Consensus protocols are used for the distributed management of large databases in an
environment without trust among participants. The choice of a specific protocol depends on …

Permissioned blockchains take more reliability on participants than permissionless ones. In
this poster, we focus on a hierarchical scenario of permissioned blockchains, which includes …

We put forth the first decentralized communication mechanism between proof-of-work and
proof-of-stake blockchains, or combinations thereof. To construct it, we propose two new …

During the last decade, distributed ledger solutions such as blockchain have gained
significant attention due to their decentralized, immutable, and verifiable features. However …

In the last few years we have seen many different approaches to incorporate privacy
features to blockchains. In the area of cryptocurrencies that would normally mean protecting …

We present an energy-efficient, security-enhanced consensus algorithm to compensate for
the security weaknesses that may arise when a node that generates a block is vulnerable in …

Distributed applications that utilize heterogeneous blockchain systems have the potential to
be widely deployed. In such applications, users from different blockchains can transact with …

Blockchain and distributed ledger technologies have become key to develop secure
decentralized applications. Their potential applications span various industries and their use …

Scalability is one of the main roadblocks to business adoption of blockchain systems.
Despite recent intensive research on using sharding techniques to enhance the scalability of …

Blockchain serves as a replicated transactional processing system in a trustless distributed
environment. Existing blockchain systems all rely on an explicit ordering step to determine …