Intro
Preface
Organization
Contents
Blockchain Forum
Preface
Blockchain Forum
Organization
Program Chairs
Program Committee
Blockchain for Business Process Enactment: A Taxonomy and Systematic Literature Review
1 Introduction
1.1 Blockchain-Based Business Process Enactment
1.2 Related Work
2 Methodology
2.1 Taxonomy Development
2.2 Systematic Literature Review
3 A Taxonomy of Blockchain-Based Enactment
3.1 Overview
3.2 Dimensions and Classification Results
4 Discussion: Challenges and Future Research Directions

4.1 Interoperability
4.2 Traceability and Correctness
4.3 Flexibility and Scalability
5 Conclusion and Outlook
References
Pupa: Smart Contracts for BPMN with Time-Dependent Events and Inclusive Gateways
1 Introduction
2 Background and Related Works
2.1 Background on Smart Contracts
2.2 Background on BPMN
2.3 Background on Timer Events
2.4 Background on Inclusive Gateways
2.5 Related Works on Process-Oriented Smart Contract Solution
2.6 Related Works on Timer Events
2.7 Related Works on Inclusive Gateways
3 Details of the Proposed Solution

3.1 Handling Time-Dependent Events
3.2 Supporting Inclusive Gateways
4 Use Case Study
5 Result and Evaluation
5.1 Compiling and Deploying New Smart Contracts
5.2 Gas and Performance Evaluation
6 Conclusion
References
A Systematic Local Fork Management Framework for Blockchain Sandbox Environments
1 Introduction
2 Preliminaries
3 Related Work
4 Proposed Framework
4.1 Scope
4.2 High Level Overview
4.3 Components
4.4 Features
5 Use Cases
6 Implementation
7 Discussion, Limitations and Future Work
8 Conclusion
References

Fine-Grained Data Access Control for Collaborative Process Execution on Blockchain
1 Introduction
2 Running Example and Problem Illustration
3 Background
4 The CAKE Approach
5 Implementation and Evaluation
6 Related Work
7 Conclusion and Future Remarks
References
Challenges and Opportunities of Blockchain for Auditable Processes in the Healthcare Sector
1 Introduction
2 Background and Related Work
2.1 Blockchain in Business Process Management
2.2 Applications of Blockchain Technology for FL in Healthcare

3 Use Case: Auditable Consent Management for Federated Machine Learning in Healthcare
3.1 Use Case Description, Roles and Workflow
3.2 Requirement Analysis
3.3 Threat Model
4 System Design
4.1 Governance Framework, DPKI and Identities
4.2 Verifiable Consent Management Process
4.3 Federated ML Execution
4.4 Implementation
5 Insights, Applications, and Future Research Challenges
References
Measuring the Effects of Confidants on Privacy in Smart Contracts
1 Introduction
2 Related Work
3 Process Meta Model
3.1 Example Process
3.2 Privity Spheres