Panagiotis Chatzigiannis
Research Scientist

Panagiotis Chatzigiannis

Visa Research

I work on cryptography, blockchains, privacy-enhancing technologies, and security for modern financial and distributed systems.

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About

Hello, I’m Panagiotis (Panos). I joined Visa Research as a Research Scientist in June 2022. I completed my PhD at George Mason University in June 2022 under the supervision of Dr. Foteini Baldimtsi.

My research lies in the field of cryptography and blockchains. I initially focused on blockchain auditability, accountable payment systems, blockchain support for resource-constrained devices, and improving the usability of blockchain applications.

My more recent work focuses on account and fund recovery mechanisms in blockchains, privacy-preserving financial systems, and secure architectures for decentralized applications. I also worked as a summer intern and part-time researcher with Facebook/Novi.

Publications

  1. Diversification across mining pools: Optimal mining strategies under PoW paper (WEIS 2019)
  2. Black-Box IoT: Authentication and Distributed Storage of IoT Data from Constrained Sensors paper (IoTDI 2021)
  3. Reactive Key-Loss Protection in Blockchains paper (WTSC FC21)
  4. SoK: Auditability and Accountability in Distributed Payment Systems paper (ACNS 2021)
  5. MiniLedger: Compact-sized Anonymous and Auditable Distributed Payments paper (ESORICS 2021)
  6. Proof of Assets in the Diem Blockchain paper (AIBlock 2021)
  7. Homomorphic decryption in blockchains via compressed discrete-log lookup tables paper (CBT 2021)
  8. SoK: Blockchain Light Clients paper (FC 2022)
  9. Broken Proofs of Solvency in Blockchain Custodial Wallets and Exchanges paper (FC Workshops 2022)
  10. Unlinkability and Interoperability in Account-Based Universal Payment Channels paper (FC 2023 Workshops)
  11. Privacy-Enhancing Technologies for Financial Data Sharing paper
  12. Privacy-Preserving Financial Anomaly Detection via Federated Learning & Multi-Party Computation paper (Special Recognition Prize in PETs Challenge 2022)
  13. Unlinkability and Interoperability in Account-Based Universal Payment Channels paper
  14. Scalable Off-Chain Auctions paper
  15. SoK: Web3 Recovery Mechanisms paper
  16. Truncator: Time-space Tradeoff of Cryptographic Primitives paper (FC 2024)
  17. A Plug-and-Play Long-Range Defense System for Proof-of-Stake Blockchains paper (ESORICS 2024)
  18. SoK: Fully-homomorphic Encryption in Smart Contracts paper
  19. DTL: Data Tumbling Layer - A Composable Unlinkability for Smart Contracts paper
  20. Lite-PoT: Practical Powers-of-Tau Setup Ceremony paper
  21. A Composability Analysis Framework for Web3 Wallet Recovery Mechanisms (IEEE S&P 2025)