Blockchain technology enables several untrustworthy parties to execute inter-organizational business processes in a tamper-proof manner. Existing approaches are based on smart contract code generation. Although the smart contract immutability guarantees that the process model is followed by each participant, any change in the process model makes the existing process instance smart contract not compliant with the process model and therefore, the deployment of a new smart contract becomes a requirement. In this paper, we propose CoBuP, a decentralized Collaborative Business Process execution architecture using blockchain. To address the inflexibility issue, this paper presents an interpreter of BPMN process models, supporting the instantiating, execution, monitoring of process instances. For this reason, one generic smart contract is deployed once, which helps generate a process instance, create BPMN elements by invoking the process instance predefined functions, and dynamically update the adaptation of a process at run time. For validation purposes, two use cases have permitted to carry out different experiments that demonstrate the technical feasibility of our approach. The obtained results of the experimental evaluation shows that our approach cost is similar or lower than that of the existing approaches.

区块链技术使多个不可信方能够以防篡改的方式执行组织间业务流程。现有方法基于智能合约代码生成。虽然智能合约的不变性保证了每个参与者都遵循流程模型，但流程模型的任何变化都会使现有流程实例智能合约与流程模型不兼容，因此需要部署新的智能合约。在本文中，我们提出了 CoBuP，一种使用区块链的去中心化协作业务流程执行架构。为了解决不灵活的问题，本文提出了一个解释器BPMN 流程模型，支持流程实例的实例化、执行、监控。出于这个原因，一个通用智能合约被部署一次，这有助于生成流程实例，通过调用流程实例预定义函数创建 BPMN 元素，并在运行时动态更新流程的适配。出于验证目的，两个用例允许进行不同的实验，以证明我们方法的技术可行性。实验评估的结果表明，我们的方法成本与现有方法相似或更低。