Searched for: +
(1 - 20 of 40)

Pages

List view
Grid view
document
de Vos, M.A. (author), Ishmaev, G. (author), Pouwelse, J.A. (author)
The popularity of blockchain technology has bootstrapped many “Web3” applications, e.g., Ethereum and IPFS, that apply distributed ledger technology to store transactions. The amount of transactions generated and stored in such Web3 applications is significant and, in its raw form, usually not searchable by users. Existing Web3 transaction...
journal article 2024
document
Stokkink, Q.A. (author), Ileri, Can Umut (author), Epema, D.H.J. (author), Pouwelse, J.A. (author)
Web3 is emerging as the new Internet-interaction model that facilitates direct collaboration between strangers without a need for prior trust between network participants and without central authorities. However, one of its shortcomings is the lack of a defense mechanism against the ability of a single user to generate a surplus of identities,...
journal article 2023
document
de Vos, M.A. (author), Ishmaev, G. (author), Pouwelse, J.A. (author), Roos, S. (author)
Catalyzed by the popularity of blockchain technology, there has recently been a renewed interest in the design, implementation and evaluation of decentralized systems. Most of these systems are intended to be deployed at scale and in heterogeneous environments with real users and unpredictable workloads. Nevertheless, most research in this field...
conference paper 2023
document
Nasrulin, B. (author), Ishmaev, G. (author), Decouchant, Jérémie (author), Pouwelse, J.A. (author)
Manipulation of user transactions by miners in permissionless blockchain systems is a growing concern. This problem is a pervasive and systemic issue that incurs high costs for users of decentralised applications and is known as Miner Extractable Value (MEV). Furthermore, transaction manipulations create other issues such as congestion,...
conference paper 2023
document
Chotkan, R.M. (author), Decouchant, Jérémie (author), Pouwelse, J.A. (author)
Decentralised Autonomous Organisations (DAOs) have the capability of being a disruptive Web3 technology. Their usage of cryptographically secure distributed ledgers shows promise of replacing existing technical and financial intermediaries. However, this promise has not been fully materialised yet: existing attempts typically rely on...
conference paper 2022
document
Nasrulin, B. (author), Ishmaev, G. (author), Pouwelse, J.A. (author)
Decentralized reputation schemes present a promising area of experimentation in blockchain applications. These solutions aim to overcome the shortcomings of simple monetary incentive mechanisms of naive tokenomics. However, there is a significant research gap regarding the limitations and benefits of such solutions. We formulate these trade-offs...
conference paper 2022
document
Chotkan, R.M. (author), Decouchant, Jérémie (author), Pouwelse, J.A. (author)
Self-Sovereign Identity (SSI) aspires to create a standardised identity layer for the Internet by placing citizens at the centre of their data, thereby weakening the grip of big tech on current digital identities. However, as millions of both physical and digital identities are lost annually, it is also necessary for SSIs to possibly be revoked...
conference paper 2022
document
Stokkink, Q.A. (author), Ileri, Can Umut (author), Pouwelse, J.A. (author)
Web3 networks are emerging to replace centrally-governed networking infrastructure. The integrity of the shared public infrastructure of Web3 networks is guaranteed through data sharing between nodes. However, due to the unstructured and highly partitioned nature of Web3 networks, data sharing between nodes in different partitions is a...
conference paper 2022
document
de Vos, M.A. (author), Ishmaev, G. (author), Pouwelse, J.A. (author)
The landscape of electronic marketplaces has been monopolized by a handful of market operators that have accumulated tremendous power during the last decades. This trend raises concerns about fairness and market manipulation by these operators acting as gatekeepers. These concerns have recently been outlined in the EU Digital Markets Act (DMA...
journal article 2022
document
Nasrulin, B. (author), de Vos, M.A. (author), Ishmaev, G. (author), Pouwelse, J.A. (author)
The growing number of implementations of blockchain systems stands in stark contrast with still limited research on a systematic comparison of performance characteristics of these solutions. Such research is crucial for evaluating fundamental trade-offs introduced by novel consensus protocols and their implementations. These performance...
