Aviv Yaish

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Bio. I research the intricate relationship between the economics and security of cryptocurrencies. I am currently finishing my PhD at HUJI, where I had the pleasure of being advised by Prof. Aviv Zohar, and will soon start a postdoc at Yale, where I am grateful for being hosted by Prof. Fan Zhang, and co-hosted by Profs. Ben Fisch, Charalampos (Babis) Papamanthou, and Zhong Shao. I am also a visiting researcher at the University of Innsbruck, where I am graciously hosted by Profs. Rainer Böhme and Svetlana Abramova. Previously, I was a lecturer at HUJI and received an award for my teaching. Among other honors, I was named one of the top PhD graduates of 23-24 by the CBER Forum, received the CCS Distinguished Paper award, and was generously supported by Ethereum Foundation grants, an AIANI fellowship, the Ze’ev Jabotinsky fellowship, and HUJI’s rector award for first-in-class MSc students.

Do get in touch if you want to collaborate or chat. This includes undergrads looking for cool projects.

News

May 23, 2024 Honored to have won the 4th Annual CBER Conference’s best paper award for Suboptimality in DeFi!
Apr 6, 2024 Hao Chung, Matheus VX Ferreira, Yotam Gafni & I will give a tutorial on transaction fee mechanisms at EC24.
Mar 28, 2024 I will present Suboptimality in DeFi at the 4th Annual CBER Conference.

Selected Papers

  1. Speculative Denial-of-Service Attacks in Ethereum
    Aviv YaishKaihua QinLiyi Zhou, and 2 more authors
    In 33rd USENIX Security Symposium (USENIX Security 24), 2024
    🏆 Awarded a Flashbots bounty
    🏆 Awarded an Ethereum Foundation bounty
  2. Barriers to Collusion-resistant Transaction Fee Mechanisms
    Yotam Gafni, and Aviv Yaish
    In Proceedings of the 25th ACM Conference on Economics and Computation, 2024
  3. Uncle Maker: (Time)Stamping Out The Competition in Ethereum
    Aviv YaishGilad Stern, and Aviv Zohar
    In Proceedings of the 2023 ACM SIGSAC Conference on Computer and Communications Security, 2023
    🏆 Received an ACM CCS distinguished paper award
    🏆 Covered by International Business Times, CryptoSlate, Cointelegraph
  4. Blockchain Stretching & Squeezing: Manipulating Time for Your Best Interest
    Aviv YaishSaar Tochner, and Aviv Zohar
    In Proceedings of the 23rd ACM Conference on Economics and Computation, 2022
    🏆 Awarded an Ethereum Foundation bounty
Click here for my full publication list

2024

  1. Speculative Denial-of-Service Attacks in Ethereum
    Aviv YaishKaihua QinLiyi Zhou, and 2 more authors
    In 33rd USENIX Security Symposium (USENIX Security 24), 2024
    🏆 Awarded a Flashbots bounty
    🏆 Awarded an Ethereum Foundation bounty
  2. Barriers to Collusion-resistant Transaction Fee Mechanisms
    Yotam Gafni, and Aviv Yaish
    In Proceedings of the 25th ACM Conference on Economics and Computation, 2024
  3. Blockchain Censorship
    Anton WahrstätterJens ErnstbergerAviv Yaish, and 8 more authors
    In Proceedings of the ACM on Web Conference 2024, 2024
  4. Suboptimality in DeFi
    Aviv YaishMaya DotanKaihua Qin, and 2 more authors
    In the 4th Annual Crypto and Blockchain Economics Research Forum Conference, 2024
    🏆 Received the 4th Annual CBER Conference’s best paper award
  5. Discrete & Bayesian Transaction Fee Mechanisms
    Yotam Gafni, and Aviv Yaish
    In Mathematical Research for Blockchain Economy, 2024
  6. Incentives in the Ether: Practical Cryptocurrency Economics & Security
    Aviv Yaish
    In Companion Proceedings of the ACM on Web Conference 2024, 2024
  7. 2024
    Strategic Vote Timing in Elections With Public Tallies
    Aviv YaishSvetlana Abramova, and Rainer Böhme
    2024
  8. 2024
    Competitive Revenue Extraction from Time-Discounted Transactions in the Semi-Myopic Regime
    Yotam Gafni, and Aviv Yaish
    2024

2023

  1. Uncle Maker: (Time)Stamping Out The Competition in Ethereum
    Aviv YaishGilad Stern, and Aviv Zohar
    In Proceedings of the 2023 ACM SIGSAC Conference on Computer and Communications Security, 2023
    🏆 Received an ACM CCS distinguished paper award
    🏆 Covered by International Business Times, CryptoSlate, Cointelegraph
  2. The Vulnerable Nature of Decentralized Governance in DeFi
    Maya DotanAviv Yaish, Hsin-Chu Yin, and 2 more authors
    In Proceedings of the 2023 Workshop on Decentralized Finance and Security, 2023
  3. Greedy Transaction Fee Mechanisms for (Non-)myopic Miners
    Yotam Gafni, and Aviv Yaish
    In 12th Annual Conference of the Israeli Chapter of the Game Theory Society, 2023
  4. Correct Cryptocurrency ASIC Pricing: Are Miners Overpaying?
    Aviv Yaish, and Aviv Zohar
    In 5th Conference on Advances in Financial Technologies, 2023
  5. 2023
    Airdrops: Giving Money Away Is Harder Than It Seems
    Johnnatan Messias^*, Aviv Yaish^*, and Ben Livshits
    2023
    Equal contribution denoted by ^*.

