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Felley, and S. \u010capkun,\u201cTls-n: non-repudiation over tls enablign ubiquitous content signing,\u201d NDSS, 2018. 10.14722\/ndss.2018.23272","DOI":"10.14722\/ndss.2018.23272"},{"key":"10","doi-asserted-by":"crossref","unstructured":"[10] J. Guarnizo and P. Szalachowski, \u201cPdfs: practical data feed service for smart contracts,\u201d European Symposium on Research in Computer Security, pp.767-789, Springer, 2019. 10.1007\/978-3-030-29959-0_37","DOI":"10.1007\/978-3-030-29959-0_37"},{"key":"11","doi-asserted-by":"crossref","unstructured":"[11] A. Kosba, A. Miller, E. Shi, Z. Wen, and C. Papamanthou, \u201cHawk: The blockchain model of cryptography and privacy-preserving smart contracts,\u201d 2016 IEEE Symposium on Security and Privacy (SP), 2016. 10.1109\/sp.2016.55","DOI":"10.1109\/SP.2016.55"},{"key":"12","unstructured":"[12] M. 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