Does Monero need a L2? Sean Coughlin presents Grease: a payment channel implementation for Monero | EPI 354

Jun 28, 2025

Sean Coughlin, a cryptographic engineer, dives into his innovative layer 2 payment channel protocol for Monero called Grease. He compares it to Bitcoin's Lightning Network, highlighting its potential to simplify off-chain payments. The conversation covers Monero's resilience against attack vectors and aligns Grease with future upgrades like Full Chain Membership Proofs. Sean discusses the importance of user-friendly transactions and wallet integration, aiming to enhance usability while maintaining Monero's privacy ethos.

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INSIGHT

Monero's Resilience To Attacks

Despite extensive research and attempts, Monero's privacy features remain robust against chain-analysis attacks.
All known theoretical attacks have been addressed or mitigated over years of development.

INSIGHT

Zero-Knowledge Proofs In Monero

Zero-knowledge proofs are fundamental to cryptography, including Monero's technology stack.
Monero uses bulletproofs, a form of zero-knowledge proof fit for its privacy goals but not fully Turing complete.

INSIGHT

Layer Two Payment Channels For Monero

Monero can benefit from payment channels (layer two solutions) without compromising its privacy or base layer.
Advances in zero-knowledge proofs and interoperability allow payment channels without complex routing or central hubs.

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TODAY'S SHOW: In this episode of Monero Talk, Douglas Tuman speaks with cryptographic engineer Sean Coughlin about "Grease," his proposed layer 2 payment channel protocol for Monero.

They delve into its technical design, how it compares to Bitcoin’s Lightning Network, and its potential to streamline Monero transactions by enabling off-chain payments without routing complexities. Sean shares insights from MoneroKon, discusses Monero’s resilience despite theoretical attack vectors, and explains how Grease aligns with upcoming upgrades like Full Chain Membership Proofs (FCMP++). He also touches on real-world use cases, wallet integration, and Grease’s flexible, decentralized approach aimed at boosting Monero’s usability and innovation.

TIMESTAMPS:
(00:03:40) Sean's background and involvement in Monero development
(00:06:29) Privacy strength of Monero and resistance to chain analysis
(00:10:21) Comparisons to other privacy coins (e.g., Zcash)
(00:12:26) MoneroKon research papers and Eclipse attacks on nodes.
(00:14:35) Discussion on Full Chain Membership Proofs (FCMP++) and its progress.
(00:18:37) Clarifying Zero-Knowledge Proofs and Monero's cryptographic foundation.
(00:22:11) History and capabilities of Turing-complete ZKPs in other projects.
(00:26:16) Philosophy of "minimaxing" – Monero focuses only on privacy.
(00:27:19) Debating if Monero needs to become Turing complete.
(00:31:05) Introduction to "Grease" – Monero-compatible payment channel proposal.
(00:31:42) Technical hurdles for payment channels in Monero (e.g., no transaction chaining).
(00:35:01) Feasibility of Grease today vs. post-FCMP++.
(00:36:38) Clarifying the benefits and use cases of Grease (instant payments, off-chain privacy).
(00:39:39) Why Layer 2 doesn’t conflict with Monero’s scaling philosophy.
(00:46:41) Grease vs. Bitcoin Lightning Network
(00:56:05) Feedback from MoneroKon and Reddit – cautious optimism from developers.
(01:05:39) Trade-offs: centralization vs. security in protocol design

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