2022

  1. Blockchain Stretching & Squeezing: Manipulating Time for Your Best Interest
    Aviv YaishSaar Tochner, and Aviv Zohar
    In Proceedings of the 23rd ACM Conference on Economics and Computation, 2022
    🏆 Awarded an Ethereum Foundation bounty
Click here for my CV

General Information

Full Name Aviv Yaish
Email aviv@avivyaish.com
Research Interests Blockchains, Economics, Security, Decentralized Finance

Research Positions

Education

  • 2019 -
    Direct-to-PhD, Computer Science
    The Hebrew University
    • Advised by Prof. Aviv Zohar
    • Recipient of the merit-based 4-year Ze’ev Jabotinsky Fellowship
  • 2016 - 2018
    Master of Science (M.Sc.), Computer Science
    The Hebrew University
    • Advised by Prof. Aviv Zohar
    • Recipient of the rector prize for ranking first in class
  • 2013 - 2016
    Bachelor of Science (B.Sc.), Computer Science
    The Hebrew University
    • Recipient of the merit-based "Amirim science" excellence scholarship

Grants

Honors, Awards and Funding

  • 2024
    • The 4th Annual CBER Conference's best paper award, sponsored by the FinTech at Cornell Initiative
  • 2023
    • ACM CCS23 distinguished paper award
    • Ethereum Foundation bounty
    • Flashbots vulnerability bounty
    • AIANI visiting researcher fellowship
    • AFT23 student travel funding
    • ACM CCS23 travel grant
    • iMentor23 travel funding
    • ACM EC23 student travel funding
    • Devconnect academic sponsorship (awarded, could not participate)
    • Fenbushi Capital Research House Program (awarded, could not participate)
    • HUJI's Diversity Unit's March 23 travel scholarship for outstanding PhD students
    • HUJI's Diversity Unit's September 23 travel scholarship for outstanding PhD students
  • 2022
    • HUJI Authority for Research Students' travel grant
    • Vaad Edat Hasfaradim’s scholarship
  • 2021
    • Award for excellence in teaching
    • Ethereum Foundation bounty (awarded, didn't collect)
  • 2020
    • Ranked 9th out of 111 teaching staff in HUJI's CS department
  • 2019
    • Ze’ev Jabotinsky 4 year merit-based fellowship
    • Zcash Foundation Zcon1 travel scholarship
  • 2018
    • HUJI Rector's prize for ranking first in MSc class
    • HUJI Dean's award for outstanding academic achievements
  • 2016
    • First place at HUJI's annual machine learning hackathon
  • 2013
    • Amirim science excellence scholarship for undergraduates
  • 2007
    • Ranked in the 99th percentile in Israel's SAT equivalent (psychometric exam)

Publications

Conference Papers

  • CBER '24
    Suboptimality in DeFi
    Aviv Yaish, Maya Dotan, Kaihua Qin, Aviv Zohar, Arthur Gervais
    • Presented in the 4th Annual Crypto and Blockchain Economics Research (CBER) Conference (15% acceptance rate)
    • Received the 4th Annual CBER Conference's best paper award 🏆
  • IGTC '23
    Greedy Transaction Fee Mechanisms for (Non-)myopic Miners
    Yotam Gafni, Aviv Yaish
    • Presented in the 12th Annual Conference of the Israeli Chapter of the Game Theory Society

Papers

Teaching

  • 2018 - 2024
    System Introduction (67100), creator and lecturer
    The Hebrew University
    • Sole lecturer and creator, taught an average of 850 students/year
  • 2017 - 2023
    From NAND to Tetris (67925/6), lecturer
    The Hebrew University
    • Sole lecturer, managed a team of 7 TAs, taught an average of 500+ students/year
  • 2021
    Award for excellence in teaching
    The Hebrew University
  • 2020
    Introduction to Cryptocurrencies (67513), co-creator and TA
    The Hebrew University
  • 2020
    Ranked 9th out of 111 teaching staff in the CS department
    The Hebrew University

Undergraduate Project Supervision

  • 2022 - 2023
    Nimrod Rak
    The Hebrew University
    • Title: Simulating cryptocurrency networks using real clients
  • 2022 - 2022
    Eytan Tsytkin
    The Hebrew University
    • Title: Application of Big Data methods to cryptocurrencies
  • 2021 - 2022
    Imri Paran
    The Hebrew University
    • Title: An exploration of Bitcoin's attack surface

Service

  • 2024
    • Journal referee. ACM TEAC, INFORMS MOR
    • Program committee. MARBLE, EC, AFT
  • 2023
    • Program committee. CCS DeFi Workshop
    • In-person volunteer. EC
    • Reviewer. CCS, EC, FC, SODA, WWW, WEIS, FC DeFi Workshop
  • 2022
    • Reviewer. S&P, SODA, WWW
  • 2020
    • Reviewer. AFT

Talks

  • Incentives in the Ether: Practical Cryptocurrency Economics & Security
  • Speculative Denial-of-Service Attacks in Ethereum
  • Greedy Transaction Fee Mechanisms for (Non-)myopic Miners
    • The Annual Conference of the Israeli Chapter of the Game Theory Society, 2023
  • Supoptimality in DeFi
    • The 4th Annual Crypto and Blockchain Economics Research (CBER) Conference, 2024
    • UCSB-ECON DeFi Seminar (invited), 2024
    • The Science of Decentralized Financial Stability Workshop (invited), 2023
    • Schloss Dagstuhl seminar 22421 (invited), 2022
  • Uncle Maker: (Time)Stamping Out The Competition in Ethereum
  • Blockchain Stretching & Squeezing: Manipulating Time For Your Best Interest
  • Correct Cryptocurrency ASIC Pricing: Are Miners Overpaying?

Other

  • 2023
    Received Melabev's certificate of appreciation for outstanding volunteer services
    Melabev
  • 2020 - 2022
    Volunteered with elderly people with dementia
    Melabev