Legacy Chain: A Secure NFT-Based Digital will System Integrating Biometric KYC

This research paper proposes an effective, secure, and immutable digital will system through the use of blockchain technology, aiming to replace traditional paper-based methods that are vulnerable to fraud and theft. The system utilizes the Polygon network to ensure the immutability and transparency of the Testator’s will through the use of cryptographic hashing. The system also includes a verification process with multiple tiers, including the Lawyer and the Admin, as well as an analytical dashboard for monitoring the system in real time. The innovation in the system lies in the integrationof
the "Dead Man's Switch" principle, which will notify the stakeholders in case there is no activity from the testator for some period of time. To guarantee maximum security, is mandatory for the Beneficiary to get verified through Aadhaar-based biometric authentication, that is, Face Scan, prior to transferring the property in the form of NFTs.

Blockchain, Digital Will, Polygon Network

1. Nakamoto, A., et al. (2024). "Evolution of Decentralized Ledgers: From Bitcoin to Layer-2 Solutions." Journal of Blockchain Research. [Google Scholar] [Crossref]

2. Polygon Labs. (2024). "Polygon 2.0: Scaling the Value Layer and the Architecture of Amoy Testnet." Technical Whitepaper. [Google Scholar] [Crossref]

3. Sharma, R., & Varma, S. (2024). "Decentralized Inheritance: Solving the Oracle Problem with Multi-tier Admin Verification." International Journal of Blockchain Studies. [Google Scholar] [Crossref]

4. Gupta, A. (2025). "Biometric Authentication and Aadhaar KYC Integration in Layer-2 Blockchain Solutions." Journal of Cyber Security and Data Privacy. [Google Scholar] [Crossref]

5. Lee, H., et al. (2024). "Smart Contracts for Digital Asset Succession: A Comparative Study of Ethereum and Polygon Gas Efficiency." IEEE Transactions on Cloud Computing. [Google Scholar] [Crossref]

6. Patel, K. (2024). "NFTs as Legal Instruments: The Future of Digital Ownership Certificates in Inheritance." Blockchain Law Review. [Google Scholar] [Crossref]

7. Chen, Y., & Wang, L. (2025). "Next-Generation Dead Man's Switch: Automated Smart Contract Triggers using AI Diagnostics." Journal of Network Security. [Google Scholar] [Crossref]

8. Davis, M. (2024). "The Role of IPFS in Decentralized Content Storage for Legal Documentation." International Journal of Distributed Systems. [Google Scholar] [Crossref]

9. Roberts, J. (2024). "Cryptographic Hashing (SHA-256) and Data Integrity in Modern Web3 Applications." Cybersecurity Insights. [Google Scholar] [Crossref]

10. Kumar, P., & Singh, J. (2025). "User-Centric Biometric Recovery Mechanisms for Blockchain Wallets." International Journal of Human-Computer Interaction. [Google Scholar] [Crossref]

11. Miller, S. (2024). "Smart Contract Auditing: Preventing Vulnerabilities in Automated Asset Transfer Systems." IEEE Security & Privacy. [Google Scholar] [Crossref]

12. Zhao, X., et al. (2024). "High-Throughput Blockchain Networks: Analysis of Transaction Finality in Polygon PoS." Computer Networks Journal. [Google Scholar] [Crossref]

13. Thompson, L. (2025). "Decentralized Identity (DID) and its Integration with National Identification Systems (Aadhaar)." Identity Management Review. [Google Scholar] [Crossref]

14. Brown, T. (2024). "Sustainability in Blockchain: The Shift from Proof-of-Work to Proof-of-Stake Efficiency." Green Tech Quarterly. [Google Scholar] [Crossref]

15. Wilson, D. (2024). "Legal Challenges of Blockchain-Based Wills in Global Jurisdictions." Global Legal Studies. [Google Scholar] [Crossref]

16. Martinez, C. (2025). "Cross-Chain Asset Management: Future Scope of Digital Legacy Systems." Blockchain Interoperability Journal. [Google Scholar] [Crossref]

17. Anderson, P. (2024). "Privacy-Preserving KYC: Using Zero-Knowledge Proofs for Biometric Verification." Cryptography Research. [Google Scholar] [Crossref]

18. Taylor, B. (2024). "The Impact of Layer-2 Scaling on Decentralized Finance and Ownership." Financial Innovation Journal. [Google Scholar] [Crossref]

19. White, E., & Scott, R. (2025). "Automating the Probate Process: A Technical Framework for Smart Wills." Journal of Legal Automation. [Google Scholar] [Crossref]

20. Harris, F. (2024). "Data Immutability and the Right to be Forgotten: Navigating Blockchain Challenges." Data Ethics Review. [Google Scholar] [Crossref]

21. Lewis, G. (2024). "User Experience (UX) Design for Non-Technical Users in Web3 Environments." UX Design Journal. [Google Scholar] [Crossref]

22. Clark, H. (2025). "Advancements in Face-Scan Liveness Detection for Secure Identity Mapping." AI and Biometrics Review. [Google Scholar] [Crossref]

23. Walker, I. (2024). "Economic Impact of Low-Gas Blockchain Networks on Micro-Asset Inheritance." Economic Trends in Tech. [Google Scholar] [Crossref]

24. Young, J. (2024). "Scalable API Gateways for Secure Communication between Web2 and Web3." Journal of Web Engineering. [Google Scholar] [Crossref]

25. Hall, M., et al. (2025). "Legacy Chain: A Paradigm Shift in Digital Succession and Human Legacy Protection." Digital Heritage Quarterly. [Google Scholar] [Crossref]

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