cryptographic algorithms such as CRYSTALS-Kyber, CRYSTALSDilithium, Falcon, and SPHINCS+ to secure authentication, digital signatures, and transaction verification against future quantum attacks. Simultaneously, machine learning models, including Random Forest and anomaly detection techniques, continuously analyse transaction behaviour, network traffic, and user activities to identify fraudulent operations and predict security risks before transaction confirmation. A trust management engine computes dynamic trust scores based on historical transaction behaviour, while smart contract validation mechanisms verify transaction authenticity, authorization privileges, fraud probability, and compliance before blockchain execution. The framework is implemented using Python, Django, Solidity, Web3.py, Scikit-Learn, Ethereum, and MySQL, providing secure communication between decentralized applications and blockchain networks. Experimental analysis demonstrates that the proposed architecture significantly improves fraud detection accuracy, enhances transaction integrity, strengthens smart contract security, reduces malicious activities, and provides long-term resilience against both classical and quantum cyber threats. Consequently, the proposed framework establishes a scalable, intelligent, and future-proof blockchain ecosystem suitable for secure financial systems, healthcare, digital identity management, supply chain applications, and next-generation decentralized services.
Keywords : Blockchain Security, Post-Quantum Cryptography, Machine Learning, Threat Detection, Smart Contract Validation, CRYSTALS-Kyber, CRYSTALS-Dilithium, Falcon, SPHINCS+, Random Forest, Ethereum, Web3.py, Fraud Detection, Trust Management, Quantum Computing.
Author : 1D SAI BHANU VARSHIT, 2K UMA
Title : QUANTUM SECURE BLOCKCHAIN FRAMEWORK WITH MACHINE LEARNING-BASED THREAT DETECTION AND SMART CONTRACT VALIDATION
Volume/Issue : 2026;03(07)
Page No : 736-747