ACM Distributed Ledger Technologies: Research and Practice, vol. 3, no. 4 is now available online - https://lnkd.in/gY3PrVK3 1) Characterizing the Performance and Cost of Blockchains on the Cloud and at the Edge, by Dumitrel Loghin, Anh Dinh, Chen Gang, Yong Meng Teo, Beng Chin OOI (National University of Singapore; Deakin University; Zhejiang University) 2) Blockchain Double Spending with Low Mining Power and Network Delays, by Chris N., Parinya Ekparinya, Guillaume Jourjon, Vincent Gramoli ( University of Sydney; CSIRO; EPFL) 3) Collaborative Construction Method of Biomedical Knowledge Graph Based on Multi-Blockchain, by Jinlong Wang, Zhenxi Xie, Hui Xin, Pengjun Li, Yuanyuan Zhang, Xiaoyun Xiong, Jerry Chun-Wei Lin (Qingdao University of Technology; Silesian University of Technology) 4) Cross-Blockchain Communication Using Oracles With an Off-Chain Aggregation Mechanism Based on zk-SNARKs, by Michael Sober, Giulia Scaffino, Stefan Schulte (Hamburg University of Technology; TU Wien) 5) Smart Contract Powered Framework for the Next Generation Industry 4.0 Business Model, by Denis Stefanescu, Leticia Montalvillo Mendizabal, Aitor Urbieta, Patxi Galán-García, Juan Jose Unzilla Galan (Ikerlan Technology Research Centre; Entrii; University of the Basque Country) 6) Enhancing e-KYC Security and Privacy: Harnessing Quantum Computing and Blockchain in Web 3.0, by G M Faruk Ahmed, CISSP, CISA, @Imran Hasan, Md Soumike Hassan, Rahul Khan, Abu Jor Al Gefari, Zain Buksh, Joseph Liu, A B M Shawkat Ali (Rupali Bank Limited; Islamic University; Jahangirnagar University Bangladesh University; Monash University, University of Fiji) 7) A BTN-Based Method for Multi-Entity Bitcoin Transaction Analysis and Influence Assessment, by Yan Wu, Liuyang Zhao, Jia Zhang, Leilei Shi, Lu Liu, John Panneerselvam (Jiangsu University; University of Exeter; University of Leicester) 8) A Systematic Review of Blockchain-Based Privacy-Preserving Reputation Systems for IoT Applications, by Haitham Mahmoud, Junaid A., Professor Adel Aneiba (Birmingham City University)