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Elastic and cost-effective data carrier architecture for smart contract in blockchain

机译：弹性，经济高效的数据载体架构，适用于区块链中的智能合约

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Smart contract, which could help developer deploy decentralized and secure blockchain application, is one of the most promising technologies for modern Internet of things (IoT) ecosystem today. However, Ethereum smart contract lacks of ability to communicate with outside IoT environment. To enable smart contracts to fetch off-chain data, this paper proposes a data carrier architecture that is cost-effective and elastic for blockchain-enabled IoT environment. Three components, namely Mission Manager, Task Publisher and Worker, are presented in the data carrier architecture to interact with contract developer, smart contract, Ethereum node and off-chain data sources. Selective solutions are also proposed for filtering smart contract event and decoding event log to fit different requirements. The evaluation results and discussions show the proposed system will decrease about 20USD deployment cost in average for every smart contract, and it is more efficient and elastic compared with Oraclize Oracle data carrier service. (C) 2019 Elsevier B.V. All rights reserved.
机译：智能合约可以帮助开发人员部署去中心化和安全的区块链应用程序，它是当今现代物联网（IoT）生态系统中最有前途的技术之一。但是，以太坊智能合约缺乏与外部物联网环境通信的能力。为了使智能合约能够获取链下数据，本文提出了一种数据载体架构，该架构对于启用了区块链的物联网环境而言具有成本效益且具有弹性。数据载体体系结构中介绍了三个组件，即任务管理器，任务发布者和工作程序，以与合同开发者，智能合同，以太坊节点和链下数据源进行交互。还提出了选择性解决方案，用于筛选智能合约事件和解码事件日志以适应不同的需求。评估结果和讨论表明，提出的系统将为每个智能合约平均减少约20美元的部署成本，并且与Oraclize Oracle数据载体服务相比，该系统效率更高且更具弹性。 （C）2019 Elsevier B.V.保留所有权利。

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