Existing permissioned blockchains often rely on coordination-based consensus protocols to
ensure the safe execution of applications in a Byzantine environment. Furthermore, the …

Sybil attacks, in which a large number of adversary-controlled nodes join a network, are a
concern for many peer-to-peer database systems, necessitating expensive …

Schema evolution is a pervasive challenge in distributed systems. Developers often resort to
ad hoc solutions that mix compatibility concerns with application code. We propose a …

In distance education courses with a large number of students and groups, the organization
and facilitation of collaborative writing tasks are challenging. Teachers need support for …

In this keynote I give a subjective but systematic overview of the landscape of distributed
event-based systems, with an emphasis on two areas I have worked on over the last …

I propose a design for versioned collaborative documents. Versioned collaborative
documents combine Google Docs-style real-time collaboration with git-style fork-merge …

Making web applications run in a decentralized though collaborative way, with connectivity
disruptions, is a challenging task. Opportunistic networking offers a way to be independent …

Conflict-free Replicated Data Types (CRDTs) are data structures that are supposed to make
multi-user applications easier to develop. In this paper, we describe our initial insights from a …

To achieve high availability, large-scale distributed systems have to replicate data and to
minimise coordination between nodes. Literature and industry increasingly adopt …

Distributed systems are currently evolving from a centralized client-server architecture to
decentralized, web-based architectures. Decentralized systems use replication techniques …