Blockchain Meetup

PoS blockchain protocols

19 July, 6:00 pm - 9:00 pm
Primalbase Amsterdam, van Diemenstraat 20-200

How do we reach consensus without compromising security?

How do we reach consensus without compromising security?
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PoS blockchain protocols
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As high energy requirements and slow speeds push us to find alternatives to the proof-of-work algorithm, consensus models are now being used and investigated to deal with open-ended participation.

To protect data and uphold the state of the blockchain, consensus algorithms have to withstand node failures, network partitions and delayed and corrupted messages.

Avoiding a centralised monopoly — with those with the highest stakes controlling the blockchain — is another issue that is being addressed in the proof-of-stake model.

A functional, efficient and secure consensus algorithm is certainly necessary, but how can it be achieved?
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Proof-of-stake consensus algorithms

In this talk, Dr. Bernardo David introduces Ouroboros, the first blockchain protocol based on proof-of-stake with rigorous security guarantees. Ouroboros is currently used by the Cardano project blockchain.

Bernardo also walks us through the Ouroboros praos protocol, which improves on the efficiency of Ouroboros and is scheduled to be deployed in the next versions of the Cardano project. He will highlight the main techniques developed in the process of designing these protocols, which find applications in the design and security analysis of other PoS protocols.
About the speaker
Dr. Bernardo David is an Assistant Professor at the Tokyo Institute of Technology, working on cryptographic protocols for privacy preserving computation, cryptocurrencies and blockchain applications. He holds a Ph. D. in Computer Science from Aarhus University obtained under the supervision of Ivan Damgård and Jesper Buus Nielsen. He has been a visiting researcher at NTT Corporation’s Secure Platform Laboratories in Japan and at the Cryptography Research Group of Bar Ilan University in Israel. He has previously worked in both the public and private sectors in Brazil as an IT consultant on network infrastructure and security.
Moderator: Mix
Mix is a senior reporter for The Next Web, covering internet culture, security and cryptocurrency. In his free time, he likes to engage in heated arguments with his readers and ruminate over the future of technology.


David Bernardo
Assistant Professor, Tokyo Institute of Technology


6:00 pm — 6:45 pm
6:45 pm — 7:00 pm
Blockchains and consensus: an overview
7:00 pm — 7:30 pm
Secure proof-of-stake blockchain protocols
David Bernardo, Assistant Professor, Tokyo Institute of Technology
7:30 pm — 7:45 pm
Fireside chat
David Bernardo, Assistant Professor, Tokyo Institute of Technology, Mix, Moderator, senior reporter for The Next Web
8:00 pm — 9:00 pm