sub0 Asia 2024 - Bhargav Bhatt (Web3 Foundation)
summary
Polkadot Ethereum Bridge runs an Ethereum light client as a parachain and a BEEFY-based Polkadot light client as an Ethereum smart contract, replacing trusted relayers with Polkadot Ethereum Bridge light clients. Cost drops by sampling M validator signatures instead of verifying 2f+1; baseline has ~200+ sigs, sampling picks ~20–25 but adds ~10 extra checks to counter Rand bias from Ethereum sync committees. A dynamic sampling rule raises M logarithmically under heavy relay concurrency; analysis assumes 2/3 honesty, 50% slashing, and shows probabilistic security with multi-fold gas savings.
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chapters (14)
- 0:00Polkadot-Ethereum bridge intro
- 1:50Traditional bridge vulnerabilities
- 4:01Trustless bridge requirements
- 5:26Light client for interoperability
- 7:32Ethereum listening challenges
- 8:14Finality verification protocol
- 10:00Random sampling protocol
- 12:32Security analysis
- 14:45Interactive protocol details
- 15:50Ethereum randomness bias
- 18:18Validator attacks and concurrency
- 20:28Dynamic sampling mitigation
- 21:51Security parameters and efficiency
- 23:17Conclusion and Q&A
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