IEEE/ACM International Symposium on Quality of Service (IWQoS) 2021
Revisiting Double-Spending Attacks on the Bitcoin Blockchain: New Findings
Jian Zheng, Huawei Huang and Canlin Li (Sun Yat-Sen University, China); Zibin Zheng (Sun Yat-sen University, China); Song Guo (The Hong Kong Polytechnic University, Hong Kong)
BESURE: Blockchain-Based Cloud-Assisted eHealth System with Secure Data Provenance
Shiyu Li, Yuan Zhang and ChunXiang Xu (University of Electronic Science and Technology of China, China); Nan Cheng (Xidian University, China); Zhi Liu (The University of Electro-Communications, Japan); Sherman Shen (University of Waterloo, Canada)
Cumulus: A Secure BFT-based Sidechain for Off-chain Scaling
Fangyu Gai (University of British Columbia, Canada); Jianyu Niu (The University of British Columbia, Canada); Seyed Ali Tabatabaee, Chen Feng and Mohammad Jalalzai (University of British Columbia, Canada)
This paper presents Cumulus, a novel BFT-based sidechain framework for blockchains to achieve off-chain scaling without compromising any security and efficiency properties of both sides' consensus protocols. Cumulus encompasses a novel cryptographic sortition algorithm called Proof-of-Wait to fairly select sidechain nodes to communicate with the mainchain in an efficient and decentralized manner. To further reduce the operational cost, Cumulus provides an optimistic checkpointing approach in which the mainchain will not verify checkpoints unless disputes happen. Meanwhile, end-users enjoy a two-step withdrawal protocol, ensuring that they can safely collect assets back to the mainchain without relying on the BFT committee. Our experiments show that Cumulus sidechains outperform ZK-Rollup, another promising sidechain construction, achieving one and two orders of magnitude improvement in throughput and latency while retaining comparable operational cost.
Robust P2P Connectivity Estimation for Permissionless Bitcoin Network
Hsiang-Jen Hong, Wenjun Fan and Simeon Wuthier (University of Colorado Colorado Springs, USA); Jinoh Kim (Texas A&M University-Commerce, USA); Xiaobo Zhou (University of Colorado, Colorado Springs, USA); C. Edward Chow (University of Colorado at Colorado Springs, USA); Sang-Yoon Chang (University of Colorado Colorado Springs, USA)
Automated Quality of Service Monitoring for 5G and Beyond Using Distributed Ledgers
Tooba Faisal (Kings College London, United Kingdom (Great Britain)); Damiano Di Francesco Maesa (University of Cambridge & Istituto di Informatica e Telematica, Consiglio Nazionale delle Ricerche, United Kingdom (Great Britain)); Nishanth Sastry (University of Surrey, United Kingdom (Great Britain)); Simone Mangiante (Vodafone, United Kingdom (Great Britain))
In this work, we present a novel end-to-end architecture making the contractual process transparent and accountable. Our architecture borrows inherent properties of emerging Distributed Ledger Technologies (DLTs) to replace today's manual negotiation of service level agreements with an automated process based on smart contracts. This automation allows service levels to be agreed upon just-in-time, a few minutes before service is needed, and for this agreement to be in place for a limited well-defined duration. This clarity and immediacy allows mobile operators to introspect the currently available capacities in their network and make hard resource reservations, thereby providing firm service level guarantees. We also develop a overhead solution, based on cryptographically secure bloom filters, that makes it possible to monitor and enforce at run time the QoS levels which have been agreed upon.
Coded Matrix Chain Multiplication
Xiaodi Fan (CUNY Graduate Center); Angel Saldivia (Florida International University, USA); Pedro Soto (CUNY Graduate Center); Jun Li (City University of New York, USA)
Aniruddh Rao Kabbinale, Samsung R&D institute India - Bangalore