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Documents authored by Potop-Butucaru, Maria

Document
DOI: 10.4230/LIPIcs.DISC.2022.15
Dynamic Probabilistic Input Output Automata

Authors: Pierre Civit and Maria Potop-Butucaru

Published in: LIPIcs, Volume 246, 36th International Symposium on Distributed Computing (DISC 2022)

Abstract
We present probabilistic dynamic I/O automata, a framework to model dynamic probabilistic systems. Our work extends dynamic I/O Automata formalism of Attie & Lynch [Paul C. Attie and Nancy A. Lynch, 2016] to the probabilistic setting. The original dynamic I/O Automata formalism included operators for parallel composition, action hiding, action renaming, automaton creation, and behavioral sub-typing by means of trace inclusion. They can model mobility by using signature modification. They are also hierarchical: a dynamically changing system of interacting automata is itself modeled as a single automaton. Our work extends all these features to the probabilistic setting. Furthermore, we prove necessary and sufficient conditions to obtain the monotonicity of automata creation/destruction with implementation preorder. Our construction uses a novel proof technique based on homomorphism that can be of independent interest. Our work lays down the foundations for extending composable secure-emulation of Canetti et al. [Ran Canetti et al., 2007] to dynamic settings, an important tool towards the formal verification of protocols combining probabilistic distributed systems and cryptography in dynamic settings (e.g. blockchains, secure distributed computation, cybersecure distributed protocols, etc).
Cite as

Pierre Civit and Maria Potop-Butucaru. Dynamic Probabilistic Input Output Automata. In 36th International Symposium on Distributed Computing (DISC 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 246, pp. 15:1-15:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@InProceedings{civit_et_al:LIPIcs.DISC.2022.15,
  author =	{Civit, Pierre and Potop-Butucaru, Maria},
  title =	{{Dynamic Probabilistic Input Output Automata}},
  booktitle =	{36th International Symposium on Distributed Computing (DISC 2022)},
  pages =	{15:1--15:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-255-6},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{246},
  editor =	{Scheideler, Christian},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.DISC.2022.15},
  URN =		{urn:nbn:de:0030-drops-172064},
  doi =		{10.4230/LIPIcs.DISC.2022.15},
  annote =	{Keywords: Automata, Distributed Computing, Formal Verification, Dynamic systems}
}
Document
DOI: 10.4230/LIPIcs.DISC.2021.42
Game Theoretical Framework for Analyzing Blockchains Robustness

Authors: Paolo Zappalà, Marianna Belotti, Maria Potop-Butucaru, and Stefano Secci

Published in: LIPIcs, Volume 209, 35th International Symposium on Distributed Computing (DISC 2021)

Abstract
In this paper we propose a game theoretical framework in order to formally characterize the robustness of blockchains systems in terms of resilience to rational deviations and immunity to Byzantine behaviors. Our framework includes necessary and sufficient conditions for checking the immunity and resilience of games and an original technique for composing games that preserves the robustness of individual games. We prove the practical interest of our formal framework by characterizing the robustness of various blockchain protocols: Bitcoin (the most popular permissionless blockchain), Tendermint (the first permissioned blockchain used by the practitioners), Lightning Network, a side-chain protocol and a cross-chain swap protocol. For each one of the studied protocols we identify upper and lower bounds with respect to their resilience and immunity (expressed as no worse payoff than the initial state) face to rational and Byzantine behaviors.
Cite as

Paolo Zappalà, Marianna Belotti, Maria Potop-Butucaru, and Stefano Secci. Game Theoretical Framework for Analyzing Blockchains Robustness. In 35th International Symposium on Distributed Computing (DISC 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 209, pp. 42:1-42:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{zappala_et_al:LIPIcs.DISC.2021.42,
  author =	{Zappal\`{a}, Paolo and Belotti, Marianna and Potop-Butucaru, Maria and Secci, Stefano},
  title =	{{Game Theoretical Framework for Analyzing Blockchains Robustness}},
  booktitle =	{35th International Symposium on Distributed Computing (DISC 2021)},
  pages =	{42:1--42:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-210-5},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{209},
  editor =	{Gilbert, Seth},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.DISC.2021.42},
  URN =		{urn:nbn:de:0030-drops-148440},
  doi =		{10.4230/LIPIcs.DISC.2021.42},
  annote =	{Keywords: Blockchain protocols, Distributed algorithms, Game-theoretical modeling, Fault tolerance, Failure robustness}
}
Document
DOI: 10.4230/OASIcs.Tokenomics.2020.4
On Fairness in Committee-Based Blockchains

