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In the industry, blockchains are increasingly used as the backbone of productand process traceability. Blockchain-based traceability participates in thedemonstration of product and/or process compliance with existing safetystandards or quality criteria. In this perspective, services and applicationsbuilt on top of blockchains are business-critical applications, because anintended failure or corruption of the system can lead to an importantreputation loss regarding the products or the processes involved. Thedevelopment of a blockchain-based business-critical application must be thenconducted carefully, requiring a thorough justification of its dependabilityand security. To this end, this paper encourages an engineering perspectiverooted in well-understood tools and concepts borrowed from the engineering ofsafety-critical systems. Concretely, we use a justification framework, calledCAE (Claim, Argument, Evidence), by following an approach based on assurancecases, in order to provide convincing arguments that a business-criticalblockchain-based application is dependable and secure. The application of thisapproach is sketched with a case study based on the blockchain HYPERLEDGERFABRIC.

Justifying the Dependability and Security of Business-Critical Blockchain-based Applications