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Twilight: A Differentially Private Payment Channel Network

Authors: 

Maya Dotan, Saar Tochner, Aviv Zohar, and Yossi Gilad, The Hebrew
University of Jerusalem

Abstract: 

Payment channel networks (PCNs) provide a faster and cheaper
alternative to transactions recorded on the blockchain. Clients can
trustlessly establish payment channels with relays by locking coins
and then send signed payments that shift coin balances over the
network's channels. Although payments are never published, anyone can
track a client's payment by monitoring changes in coin balances over
the network's channels. We present Twilight, the first PCN that
provides a rigorous differential privacy guarantee to its users.
Relays in Twilight run a noisy payment processing mechanism that
hides the payments they carry. This mechanism increases the relay's
cost, so Twilight combats selfish relays that wish to avoid it, using
a trusted execution environment (TEE) that ensures they follow its
protocol. The TEE does not store the channel's state, which minimizes
the trusted computing base. Crucially, Twilight ensures that even if
a relay breaks the TEE's security, it cannot break the integrity of
the PCN. We analyze Twilight in terms of privacy and cost and study
the trade-off between them. We implement Twilight using Intel's SGX
framework and evaluate its performance using relays deployed on two
continents. We show that a route consisting of 4 relays handles 820
payments/sec.

Maya Dotan, The Hebrew University of Jerusalem

Saar Tochner, The Hebrew University of Jerusalem

Aviv Zohar, The Hebrew University of Jerusalem

Yossi Gilad, Hebrew University of Jerusalem

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[usenix-loc]
BibTeX
@inproceedings {281326,
author = {Maya Dotan and Saar Tochner and Aviv Zohar and Yossi
Gilad},
title = {Twilight: A Differentially Private Payment Channel Network},
booktitle = {31st USENIX Security Symposium (USENIX Security 22)},
year = {2022},
isbn = {978-1-939133-31-1},
address = {Boston, MA},
pages = {555--570},
url = {https://www.usenix.org/conference/usenixsecurity22/
presentation/dotan},
publisher = {USENIX Association},
month = aug,
}
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