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Prof Alexander Russell

Senior Research Fellow

Academic Research

USA

High-Throughput Permissionless Blockchain Consensus under Realistic Network Assumptions

Sandro Coretti-Drayton,Matthias Fitzi,Prof Aggelos Kiayias,Giorgos Panagiotakos,Prof Alexander Russell

August/2025, To appear in: Crypto '25

THROUGHPUT

Competitive Policies for Online Collateral Maintenance

Ghada Almashaqbeh,Sixia Chen,Prof Alexander Russell

September/2024, AFT '24

Consensus Redux: Distributed Ledgers in the Face of Adversarial Supremacy

Christian Badertscher,Peter Gaži,Prof Aggelos Kiayias,Prof Alexander Russell,Vassilis Zikas

July/2024, CSF '24

PROOF-OF-STAKE PROOF-OF-WORK SELF-HEALING

Fait Accompli Committee Selection: Improving the Size-Security Tradeoff of Stake-Based Committees

Peter Gaži,Prof Aggelos Kiayias,Prof Alexander Russell

November/2023, ACM CCS '23

Practical Settlement Bounds for Longest-Chain Consensus

Peter Gaži,Ling Ren,Prof Alexander Russell

August/2023, Crypto '23

BITCOIN PROOF-OF-STAKE PROOF-OF-WORK

Efficient Random Beacons with Adaptive Security for Ungrindable Blockchains

Prof Aggelos Kiayias,Cristopher Moore,Saad Quader,Prof Alexander Russell

July/2023, ICDCS '23

PSEUDORANDOMNESS

The Generals’ Scuttlebutt: Byzantine-Resilient Gossip Protocols

Sandro Coretti-Drayton,Prof Aggelos Kiayias,Cristopher Moore,Prof Alexander Russell

November/2022, ACM CCS '22

GOSSIP UNIVERSAL COMPOSITION

Practical Settlement Bounds for Proof-of-Work Blockchains

Peter Gaži,Ling Ren,Prof Alexander Russell

November/2022, ACM CCS '22

PROOF-OF-WORK

On UC-Secure Range Extension and Batch Verification for ECVRF

Christian Badertscher,Peter Gaži,Iñigo Querejeta Azurmendi,Prof Alexander Russell

September/2022, ESORICS '22

VRF

Ofelimos: Combinatorial Optimization via Proof-of-Useful-Work: A Provably Secure Blockchain Protocol

Matthias Fitzi,Prof Aggelos Kiayias,Giorgos Panagiotakos,Prof Alexander Russell

August/2022, Crypto '22

PROOF-OF-USEFUL-WORK

Ouroboros Chronos: Permissionless Clock Synchronization via Proof-of-Stake

Christian Badertscher,Peter Gaži,Prof Aggelos Kiayias,Prof Alexander Russell,Vassilis Zikas

October/2021, Eurocrypt '21

BLOCKCHAIN PROOF-OF-STAKE

Cardano Disaster Recovery Plan

Christian Badertscher,Nicholas Clarke,Jared Corduan,Duncan Coutts,Peter Gaži,Philipp Kant,Prof Aggelos Kiayias,Prof Alexander Russell

May/2021, IOHK

CARDANO

Hydra: Fast Isomorphic State Channels

Manuel Chakravarty,Sandro Coretti-Drayton,Matthias Fitzi,Peter Gaži,Philipp Kant,Prof Aggelos Kiayias,Prof Alexander Russell

March/2021, Financial Cryptography 2021

LAYER-TWO STATECHANNEL

Tight Consistency Bounds for Bitcoin

Peter Gaži,Prof Aggelos Kiayias,Prof Alexander Russell

November/2020, ACM CCS '20

BITCOIN PROOF-OF-STAKE PROOF-OF-WORK

Ledger Combiners for Fast Settlement

Matthias Fitzi,Peter Gaži,Prof Aggelos Kiayias,Prof Alexander Russell

November/2020, TCC '20

AMPLIFICATION COMBINER LEDGER

Consistency of Proof-of-Stake Blockchains with Concurrent Honest Slot Leaders

Prof Aggelos Kiayias,Saad Quader,Prof Alexander Russell

November/2020, ICDCS '20

BLOCKCHAIN PROOF-OF-STAKE

The Combinatorics of the Longest-Chain Rule: Linear Consistency for Proof-of-Stake Blockchains

Erica Blum,Prof Aggelos Kiayias,Cristopher Moore,Saad Quader,Prof Alexander Russell

January/2020, SODA20

BLOCKCHAIN PROOF-OF-STAKE

Proof-of-Stake Blockchain Protocols with Near-Optimal Throughput

Matthias Fitzi,Peter Gaži,Prof Aggelos Kiayias,Prof Alexander Russell

January/2020, ePrint Archive

PROOF-OF-STAKE THROUGHPUT

Parallel Chains: Improving Throughput and Latency of Blockchain Protocols via Parallel Composition

Matthias Fitzi,Peter Gaži,Prof Aggelos Kiayias,Prof Alexander Russell

November/2018, EPrint Archive

BLOCKCHAIN DISTRIBUTED PROTOCOL SCALABILITY

Ouroboros-BFT: A Simple Byzantine Fault Tolerant Consensus Protocol

Prof Aggelos Kiayias,Prof Alexander Russell

October/2018, EPrint Archive

BFT BLOCKCHAIN CONSENSUS DISTRIBUTED PROTOCOL

Stake-Bleeding Attacks on Proof-of-Stake Blockchains

Peter Gaži,Prof Aggelos Kiayias,Prof Alexander Russell

June/2018, Crypto Valley'18

ATTACK DISTRIBUTED PROOF-OF-STAKE

Ouroboros Praos: An adaptively-secure, semi-synchronous proof-of-stake protocol

Bernardo David,Peter Gaži,Prof Aggelos Kiayias,Prof Alexander Russell

April/2018, EUROCRYPT 2018

CONSENSUS CRYPTOCURRENCY PROOF-OF-STAKE

Ouroboros: A Provably Secure Proof-of-Stake Blockchain Protocol

Prof Aggelos Kiayias,Prof Alexander Russell,Bernardo David,Prof Roman Oliynykov

August/2017, CRYPTO 2017 (ePrint Archive)

BLOCKCHAIN CRYPTOCURRENCY PROOF-OF-STAKE