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2017 | OriginalPaper | Buchkapitel

Accountable Privacy for Decentralized Anonymous Payments

verfasst von : Christina Garman, Matthew Green, Ian Miers

Erschienen in: Financial Cryptography and Data Security

Verlag: Springer Berlin Heidelberg

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Abstract

Decentralized ledger-based currencies such as Bitcoin provide a means to construct payment systems without requiring a trusted bank. Removing this trust assumption comes at the significant cost of transaction privacy. A number of academic works have sought to improve the privacy offered by ledger-based currencies using anonymous electronic cash (e-cash) techniques. Unfortunately, this strong degree of privacy creates new regulatory concerns, since the new private transactions cannot be subject to the same controls used to prevent individuals from conducting illegal transactions such as money laundering. We propose an initial approach to addressing this issue by adding privacy preserving policy-enforcement mechanisms that guarantee regulatory compliance, allow selective user tracing, and admit tracing of tainted coins (e.g., ransom payments). To accomplish this new functionality we also provide improved definitions for Zerocash and, of independent interest, an efficient construction for simulation sound zk-SNARKs.

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Vorheriges Kapitel Introducing Reputation Systems to the Economics of Outsourcing Computations to Rational Workers

Nächstes Kapitel Private eCash in Practice (Short Paper)

We note that this tax policy is ill defined if users collude to generate a transaction using MPC where the input identities are different. This can be fixed by ensuring that there is only one identity used for all input coins. However, the same MPC mechanism could be used to share one identity and never pay taxes.

It may be possible to reduce the cost of these proofs by introducing zero-knowledge proofs that are only partially extractable, although this technique is not described by the Hawk authors. For example, the exact Merkle tree path need not be extracted from the zkSNARK proof.

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Titel: Accountable Privacy for Decentralized Anonymous Payments
verfasst von: Christina Garman
Matthew Green
Ian Miers
Verlag: Springer Berlin Heidelberg
Buch: Financial Cryptography and Data Security
Print ISBN: 978-3-662-54969-8

Electronic ISBN: 978-3-662-54970-4

Copyright-Jahr: 2017
DOI: https://doi.org/10.1007/978-3-662-54970-4_5

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