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Channels: Horizontal Scaling and Confidentiality on Permissioned Blockchains

Eleftherios Kokoris Kogias, Christian Cachin

Sharding, or partitioning the system's state so that different subsets of participants handle it, is a proven approach to building distributed systems whose total capacity scales horizontally with the number of participants. Many distributed ledgers have adopted this approach to increase their performance, however, they focus on the permissionless setting that assumes the existence of a strong adversary. In this paper, we deploy channels for permissioned blockchains. Our first contribution is to adapt sharding on asset-management applications for the permissioned setting, while preserving liveness and safety even on transactions spanning across-channels. Our second contribution is to leverage channels as a confidentiality boundary, enabling different organizations and consortia to preserve their privacy within their channels and still be part of a bigger collaborative ecosystem. To make our system concrete we map it on top of Hyperledger Fabric.

SPRINGER INTERNATIONAL PUBLISHING AG2018

Channels: Horizontal Scaling and Confidentiality on Permissioned Blockchains with Application on Hyperledger Fabric

Eleftherios Kokoris Kogias, Christian Cachin

Sharding, or partitioning the system’s state so that different subsets of participants handle it, is a proven approach to building distributed systems whose total capacity scales horizontally with the number of participants. Many distributed ledgers have adopted this approach to increase their performance, however, they focus on the permissionless setting that assumes the existence of a strong adversary. In this paper, we deploy channels for permissioned blockchains. Our first contribution is to adapt sharding on asset-management applications for the permissioned setting, while preserving liveness and safety even on transactions spanning across-channels. Our second contribution is to leverage channels as a confidentiality boundary, enabling different organizations and consortia to preserve their privacy within their channels and still be part of a bigger collaborative ecosystem. To make our system concrete we map it on top of Hyperledger Fabric.

2018

Introduction to Reliable and Secure Distributed Programming

Rachid Guerraoui, Christian Cachin

This book provides an introduction to distributed programming abstractions and presents the fundamental algorithms that implement them in several distributed en- vironments. The reader is given insight into the important problems of distributed computing and the main algorithmic techniques used to solve these problems. Through examples the reader can learn how these methods can be applied to build- ing distributed applications. The central theme of the book is the tolerance to uncertainty and adversarial influence in a distributed system, which may arise from network delays, faults, or even malicious attacks.

Springer2011