Enhanced DeFi Security on XRPL with Zero-Knowledge Proofs and Speaker Verification

Abstract

Blockchain technology has consistently attracted attention for its transparency, decentralization, and security. More everyday users, without technical expertise, are now using blockchain and cryptocurrencies to store funds. As decentralized finance (DeFi) rises, security and privacy challenges have emerged, particularly the risk of losing funds due to leaked private keys. Consequently, enhancing security with user-friendly authentication methods is crucial. Voice authentication is a promising solution to add a security layer to the blockchain, but it is difficult to implement in DeFi without compromising decentralization and data confidentiality. Furthermore, advances in deep learning in voice cloning pose risks to voice-based systems. To address these issues, we propose the ZK Verify Voice Authentication System, which enables spoofing-aware speaker verification for the XRP Ledger (XRPL). Confidentiality is ensured by integrating voice embeddings with zero-knowledge proofs (zk-SNARKs). Voice embeddings serve as digital signatures, with only their hash stored on XRPL. Our system improves security and user experience by allowing individuals to prove their identity without exposing voice data. This approach provides robust security and privacy for DeFi participants, while remaining accessible to those without technical expertise.