Blockchain has been praised for its capacity to hold data in a decentralized and tamper-proof way. It also supports the execution of code through blockchain's smart contracts, adding automation of actions to the network with high trustability. However, as smart contracts are visible by anybody on the network, the business data and logic may be at risk, thus companies could be reluctant to use such technology. This paper aims to propose a pattern that allows the execution of automatable legal contract clauses, where its execution states are stored in an on-chain smart-contract and the logic needed to enforce it wraps it off-chain. An engine completes this pattern by running a business process that corresponds to the legal contract. We then propose a pattern-based solution based on a real-life use case: transportation of refrigerated goods. We argue that this pattern guarantees companies pseudonymity and data confidentiality while ensuring that an audit trail can be reconstituted through the blockchain smart-contract to identify misbehavior or errors. This paper paves the way for a future possible implementation of the solution described, as well as its evaluation.

中文翻译：

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基于区块链的机密和伪匿名合同执行模式

区块链以分散和防篡改的方式保存数据的能力而受到赞誉。它还支持通过区块链的智能合约执行代码，以高度可信赖的方式向网络添加动作自动化。但是，由于智能合约对网络上的任何人都是可见的，因此业务数据和逻辑可能会受到威胁，因此公司可能不愿意使用此类技术。本文旨在提出一种模式，该模式允许执行可自动化的法律合同条款，其中其执行状态存储在链上智能合约中，执行该合约所需的逻辑将其包裹在链下。引擎通过运行与合法合同相对应的业务流程来完成此模式。然后，我们基于现实的用例提出一种基于模式的解决方案：冷藏货物的运输。我们认为，这种模式可确保公司具有匿名性和数据机密性，同时确保可以通过区块链智能合约重构审计线索，以识别不良行为或错误。本文为所述解决方案的未来实现及其评估铺平了道路。