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Documents authored by Shapiro, Ehud

Document
DOI: 10.4230/LIPIcs.DISC.2023.26
Cordial Miners: Fast and Efficient Consensus for Every Eventuality

Authors: Idit Keidar, Oded Naor, Ouri Poupko, and Ehud Shapiro

Published in: LIPIcs, Volume 281, 37th International Symposium on Distributed Computing (DISC 2023)

Abstract
Cordial Miners are a family of efficient Byzantine Atomic Broadcast protocols, with instances for asynchrony and eventual synchrony. They improve the latency of state-of-the-art DAG-based protocols by almost 2× and achieve optimal good-case complexity of O(n) by forgoing Reliable Broadcast as a building block. Rather, Cordial Miners use the blocklace - a partially-ordered counterpart of the totally-ordered blockchain data structure - to implement the three algorithmic components of consensus: Dissemination, equivocation-exclusion, and ordering.
Cite as

Idit Keidar, Oded Naor, Ouri Poupko, and Ehud Shapiro. Cordial Miners: Fast and Efficient Consensus for Every Eventuality. In 37th International Symposium on Distributed Computing (DISC 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 281, pp. 26:1-26:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{keidar_et_al:LIPIcs.DISC.2023.26,
  author =	{Keidar, Idit and Naor, Oded and Poupko, Ouri and Shapiro, Ehud},
  title =	{{Cordial Miners: Fast and Efficient Consensus for Every Eventuality}},
  booktitle =	{37th International Symposium on Distributed Computing (DISC 2023)},
  pages =	{26:1--26:22},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-301-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{281},
  editor =	{Oshman, Rotem},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.DISC.2023.26},
  URN =		{urn:nbn:de:0030-drops-191525},
  doi =		{10.4230/LIPIcs.DISC.2023.26},
  annote =	{Keywords: Byzantine Fault Tolerance, State Machine Replication, DAG, Consensus, Blockchain, Blocklace, Cordial Dissemination}
}
Document
Brief Announcement
DOI: 10.4230/LIPIcs.DISC.2023.47
Brief Announcement: Grassroots Distributed Systems: Concept, Examples, Implementation and Applications

Authors: Ehud Shapiro

Published in: LIPIcs, Volume 281, 37th International Symposium on Distributed Computing (DISC 2023)

Abstract
Informally, a distributed system is grassroots if it is permissionless and can have autonomous, independently-deployed instances - geographically and over time - that may interoperate voluntarily once interconnected. More formally, in a grassroots system the set of all correct behaviors of a set of agents P is strictly included in the set of the correct behaviors of P when they are embedded within a larger set of agents P' ⊃ P. Grassroots systems are potentially important as they may allow communities to conduct their social, economic, civic, and political lives in the digital realm solely using their members' networked computing devices (e.g., smartphones), free of third-party control, surveillance, manipulation, coercion, or rent seeking (e.g., by global digital platforms such as Facebook or Bitcoin). Client-server/cloud computing systems are not grassroots, and neither are systems designed to have a single global instance (Bitcoin/Ethereum with hardwired seed miners/bootnodes), and systems that rely on a single global data structure (IPFS, DHTs). An example grassroots system would be a serverless smartphone-based social network supporting multiple independently-budding communities that can merge when a member of one community becomes also a member of another. Here, we formalize the notion of grassroots distributed systems; describe a grassroots dissemination protocol for the model of asynchrony and argue its safety, liveness, and being grassroots; extend the implementation to mobile (address-changing) devices that communicate via an unreliable network (e.g. smartphones using UDP); and discuss how grassroots dissemination can realize grassroots social networking and grassroots cryptocurrencies. The mathematical construction employs distributed multiagent transition systems to define the notions of grassroots protocols, to specify the grassroots dissemination protocols, and to prove their correctness. The protocols use the blocklace - a distributed, partially-ordered counterpart of the replicated, totally-ordered blockchain.
Cite as

Ehud Shapiro. Brief Announcement: Grassroots Distributed Systems: Concept, Examples, Implementation and Applications. In 37th International Symposium on Distributed Computing (DISC 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 281, pp. 47:1-47:7, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{shapiro:LIPIcs.DISC.2023.47,
  author =	{Shapiro, Ehud},
  title =	{{Brief Announcement: Grassroots Distributed Systems: Concept, Examples, Implementation and Applications}},
  booktitle =	{37th International Symposium on Distributed Computing (DISC 2023)},
  pages =	{47:1--47:7},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-301-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{281},
  editor =	{Oshman, Rotem},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.DISC.2023.47},
  URN =		{urn:nbn:de:0030-drops-191735},
  doi =		{10.4230/LIPIcs.DISC.2023.47},
  annote =	{Keywords: Grassroots Distributed Systems, Dissemination Protocol, Multiagent Transition Systems, Blocklace, Cordial Dissemination}
}
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