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Danny Ryan
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# Ethereum 2.0 Implementers Call 18 Notes
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### Meeting Date/Time: Thursday 2019/5/23 at [14:00 GMT](https://savvytime.com/converter/gmt-to-germany-berlin-united-kingdom-london-ny-new-york-city-ca-san-francisco-china-shanghai-japan-tokyo-australia-sydney/mar-28-2019/2pm)
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### Meeting Duration: 1.5 hours
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### [GitHub Agenda Page](https://github.com/ethereum/eth2.0-pm/issues/43)
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### [Audio/Video of the meeting](https://www.youtube.com/watch?v=dw2GmEuLr5k&)
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# 1. [Testing Updates](https://youtu.be/dw2GmEuLr5k?t=417)
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* Protolambda
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* Slow week with NY blockchain week, helpful to get together with implementers
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* Epoch transistions, sanity tests, want clients to create test runners and get feedback
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* Tests are currently on separate branch, soon to be released
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* Mikhail
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* keccak256 still used in BLS test vectors
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* Danny - this was likely a mistake,
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* Protolambda
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* Loading configuration files: compile-time vs runtime
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* Mamy
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* Nimbus discussed this at length - for now using compile-time constants, not through YAML
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* Reconsidering in future for users, don't want them have to recompile everytime
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* Paul
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* Our approach has been to make our types generic across different size array lengths, so we're specifying sets of layouts so it's a mix
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* Danny
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* Configurable constants validity condition accompanies this, currently enumerating those in a branch
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* Constants will likely live in a test repo for now
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* Antoine
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* Testing jenkins instance for building docker files for Lighthouse, Prysm, Artemis for nodes on a simulated testnet
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* Working without discovery, just for connection. Next step is peer and sync
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* Format build by Whiteblock - network delays, easy to recreate real world simulations
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* Danny
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* Another initial fuzzing test targeting Go and Py specs, overtime will integrate more clients
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# 2. [Client Updates](https://youtu.be/dw2GmEuLr5k?t=1117)
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* Parity - Wei Tang
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* Up to date with 0.6 spec
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* Basic validator implementation running - one potential issue with BLS implementation: some rare cases where library is deemed invalid
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* Harmony - Mikahil
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* Finished 0.6 spec, passing all current tests, need to check out issues with BLS
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* Almost finished work on networking stack (wire proctocol, sync online mode, CLI interface for nodes)
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* Nodes falling apart after running several hours - mostly related to consensus
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* Too difficult to store public keys and compress them each time
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* Pegasys - Jonny
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* Lot of planning for interop lockin
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* Implementation of watching validators register; Timing mechanism is now swappable for testing different ones
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* Nimbus - Mamy
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* Slow weeks - several people on holiday
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* Networking, forward and backward sync
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* Still working on libp2p
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* Some confusion between keccak256 and SHA256
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* Shuffling and BLS mainnet tests passing
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* Update on ETH 1: new member working networking and reusable parts for ETH 2.0
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* Documentation generator for repo - should be cross language compatible
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* Also working on multi-threading and debugging Nim library
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* Prysmatic - Terence
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* Finished up to 0.6 spec, working on how to use and optimize in testnet
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* Updating SSZ and trie hashing
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* Investigating BLS alternatives
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* Possible colaboration with Whiteblock for p2p
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* Lodestar - Cayman
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* SSZ and BLS (switched to Milagro) tests passing for 0.6, soon state transtition tests and shuffling
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* Landed first version of gossipsub, reviewed by libp2p team - haven't integrated yet
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* Working on simulations running end to end
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* Collaborating with Yeeth team to convert Lodestar components to WASM
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* Lighthouse - Luke
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* Almost up to date with 0.6
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* Implemented parses of EF tests, added some provisions for future fuzzing - passing majority of tests
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* Progress with Discovery V5, inital implementation with Rust libp2p
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* Refactored database wrapper for optimizing for state storage and will be fuzzing more components
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* Trinity - Hsiao-Wei
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* Working on beach chain validator functionality, adding block sinking process on devp2p
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* Progress on Discovery V5 - implemented encryption-decryption functions from spec
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* Updating deposit contract
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# 3. [Research Updates](https://youtu.be/dw2GmEuLr5k?t=2083)
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* Vitalik
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* [V2 of Phase 2 proposal](https://notes.ethereum.org/w1Pn2iMmSTqCmVUTGV4T5A?viewPhase#)
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* Instead of maintaining large array of state for every shard, 32 byte hash takes that place
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* Full state can be abstracted across different execution environments
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* Despite more abstraction it's simpler based on how it lets you abstract things - ex: no need for 1 standard rent scheme - allows for
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alot more experimentation and design flexibility
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* Happens to provide a nice slot for ETH 1.0
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* Knowns and Unknowns:
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* Known - fundamentally possible to fulfill vision - complexity doesn't seem to increase with 2 layers over 1
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* Unknown - efficiency benefits from 1 type of committee over 2 types
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* Unknown - challenges in fragmentation over different environments - harder or easier to upgrade? - Censorship attacks
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* Unknown - 2 layer structure economic design for fee markets
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* Discussion of [SSZ partial for light clients](https://youtu.be/dw2GmEuLr5k?t=2883)
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* Olivier (Pegasys)
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* Finishing Handle paper (scalable BFT network aggregation protocol) - discovered and corrected some attack vectors
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* Working on blog post series on PCP
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# 4. [Network](https://youtu.be/dw2GmEuLr5k?t=3509)
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* Zak
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* Finished intial test series on gossipsub - will share data and results shortly
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* Started Discovery V5 and writing light client
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* Mike - Libp2p
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* Putting a lot more effort into specs since it's a big barrier for implementers
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* Zak
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* We're going to want a more solidified spec for libp2p for future implementers and we also need numbers for message sizes (avg, max)
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for adequate pre-production testing
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# 5. [interop lockin](https://youtu.be/dw2GmEuLr5k?t=3955)
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**Joseph:** Ongoing discussion over interop concerning: Why not libp2p first? Why minimum wire protocol for interop?