conference paper 2022
document
Rodrigo Valero, P. (author), Pouwelse, J.A. (author), de Vos, M.A. (author)
Non-Fungible Tokens (NFTs) leverage blockchain technology to certify and transfer ownership of digital assets to individuals. NFTs on the Ethereum blockchain have garnered significant attention recently, with a trading volume of over $2 billion in Q1 2021 only. At the same time, established NFT solutions have low flexibility, limited...
conference paper 2021
document
Nasrulin, B. (author), Pouwelse, J.A. (author)
Decentralized systems offer alternatives to Big Tech. However, maintaining availability and correctness despite faults and manipulations in decentralized settings is challenging. In this paper, we introduce a collaborative model that is capable of exposing all observable lying, all cheating, and all faults, while only requiring merely...
conference paper 2021
document
Stannat, A.W. (author), Ileri, Can Umut (author), Gijswijt, Dion (author), Pouwelse, J.A. (author)
In a multi-agent system where agents provide quantifiable work for each other on a voluntary basis, reputation mechanisms are incorporated to induce cooperation. Hereby agents assign their peers numerical scores based on their reported transaction histories. In such systems, adversaries can launch an attack by creating fake identities called...
conference paper 2021
document
de Vos, M.A. (author), Ileri, Can Umut (author), Pouwelse, J.A. (author)
Permissioned blockchains are increasingly being used as a solution to record transactions between companies. Several use cases that leverage permissioned blockchains focus on the representation and management of real-world assets. Since the number of incompatible blockchains is quickly growing, there is an increasing need for a universal...
journal article 2021
document
de Vos, M.A. (author), Pouwelse, J.A. (author)
“Big Tech” companies provide digital services used by billions of people. Recent developments, however, have shown that these companies often abuse their unprecedented market dominance for selfish interests. Meanwhile, decentralized applications without central authority are gaining traction. Decentralized applications critically depend on...
journal article 2021
document
de Vos, M.A. (author), Pouwelse, J.A. (author)
Preventing the abuse of resources is a crucial requirement in shared-resource systems. This concern can be addressed through a centralized gatekeeper, yet it enables manipulation by the gatekeeper itself. We present ConTrib, a decentralized mechanism for tracking resource usage across different shared-resource systems. In ConTrib,...
conference paper 2020
document
Pouwelse, J.A. (author)
Dependence of our society on digital infrastructures is growing daily, confronting us with an urgent task of building ethical and democratic alternatives to monopolistic big-tech platforms. We call upon the scientific community to put our talents to this challenge by creating decentralised infrastructures for trust-based economic and social...
conference paper 2020
document
de Vos, M.A. (author), Ishmaev, G. (author), Pouwelse, J.A. (author)
Matchmaking is a core enabling element in peer-to-peer markets. To date, matchmaking is predominantly performed by proprietary algorithms, fully controlled by market operators. This raises fairness concerns as market operators effectively can hide, prioritize, or delay the orders of specific users. Blockchain technology has been proposed as an...
conference paper 2020
document
Stokkink, Q.A. (author), Stannat, A.W. (author), Pouwelse, J.A. (author)
Successful classification of good or bad behavior in the digital domain is limited to central governance, as can be seen with trading platforms, search engines and news feeds. We explore and consolidate existing work on decentralized reputation systems to form a common denominator for what makes a reputation system successful when applied...
conference paper 2020
document
Otte, P.J. (author), de Vos, M.A. (author), Pouwelse, J.A. (author)
TrustChain is capable of creating trusted transactions among strangers without central control. This enables new areas of blockchain use with a focus on building trust between individuals. Our innovative approach offers scalability, openness and Sybil-resistance while replacing proof-of-work with a mechanism to establish the validity and...
journal article 2020
Searched for: +
(1 - 20 of 40)

Pages

List view
Grid view