Authors: Yackolley Amoussou-Guenou, Antonella Del Pozzo, Maria Potop-Butucaru, and Sara Tucci-Piergiovanni

Published in: OASIcs, Volume 82, 2nd International Conference on Blockchain Economics, Security and Protocols (Tokenomics 2020)

Abstract
Committee-based blockchains are among the most popular alternatives of proof-of-work based blockchains, such as Bitcoin. They provide strong consistency (no fork) under classical assumptions, and avoid using energy-consuming mechanisms to add new blocks in the blockchain. For each block, these blockchains use a committee that executes Byzantine-fault tolerant distributed consensus to decide the next block they will add in the blockchain. Unlike Bitcoin, where there is only one creator per block, in committee-based blockchain any block is cooperatively created. In order to incentivize committee members to participate in the creation of new blocks, rewarding schemes have to be designed. In this paper, we study the fairness of rewarding in committee-based blockchains and we provide necessary and sufficient conditions on the system communication under which it is possible to have a fair reward mechanism.
Cite as

Yackolley Amoussou-Guenou, Antonella Del Pozzo, Maria Potop-Butucaru, and Sara Tucci-Piergiovanni. On Fairness in Committee-Based Blockchains. In 2nd International Conference on Blockchain Economics, Security and Protocols (Tokenomics 2020). Open Access Series in Informatics (OASIcs), Volume 82, pp. 4:1-4:15, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{amoussouguenou_et_al:OASIcs.Tokenomics.2020.4,
  author =	{Amoussou-Guenou, Yackolley and Del Pozzo, Antonella and Potop-Butucaru, Maria and Tucci-Piergiovanni, Sara},
  title =	{{On Fairness in Committee-Based Blockchains}},
  booktitle =	{2nd International Conference on Blockchain Economics, Security and Protocols (Tokenomics 2020)},
  pages =	{4:1--4:15},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-157-3},
  ISSN =	{2190-6807},
  year =	{2021},
  volume =	{82},
  editor =	{Anceaume, Emmanuelle and Bisi\`{e}re, Christophe and Bouvard, Matthieu and Bramas, Quentin and Casamatta, Catherine},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.Tokenomics.2020.4},
  URN =		{urn:nbn:de:0030-drops-135261},
  doi =		{10.4230/OASIcs.Tokenomics.2020.4},
  annote =	{Keywords: Blockchain, Consensus, Committee, Fairness, Proof-of-Stake, Reward, Selection}
}
Document
DOI: 10.4230/LIPIcs.OPODIS.2020.12
Rational Behaviors in Committee-Based Blockchains

Authors: Yackolley Amoussou-Guenou, Bruno Biais, Maria Potop-Butucaru, and Sara Tucci-Piergiovanni

Published in: LIPIcs, Volume 184, 24th International Conference on Principles of Distributed Systems (OPODIS 2020)

Abstract
We study the rational behaviors of participants in committee-based blockchains. Committee-based blockchains rely on specific blockchain consensus that must be guaranteed in presence of rational participants. We consider a simplified blockchain consensus algorithm based on existing or proposed committee-based blockchains that encapsulate the main actions of the participants: voting for a block, and checking its validity. Knowing that those actions have costs, and achieving the consensus gives rewards to committee members, we study using game theory how strategic participants behave while trying to maximize their gains. We consider different reward schemes, and found that in each setting, there exist equilibria where blockchain consensus is guaranteed; in some settings however, there can be coordination failures hindering consensus. Moreover, we study equilibria with trembling participants, which is a novelty in the context of committee-based blockchains. Trembling participants are rational that can do unintended actions with a low probability. We found that in presence of trembling participants, there exist equilibria where blockchain consensus is guaranteed; however, when only voters are rewarded, there also exist equilibria where validity can be violated.
Cite as

