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Multi-party business processes rely on the collaboration of various playersin a decentralized setting. Blockchain technology can facilitate the automationof these processes, even in cases where trust among participants is limited.Transactions are stored in a ledger, a replica of which is retained by everynode of the blockchain network. The operations saved thereby are thus publiclyaccessible. While this enhances transparency, reliability, and persistence, ithinders the utilization of public blockchains for process automation as itviolates typical confidentiality requirements in corporate settings. In thispaper, we propose MARTSIA: A Multi-Authority Approach to Transaction Systemsfor Interoperating Applications. MARTSIA enables precise control over processdata at the level of message parts. Based on Multi-Authority Attribute-BasedEncryption (MA-ABE), MARTSIA realizes a number of desirable properties,including confidentiality, transparency, and auditability. We implemented ourapproach in proof-of-concept prototypes, with which we conduct a case study inthe area of supply chain management. Also, we show the integration of MARTSIAwith a state-of-the-art blockchain-based process execution engine to secure thedata flow.

MARTSIA: Enabling Data Confidentiality for Blockchain-based Process Execution