Rational vs Byzantine Players in Consensus-based Blockchains

Speaker : Yackolley Amoussou-Guenou
Sorbonne Université
Date: 30/10/2019
Time: 2:00 pm - 3:00 pm
Location: Paris-Rennes Room (EIT Digital)


In this presentation, we will analyse from the game theoretical point of view Byzantine Fault Tolerant (BFT) blockchains when processes exhibit rational or Byzantine behaviour. Our work models committee/consensus-based blockchains, such as as a committee coordination game.
We provide a game-theoretical methodology to analyse equilibrium interactions between Byzantine and rational committee members in BFT blockchains.
Byzantine players seek to inflict maximum damage to the system, while rational players best-respond to maximise their expected net gains.
We then derive conditions under which consensus properties are satisfied or not in equilibrium.


Yackolley Amoussou-Guenou is a PhD student in LIP6, the computer science lab of Sorbonne Université, and in CEA List.
He received his master degree from Université Paris-Diderot and his undergraduate degree from Université Paris-Est Créteil.
His research focuses on distributed systems and blockchains, and in particular on the application of game theory on blockchains.