Yackolley Amoussou-Guenou, Bruno Biais, Maria Potop-Butucaru, and Sara Tucci-Piergiovanni. Rational Behaviors in Committee-Based Blockchains. In 24th International Conference on Principles of Distributed Systems (OPODIS 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 184, pp. 12:1-12:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{amoussouguenou_et_al:LIPIcs.OPODIS.2020.12,
  author =	{Amoussou-Guenou, Yackolley and Biais, Bruno and Potop-Butucaru, Maria and Tucci-Piergiovanni, Sara},
  title =	{{Rational Behaviors in Committee-Based Blockchains}},
  booktitle =	{24th International Conference on Principles of Distributed Systems (OPODIS 2020)},
  pages =	{12:1--12:16},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-176-4},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{184},
  editor =	{Bramas, Quentin and Oshman, Rotem and Romano, Paolo},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.OPODIS.2020.12},
  URN =		{urn:nbn:de:0030-drops-134973},
  doi =		{10.4230/LIPIcs.OPODIS.2020.12},
  annote =	{Keywords: BFT Consensus, Blockchains, Game Theory}
}
Document
Brief Announcement
DOI: 10.4230/LIPIcs.DISC.2020.49
Brief Announcement: Game Theoretical Framework for Analyzing Blockchains Robustness

Authors: Paolo Zappalà, Marianna Belotti, Maria Potop-Butucaru, and Stefano Secci

Published in: LIPIcs, Volume 179, 34th International Symposium on Distributed Computing (DISC 2020)

Abstract
Blockchains systems evolve in complex environments that mix classical patterns of faults (e.g crash faults, transient faults, Byzantine faults, churn) with selfish, rational or irrational behaviors typical to economical systems. In this paper we propose a game theoretical framework in order to formally characterize the robustness of blockchains systems in terms of resilience to rational deviations and immunity to Byzantine behaviors. Our framework includes necessary and sufficient conditions for checking the immunity and resilience of games and a new technique for composing games that preserves the robustness of individual games. We prove the practical interest of our formal framework by characterizing the robustness of three different protocols popular in blockchain systems: a HTLC-based payment scheme (a.k.a. Lightning Network), a side-chain protocol and a cross-chain swap protocol.
Cite as

Paolo Zappalà, Marianna Belotti, Maria Potop-Butucaru, and Stefano Secci. Brief Announcement: Game Theoretical Framework for Analyzing Blockchains Robustness. In 34th International Symposium on Distributed Computing (DISC 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 179, pp. 49:1-49:3, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@InProceedings{zappala_et_al:LIPIcs.DISC.2020.49,
  author =	{Zappal\`{a}, Paolo and Belotti, Marianna and Potop-Butucaru, Maria and Secci, Stefano},
  title =	{{Brief Announcement: Game Theoretical Framework for Analyzing Blockchains Robustness}},
  booktitle =	{34th International Symposium on Distributed Computing (DISC 2020)},
  pages =	{49:1--49:3},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-168-9},
  ISSN =	{1868-8969},
  year =	{2020},
  volume =	{179},
  editor =	{Attiya, Hagit},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.DISC.2020.49},
  URN =		{urn:nbn:de:0030-drops-131275},
  doi =		{10.4230/LIPIcs.DISC.2020.49},
  annote =	{Keywords: Blockchains, Game Theory, Byzantine-Altruistic-Rational behaviours}
}
Document
Complete Volume
DOI: 10.4230/OASIcs.Tokenomics.2019
OASIcs, Vol. 71, Tokenomics 2019, Complete Volume

Authors: Vincent Danos, Maurice Herlihy, Maria Potop-Butucaru, Julien Prat, and Sara Tucci-Piergiovanni

Published in: OASIcs, Volume 71, International Conference on Blockchain Economics, Security and Protocols (Tokenomics 2019)

