Common Prefix is a team of scientists and engineers specializing in blockchains. We work from first principles, with an eye for rigor and formal cryptographic security proofs. We contribute as the advisory team for Harmony's underlying science. With a focus on consensus foundations and experts in the areas of proof-of-stake, auctions, layer 2, sharding, channels, bootstrapping, light clients, wallets, smart contracts, and interoperability, we review and recommend changes in all the fundamentals and protocol parameters. We deliver concrete recommendations for changes in the protocol and codebase, technical reports for dissemination within the community, and peer-reviewed research papers published in top-tier academic conferences describing our findings.
Dr. Zeta Avarikioti
Dr. Zeta Avarikioti
Zeta is a post-doctoral blockchain researcher at IST Austria and TU Wien working with professor Krzysztof Pietrzak and based in Vienna. She graduated with a PhD from ETH Z├╝rich and holds an engineering degree from the National Technical University of Athens. She specializes in distributed systems, scaling blockchains via sharding and channels, and the analysis of cryptoeconomic incentives. Among other venues, she has published in Financial Crypto and SODA. Highlights of her research include the papers BRICK: Asynchronous Payment Channels, Cerberus Channels: Incentivizing Watchtowers for Bitcoin, and Divide and Scale: Formalization of Distributed Ledger Sharding Protocols.
Dr. Pyrros Chaidos
Dr. Pyrros Chaidos
Pyrros is a post-doctoral blockchain researcher at the University of Athens. He holds a PhD from the University College of London, an MSc in Information Security from the University College of London, an MSc in Theoretical Computer Science from the University of Athens, and a BA in Mathematics from the University of Athens. He specializes in zero knowledge proof systems, with applications on proof-of-stake blockchains and voting in particular. Among other venues, he has published in EUROCRYPT, ACM CCS, PKC, ESORICS, and the Journal of Cryptology. Highlights of his research include the papers Mithril: Stake-based Threshold Multisignatures, Efficient Zero-Knowledge Arguments for Arithmetic Circuits in the Discrete Log Setting, and Foundations of Fully Dynamic Group Signatures.
Dr. Dimitris Karakostas
Dr. Dimitris Karakostas
Dimitris is a post-doctoral blockchain researcher at the University of Edinburgh where he works with professor Aggelos Kiayias. He holds a PhD from the University of Edinburgh and an Electrical and Computer Engineering degree from the National Technical University of Athens. He specializes in cryptocurrency wallets and macroeconomics, as well as chain checkpointing. Among other venues, he has published in Financial Crypto and presented at Black Hat Europe and Asia. Highlights of his research include the papers A Formal Treatment of Hardware Wallets, Cryptocurrency Egalitarianism: A Quantitative Approach, and Securing Proof-of-Work Ledgers via Checkpointing.
Prof. Dr. Lefteris Kokoris-Kogias
Prof. Dr. Lefteris Kokoris-Kogias
Lefteris is an assistant professor at IST Austria based in Vienna. He holds a PhD from EPFL, and an Electrical and Computer Engineering degree from the National Technical University of Athens. He specializes in the systems aspects of blockchains with a focus on scalability, decentralized randomness generation, and software update dispersion. Among other venues, he has published in IEEE S&P (Oakland), USENIX Security, ACM CCS, PODC, ESORICS, and Financial Crypto. Highlights of his research include the papers Omniledger: A secure, scale-out, decentralized ledger via sharding, Enhancing bitcoin security and performance with strong consistency via collective signing, and Scalable bias-resistant distributed randomness.
Dimitris Lamprinos
Dimitris Lamprinos
Dimitris is a software engineer based in Thessaloniki. He holds a degree in Computer Science from Aristotle University of Thessaloniki. He works on smart contract development and basic consensus development. He has significant experience in developing and scaling web applications as well as blockchain development in the context of algorithmic trading. In the past, he has worked for Amondo and Geekbot. In Harmony, he is working closely with the scientists to implement surgical changes in the consensus layer pertaining to incentives, fees, and slashing.
Dr. Dionysis Zindros
Dr. Dionysis Zindros
Dionysis is a post-doctoral blockchain researcher at Stanford University. He holds a PhD from the University of Athens and an Electrical and Computer Engineering degree from the National Technical University of Athens. He specializes in blockchain scalability via light clients and fast bootstrapping. Among other venues he has published in IEEE S&P (Oakland), ACM CCS, ESORICS, and Financial Crypto, and presented at Black Hat Europe and Asia. Highlights of his research include the papers Non-Interactive Proofs of Proof-of-Work, Proof-of-Stake Sidechains, and Proof-of-Work Sidechains.