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2019 | OriginalPaper | Buchkapitel

PRCash: Fast, Private and Regulated Transactions for Digital Currencies

verfasst von : Karl Wüst, Kari Kostiainen, Vedran Čapkun, Srdjan Čapkun

Erschienen in: Financial Cryptography and Data Security

Verlag: Springer International Publishing

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Abstract

Fiat currency implemented as a blockchain can enable multiple benefits such as reduced cost compared to expensive handling of cash and better transparency for increased public trust. However, such deployments have conflicting requirements including fast payments, strong user privacy and regulatory oversight. None of the existing blockchain transaction techniques supports all of these three requirements. In this paper we design a new blockchain currency, called PRCash, that addresses the above challenge. The primary technical contribution of our work is a novel regulation mechanism for transactions that use cryptographic commitments. We enable regulation of spending limits using zero-knowledge proofs. PRCash is the first blockchain currency that provides fast payments, good level of user privacy and regulatory control at the same time.

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Vorheriges Kapitel Short Paper: An Empirical Analysis of Monero Cross-chain Traceability

Nächstes Kapitel ZLiTE: Lightweight Clients for Shielded Zcash Transactions Using Trusted Execution

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Matching transaction inputs to outputs after reordering is in general already an NP-complete problem (subset sum). However, most transactions will only have few inputs and outputs, which can make linking feasible in practice without this additional measure.

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Titel: PRCash: Fast, Private and Regulated Transactions for Digital Currencies
verfasst von: Karl Wüst
Kari Kostiainen
Vedran Čapkun
Srdjan Čapkun
Verlag: Springer International Publishing
Buch: Financial Cryptography and Data Security
Print ISBN: 978-3-030-32100-0

Electronic ISBN: 978-3-030-32101-7

Copyright-Jahr: 2019
DOI: https://doi.org/10.1007/978-3-030-32101-7_11

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