Abstract
OASIcs, Vol. 71, Tokenomics 2019, Complete Volume
Cite as

International Conference on Blockchain Economics, Security and Protocols (Tokenomics 2019). Open Access Series in Informatics (OASIcs), Volume 71, pp. 1-192, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@Proceedings{danos_et_al:OASIcs.Tokenomics.2019,
  title =	{{OASIcs, Vol. 71, Tokenomics 2019, Complete Volume}},
  booktitle =	{International Conference on Blockchain Economics, Security and Protocols (Tokenomics 2019)},
  pages =	{1--192},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-108-5},
  ISSN =	{2190-6807},
  year =	{2020},
  volume =	{71},
  editor =	{Danos, Vincent and Herlihy, Maurice and Potop-Butucaru, Maria and Prat, Julien and Tucci-Piergiovanni, Sara},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.Tokenomics.2019},
  URN =		{urn:nbn:de:0030-drops-119634},
  doi =		{10.4230/OASIcs.Tokenomics.2019},
  annote =	{Keywords: OASIcs, Vol. 71, Tokenomics 2019, Complete Volume}
}
Document
Front Matter
DOI: 10.4230/OASIcs.Tokenomics.2019.0
Front Matter, Table of Contents, Preface, Conference Organization

Authors: Vincent Danos, Maurice Herlihy, Maria Potop-Butucaru, Julien Prat, and Sara Tucci-Piergiovanni

Published in: OASIcs, Volume 71, International Conference on Blockchain Economics, Security and Protocols (Tokenomics 2019)

Abstract
Front Matter, Table of Contents, Preface, Conference Organization
Cite as

International Conference on Blockchain Economics, Security and Protocols (Tokenomics 2019). Open Access Series in Informatics (OASIcs), Volume 71, pp. 0:i-0:xii, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@InProceedings{danos_et_al:OASIcs.Tokenomics.2019.0,
  author =	{Danos, Vincent and Herlihy, Maurice and Potop-Butucaru, Maria and Prat, Julien and Tucci-Piergiovanni, Sara},
  title =	{{Front Matter, Table of Contents, Preface, Conference Organization}},
  booktitle =	{International Conference on Blockchain Economics, Security and Protocols (Tokenomics 2019)},
  pages =	{0:i--0:xii},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-108-5},
  ISSN =	{2190-6807},
  year =	{2020},
  volume =	{71},
  editor =	{Danos, Vincent and Herlihy, Maurice and Potop-Butucaru, Maria and Prat, Julien and Tucci-Piergiovanni, Sara},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.Tokenomics.2019.0},
  URN =		{urn:nbn:de:0030-drops-119640},
  doi =		{10.4230/OASIcs.Tokenomics.2019.0},
  annote =	{Keywords: Front Matter, Table of Contents, Preface, Conference Organization}
}
Document
DOI: 10.4230/LIPIcs.OPODIS.2018.16
Correctness of Tendermint-Core Blockchains

Authors: Yackolley Amoussou-Guenou, Antonella Del Pozzo, Maria Potop-Butucaru, and Sara Tucci-Piergiovanni

Published in: LIPIcs, Volume 125, 22nd International Conference on Principles of Distributed Systems (OPODIS 2018)

Abstract
Tendermint-core blockchains (e.g. Cosmos) are considered today one of the most viable alternatives for the highly energy consuming proof-of-work blockchains such as Bitcoin and Ethereum. Their particularity is that they aim at offering strong consistency (no forks) in an open system combining two ingredients (i) a set of validators that generate blocks via a variant of Practical Byzantine Fault Tolerant (PBFT) consensus protocol and (ii) a selection strategy that dynamically selects nodes to be validators for the next block via a proof-of-stake mechanism. The exact assumptions on the system model under which Tendermint underlying algorithms are correct and the exact properties Tendermint verifies, however, have never been formally analyzed. The contribution of this paper is as follows. First, while formalizing Tendermint algorithms we precisely characterize the system model and the exact problem solved by Tendermint, then, we prove that in eventual synchronous systems a modified version of Tendermint solves (i) under additional assumptions, a variant of one-shot consensus for the validation of one single block and (ii) a variant of the repeated consensus problem for multiple blocks. These results hold even if the set of validators is hit by Byzantine failures, provided that for each one-shot consensus instance less than one third of the validators is Byzantine.
Cite as