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**Jonny:** HackMD document attempting to outline with interop might look like with clients talking to eachother over libp2p. Mostly to simplify things
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and attempt to establish a baseline for node communication
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**Adrian:** if strip out higher level protcols of libp2p we're mostly working with TCP transport and multistream. Why can't we use basic
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libp2p with this functionality?
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**Zak:** that should work, we just need everyone to interpret messages the same way for consistent execution.
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**Mikerah:** [minimal libp2p implementation doc](https://github.com/ethresearch/p2p/issues/4) available for reference
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**Adrian:** libp2p should already be interoperable (Rust, Go, Javascript) off the shelf
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**Felix:** spec for frame format that multistream uses?
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**Adrian:** yes
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**Felix:** is there a way to remove the multistream for testing purposes?
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**Paul:** could they not just bind into the daemon?
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**Mike:** yeah, we built the daemon version of libp2p specifically for languages without libp2p implementation would be able to interop
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**Zak:** do we want to benchmark libp2p against devp2p? Right now we're testing gossipsub, floodsub, and plumbtree across both
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**Kevin:** I don't think the bindings are the most complicated part. The troublesome part is additional features like peers connecting
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**Zak:** another issue people have had is peers added to the routing table without any routeable IP address in libp2p. DiscoveryV5 should
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account for that
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**Felix:** we should have an evolving spec for the lower protocol and not just point people to libp2p
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**Mike:** we've actually been trying to specify what a libp2p 1.0 looks like implmented so perhaps we can contribute
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# Attendees
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* Danny Ryan (EF/Research)
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* Adrian Manning (Lighthouse/Sigma Prime)
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* Alex Stokes (Lighthouse/Sigma Prime)
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* Antoine Toulme (ConsenSys)
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* Ben Edginton (PegaSys)
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* Brett Robertson (Cat Herders)
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* Carl Beekhuizen (EF/Research)
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* Cayman
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* Chih-Cheng Liang (EF/Research)
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* Daniel Ellison (ConsenSys)
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* Daniel
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* Felix Lange (fjl) (EF/geth)
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* Greg Markou (ChainSafe)
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* Hsiao-Wei Wang (EF/Research)
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* Kevin Mai-Hsuan (EF/Research)
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* Jacek Sieka (Status/Nimbus)
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* Jannik Luhn (Brainbot/Research)
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* Jonny Rhea (Pegasys)
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* Joseph Delong (PegaSys)
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* Leo (BSC)
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* Luke Anderson (Lighthouse/Sigma Prime)
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* Mamy Ratsimbazafy (Nimbus/Status)
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* Matt Garnett
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* Matthew Slipper (Kyokan)
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* Mike Goelzer (libp2p)
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* Mikerah (ChainSafe)
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* Mikhail Kalinan (Harmony)
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* Nicolas Gailly (PegaSys)
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* Nishant Das (Prysmatic)
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* Olivier Begassat (ConsenSys)
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* Paul Hauner (Lighthouse/Sigma Prime)
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* Preston (Prysmatic)
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* Protolambda (EF)
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* Steven Schroeder (PegaSys)
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* Terence Tsao (Prymatic)
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* Trenton Van Epps (Ethereum Cat Herders)
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* Weather Cam?
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* Wei Tang (Parity)
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* Vitalik Buterin (EF/Research)
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* Zak Cole (Whiteblock)
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* Meeting notes: Michael LaCroix
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