Mühlberger, Roman, Bachhofner, Stefan, Castelló Ferrer, Eduardo, Di Ciccio, Claudio, Weber, Ingo, Wöhrer, Maximilian, Zdun, Uwe. 2020. Foundational Oracle Patterns: Connecting Blockchain to the Off-Chain World. In Business Process Management: Blockchain and Robotic Process Automation Forum, Hrsg. Springer Nature Switzerland, 35-51. Sevilla: None.

RIS

@INPROCEEDINGS{Mühlberger2020,
title = {Foundational Oracle Patterns: Connecting Blockchain to the Off-Chain World},
author = {Roman Mühlberger and Stefan Bachhofner and Eduardo Castelló Ferrer and Claudio Di Ciccio and Ingo Weber and Maximilian Wöhrer and Uwe Zdun},
publisher = {None},
year = {2020},
address = {Sevilla},
url = {http://link.springer.com/content/pdf/10.1007/978-3-030-58779-6_3},
language = {EN},
pages = {35-51},
series = {Business Process Management: Blockchain and Robotic Process Automation Forum},
abstract = {Blockchain has evolved into a platform for decentralizedapplications, with beneficial properties like high integrity, transparency,and resilience against censorship and tampering. However, blockchainsare closed-world systems which do not have access to external state. Toovercome this limitation, oracles have been introduced in various formsand for different purposes. However so far common oracle best prac-tices have not been dissected, classified, and studied in their fundamen-tal aspects. In this paper, we address this gap by studying foundationalblockchain oracle patterns in two foundational dimensions characteris-ing the oracles: (i) the data flow direction, i.e., inbound and outbounddata flow, from the viewpoint of the blockchain; and (ii) the initiatorof the data flow, i.e., whether it is push or pull-based communication.We provide a structured description of the four patterns in detail, anddiscuss an implementation of these patterns based on use cases. On thisbasis we conduct a quantitative analysis, which results in the insight thatthe four different patterns are characterized by distinct performance andcosts profiles.},
}