Yackolley Amoussou-Guenou, Antonella Del Pozzo, Maria Potop-Butucaru, and Sara Tucci-Piergiovanni. Correctness of Tendermint-Core Blockchains. In 22nd International Conference on Principles of Distributed Systems (OPODIS 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 125, pp. 16:1-16:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{amoussouguenou_et_al:LIPIcs.OPODIS.2018.16,
  author =	{Amoussou-Guenou, Yackolley and Del Pozzo, Antonella and Potop-Butucaru, Maria and Tucci-Piergiovanni, Sara},
  title =	{{Correctness of Tendermint-Core Blockchains}},
  booktitle =	{22nd International Conference on Principles of Distributed Systems (OPODIS 2018)},
  pages =	{16:1--16:16},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-098-9},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{125},
  editor =	{Cao, Jiannong and Ellen, Faith and Rodrigues, Luis and Ferreira, Bernardo},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.OPODIS.2018.16},
  URN =		{urn:nbn:de:0030-drops-100764},
  doi =		{10.4230/LIPIcs.OPODIS.2018.16},
  annote =	{Keywords: Blockchain, Consensus, Proof-of-Stake, Fairness}
}
Document
Complete Volume
DOI: 10.4230/LIPIcs.OPODIS.2015
LIPIcs, Volume 46, OPODIS'15, Complete Volume

Authors: Emmanuelle Anceaume, Christian Cachin, and Maria Potop-Butucaru

Published in: LIPIcs, Volume 46, 19th International Conference on Principles of Distributed Systems (OPODIS 2015)

Abstract
LIPIcs, Volume 46, OPODIS'15, Complete Volume
Cite as

19th International Conference on Principles of Distributed Systems (OPODIS 2015). Leibniz International Proceedings in Informatics (LIPIcs), Volume 46, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)

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@Proceedings{anceaume_et_al:LIPIcs.OPODIS.2015,
  title =	{{LIPIcs, Volume 46, OPODIS'15, Complete Volume}},
  booktitle =	{19th International Conference on Principles of Distributed Systems (OPODIS 2015)},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-98-9},
  ISSN =	{1868-8969},
  year =	{2016},
  volume =	{46},
  editor =	{Anceaume, Emmanuelle and Cachin, Christian and Potop-Butucaru, Maria},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.OPODIS.2015},
  URN =		{urn:nbn:de:0030-drops-67174},
  doi =		{10.4230/LIPIcs.OPODIS.2015},
  annote =	{Keywords: Distributed Systems}
}
Document
Front Matter
DOI: 10.4230/LIPIcs.OPODIS.2015.0
Front Matter, Table of Contents, Preface, Committees, List of Authors

Authors: Emmanuelle Anceaume, Christian Cachin, and Maria Potop-Butucaru

Published in: LIPIcs, Volume 46, 19th International Conference on Principles of Distributed Systems (OPODIS 2015)

Abstract
Front Matter, Table of Contents, Preface, Committees, List of Authors
Cite as

19th International Conference on Principles of Distributed Systems (OPODIS 2015). Leibniz International Proceedings in Informatics (LIPIcs), Volume 46, pp. 0:i-0:xvi, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)

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@InProceedings{anceaume_et_al:LIPIcs.OPODIS.2015.0,
  author =	{Anceaume, Emmanuelle and Cachin, Christian and Potop-Butucaru, Maria},
  title =	{{Front Matter, Table of Contents, Preface, Committees, List of Authors}},
  booktitle =	{19th International Conference on Principles of Distributed Systems (OPODIS 2015)},
  pages =	{0:i--0:xvi},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-98-9},
  ISSN =	{1868-8969},
  year =	{2016},
  volume =	{46},
  editor =	{Anceaume, Emmanuelle and Cachin, Christian and Potop-Butucaru, Maria},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.OPODIS.2015.0},
  URN =		{urn:nbn:de:0030-drops-66223},
  doi =		{10.4230/LIPIcs.OPODIS.2015.0},
  annote =	{Keywords: Front Matter, Table of Contents, Preface, Committees, List of Authors}
}
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