Private permissioned blockchains are becoming gradually more sought-after. Such systems
are reachable by authorized users, and tend to be completely transparent to whoever …

Existing (popular) blockchain architectures, including the widely used Ethereum and
Hyperledger, are generally not designed to achieve conflicting properties such as anonymity …

In this paper we address the issue of identity and access control within shared permissioned
blockchains. We propose the ChainAchor system that provides anonymous but verifiable …

Consensus algorithms play an essential role in blockchains, directly impacting their
performance. These algorithms involve validating and ordering pending transactions into …

Privacy in blockchains is rather complicated as it contradicts with some highly praised
properties of blockchain such as immutability. Immutability is considered a cornerstone of …

With the release of Satoshi Nakamoto's Bitcoin system in 2008 a new decentralized
computation paradigm, known as blockchain, was born. Bitcoin promised a trading network …

Permissionless blockchains are decentralized and scalable, but they are extremely slow in
transactional processing and are wasteful of computation resource. Permissioned …

Fabric is a modular and extensible open-source system for deploying and operating
permissioned blockchains and one of the Hyperledger projects hosted by the Linux …

Scalability remains one of the biggest challenges to the adoption of permissioned
blockchain technologies for large-scale deployments. Namely, permissioned blockchains …

As a subset of distributed systems, blockchain technology is equally bound by the CAP
trilemma. Specifically, no distributed system can satisfy consistency, availability, and …