Twilight: A Differentially Private Payment Channel Network with Saar Tochner | a16z crypto research
Source: YouTube · a16z crypto · published Dec 16, 2022 · 52:34
Twilight is a differentially private payment channel network that protects against probing attacks while maintaining high throughput 9:26-9:33.
Key Takeaways:
• Payment channel networks like Lightning enable off-chain transactions but are vulnerable to probing attacks where attackers can learn channel liquidity information for free 6:13-6:22
• Twilight uses differential privacy with a tree-based noise generation approach that limits how many different observations an attacker can get about the same payment 13:36-13:48
• The system enforces privacy through trusted execution environments (TEEs) that ensure relays follow the protocol since they wouldn't voluntarily implement privacy measures that reduce their potential revenue 35:55-36:05
• While requiring additional locked funds (around 9500 units for hiding payments of size 1), the economic analysis shows this is viable at approximately 1% fee compared to Visa's 2.5% and American Express's 4% 28:55-29:16
• The implementation achieved 850 payments per second with under one second latency for four-hop payments, outperforming Lightning Network's theoretical 350 payments per second 43:37-43:49
The system provides strong privacy guarantees while maintaining practical performance for real-world payment networks 49:15-49:18.
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First 800 characters of the transcript
so hi everyone um this talk is going to present a paper that just was got accepted to use Nick's security like we presented two weeks ago there I think um I really like this paper because it spans through many different topic topics so like in every groups that I presented to has different kind of questions so just feel free to talk and to interact with any questions because this is I really want you to understand it deeply um so the paper is called Twilight the differentially private payment Channel network and this is a joint work with my adotaniosar we all from the Hebrew universities okay so a bit about myself and PhD student finishing my PhD at the Ava University of Jerusalem I have a lot of different papers in the area of cryptocurrencies um Twilight is the paper that I'm going to pr…